Journal articles: 'Joints loads'

1

Özes, Çiçek, and Özgen Aydin. "Analysis of Sandwich T-Joints under Compression Loads in Marine Applications." Advanced Composites Letters 18, no. 3 (May 2009): 096369350901800. http://dx.doi.org/10.1177/096369350901800301.

Full text

Abstract:

This paper deals with the analysis of sandwich T-joints in terms of buckling loads, which are used in marine applications. Buckling loads have been investigated experimentally and numerically. Loading is applied as uniform axial compression. The GRP/PVC sandwich composite T- joints have been manufactured in six different geometries. Numerical and experimental results both show that the geometry of the T-joint area affects the buckling loads. It has been observed that failure mode is the same in all of the joint types, which is core shear. Stress distributions in T-joints have also been investigated under buckling loads and also for a constant compression load. It is seen that T-joint geometry has an effect on stress distributions obtained under buckling loads.

APA, Harvard, Vancouver, ISO, and other styles

2

Zhuang, Fujian, and Puhui Chen. "Effects of missing fasteners on the mechanical behavior of double-lap, multi-row composite bolted joints." Journal of Composite Materials 52, no. 28 (May 2, 2018): 3919–33. http://dx.doi.org/10.1177/0021998318771464.

Full text

Abstract:

This paper presents a numerical investigation into the effects of missing fasteners on the mechanical characteristics of double-lap, multi-row composite bolted joints. A highly efficient explicit finite element model, which was validated effective and accurate by experiments, was developed and employed to conduct the virtual tests. Single-column and multi-column joints with various positions of missing fastener were considered. It is shown that the removal of fasteners can reduce the joint stiffness significantly, especially in joints with fewer columns or missing fasteners in the outside rows. The removal of fasteners can also cause considerable reductions in both the initial significant failure loads and ultimate loads of multi-column joints, while in single-column joints only the initial significant failure loads are influenced. Considering the load distribution, it is suggested that bolts in the same column as or in the adjacent column to the missing fastener experience a notable growth in load. Meanwhile, if a bolt bears more loads in the pristine joint, the larger changes in stiffness, ultimate strength, and load distribution may be obtained when it is lost.

APA, Harvard, Vancouver, ISO, and other styles

3

Ma, Yan Yan, Kai Fu Zhang, Zhao Jun Yang, and Yuan Li. "Effects of Impact on the Failure of CFRP/Al Bonded Single-Lap Joints with Different Overlap Length." Advanced Materials Research 181-182 (January 2011): 814–19. http://dx.doi.org/10.4028/www.scientific.net/amr.181-182.814.

Full text

Abstract:

A parametric study on CFRP/Al adhesively bonded single lap joints was experimentally conducted. The primary objective of this study is to investigate the effects of overlap length and impact loads on the failure mode and failure load of joints. Experimental results show that structural failure of joints occurred in the adhesive layer or the bonded interface; failure loads and impact resistance of the joint increased as the overlap length increased; the carrying load of joints which subjected to impact declined significantly because of internal damage of the adhesive layer.

APA, Harvard, Vancouver, ISO, and other styles

4

Ooi, E. P., R. Daud, N. A. M. Amin, and T. W. Hong. "Recent Development on Fracture Analysis of Solder Joints." Applied Mechanics and Materials 695 (November 2014): 680–83. http://dx.doi.org/10.4028/www.scientific.net/amm.695.680.

Full text

Abstract:

Solder joints failure due to thermal loads and mechanical loads is a significant reliability concern in electronic devices. From literatures, little attention is paid to the development of methods on predicting fracture behavior of solder joint under mixed-mode loading. In reality, the solder joints are exposed to drop impact, vibration loading, bending, and twisting of PCBs. Study on this matter will lead to prediction of fracture load, prevalent fracture mode, exact joint interconnect size and life of joints under brittle and fatigue failure. This paper presents a review of recent fracture analysis on solder joints.

APA, Harvard, Vancouver, ISO, and other styles

5

Kang, Heesuk, Paul Park, Frank La Marca, Scott J. Hollister, and Chia-Ying Lin. "Analysis of load sharing on uncovertebral and facet joints at the C5–6 level with implantation of the Bryan, Prestige LP, or ProDisc-C cervical disc prosthesis: an in vivo image-based finite element study." Neurosurgical Focus 28, no. 6 (June 2010): E9. http://dx.doi.org/10.3171/2010.3.focus1046.

Full text

Abstract:

Object The goal of this study was to evaluate and compare load sharing of the facet and uncovertebral joints after total cervical disc arthroplasty using 3 different implant designs. Methods Three-dimensional voxel finite element models were built for the C5–6 spine unit based on CT images acquired from a candidate patient for cervical disc arthroplasty. Models of facet and uncovertebral joints were added and artificial discs were placed in the intervertebral disc space. Finite element analyses were conducted under normal physiological loads for flexion, extension, and lateral bending to evaluate von Mises stresses and strain energy density (SED) levels at the joints. Results The Bryan disc imposed the greatest average stress and SED levels at facet and uncovertebral joints with flexion-extension and lateral bending, while the ProDisc-C and Prestige LP discs transferred less load due to their rigid cores. However, all artificial discs showed increased loads at the joints in lateral bending, which may be attributed to direct impinging contact force. Conclusions In unconstrained/semiconstrained prostheses with different core rigidity, the shared loads at the joints differ, and greater flexibility may result in greater joint loads. With respect to the 3 artificial discs studied, load sharing of the Bryan disc was highest and was closest to normal load sharing with the facet and uncovertebral joints. The Prestige LP and ProDisc-C carried more load through their rigid core, resulting in decreased load transmission to the facet and uncovertebral joints.

APA, Harvard, Vancouver, ISO, and other styles

6

Truong Viet, Hoai, Tran Duc Hoan, Vu Minh Vinh, and Chu Van Huy. "Failure load prediction of single-lap bonded joints by damage zone method." Journal of Military Science and Technology, no. 79 (May 19, 2022): 52–59. http://dx.doi.org/10.54939/1859-1043.j.mst.79.2022.52-59.

Full text

Abstract:

The failure load of single-lap bonded joints with dissimilar adherend materials was predicted using the damage zone method. A number of six joint configurations with different thicknesses of the adherends were considered. Three-dimensional finite element models were built to represent the behavior of the bonded joints, and the damage zone method was applied to predict the failure loads of the joints. The predictions of failure loads of the joints were achieved, showing a good agreement between the numerical and the corresponding experimental results.

APA, Harvard, Vancouver, ISO, and other styles

7

Gao, Deng Li, Zhen Bao Li, Guo Feng Wang, and Jian Cheng Li. "The Experimental Investigation of Slab Participation in Flexural Behavior of Beams under Two-Way Loading." Applied Mechanics and Materials 105-107 (September 2011): 969–75. http://dx.doi.org/10.4028/www.scientific.net/amm.105-107.969.

Full text

Abstract:

The paper designed three joints namely beam-column joint of reinforced concrete frame without slab and two beam-column joints of reinforced concrete frame with slab, using different loading methods (one direction and two directions) to experiment. The paper studied failure behavior, load-carrying capacity, and slab participation in flexural behavior of beam under different loading modes. Experiment shows that for the joints with slab, flexural capacity at end of the beam under two direction loads than one direction loads lows by about 10%; under one direction load, effective flange width of slab should be taken 8 times thickness, under two direction loads, effective flange width of slab should be taken 10 times thickness.

APA, Harvard, Vancouver, ISO, and other styles

8

Kipp, Kristof, Josh Redden, Michelle Sabick, and Chad Harris. "Kinematic and Kinetic Synergies of the Lower Extremities During the Pull in Olympic Weightlifting." Journal of Applied Biomechanics 28, no. 3 (July 2012): 271–78. http://dx.doi.org/10.1123/jab.28.3.271.

Full text

Abstract:

The purpose of this study was to identify multijoint lower extremity kinematic and kinetic synergies in weight-lifting and compare these synergies between joints and across different external loads. Subjects completed sets of the clean exercise at loads equal to 65, 75, and 85% of their estimated 1-RM. Functional data analysis was used to extract principal component functions (PCF’s) for hip, knee, and ankle joint angles and moments of force during the pull phase of the clean at all loads. The PCF scores were then compared between joints and across loads to determine how much of each PCF was present at each joint and how it differed across loads. The analyses extracted two kinematic and four kinetic PCF’s. The statistical comparisons indicated that all kinematic and two of the four kinetic PCF’s did not differ across load, but scaled according to joint function. The PCF’s captured a set of joint- and load-specific synergies that quantified biomechanical function of the lower extremity during Olympic weightlifting and revealed important technical characteristics that should be considered in sports training and future research.

APA, Harvard, Vancouver, ISO, and other styles

9

Su, Yi Sheng, Shu Fang Zheng, Qi Liang Li, and Jin Yun Quan. "Experimental Study on the Static Performance of Joints in the Castellated Portal Frame of Light-Weight Steel." Applied Mechanics and Materials 166-169 (May 2012): 563–68. http://dx.doi.org/10.4028/www.scientific.net/amm.166-169.563.

Full text

Abstract:

In order to study the mechanical behavior of joints in the castellated portal frame of light-weight steel under static loads, a static loads experiment has been performed for these new joints in this paper. The experiment members include four castellated joints and one solid-web joint of original steel, considering three vary parameters which are connection form of joints, joint region with setting stiffener and the distance from the center of hole to joint region. Experiment shows: the stiffness of castellated joints is higher than the one of solid-web joint. The parameters have a great influence on the mechanical behavior of joints, except the connection form of joints.

APA, Harvard, Vancouver, ISO, and other styles

10

Huang, Zhen, Jiawei Zhang, Zimao Peng, Hongbo Hu, Huiping An, Xulong Yang, and Tianxiang Xiong. "Simulation of Thermomechanical Coupling and Evaluation of the Fire Resistance for the Joints of Fabricated Frame Tunnel." Fire 6, no. 1 (December 21, 2022): 3. http://dx.doi.org/10.3390/fire6010003.

Full text

Abstract:

Fire in a tunnel will deteriorate the mechanical properties of the tunnel. For fabricated tunnels formed by splicing prefabricated components through joints, under the high temperature of a fire, the rapid degradation of the bearing capacity of the joints can easily lead to tunnel damage. In this study, a new type of joint (bolt-pin joints (BPJ)) for prefabricated frame tunnels is proposed. To investigate the fire resistance of the new joint and the other three fabricated frame tunnel joints (including mortise joints (MJ), bolt-mortise joints (BMJ), and pin joints (PJ)), a three-dimensional solid model of four types of fabricated frame tunnel joints is established using the finite element calculation software ABAQUS. According to the standard European HC curve, the heat transfer characteristics of the joint model are analyzed, the temperature distribution law of the joint under fire is studied, and the flexural bearing performance and deformation characteristics of the joint before and after the fire are discussed, as well as the influence of the initial axial force on the flexural bearing capacity and the opening of the joint under fire. The analysis result shows that the vertical peak load of the BPJ is higher than that of the other three joints at room temperature. Under the combined action of the pin and bolts and the tongue groove, the vertical peak load of the joints can be effectively increased and the midspan vertical displacement can be reduced. The decrease degree of the vertical peak load of the MJ and BMJ under fire exposure is greater than that of the other two joints, and the opening of the BPJ is 19 mm, which is much smaller than that of the other three joints. When the initial axial force is increased, the openings of the four joints under fire exposure are reduced, the vertical peak loads of the PJ and BPJ are increased, and the vertical peak loads of the MJ and BMJ are not significantly increased. Overall, the BPJ demonstrates better fire resistance.

APA, Harvard, Vancouver, ISO, and other styles

11

Chen, Yu Li, Kang Kang Wang, and Xiao Xiao Zhang. "Effect of Load Direction on Failure of Out-of-Plane Composite Joints." Advanced Materials Research 1095 (March 2015): 934–37. http://dx.doi.org/10.4028/www.scientific.net/amr.1095.934.

Full text

Abstract:

The mechanical properties of fabric composite π joints under stretch-bending load are studied using the progressive damage method. The failure mode of fillers is evaluated by the modified maximum stress failure criterion due to their structural particularity, while other parts of the joint by the maximum stress failure criterion. Compared with the results of joints under simple tensile load, the numerical simulation result of the joint under stretch-bending loads with varied directions reveals that the flexion can cause significant reduction in the initial and ultimate failure strength although it has little effect on the structure stiffness before initial failure. In addition, the base laminate and the skin are more easily damaged under stretch-bending loads.

APA, Harvard, Vancouver, ISO, and other styles

12

Chen, Gongfa, Zhuangcheng Fang, Shaodi Wang, Haibo Jiang, and Hualian Liang. "Numerical Analysis on Shear Behavior of Joints under Low Confining and Eccentric Loads." Advances in Civil Engineering 2019 (April 30, 2019): 1–16. http://dx.doi.org/10.1155/2019/4589824.

Full text

Abstract:

The joints of precast concrete segmental beams (PCSBs), which are in complex stress status and susceptible to failure, are very important parts of the structure. In this paper, a finite element model was established to study the shear performance of single-keyed joints. The plastic damage model was used to simulate the cracking of specimens. Three types of single-keyed joints were investigated, including the dry joint with normal concrete (NC), dry joint with steel fiber-reinforced concrete (SFRC), and epoxied joint with NC. The cracking pattern, ultimate shear strength, and load-displacement curve for these specimens were obtained. Based on these numerical simulation models, extended analyses in terms of low confining pressures and eccentric loads were performed. It has been found that the influence of fiber-reinforced concrete should be considered. The ultimate shear strength of specimens reduced with the reduction of confining pressure. When an eccentric load was applied, a lower shear capacity would be obtained. Under the low confining stress, the AASHTO LRFD 2014 provision underestimated the shear strength of single-keyed dry joints with both NC and SFRC, while the shear capacity of single-keyed dry joints with both NC and SFRC has been overestimated under the eccentric loads.

APA, Harvard, Vancouver, ISO, and other styles

13

Yousefi, Armin, Ahmad Serjouei, Reza Hedayati, and Mahdi Bodaghi. "Fatigue Modeling and Numerical Analysis of Re-Filling Probe Hole of Friction Stir Spot Welded Joints in Aluminum Alloys." Materials 14, no. 9 (April 23, 2021): 2171. http://dx.doi.org/10.3390/ma14092171.

Full text

Abstract:

In the present study, the fatigue behavior and tensile strength of A6061-T4 aluminum alloy, joined by friction stir spot welding (FSSW), are numerically investigated. The 3D finite element model (FEM) is used to analyze the FSSW joint by means of Abaqus software. The tensile strength is determined for FSSW joints with both a probe hole and a refilled probe hole. In order to calculate the fatigue life of FSSW joints, the hysteresis loop is first determined, and then the plastic strain amplitude is calculated. Finally, by using the Coffin-Manson equation, fatigue life is predicted. The results were verified against available experimental data from other literature, and a good agreement was observed between the FEM results and experimental data. The results showed that the joint’s tensile strength without a probe hole (refilled hole) is higher than the joint with a probe hole. Therefore, re-filling the probe hole is an effective method for structures jointed by FSSW subjected to a static load. The fatigue strength of the joint with a re-filled probe hole was nearly the same as the structure with a probe hole at low applied loads. Additionally, at a high applied load, the fatigue strength of joints with a refilled probe hole was slightly lower than the joint with a probe hole.

APA, Harvard, Vancouver, ISO, and other styles

14

Grosse, I. R., and L. D. Mitchell. "Nonlinear Axial Stiffness Characteristics of Axisymmetric Bolted Joints." Journal of Mechanical Design 112, no. 3 (September 1, 1990): 442–49. http://dx.doi.org/10.1115/1.2912628.

Full text

Abstract:

A critical assessment of the current design theory for bolted joints which is based on a linear, one-dimensional stiffness analysis is presented. A detailed nonlinear finite element analysis of a bolted joint conforming to ANSI standards was performed. The finite element results revealed that the joint stiffness is highly dependent on the magnitude of the applied load. The joint stiffness changes continuously from extremely high for small applied loads to the bolt stiffness during large applied loads, contrary to the constant joint stiffness of the linear theory. The linear theory is shown to be inadequate in characterizing the joint stiffness. The significance of the results in terms of the failure of bolted joints is discussed. A number of sensitivity studies were carried out to assess the effect of various parameters on the axial joint stiffness. The results revealed that bending and rotation of the joint members, interfacial friction, and the bolt/nut threading significantly influence the axial stiffness characteristics of the bolted joint. The two-dimensional, axisymmetric finite element model includes bilinear gap elements to model the interfaces. Special orthotropic elements were used to model the bolt/nut thread interaction. A free-body-diagram approach was taken by applying loads to the outer diameter of the joint model which correspond to internal, uniformly distributed line-shear and line-moment loads in the joint. A number of convergence studies were performed to validate the solution.

APA, Harvard, Vancouver, ISO, and other styles

15

Karduna, A. R., G. R. Williams, J. P. Iannotti, and J. L. Williams. "Total Shoulder Arthroplasty Biomechanics: A Study of the Forces and Strains at the Glenoid Component." Journal of Biomechanical Engineering 120, no. 1 (February 1, 1998): 92–99. http://dx.doi.org/10.1115/1.2834312.

Full text

Abstract:

The objective of this study was to examine how changes in glenohumeral joint conformity and loading patterns affected the forces and strains developed at the glenoid. After removal of soft tissue (muscles, ligaments, and labrum), force-displacement data were collected for both natural and prosthetically reconstructed joints. Joints were shown to develop higher forces for a given translation as joint conformity increased. A rigid body model of joint contact forces was used to determined the so-called effective radial mismatch of each joint. For the purposes of this study, the effective radial mismatch is defined as the mismatch required for a rigid body joint to have the same force-displacement relationship as the joint in question. This parameter is an indication of the deformation at the articular surface. The effective radial mismatch dramatically increased with increasing medial loads, indicating that under physiological loads, the effective radial mismatch of a joint is much greater than its measured mismatch at no load. This increase in effective mismatch as medial loads were increased was found to be threefold greater in cartilaginous joints than in reconstructed joints. Rosette strain gages positioned at the midlevel of the glenoid keel in the reconstructed joints revealed that anterior/posterior component loading leads to fully reversible cyclic keel strains. The highest compressive strains occurred with the head centered in the glenoid, and were larger for nonconforming joints (ε = 0.23 percent). These strains became tensile just before rim loading and were greater for conforming joints (ε = 0.15 percent). Although recorded peak strains are below the yield point for polyethylene, the fully reversed cyclic loading of the component in this fashion may ultimately lead to component toggling and implant failure.

APA, Harvard, Vancouver, ISO, and other styles

16

Malhotra, S. K., and B. Thomas. "Effect of interface gap on load–slip characteristics of timber joints fabricated with multiple nails." Canadian Journal of Civil Engineering 12, no. 1 (March 1, 1985): 104–13. http://dx.doi.org/10.1139/l85-011.

Full text

Abstract:

An experimental program, exploratory in nature, has been carried out to investigate the effect of interface gap on the load–slip behaviour of joints fabricated with multiple nails. In total, 320 joint specimens have been tested. Modification factors are developed to account for the effects of number of nails and interface gap on the overall load-carrying capacity of joints with multiple nails. The current practice for the design of nailed joints is that a joint fastened together with multiple nails in a row, regardless of the interface characteristics of that joint, carries lateral load equal to the product of the lateral-load capacity of the corresponding joint with a single nail and the number of nails in a row of the joint. The findings of this investigation indicate this practice to be somewhat of an overestimation of the overall capacity of the joint. Key words: design, interface gap, interface friction, joint slip, loads (forces), modification factors, multiple fasteners, nailed joints, stiffness, structural engineering, tests, timber construction.

APA, Harvard, Vancouver, ISO, and other styles

17

Padmanabhan, K. K., and A. S. R. Murty. "Damping in Structural Joints Subjected to Tangential Loads." Proceedings of the Institution of Mechanical Engineers, Part C: Mechanical Engineering Science 205, no. 2 (March 1991): 121–29. http://dx.doi.org/10.1243/pime_proc_1991_205_099_02.

Full text

Abstract:

Metallic mating surfaces in machine joints offer an excellent source of energy dissipation, resulting in damped dynamic structural response, for example in machine tools. This paper describes the results of a series of experiments where the energy loss per cycle occurring at preloaded flat metallic interfaces subjected to cyclic tangential forces are measured. The effects of certain pertinent joint variables on the joint damping effectiveness are investigated. The results should be useful to the designers of machine tool structures, where damping occurring in joints is important.

APA, Harvard, Vancouver, ISO, and other styles

18

Molski, Krzysztof L. "Stress Concentration at Load-Carrying Fillet Welded Cruciform Joints Subjected to Tensile and Bending Loads." Acta Mechanica et Automatica 13, no. 4 (December 1, 2019): 245–50. http://dx.doi.org/10.2478/ama-2019-0033.

Full text

Abstract:

Abstract This article presents numerical finite element method (FEM) analysis of the stress concentration at toes and crack-like faults in load-carrying fillet welded cruciform joints with transversal slits resulting from non-fused root faces. Potential fatigue damage of such joints subjected to cyclic tensile and bending loads appears in the form of fatigue cracks starting from the weld roots or toes. The aim of this article is to find qualitative and quantitative relationships between geometrical parameters of the load-carrying fillet welded cruciform joint subjected to tensile and bending loads and the stress concentration at weld toes and roots. The results of the analysis represented by the stress concentration factors (SCFs) and the stress intensity factors KI and KII are shown in the form of tables, graphs and mathematical formulas, which may be applied for fatigue assessment of such joints.

APA, Harvard, Vancouver, ISO, and other styles

19

Verma, Amrit Shankar, Nils Petter Vedvik, Zhen Gao, Saullo G. P. Castro, and Julie J. E. Teuwen. "Bondline Thickness Effects on Damage Tolerance of Adhesive Joints Subjected to Localized Impact Damages: Application to Leading Edge of Wind Turbine Blades." Materials 14, no. 24 (December 8, 2021): 7526. http://dx.doi.org/10.3390/ma14247526.

Full text

Abstract:

The leading edges of wind turbine blades are adhesively bonded composite sections that are susceptible to impact loads during offshore installation. The impact loads can cause localized damages at the leading edges that necessitate damage tolerance assessment. However, owing to the complex material combinations together with varying bondline thicknesses along the leading edges, damage tolerance investigation of blades at full scale is challenging and costly. In the current paper, we design a coupon scale test procedure for investigating bondline thickness effects on damage tolerance of joints after being subjected to localized impact damages. Joints with bondline thicknesses (0.6 mm, 1.6 mm, and 2.6 mm) are subjected to varying level of impact energies (5 J, 10 J, and 15 J), and the dominant failure modes are identified together with analysis of impact kinematics. The damaged joints are further tested under tensile lap shear and their failure loads are compared to the intact values. The results show that for a given impact energy, the largest damage area was obtained for the thickest joint. In addition, the joints with the thinnest bondline thicknesses displayed the highest failure loads post impact, and therefore the greatest damage tolerance. For some of the thin joints, mechanical interlocking effects at the bondline interface increased the failure load of the joints by 20%. All in all, the coupon scale tests indicate no significant reduction in failure loads due to impact, hence contributing to the question of acceptable localized damage, i.e., damage tolerance with respect to static strength of the whole blade.

APA, Harvard, Vancouver, ISO, and other styles

20

Sathish Kumar, Veerappan, Namasivayam Ganesan, Pookattu Vattarambath Indira, Gunasekaran Murali, and Nikolai Ivanovich Vatin. "Behaviour of Hybrid Fibre-Reinforced Ternary Blend Geopolymer Concrete Beam-Column Joints under Reverse Cyclic Loading." Polymers 14, no. 11 (May 31, 2022): 2239. http://dx.doi.org/10.3390/polym14112239.

Full text

Abstract:

Beam–column joints are extremely vulnerable to lateral and vertical loads in reinforced concrete (RC) structures. This insufficiency in joint performance can lead to the failure of the whole structure in the event of unforeseen seismic and wind loads. This experimental work was conducted to study the behaviour of ternary blend geopolymer concrete (TGPC) beam-column joints with the addition of hybrid fibres, viz., steel and polypropylene fibres, under reverse cyclic loads. Nine RC beam-column joints were prepared and tested under reverse cyclic loading to recreate the conditions during an earthquake. M55 grade TGPC was designed and used in this present study. The primary parameters studied in this experimental investigation were the volume fractions of steel fibres (0.5% and 1.0%) and polypropylene fibres, viz., 0.1 to 0.25%, with an increment of 0.05%. In this study, the properties of hybrid fibre-reinforced ternary blend geopolymer concrete (HTGPC) beam-column joints, such as their ductility, energy absorption capacity, initial crack load and peak load carrying capacity, were investigated. The test results imply that the hybridisation of fibres effectively enhances the joint performance of TGPC. Also, an effort was made to compare the shear strength of HTGPC beam-column connections with existing equations from the literature. As the available models did not match the actual test results, a method was performed to obtain the shear strength of HTGPC beam-column connections. The developed equation was found to compare convincingly with the experimental test results.

APA, Harvard, Vancouver, ISO, and other styles

21

Martin, Heiner, Michael Stiehm, Ingmar Rinas, Niels Grabow, and Thomas Mittlmeier. "Testing of dynamic wrist joint external fixator mobility and reaction moment." Current Directions in Biomedical Engineering 4, no. 1 (September 1, 2018): 447–48. http://dx.doi.org/10.1515/cdbme-2018-0106.

Full text

Abstract:

AbstractFor the investigation of reaction moments of wrist joint with external fixator, a test device was developed that allows a well-defined investigation of the joint loads during hand flexion movements. The reaction moments are considered as a measure for the joint loads due to the constraint forces, which occur with differences of the rotation axis of the fixator device from the physiological rotation axis of the wrist joint. The developed test device allows a dynamic momentum load application into the wrist by a servohydraulic testing machine. This testing device converts the force to a moment by a constant lever arm and allows thereby the measurement of the reaction moments by the force load cell of the testing machine. Measurements on cadaveric wrist joints with external fixator can be thereby performed under reproducible conditions. The cadaveric wrist joints can be integrally casted into bone cement and thereby clamped to the testing device. Preliminary experiments with artificial bones showed that forces within the measuring range of the load cell of the testing machine can be measured. The design of the test device is presented. Hence, the requirements for measurements of the reaction moments with wrists with external fixator for distal radius fractures under dynamic loads are created.

APA, Harvard, Vancouver, ISO, and other styles

22

Abe, Yohei, Takato Saito, Ken-Ichiro Mori, and Toru Kato. "Mechanical clinching with dies for control of metal flow of ultra-high-strength steel and high-strength steel sheets." Proceedings of the Institution of Mechanical Engineers, Part B: Journal of Engineering Manufacture 232, no. 4 (February 1, 2017): 644–49. http://dx.doi.org/10.1177/0954405416683429.

Full text

Abstract:

Ultra-high-strength steel sheets having a tensile strength of more than 1 GPa and a low ductility were joined by mechanical clinching with dies for control of metal flow. The bottom angle of the die was modified to increase interlocking between the sheets under avoidance of the sheet fracture. The effect of the die shape on metal flow in the sheet combination including an ultra-high-strength steel sheet was investigated by the finite element simulation and the experiment. As the tensile strength of the steel sheets increased, the joining range was narrow due to low ductility of the sheets. The static and fatigue strengths of the mechanically clinched joints were compared with those of the welded joints. Although the static loads of the mechanically clinched joints were smaller than those of the resistance spot welded joints in both tension-shearing and cross-tension tests, the fatigue loads of the clinched joints were larger. It was found that the mechanically clinched joint has superior fatigue strength.

APA, Harvard, Vancouver, ISO, and other styles

23

Taotao, Zhang, Luo Wenbo, Xiao Wei, and Yan Ying. "Numerical simulation of single-lap adhesive joint of composite laminates." Journal of Reinforced Plastics and Composites 37, no. 8 (January 30, 2018): 520–32. http://dx.doi.org/10.1177/0731684418754358.

Full text

Abstract:

A universal method is established to research the various possible damage modes of adhesive bond of laminated composites with or without z-pin reinforcements under tensile loads through numerical simulation. A Continuum Damage Mechanic model based on Hashin damage criterion as a user-defined subroutine is developed to simulate the damage of laminates and Z-pins. The Cohesive Zone Model is used to simulate the damage of adhesive damage, interlayer delamination, and Z-pin slipping-out phenomenon. The numerical simulation method is validated for simulating the various damage modes of the usual composite joints through comparing the simulated results and experiments. The research shows that different ply sequences induce different damage modes and ultimate failure loads of composite joints. The ultimate failure load of joint under tension is not affected obviously whether the joints are reinforced with or without z-pins. The reason is that the damage initiation usually locates at the two sides of adhesive zone and z-pins do not react on the reinforcement under tensile load of joint.

APA, Harvard, Vancouver, ISO, and other styles

24

Tan, Yingliang, Bing Zhu, Tingyi Yan, Biao Huang, Xuewei Wang, Wenwei Yang, and Bo Huang. "Experimental Study of the Mechanical Behavior of the Steel–Concrete Joints in a Composite Truss Bridge." Applied Sciences 9, no. 5 (February 27, 2019): 854. http://dx.doi.org/10.3390/app9050854.

Full text

Abstract:

The mechanical behavior of the steel–concrete joints in a composite bridge was investigated. Pull-out tests on eight specimens were carried out to evaluate the connection performance of Perfobond rib shear connectors (PBL shear connectors). In addition, static load tests were conducted on three composite joint specimens with a scale of 1/2 in a composite truss bridge. The crack load, load–displacement curves, strain distribution, and the joint stiffness were obtained from the composite joint to analyze the mechanical behavior of steel–concrete joints. The experimental results show that the embedded depth plays an important role in the ultimate bearing capacity and the deformation of PBL shear connectors and could even change the failure mode. Based on the test results of composite joints, the displacement increased almost linearly with the horizontal load on the concrete chord. There was no evident failure, and large deformation occurred in composite joints. In addition, the ultimate loads obtained from three composite joint specimens were greater than 2.93 times the design load (2050 kN). These investigated composite joints had excellent bearing capacity (above 6000 kN). This study will provide an experimental reference for the design of steel–concrete joints for composite truss bridges.

APA, Harvard, Vancouver, ISO, and other styles

25

Zheng, Wenzhong, Dehong Wang, and Yanzhong Ju. "Performance of Reinforced Reactive Powder Concrete Beam-Column Joints under Cyclic Loads." Advances in Civil Engineering 2018 (2018): 1–12. http://dx.doi.org/10.1155/2018/3914815.

Full text

Abstract:

An experimental research was carried out to investigate the seismic performance and shear strength of reactive powder concrete interior beam-column joints subjected to reverse cyclic loads. Four beam-column joint specimens were cast and tested in the investigation. The failure characteristics, deformational properties, ductility, and energy dissipation of reinforced reactive powder concrete interior beam-column joints were analyzed in this paper. The shear strength of joints was calculated according to the GB5001-2010 and ACI 318-14. The results shows that reactive powder concrete beam-column joints have a higher shear-cracking strength and shear carrying capacity and strength degradation and rigidity degradation are not notable. Additionally, the use of RPC for beam-column joints can reduce the congestion of stirrups in joints core. The shear force in the RPC joint is mainly carried by the diagonal strut mechanism; the design expression of ACI 318-14 can be used for calculating the shear strength of RPC joints, which has a safety margin of 22%∼38% in this test.

APA, Harvard, Vancouver, ISO, and other styles

26

Newnham, J., and L. Curley. "Bolted Joints Under Tensile Service Loads: The Effect of Torsion in the Bolt on In-Service Clamping Loads." Journal of Mechanical Design 115, no. 1 (March 1, 1993): 36–40. http://dx.doi.org/10.1115/1.2919321.

Full text

Abstract:

In order to determine how bolted joints behave under conditions of tensile external loading, tests were conducted on bolts which had been tightened into joints by means of (a) elastic range, (b) yield, and (c) over-yielding tightening. The loading tests showed that the maximum clamp load which the bolt would exert on the joint without permanent extension was the uniaxial tensile yield load of the bolt. This was observed even when torsional stress was present in the as-tightened bolt, and for all three tightening methods.

APA, Harvard, Vancouver, ISO, and other styles

27

Chapman, Ian, John Newnham, and Paul Wallace. "The Tightening of Bolts to Yield and Their Performance Under Load." Journal of Vibration and Acoustics 108, no. 2 (April 1, 1986): 213–21. http://dx.doi.org/10.1115/1.3269326.

Full text

Abstract:

The mechanism of tightening bolted joints and the stress distribution in the bolt are analyzed. Measurements were made of static and dynamic strength of joints. It is shown that all bolts behave elastically when external loads are applied to the joint even when the fastener was tightened to its torque-tension yield point. It is shown that joints generally fail when the external loads are sufficient to overcome the bolt preload. Fatigue reesults show that joint fatigue strength increases with preload, and that high fatigue bolts gave an improvement over standard fasteners at all preloads.

APA, Harvard, Vancouver, ISO, and other styles

28

Tiwary, Aditya Kumar, Sandeep Singh, Jasgurpreet Singh Chohan, Raman Kumar, Shubham Sharma, Somnath Chattopadhyaya, Farid Abed, and Mislav Stepinac. "Behavior of RC Beam–Column Joints Strengthened with Modified Reinforcement Techniques." Sustainability 14, no. 3 (February 8, 2022): 1918. http://dx.doi.org/10.3390/su14031918.

Full text

Abstract:

Using a significant number of transverse hoops in the joint’s core is one recognized way for achieving the requirements of strength, stiffness, and ductility under dynamic loading in a column joint. The shear capacity of a joint is influenced by the concrete’s compressive strength, the anchoring of longitudinal beam reinforcement, the number of stirrups in the joint, and the junction’s aspect ratio. Seismic motion on the beam may produce shear capacity and bond breaking in the joint, causing the joint to fracture. Furthermore, due to inadequate joint design and details, the entire structure is jeopardized. In this study, the specimens were divided into two groups for corner and interior beam–column joints based on the joint reinforcement detailing. The controlled specimen has joint detailing as per IS 456:2000, and the strengthened specimen has additional diagonal cross bars (modified reinforcement technique) at the joints detailed as per IS 456:200. The displacement time history curve, load-displacement response curves, load-displacement hysteretic curve, and load cycle vs. shear stress were used to compare the results of the controlled and strengthened specimens. The findings show that adding diagonal cross bars (modified reinforcing techniques) to beam–column joints exposed to cyclic loads enhances their performance. The inclusion of a diagonal cross bar increased the stiffness of the joint by giving an additional mechanism for shear transfer and ductility, as well as greater strength with minimum cracks.

APA, Harvard, Vancouver, ISO, and other styles

29

Koves, W. J. "Analysis of Flange Joints Under External Loads." Journal of Pressure Vessel Technology 118, no. 1 (February 1, 1996): 59–63. http://dx.doi.org/10.1115/1.2842164.

Full text

Abstract:

Flange joint leakage is one of the common maintenance problems in refineries and chemical plants. This paper studies the effect of external loads on the strength and leakage behavior of flanged joints. Finite element and analytical methods are compared, and the proposed method is compared with leakage data. The common “equivalent pressure” method is shown to be very conservative, and a method of evaluating external loads is recommended.

APA, Harvard, Vancouver, ISO, and other styles

30

Guérinot, Alexandre E., Spencer P. Magleby, Larry L. Howell, and Robert H. Todd. "Compliant Joint Design Principles for High Compressive Load Situations." Journal of Mechanical Design 127, no. 4 (June 17, 2004): 774–81. http://dx.doi.org/10.1115/1.1862677.

Full text

Abstract:

Buckling failure has been a major obstacle in designing compliant joints in high compression applications. This paper describes two principles, isolation and inversion, that can be successfully applied to many compliant joints to increase their ability to withstand high compressive loads by avoiding buckling-prone loading conditions. Isolation and inversion give rise to a new breed of compliant joints called high compression compliant mechanisms (HCCM). HCCMs have many of the inherent advantages of compliant mechanisms with the additional qualities of high load-bearing joints. This added robustness in compression can be achieved without adversely affecting the kinematic behavior of the joint.

APA, Harvard, Vancouver, ISO, and other styles

31

Ooi, Eang Pang, Ruslizam Daud, N. A. M. Amin, T. W. Hong, M. S. Abdul Majid, Mohd Afendi, Azizul Mohamad, and Ahmad Kamal Ariffin. "Finite Element Modeling of Intermetallic Compound (IMC) Solder Joints Fracture: Part A." Applied Mechanics and Materials 786 (August 2015): 131–35. http://dx.doi.org/10.4028/www.scientific.net/amm.786.131.

Full text

Abstract:

Solder joints failure due to thermal loads and mechanical loads is a significant reliability concern in electronic devices. From literatures, little attention is paid to the development of methods on predicting fracture behavior of solder joint under mixed-mode loading. This paper presents a finite element modeling of intermetallic compounds solder joints failure based on displacement extrapolation method (DEM). Conceptual study on single edge crack on intermetallic IMC solder joints is presented.

APA, Harvard, Vancouver, ISO, and other styles

32

Welch, Michael. "Classical analysis of preloaded bolted joint load distributions." International Journal of Structural Integrity 9, no. 4 (August 13, 2018): 455–64. http://dx.doi.org/10.1108/ijsi-07-2017-0045.

Full text

Abstract:

Purpose The purpose of this paper is to develop the understanding of how external loads are reacted through preloaded bolted joints and the interaction of the joint elements. The paper develops ideas from how to do an analysis to understanding the implications of the results. Design/methodology/approach Classical methods of analysis are applied to preloaded bolted joints, made with multiple bolts. The paper considers both the detailed analysis of bolts stresses, fatigue analysis and load-based design analysis, to demonstrate the structural integrity of preloaded bolted joints. Findings In preloaded joints the external tensile axial load and moments are mainly supported by changes in contact pressure at the faying surface. Only a small proportion of the external loads produce changes in bolt tensile stress. The bolts have a significant mean stress but experience a low working stress range. This low stress range is a factor in explaning why preloaded bolted joints have good fatigue performance. Practical implications In many cases the methods presented are adequate to demonstrate the structural integrity of joints. In some cases finite element methods may be more appropriate, and the methods discussed can be used in the validation process. Originality/value The paper brings together a number of concepts and links them into a practical design analysis process for preloaded bolted joints. Interpretation of results, within the context of design standards, is provided.

APA, Harvard, Vancouver, ISO, and other styles

33

Nuñez, Eduardo, Guillermo Parraguez, and Ricardo Herrera. "Bidirectional Response of Weak-Axis End-plate Moment Connections: Numerical Approach." Metals 10, no. 7 (July 17, 2020): 964. http://dx.doi.org/10.3390/met10070964.

Full text

Abstract:

Brittle failure mechanisms can affect the seismic performance of structures composed of intersecting moment resisting frames, if the biaxial effects are not considered. In this research, the bidirectional cyclic response of H-columns with weak-axis moment connections was studied using numerical models. Several configurations of joints with bidirectional effects and variable axial loads were studied using the finite element method (FEM) in ANSYS v17.2 software. The results obtained showed a ductile behavior when cyclic loads are applied. No evidence of brittle failure mechanisms in the studied joint configurations was observed, in line with the design philosophy established in current seismic provisions. However, beams connected to the column minor axis reached a partially restrained behavior. Joints with four beams connected to the column exhibited a partially restrained behavior for all axial load levels. An equivalent force displacement method was used to compare the hysteretic response of 2D and 3D joints, obtaining higher deformations in 3D joints with respect to 2D joints with a similar number of connected beams. Consequently, design procedures are not capable of capturing the 3D deformation phenomenon.

APA, Harvard, Vancouver, ISO, and other styles

34

Tawfik, M. S., and T. D. O’Rourke. "Load-Carrying Capacity of Welded Slip Joints." Journal of Pressure Vessel Technology 107, no. 1 (February 1, 1985): 36–43. http://dx.doi.org/10.1115/1.3264401.

Full text

Abstract:

Welded slip joints, which are used in many high-pressure water transmission pipelines, are vulnerable during earthquakes to axial compressive loads generated by ground movements. This paper analyzes two failure modes associated with: 1) yielding in the vicinity of welded connections, and 2) plastic flow in the curvilinear, belled ends of the joints. The analyses indicate that the axial load causing plastic deformation is from three to five times smaller than that causing yield in straight sections of pipe. Typical slip-joint dimensions are studied, and recommendations are made for improving the axial load-carrying capacity by 50 to 100 percent.

APA, Harvard, Vancouver, ISO, and other styles

35

Janulíková, Martina, Radim Čajka, Pavlína Matečková, and Vojtěch Buchta. "Laboratory Testing of Asphalt Belts Rheological Properties Exposed to Shear Loads / Laboratorní Měření Reologických Vlastností Asfaltových Pásů Při Smykovém Zatížení." Transactions of the VŠB – Technical University of Ostrava, Civil Engineering Series 12, no. 2 (December 1, 2012): 59–66. http://dx.doi.org/10.2478/v10160-012-0018-2.

Full text

Abstract:

Abstract At faculty of civil engineering research is underway which appears with application sliding joints into foundation structures for several years. These sliding joints are applied in order reduce friction from deformation horizontal load effect (effect of undermining or shrinkage and concrete creep and also in prestressed foundation structures in order to allow introduction of prestressing) and they are usually formed from asphalt belts. To better describe the behavior of asphalt belts in sliding joint, it is necessary to know their behavior under the action shear loads over time. For this purpose many laboratory tests are long conducted both for different load conditions (size of the horizontal and vertical loads, the influence of environmental temperature) and different kinds of materials. This paper presents the current knowledge on the basis of measurements carried out so far.

APA, Harvard, Vancouver, ISO, and other styles

36

Li, Ling, Meng Gong, Ian Smith, and Dagang Li. "Exploratory study on fatigue behaviour of laterally loaded, nailed timber joints, based on a dissipated energy criterion." Holzforschung 66, no. 7 (October 1, 2012): 863–69. http://dx.doi.org/10.1515/hf-2011-0077.

Full text

Abstract:

Abstract Exploration of damage accumulation and reliable prediction of the fatigue lives of laterally loaded, nailed timber joints, are important to proper engineering design of wood structural systems subjected to earthquakes, cyclones/hurricanes or other loads causing fluctuating force flows in such joints. Failure of nailed timber joints typically involves the combination of yielding at plastic hinges in nail and/or the crushing of wood under nails. Force-based criteria can predict the static strength of such joints but cannot reliably predict fatigue behaviour because that depends on loading history and the dissipation of energy within plastic nail hinges and/or crushed wood. In this study, the failure modes, damage accumulation and fatigue life of nailed timber joints subjected to reversed cyclic loads under load-control condition were studied. The results showed that there are two failure modes of nailed timber joints, i.e., ductile failure of nails when the applied load level was higher than 85% of the static maximum load to failure (Pmax) and brittle failure when the applied load level was <85% of Pmax. The damage accumulation involved three phases, i.e., damage initiation, damage propagation and failure. Fatigue life of nailed joints under reversed cyclic loads was modelled by an energy criterion that separated dissipated energy into non-damaging and damaging components demarcated by the fatigue limit. This approach replicated the behaviour of nailed joints tested at 20 load levels of fully reversed repetitive cyclic loading.

APA, Harvard, Vancouver, ISO, and other styles

37

Pegado, Helio de Assis, Rafael Felipe De Souza, and Rodrigo de Sa´ Martins. "Allowable Load Assessment in Metal-Composite Double-Lap Joint / Avaliação de Carga Permitida em Junta de Dupla Folga Metal-Composto." Brazilian Journal of Development 7, no. 8 (August 18, 2021): 82563–75. http://dx.doi.org/10.34117/bjdv7n8-456.

Full text

Abstract:

This work consists of evaluating the tensile and compression static allowable stress of a hybrid (metal-composite) riveted joint. The analyzed joint is composed by two sheets of 2014 – T6 aluminium alloy and a T300/5208 Graphite/Epoxy quasi-isotropic laminate, which were joined by twelve Lockbolt Swaged Collar rivets titanium alloy Ti–6Al–4V annealed. The joint was analyzed through a computational model developed using the Finite Element Method (FEM), with the fasteners modelled through the Multi - Springs technique. This method was widely used to simulate the mechanical behaviour metal-metal and composite-composite parts of the joint. It is validated comparing its results with analytical results of metallic joints available in the literature. Through this model, both the allowable load and its distribution in the fasteners of the joint were determined. Since the evaluated joint is subjected to double shear and, therefore, has no eccentricities, the presence of secondary bending was not observed, the bearing and bypass loads were the most relevant in evaluating the allowable loads of the joint. The load distribution in the joint and its components’ safety margin was determined, with the laminate being the limiting component of the allowable load.

APA, Harvard, Vancouver, ISO, and other styles

38

Debnath, Jhuma, Ajay Kumar, and Hrishikesh Sharma. "Numerical investigation of Reinforced-concrete beam-column joints under contact and close-in blast application." Proceedings of the 12th Structural Engineering Convention, SEC 2022: Themes 1-2 1, no. 1 (December 19, 2022): 1203–8. http://dx.doi.org/10.38208/acp.v1.641.

Full text

Abstract:

The behavior of the concrete and the steel material under blast loads are different. They have different mode of failures under blast loads. Also, responses differ according to the blast types concerning the proximity of the charge kept. It causes different failure modes in the structural members. Close-in or contact blast causes the spallation of concrete. In the near-field blasts, it causes bending failure in the structural members. The behavior of the mode of failure of various joint types subjected to contact-blast and close-in blast loads are numerically studied here. Three different joints simulated to carry on blast loads—exterior beam-column joint, interior beam-column joint, and knee joint simulated numerically under the close-in and contact loads. The charge for the contact blasts were applied to the joint is placed in contact with the joint core, and was not put at the beam or the column member of the joint cut section. In the current work, the failure behavior and the response of the RC beam-column joints is concluded.

APA, Harvard, Vancouver, ISO, and other styles

39

Wang, Tao, Xue Gong, Shude Ji, Gang Xue, and Zan Lv. "Friction stir lap welding thin aluminum alloy sheets." High Temperature Materials and Processes 39, no. 1 (December 23, 2020): 663–70. http://dx.doi.org/10.1515/htmp-2020-0024.

Full text

Abstract:

AbstractIn this work, thin aluminum alloy sheets with thickness of 0.8 mm were friction stir lap welded using small shoulder plunge depths of 0 and 0.1 mm. The joint formation, microstructure and mechanical properties were investigated. Results show that voids appear inside the stir zone when the small plunge depth of 0 mm is used because the tool shoulder cannot exert a good material-collecting effect at such low plunge depth. A plunge depth of 0.1 mm causes tight contact between the shoulder and the material and thus results in good material-collecting effect, which is helpful to eliminate the void. Sound joints are attained at a wide range of welding parameters when using the shoulder plunge depth of 0.1 mm. No crack is observed inside the bonding ligament. The joints own higher failure loads when the retreating side (RS) of the joint bares the main load during the lap shear tests. The shear failure load first increases and then decreases with increasing the rotating and welding speeds, and the maximum failure load of 6419 N is obtained at 600 rpm and 150 mm/min. The hardness of the joint presents a “W” morphology and the minimum hardness is obtained at the heat affected zone. The joints present tensile fracture and shear fracture when the advancing side and RS bare the main loads, respectively.

APA, Harvard, Vancouver, ISO, and other styles

40

Razavi, S. M. J., and F. Berto. "Experimental Investigation of Metallic Fiber-Reinforced Adhesively Bonded Joints under Bending." Key Engineering Materials 754 (September 2017): 252–55. http://dx.doi.org/10.4028/www.scientific.net/kem.754.252.

Full text

Abstract:

In the current paper, the geometric and material parameters of metal fibers utilized for strengthening adhesively bonded single lap joints under flexural loading were investigated by using experimental investigations. According to the test results, incorporating metal fibers in the adhesive layer of a bonded joint can have a significant impact on the flexural load bearing of the joint. The distance between the fibers and also the fibers orientation were considered as the key parameters in this research. It was concluded that the load bearing of the joint can be improved by reducing the distance between the fibers and the highest failure loads were obtained for the joints reinforced by fibers in the longitudinal direction.

APA, Harvard, Vancouver, ISO, and other styles

41

Guo, Rui, Dan Yang, Bin Jia, and Deyun Tang. "Seismic Response of GFRP-RC Interior Beam-to-Column Joints under Cyclic Static Loads." Buildings 12, no. 11 (November 16, 2022): 1987. http://dx.doi.org/10.3390/buildings12111987.

Full text

Abstract:

A total of nine specimens were constructed and tested under cyclic loads to investigate the differences in seismic behavior between glass fiber-reinforced polymer (GFRP)-reinforced concrete (RC) joints and RC beam-to-column joints. The experimental parameters included stirrup ratios, axial pressure ratios and concrete strength of the beam-to-column joints. The cyclic loading test results showed that the GFRP-RC beam-to-column joints can withstand significantly high lateral deformations without exhibiting brittle failure. Moreover, the RC beam-to-column joint exhibited significantly higher energy dissipation and residual displacement than the GFRP-RC beam-to-column joint by 50% and 60%, respectively. Finally, a shear capacity calculation method for the core zone of this kind of joint was proposed, which agreed well with the experimental results.

APA, Harvard, Vancouver, ISO, and other styles

42

Tang, Guang Xian, Zhi Chao Jia, Zhi Heng Deng, and He Yong Lu. "Nonlinear Finite Element Analysis on Frame Joints of Steel Truss SRC Beam." Advanced Materials Research 243-249 (May 2011): 229–34. http://dx.doi.org/10.4028/www.scientific.net/amr.243-249.229.

Full text

Abstract:

To understand mechanical characteristics of frame joints of steel truss SRC beam, the accuracy of the proposed method is proved by the comparison between FEA result and test result, considering different steel ratios, cross flank rods and axial loads as well as plastic model of concrete damage. The result indicates that cross section and steel can delay joint damage and improve the bearing capacity, and that axial load can improve joints shear capacity to some extent but joints ductility is decreased, and that constraint of steel to concrete improves brittleness character caused by bad ductility of concrete.

APA, Harvard, Vancouver, ISO, and other styles

43

Pickles, D. M., and C. R. Bellenger. "Load-Bearing in the Ovine Medial Tibial Condyle: Effect of Meniscectomy." Veterinary and Comparative Orthopaedics and Traumatology 06, no. 02 (1993): 100–104. http://dx.doi.org/10.1055/s-0038-1633027.

Full text

Abstract:

SummaryTotal removal of a knee joint meniscus is followed by osteoarthritis in many mammalian species. Altered load-bearing has been observed in the human knee following meniscectomy but less is known about biochemical effects of meniscectomy in other species. Using pressure sensitive paper in sheep knee (stifle) joints it was found that, for comparable loads, the load-bearing area on the medial tibial condyle was significantly reduced following medial meniscectomy. Also, for loads of between 50 N and 500 N applied to the whole joint, the slope of the regression of contact area against load was much smaller. Following medial meniscectomy, the ability to increase contact area as load increased was markedly reduced.The load bearing area on the medial tibial condyle was reduced following meniscectomy.

APA, Harvard, Vancouver, ISO, and other styles

44

Kondo, Atsushi, Toshiyuki Kasahara, and Atsushi Kanda. "A Simplified Finite Element Model of Riveted Joints for Structural Analyses with Consideration of Nonlinear Load-Transfer Characteristics." Aerospace 8, no. 7 (July 19, 2021): 196. http://dx.doi.org/10.3390/aerospace8070196.

Full text

Abstract:

A simplified finite element model of riveted joints for structural analyses which effectively incorporates nonlinear response of riveted joints is proposed. Load-transfer characteristics of riveted joints were experimentally and numerically studied. First, a detailed finite element analysis for the process of a tensile test of a single-row joint which consists of squeezing of the rivet and tensile loading to the joint was conducted to confirm the validity of a conventional method of analysis. The load–relative displacement behaviors of single-row joints observed in the detailed finite element analysis and previously conducted experiments agreed well. Then, a simplified method of the analysis was developed based on the detailed analysis and the experiments and was applied to analyses of multiple-row joints. A nonlinear relationship between load and relative displacement in the simplified analyses had good agreement with the detailed one. Distributed loads to the multiple rivets in the simplified analysis coincided with those of the detailed analysis under the maximum load. Memory and CPU time required to run the simplified analyses were reduced to about 1/4 and 1/6 compared to those of the detailed analysis, respectively.

APA, Harvard, Vancouver, ISO, and other styles

45

Pei, Shiling, Yongle Li, Yulong Bao, Xin Li, and Shizhong Qiang. "Impact of train-induced vibration on railway cable-stayed bridges fatigue evaluation." Baltic Journal of Road and Bridge Engineering 11, no. 2 (June 27, 2016): 102–10. http://dx.doi.org/10.3846/bjrbe.2016.12.

Full text

Abstract:

Under repetitive heavy train traffic, railway steel truss bridges tend to have many fatigue related performance issues, especially at welded joints. Accurate estimation of the stress history at critical locations of welded joints under vehicle loading is important for joint fatigue design. Traditionally, vehicle loads were treated as moving static loads without considering their dynamic effects. In this study, a numerical procedure was introduced to incorporate the effect of dynamic response of the train–bridge coupled system on nodal fatigue damage. The proposed approach employs a twolevel modelling scheme which combines dynamic analysis for the full train-bridge system and detailed stress analysis at the joint. Miner rule was used to determine the cumulative fatigue damage at critical locations on the welded joint. A sensitivity analysis was conducted for different train loading configurations. It was determined that dynamic vibration negatively influences fatigue life. The calculated cumulative damage at investigated locations can more than the damage estimated using only static moving load method.

APA, Harvard, Vancouver, ISO, and other styles

46

Wang, H. H. S., and B. Roth. "Position Errors Due to Clearances in Journal Bearings." Journal of Mechanisms, Transmissions, and Automation in Design 111, no. 3 (September 1, 1989): 315–20. http://dx.doi.org/10.1115/1.3259001.

Full text

Abstract:

The positional errors due to clearances in journal bearings intended to approximate revolute joints are analyzed. Equations are presented which relate joint geometry, external loads, and errors. The paper treats the case common in serial chain manipulators where the revolute joint’s nominal rotational angle is controlled, and it is desired to determine the errors that result from the clearances.

APA, Harvard, Vancouver, ISO, and other styles

47

Yang, Dong Mei, and Xiang Bo Qiu. "A Constitutive Model for Rock Joints under Cyclic Loading." Advanced Materials Research 243-249 (May 2011): 2211–15. http://dx.doi.org/10.4028/www.scientific.net/amr.243-249.2211.

Full text

Abstract:

Cyclic loads are commonly encountered in geotechnical engineering; however most constitutive models do not account for the effect that such loads can have on the mechanical behaviour of soils and rocks. This work is concerned with the behaviour of jointed rock and, as the overall mechanical behaviour of jointed rock is usually dominated by the mechanical behaviour of the joints, it is focused on the behaviour of rock joints under cyclic loads. In particular, an extension of the existed constitutive model for cyclically loaded rock joints is presented. Variations of rock joint stiffness in both the normal and the shear directions of loading due to surface degradation are taken into account. The degradation of asperities of first and second order is considered, while a new relation is proposed for the joint stiffness in the normal direction during unloading. Numerical simulation results show good agreement of model predictions with existing experimental results.

APA, Harvard, Vancouver, ISO, and other styles

48

Ritter, George W., David R. Speth, and Yu Ping Yang. "Qualifications of Adhesives for Marine Composite-to-Steel Bonded Applications." Journal of Ship Production 25, no. 04 (November 1, 2009): 198–205. http://dx.doi.org/10.5957/jsp.2009.25.4.198.

Full text

Abstract:

This paper describes a straightforward method for the design and certification of adhesively bonded composite to steel joints for the marine industry. Normally, certification is based on documented service at sea. Since these joints have not been previously deployed at sea, no data on their performance exist. Using an integrated combination of mechanical property evaluation and finite element modeling, the load- bearing capacity of a joint can be compared with the anticipated seaway loads. Calculated factors of safety for the sandwich design used here show that the joint has adequate strength to maintain structural integrity even after severe environmental exposure.

APA, Harvard, Vancouver, ISO, and other styles

49

Do, Van Si. "EVALUATING FATIGUE LIFE OF THE BUTT WELDED JOINTSUNDER THE EFFECT OF RANDOM LOADING." Journal of Science and Technique 15, no. 2 (June 23, 2020): 5–13. http://dx.doi.org/10.56651/lqdtu.jst.v15.n02.119.

Full text

Abstract:

This paper presents the calculation results from theoretical models and experimental results in determining the fatigue life of butt welded joints subjected to random loads. The theoretical calculating the fatigue life of the butt welded joints was developed on the basis of different methods for calculating of common details published previously. Experiments on determining the butt welded joints’ fatigue life were carried out on theLDS V830vibration test system with the load equivalent to the load used in theoretical calculation.The accuracy of different calculation methods was assessed by comparison of the calculation results and experiment results. With the lowest deviation of 5.6% compared to the experiment results, Dirlik's calculation method is the most suitable to calculate fatigue life of butt welded joints subjected to random loads.

APA, Harvard, Vancouver, ISO, and other styles

50

Liu, Qing Wen, and Fu Qiang Wu. "Characteristic Analysis of Prestressed Concrete Frame Joints with Spread-Ended Beams." Applied Mechanics and Materials 578-579 (July 2014): 648–52. http://dx.doi.org/10.4028/www.scientific.net/amm.578-579.648.

Full text

Abstract:

Three joints of prestressed concrete frame are studied under low frequency reversed loading. The failure and cracks feature, damage characteristics and mechanical properties under seismic loads are comparatively analysed between joints with spread-ended beams and conventional joints. Studies show that the layout of prestressing tendons and joints with spread-ended beams have little influence on the bearing capacity and ductility. Prestressing tendons through the joint core region can improve the shear strength of joints, but tendons through the joint outer region can not. We need to only consider the influence on the area of prestressing tendons through joint core region when calculating the shear strength of joints.

APA, Harvard, Vancouver, ISO, and other styles

Journal articles on the topic 'Joints loads'

Create a spot-on reference in APA, MLA, Chicago, Harvard, and other styles