Journal articles: 'Structural Joints'

1

Lyu, Naesung, and Kazuhiro Saitou. "Decomposition-Based Assembly Synthesis of Space Frame Structures Using Joint Library." Journal of Mechanical Design 128, no. 1 (November 25, 2004): 57–65. http://dx.doi.org/10.1115/1.1909203.

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This paper presents a method for identifying the optimal designs of components and joints in the space frame body structures of passenger vehicles considering structural characteristics, manufacturability, and assembleability. Dissimilar to our previous work based on graph decomposition, the problem is posed as a simultaneous determination of the locations and types of joints in a structure and the cross sections of the joined structural frames, selected from a predefined joint library. The joint library is a set of joint designs containing the geometry of the feasible joints at each potential joint location and the cross sections of the joined frames, associated with their structural characteristics as equivalent torsional springs obtained from the finite element analyses of the detailed joint geometry. Structural characteristics of the entire structure are evaluated by finite element analyses of a beam-spring model constructed from the selected joints and joined frames. Manufacturability and assembleability are evaluated as the manufacturing and assembly costs estimated from the geometry of the components and joints, respectively. The optimization problem is solved by a multiobjective genetic algorithm using a direct crossover. A case study on an aluminum space frame of a midsize passenger vehicle is discussed.

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KUREJKOVÁ, Marta, and František WALD. "Design of haunches in structural steel joints." JOURNAL OF CIVIL ENGINEERING AND MANAGEMENT 23, no. 6 (June 22, 2017): 765–72. http://dx.doi.org/10.3846/13923730.2017.1281838.

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The paper presents research in design of haunches in structural steel joints. Experimental results of six specimens of haunches with and without flanges are presented. Three specimens are without flanges and three specimens are supported by additional flanges. Flanges differ in stiffness to observe the increase in haunch resistances and the effect on buckling shapes. The research finite element model (RFEA) is studied by material and geometrical nonlinear finite element analysis with imperfections under the actual stress conditions and validated on the measured experimental data. The validity is demonstrated on the comparison of load-deflection curves, failure modes, stress distributions and yield line patterns. The stability analysis of a joint with a haunch is related to the research into component based finite element models of complex joints. The input and the results of the research finite element model are summarised in a benchmark case of a haunch with a flange. A numerical study illustrates the effect of the flange stiffness on the joint’s resistance. The effect is demonstrated on a simple arrangement with triangular stiffeners and on a beam-to-column joint. The main goal of the research is to verify proposed design procedure for stiffeners in steel joints.

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Skowrońska, Beata, Tomasz Chmielewski, and Dariusz Zasada. "Assessment of Selected Structural Properties of High-Speed Friction Welded Joints Made of Unalloyed Structural Steel." Materials 16, no. 1 (December 22, 2022): 93. http://dx.doi.org/10.3390/ma16010093.

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Commonly used S235JR structural steel, generally associated with good weldability, was joined by high-speed friction welding (HSFW). The friction welding tests were performed with a rotational speed of n = 8000 rpm and four different values of the unit pressure in the friction phase (pf) in the range of 64–255 MPa. The obtained joints were subjected to metallographic observations using an optical microscope; in selected zones of friction joints the average grain size was specified in accordance with the EN ISO 643:2012 standard; the hardness of friction joints was measured using the Vickers method. The friction-welded joint with the highest pf was EBSD-investigated. The obtained friction-welded joints resembled an hourglass, and the microstructure of individual zones of the joints differed depending on the height (axis, radius) of the observations. The generated joining conditions resulted in a significant refinement of the microstructure in the friction weld—the average grain size is about 1 µm2 (for base material it was 21 µm2). The highest increase in hardness above 340 HV0.1 was recorded in the friction weld of the welded joint with the lowest used value pressure in the friction phase. Such a sharp increase in hardness can make the resulting friction-welded joint become sensitive to dynamic or fatigue loads. The electron backscatter diffraction (EBSD) investigation confirmed the strong refinement of the microstructure in the friction-welded joint and the occurrence of the phenomenon of dynamic recrystallization (DRX). The friction weld was also characterized by a large share of high-angle boundaries (HAGBs) >80%. These results may indicate that during high-speed friction welding it is possible to create conditions like those obtained during the High-Pressure Torsion (the method used to produce UFG materials) process.

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Grigorenko, G. M., V. D. Poznyakov, T. A. Zuber, and V. A. Kostin. "Peculiarities of formation of structure in welded joints of microalloyed structural steel S460M." Paton Welding Journal 2017, no. 10 (October 28, 2017): 2–8. http://dx.doi.org/10.15407/tpwj2017.10.01.

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5

Pozhbelko, V. I., and E. N. Kuts. "Structural Synthesis of a Family of Planar 8-Link Kinematic Chains for Linkages with Multiple Joints and the Most Complex Ternary Link." Proceedings of Higher Educational Institutions. Маchine Building, no. 01 (718) (January 2020): 21–31. http://dx.doi.org/10.18698/0536-1044-2020-1-21-31.

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Structural synthesis of closed kinematic chains to create various mechanisms is the first and most difficult stage of creative design of complex machines due to the large variance of possible structural solutions. In this paper, the authors examine the problem of structural synthesis of a family of eight-link kinematic chains with multiple joints of various types and the most complex three-joint link in order to create multi-loop multiple-joint mechanisms with one degree of freedom. To solve this problem, a synthesis technique is proposed based on the search for all integer solutions of a generalized structural mathematical model of plane linkage mechanisms and the identification of all structurally nonisomorphic kinematic chains using a two-column P-matrix. As the result of the structural synthesis, a family of eight-link multiple joint kinematic chains is obtained, which contains seven new kinematic structures. Examples of creating 1-DOF mechanisms with multiple joints based on the obtained new structures are presented. They confirm the effectiveness of using the structural synthesis procedure and analysis of complex mechanisms with multiple joints in various areas of modern engineering (precise guiding mechanisms, automatic lines, technological machines, robots, manipulators, etc.).

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Sadowski, T., T. Balawender, R. Sliwa, P. Golewski, and M. Knec. "Modern Hybrid Joints in Aerospace: Modelling and Testing / Nowoczesne Połaczenia Hybrydowe W Lotnictwie: Modelowanie I Badania Eskperymentalne." Archives of Metallurgy and Materials 58, no. 1 (March 1, 2013): 163–69. http://dx.doi.org/10.2478/v10172-012-0168-3.

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The aim of the paper is to review different types of modern hybrid joints applied in aerospace. We focused on three particular cases: 1) spot welding - adhesive, 2) rivet-bonded and 3) clinch-bonded joints. The numerical models presented in the paper for these joints describe their complex behaviour under mechanical loading. The numerical calculations performed using ABAQUS code were compared to experimental results obtained by application of the Digital Image Correlation system (DIC) ARAMIS. The results investigated within the paper lead to the following major conclusions: - the strengthening of joints by application of adhesive significantly improve static strength, - the final failure of the joined structural system significantly depends on the surface adhesive area, - the stiffening effects of the hybrid joint lead to higher reliability and durability of the structural joints.

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7

Lyu, Naesung, Byungwoo Lee, and Kazuhiro Saitou. "Optimal Subassembly Partitioning of Space Frame Structures for In-Process Dimensional Adjustability and Stiffness." Journal of Mechanical Design 128, no. 3 (August 11, 2005): 527–35. http://dx.doi.org/10.1115/1.2181599.

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A method for optimally synthesizing multicomponent structural assemblies of an aluminum space frame (ASF) vehicle body is presented, which simultaneously considers structural stiffness, manufacturing and assembly costs and dimensional integrity under a unified framework based on joint libraries. The optimization problem is posed as a simultaneous determination of the location and feasible types of joints in a structure selected from the predefined joint libraries, combined with the size optimization for the cross sections of the joined structural frames. The structural stiffness is evaluated by finite element analyses of a beam-spring model modeling the joints and joined frames. Manufacturing and assembly costs are estimated based on the geometries of the components and joints. Dissimilar to the enumerative approach in our previous work, dimensional integrity of a candidate assembly is evaluated as the adjustability of the given critical dimensions, using an internal optimization routine that finds the optimal subassembly partitioning of an assembly for in-process adjustability. The optimization problem is solved by a multiobjective genetic algorithm. An example on an ASF of the midsize passenger vehicle is presented, where the representative designs in the Pareto set are examined with respect to the three design objectives.

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8

Bauchau, O. A., and S. Han. "Flexible joints in structural and multibody dynamics." Mechanical Sciences 4, no. 1 (February 13, 2013): 65–77. http://dx.doi.org/10.5194/ms-4-65-2013.

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Abstract. Flexible joints, sometimes called bushing elements or force elements, are found in all structural and multibody dynamics codes. In their simplest form, flexible joints simply consist of sets of three linear and three torsional springs placed between two nodes of the model. For infinitesimal deformations, the selection of the lumped spring constants is an easy task, which can be based on a numerical simulation of the joint or on experimental measurements. If the joint undergoes finite deformations, identification of its stiffness characteristics is not so simple, specially if the joint is itself a complex system. When finite deformations occur, the definition of deformation measures becomes a critical issue. This paper proposes a family of tensorial deformation measures suitable for elastic bodies of finite dimension. These families are generated by two parameters that can be used to modify the constitutive behavior of the joint, while maintaining the tensorial nature of the deformation measures. Numerical results demonstrate the objectivity of the deformations measures, a feature that is not shared by the deformations measures presently used in the literature. The impact of the choice of the two parameters on the constitutive behavior of the flexible joint is also investigated.

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9

Beards, C. F. "Damping in Structural Joints." Shock and Vibration Digest 21, no. 4 (April 1, 1989): 3–5. http://dx.doi.org/10.1177/058310248902100403.

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10

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.

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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.

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11

Bechtel, Stephan, Rouven Schweitzer, Maximilian Frey, Ralf Busch, and Hans-Georg Herrmann. "Material Extrusion of Structural Polymer–Aluminum Joints—Examining Shear Strength, Wetting, Polymer Melt Rheology and Aging." Materials 15, no. 9 (April 26, 2022): 3120. http://dx.doi.org/10.3390/ma15093120.

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Generating polymer–metal structures by means of additive manufacturing offers huge potential for customized, sustainable and lightweight solutions. However, challenges exist, primarily with regard to reliability and reproducibility of the additively generated joints. In this study, the polymers ABS, PETG and PLA, which are common in material extrusion, were joined to grit-blasted aluminum substrates. Temperature dependence of polymer melt rheology, wetting and tensile single-lap-shear strength were examined in order to obtain appropriate thermal processing conditions. Joints with high adhesive strength in the fresh state were aged for up to 100 days in two different moderate environments. For the given conditions, PETG was most suitable for generating structural joints. Contrary to PETG, ABS–aluminum joints in the fresh state as well as PLA–aluminum joints in the aged state did not meet the demands of a structural joint. For the considered polymers and processing conditions, this study implies that the suitability of a polymer and a thermal processing condition to form a polymer–aluminum joint by material extrusion can be evaluated based on the polymer’s rheological properties. Moreover, wetting experiments improved estimation of the resulting tensile single-lap-shear strength.

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12

Bechtel, Stephan, Rouven Schweitzer, Maximilian Frey, Ralf Busch, and Hans-Georg Herrmann. "Material Extrusion of Structural Polymer–Aluminum Joints—Examining Shear Strength, Wetting, Polymer Melt Rheology and Aging." Materials 15, no. 9 (April 26, 2022): 3120. http://dx.doi.org/10.3390/ma15093120.

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Generating polymer–metal structures by means of additive manufacturing offers huge potential for customized, sustainable and lightweight solutions. However, challenges exist, primarily with regard to reliability and reproducibility of the additively generated joints. In this study, the polymers ABS, PETG and PLA, which are common in material extrusion, were joined to grit-blasted aluminum substrates. Temperature dependence of polymer melt rheology, wetting and tensile single-lap-shear strength were examined in order to obtain appropriate thermal processing conditions. Joints with high adhesive strength in the fresh state were aged for up to 100 days in two different moderate environments. For the given conditions, PETG was most suitable for generating structural joints. Contrary to PETG, ABS–aluminum joints in the fresh state as well as PLA–aluminum joints in the aged state did not meet the demands of a structural joint. For the considered polymers and processing conditions, this study implies that the suitability of a polymer and a thermal processing condition to form a polymer–aluminum joint by material extrusion can be evaluated based on the polymer’s rheological properties. Moreover, wetting experiments improved estimation of the resulting tensile single-lap-shear strength.

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13

Jiao, Jin Feng, Han Wu, Xue Dong Shi, and Hong Gang Lei. "The Static Analysis about Complicated-Welded on Tubular Rectangle-Joints." Applied Mechanics and Materials 275-277 (January 2013): 956–60. http://dx.doi.org/10.4028/www.scientific.net/amm.275-277.956.

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Welded rectangular steel tubular joints have been widely used in large span complicated steel structure engineering .With the type of the joints and structural measures complicated, there is no suitable joints theory formula in design specifications. In this paper, two different structural measures types of umbrella steel truss # 8 joints and 68 # joints in a Railway Station are static analysis ,which is by means of finite element software ANSYS and based on the principle of the joints member loading simultaneously. The analysis results show that: in the case of the joints member loading simultaneously, the carrying capacity variation of each member is not uniform coordination; With the different angle between the branch pipe of joints and main pipe, the changes of the degree of stress concentration in the four side surfaces of the member is different. The maximum difference is about 2-fold; compared 68 #joint with 8 # joint, its degree of stress concentration on the overall is small, which prove that structural measures of its domain joints is reasonable.

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Van Belle, L., D. Brandolisio, E. Deckers, S. Jonckheere, C. Claeys, B. Pluymers, and W. Desmet. "Experimental validation of numerical structural dynamic models for metal plate joining techniques." Journal of Vibration and Control 24, no. 15 (May 4, 2017): 3348–69. http://dx.doi.org/10.1177/1077546317704794.

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Joined structures are of great industrial relevance. The dynamic effects of joints are, however, often practically difficult to accurately account for in numerical models, as they often lead to local changes in stiffness and damping. This paper discusses the comparison between measurements and simulations of joined panels considering four different joining techniques: adhesive bonding, metal inert gas welding, resistance spot welding and flow drill screwing. An experimental modal analysis is performed on the different systems and the power injection method is applied to determine the loss factors of single plate systems and their joined counterparts. The joined panels are modeled in a holistic simulation environment with particular focus on the joining region, by the application of predefined and generic joint models. A very good agreement is obtained between the simulated dynamic behavior and the experimental results, showing that an accurate representation of the joints has been obtained.

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Subhash, Anju, and Krishnamurthy N. "Analysis of structural changes observed in Prishtavamsha Sandhigatha Vata (osteoarthritis of vertebral column)." Journal of Ayurveda and Integrated Medical Sciences (JAIMS) 5, no. 05 (October 25, 2020): 136–38. http://dx.doi.org/10.21760/jaims.5.5.18.

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Prishtavamsha Sandhi (joints of vertebral column) is the Cheshtavantha Prathara (movable and floating) type of joint. Twenty four joints are present in Prishtavamsha (vertebral column). Intervertebral joints are the joints which connect vertebrae to each other consists of cartilaginous joints in between the vertebral bodies and synovial joint between vertebral arches. Sandhigatha Vata (osteo arthritis) is one among the Vatavyadhi, which can affect all joints in the body. Sandhigatha Vata (osteoarthritis) will be dominated with symptoms like pain, swelling and impairment of function. In Sandhigatha Vata (osteoarthritis), destruction occurs in the joints due to aggrevated Vata. But it is not clear about the type of destruction observed in the joints. To rule out the various structural changes observed in the joints of Prishtavamsha (vertebral column) this work is being undertaken. Among 100 patients suffering from Prishtavamsha Sandhigatha Vata (osteoarthritis of vertebral column), all patients showed structural changes, 38% having Intervertebral disc prolapse, 22% having spondylosis, 20% having osteophytes, 8% with Osteosclerosis, 6% having spondylolisthesis, 5% with fractures and 1 with stenosis justifies structural changes (Hanthi Sandhi) occurs in Sandhigatha Vata (osteoarthritis). All patients had pain and restricted movements, 80% patient had swelling which justifies the symptoms of Sandhigatha Vata (osteoarthritis).

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Clark, Graham, Ung Hing Tiong, and Aditya Jaya. "Aircraft Joints: the Interaction between Corrosion Protection and Structural Performance." Advanced Materials Research 275 (July 2011): 101–4. http://dx.doi.org/10.4028/www.scientific.net/amr.275.101.

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Aircraft joints feature prominently in aircraft structural degradation. Fatigue cracking and corrosion damage can reduce joint strength and degrade service life. Corrosion management can include use of paints and sealants and, increasingly, the application of Corrosion Inhibiting Compounds (CICs) which retard corrosion, by penetrating into crevices and cracks, and displacing water. A combination of coatings and CIC use can provide effective corrosion protection, but both interact - in different ways - with structural performance and overall system durability. This paper discusses the interaction between these two corrosion protection measures and fatigue performance of joints. The first issue relates to a reduction in the fatigue life of mechanically-fastened joints after application of CICs (or other lubricants) The lubricating properties of the CICs reduce the friction at the faying surface, which may change the load transfer characteristics of the joint. The paper discusses results from a test program assessing the fatigue life and failure mode of riveted lap joints; the results show a marked reduction in fatigue life for joints containing CICs, and the paper discusses the changes which may be responsible for the reduction. The second issue discussed is the degradation of protective coatings in service. Joints are key locations for coating cracking and failure, since areas such as sheet ends and fastener heads, where displacements are concentrated, will produce concentrated strain in coatings. So far, however, the potential influence of aircraft loading on coating degradation prognostics has received little attention. The paper discusses the role of joint displacement in service as a factor contributing to early degradation of aircraft coatings, and argues that this local strain effect, and indeed structural loading history, needs to be considered in predicting and assessing rates of coating degradation. It describes initial analyses of displacements in aircraft joints, to identify the levels of coating strain and the roles and relative contributions of the various deflections in the joints. The results indicate the potential for very large strains in coatings.

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Wang, Hai Jun, Yong Yao, Yun Peng Chu, and Dai Guo Chen. "Numerical Simulation on Beam-Column Joint in the Added-Layers Steel Structure under Monotonic Loading." Applied Mechanics and Materials 170-173 (May 2012): 3460–63. http://dx.doi.org/10.4028/www.scientific.net/amm.170-173.3460.

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Add layers for low-rise steel structure building can improve its using function. Use ANSYS analyze three added-layers beam-column joints of steel structure under the Monotonic loading. The results showed that: the joint reinforced by angles belongs to semi-rigid joint. Considering the construction and Structural requirements, the performance of this type joint is the most economical of all. The three joints all experience fully elastic deformation before them destructed, although the joint with only weld is deformation and failure, and the joint reinforced by haunched slab have larger deformability to resistance the plastic deformation, ultimate bearing capacity and initial stiffness, is one of the most conservative way of the joint’s reinforcement.

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18

Reina, José M. Arenas, Rosa Ocaña López, Cristina Alía García, and Julián J. Narbón Prieto. "Technical Evaluation of Structural Adhesive Joints under Adverse Operation Conditions." Materials Science Forum 797 (June 2014): 169–74. http://dx.doi.org/10.4028/www.scientific.net/msf.797.169.

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This work analyzes the degradation of aluminum-composite adhesive joints under the action of water and motor oil. For this purpose, we have performed an accelerated ageing of the adhesive joint by immersion in water and oil. Likewise, we have evaluated the loss of mechanical properties that aging causes into adhesive joint. First, tests have been performed with bulk adhesive specimens (epoxy and polyurethane) immersed in water and motor oil during independent periods of time (1 at 128 days) in order to study the diffusion of water and motor oil into the adhesive. Second, we have evaluated the loss of mechanical properties that aging causes in the adhesive joint. Tests conclusions show that water degrades the adhesive more than motor oil. Additionally and under the action of water and motor oil, polyurethane adhesive joints retain their mechanical properties better than epoxy adhesive joints.

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Razmyshlyaev, O. D., S. Yu Maksymov, O. M. Berdnikova, O. O. Prylypko, O. S. Kushnyaryova, and T. O. Alekseyenko. "Effect of external electromagnetic field configuration on metal structure of welded joints of structural steel." Paton Welding Journal 2022, no. 10 (October 28, 2022): 13–17. http://dx.doi.org/10.37434/tpwj2022.10.02.

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Sun, Huibin, Wei Lu, Jiancai Wang, Quangang Ren, Xin Xu, Debin Han, Xu Li, Huixiang Yang, Lianbang Wei, and Yan Liu. "Comparative Study on Compressive and Flexural Properties of Concrete-Filled Steel Tubular Arch Joints." Sustainability 14, no. 14 (July 21, 2022): 8916. http://dx.doi.org/10.3390/su14148916.

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Studying the bearing mechanism of concrete-filled steel tubular (CFST) arch components and constructing the quantitative design method of the CFST arch is an important subject in underground support. In order to clarify the bending and compression properties of CFST arch joints, considering different structural parameters of the joint, bending and compression tests of square CFST components without joints, with tubular joints and with flange joints were carried out. The mechanical properties and failure modes of the bending and compression combinations of each component were analyzed, and the influence of structural parameters of joints on their bearing capacity was clarified. The results show that (1) the failure mode of the component without a joint and the component with a tubular joint present uniform curve deformation, and the flange joint presents typical brittle failure and broken line failure; (2) compared to the specimens without a joint and with a flange joint, the tubular joint has higher yielding strength and ultimate strength due to the strengthening effect of the tubular joint, while the bending bearing capacity is 623.639 KN; (3) the tubular length and flange thickness are the key structural parameters of the two types of joints, which have a significant influence on the bending capacity of the specimens; (4) the tubular joint has a simple structure and high bearing capacity, so it should be used as the preferred joint connection form of the concrete-filled steel tubular support arch in deep mine roadways with complex conditions.

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Alqaryouti, Yousef, Dilum Fernando, and Joseph Gattas. "Structural Behavior of Digitally Fabricated Thin-Walled Timber Columns." International Journal of Structural Stability and Dynamics 19, no. 10 (October 2019): 1950126. http://dx.doi.org/10.1142/s0219455419501268.

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This paper aims to investigate the structural behavior of digitally fabricated thin-walled timber sections with edge connectivity provided by integral mechanical press-fit joints. Experimental, numerical, and analytical investigations have been developed to accurately characterize the press-fit section behavior and their failure modes. Plywood fiber orientation, material thickness, and connection tightness are considered as potential factors that may affect the performance of the press-fit jointing system. Experimental testing of square hollow sections (SHSs) under uniaxial compressive loading showed failure of sections through both conventional crushing and novel pop-off bifurcation failures. Pop-off buckling behaviors were shown to be governed by the integral joint transverse stiffness and its magnitude relative to a critical edge stiffness value. Columns with joint transverse stiffness value less than the critical edge stiffness value exhibited pop-off failures. These joint stiffness values were obtained from testing of unloaded joints and were used to obtain accurate predictions of column failure modes. Joint stiffness values for loaded joints were then predicted with an interpolation model mapping axial strain to a tighter connection tolerance and these were used to obtain accurate estimations for column failure load in most of the tested column types. Comparative investigations showed thin-walled sections with integral joints only to be capable of matching the compressive capacities of glued sections, for instances where crushing governed. Similarly, the weight-specific compressive capacity of timber sections was found to be comparable to thin-walled steel sections when crushing governs.

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Chen, Shizhe, Jianrong Pan, Zhan Wang, and Chao Zhou. "Rotation Stiffness Investigation of Spatial Joints with End-Plate Connection." Advances in Civil Engineering 2019 (October 30, 2019): 1–15. http://dx.doi.org/10.1155/2019/8131052.

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Spatial joints with end-plate connections show significant spatial coupling effects under spatial loading. Mechanical behaviour and failure modes of these spatial joints differ from those of planar joints. This study involved experiments and finite element analyses with respect to planar joints with end-plate connections under static load. The numerical results agreed well with the experimental data, and this verified the adequacy of the finite element analyses. Then, finite element models of the spatial interior joint, exterior joint, and corner joint were established to analyse the difference between the mechanical behaviour of spatial joints and planar joints. The component method was used to analyse components contributing to the initial stiffness of spatial joints. An initial rotation stiffness calculation model of spatial joints was proposed based on the deformation of joints. The findings indicated that results of the calculation models were in good agreement with those of the finite element analyses, and this proved that the calculation model proposed in this study could act as a reference method.

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Zhijun, Cheng, Li Wenpei, Fan Pengxian, and Zhang Ning. "Experimental Study on the Impermeability of Concrete Construction Joints with Different Geometric Shapes." Open Civil Engineering Journal 7, no. 1 (August 19, 2013): 109–15. http://dx.doi.org/10.2174/1874149520130708005.

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Concrete construction joints are widely used in underground structures. The structure's impermeability is generally considered as its weak point. In this paper, influence of geometric shape and contact slurry on the impermeability of construction joints has been researched by a model test. Three joint types, including flat joints, arc joints and trapezoid joints, were constructed and tested. The tested construction joints were cast by half individually with a determined time interval to simulate the practical construction process. Each joint type has twelve samples, divided averagely into two groups, one of which was smeared by slurry on the contacts and the other was not. Test result shows that the structural type of construction joints has a great influence on the impermeability of samples. Trapezoid joints have the best impermeability, arc joints take the second place and flat joints are the worst. The contact slurry has a considerable unfavorable effect on the impermeability of construction joints.

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Mohammad Gharouni, S., Hamid M. Panahiha, and Jafar Eskandari Jam. "Space shuttle SRM field joint: Review paper." Metallurgical and Materials Engineering 20, no. 3 (September 30, 2014): 155–64. http://dx.doi.org/10.5937/metmateng1403155g.

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Due to Challenger space shuttle accident in 1986, significant research has been done concerning structural behavior of field joints in solid rocket boosters (SRB). The structural deformations between the clevis inner leg and the tang (male-to-female parts of joint), the sealing of the O-ring to prevent the hot gas in joints, has been neglected causing the failure of the vehicle. Redesigning the field joint in SRB engine by accurate analysis of dynamic and thermal loads and by design of insulator and good O-ring, the leakiness of combustion hot gases was eliminated. Some parts of field joint such as capture feature (CF) and its third O-ring, J-leg insulator and shim were added to redesigned field joint. Also, some adjustments in sealing system and pins were done to promote the efficiency of the field joint. Due to different experimental analysis on assembled field joints with default imperfections, redesigned joints operated well. These redesigned field joints are commonly used in aerospace and mechanical structures. This paper investigates the original and the redesigned field joints with additional explanations of different parts of the redesigned joints.

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Vakakis, A. F. "Scattering of Structural Waves by Nonlinear Elastic Joints." Journal of Vibration and Acoustics 115, no. 4 (October 1, 1993): 403–10. http://dx.doi.org/10.1115/1.2930364.

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An analytic study of the scattering of structural waves by nonlinear elastic joints is presented. Under the assumption of small nonlinearities and/or amplitudes of motion, an averaging methodology is implemented for analyzing the interaction between an incident wave and a nonlinear joint with symmetric stiffness. It is found that, contrary to the predictions of existing linear theories, a single incident wave gives rise to an infinity of reflected waves with frequencies equal to odd multiples of the frequency of the incident wave. The orders of magnitude of the amplitudes of the various reflected waves are considered, and an application of the theory is made by considering the wave scattering from a joint with cubic stiffness nonlinearity. In addition, it is shown that the wave propagation approach presented in this work can be effectively used for predicting nonlinear free oscillations (standing waves) in finite waveguides with nonlinear joints.

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Thummalapalli, Vimal Kumar, and Steven L. Donaldson. "Biomimetic composite structural T-joints." Journal of Bionic Engineering 9, no. 3 (September 2012): 377–84. http://dx.doi.org/10.1016/s1672-6529(11)60130-3.

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Malhotra, V. M. "Structural adhesive joints in engineering." Canadian Journal of Civil Engineering 13, no. 5 (October 1, 1986): 592–93. http://dx.doi.org/10.1139/l86-091.

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Davies, J. M. "Structural adhesive joints in engineering." Thin-Walled Structures 3, no. 1 (January 1985): 86–87. http://dx.doi.org/10.1016/0263-8231(85)90023-0.

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Wnuk, M. P. "Structural integrity of bonded joints." Physical Mesomechanics 13, no. 5-6 (September 2010): 255–67. http://dx.doi.org/10.1016/j.physme.2010.11.006.

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Guo, Yueping. "Vibration containment by structural joints." Journal of the Acoustical Society of America 95, no. 5 (May 1994): 2805. http://dx.doi.org/10.1121/1.409770.

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Alden, John Miles, and Peter Hendrik Brand. "Assessing Structural Safety of Bolted Joints Subject to Cyclic Loading Using Advanced Nonlinear FEA." Advanced Materials Research 891-892 (March 2014): 827–32. http://dx.doi.org/10.4028/www.scientific.net/amr.891-892.827.

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The concepts of structural safety embedded in recognised international standards for the fatigue design of bolted joints, such as VDI 2230 Part 1, are examined and challenged. This is done by means of theoretical investigation of the behaviour of bolted joints using non-linear finite element analysis. Potential differences between actual bolted joint parameters and behaviour, and implicit design assumptions, are reviewed and their effect on the structural safety of bolted joints in operating equipment examined. An approach to the fatigue design of bolted joints is presented which incorporates alternative concepts of structural safety and uses advanced CAE methods as part of the standard design process.

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Peng, Li Ying, Jun Wei, and Xia Ban. "Experimental Study on Influence on Structural Mechanical Behavior Caused by Steel Bar Corrosion of Hollow Slab Hinge Joints." Advanced Materials Research 163-167 (December 2010): 1058–62. http://dx.doi.org/10.4028/www.scientific.net/amr.163-167.1058.

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Through experiment and theoretical analysis, this paper researched the influence of steel bar corrosion of hollow slab hinge joints on the structural mechanical behavior. The results showed that when load was little corrosion of hinge joints steel bar would do little to affect the joint between hollow slabs and hinge joints would work together with hollow slabs as a whole. When load was large, corrosion of hinge joints steel bar would decrease the joint between hollow slabs.

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33

Hart-Smith, L. J. "An Engineer'S Viewpoint on Design and Analysis of Aircraft Structural Joints." Proceedings of the Institution of Mechanical Engineers, Part G: Journal of Aerospace Engineering 209, no. 2 (April 1995): 105–29. http://dx.doi.org/10.1243/pime_proc_1995_209_278_02.

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The design of structurally efficient joints in aircraft fuselage structures and wing skin splices is addressed. It is contended that the joints should be designed first and the gaps in between filled in afterwards, taking pains not to optimize the basic structure first and then discover that it either cannot be assembled or that, when it is assembled, it is full of weak-link fuses. Both adhesively bonded and mechanically fastened joints are covered. Analogies are drawn between the characteristics of both classes of joints. The aspects of static joint strength and fatigue lives are included. The work is applicable to metallic as well as composite structures, and covers both high-load wing joints which have already been tested and new ideas for fuselage splices which have not. The effects of flaws and defects are associated with the need for damage tolerance, particularly in fuselage structures.

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Milčić, Dragan, Dragan Mitić, Nenad Radović, Miodrag Milčić, and Aleksija Đurić. "Characterization of welded joints with Partial penetration on S355N structural steel." Zavarivanje i zavarene konstrukcije 66, no. 4 (2021): 149–59. http://dx.doi.org/10.5937/zzk2104149m.

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Existing standards require welded joints with full penetration. It is considered that welded joints with complete penetration minimize the stress concentration in the root passage. However, there are numerous situations in the industry, in which the load-bearing capacity of the welded joint with partial penetration is satisfactory. If the tests of partially penetrated welds show satisfactory load capacity, the benefits compared to fully penetrated welds are reflected in lower costs, ie less time is required to prepare the joint, less additional material is needed, ie shorter time is required to make the welded joint. The paper presents the testing of butt welded joints of structural steel S355N, with partial penetration, achieved by the MAG welding in the overhead position (PD) in the protection of the gas mixture. The samples were welded with different welding parameters and with different joint preparation, and the tests were performed by non destructive methods (visual inspection, testing with penetrants and magnetic particles) and destructive methods - tension and bending tests, Vickers hardness testing.

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Dmitrik, V. V., A. V. Glushko, and T. O. Sirenko. "Structural changes in metal of welded joints of steam pipelines." Paton Welding Journal 2017, no. 7 (July 28, 2017): 15–18. http://dx.doi.org/10.15407/tpwj2017.07.03.

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Poyarkova, E. V., I. R. Kuzeev, and K. L. Zabelin. "Assessment of Welded Joints Structure Defectiveness Based on the Presence of Non-Metallic Inclusions." Solid State Phenomena 265 (September 2017): 65–69. http://dx.doi.org/10.4028/www.scientific.net/ssp.265.65.

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Both welded joints and base metal are arranged at different structural-scale levels. Unlike the base metal, welded joint can have structural inclusions of complex composition and spatial geometry. During simulation and forecasting of behavior of various characteristics and properties, welded joints quality assessment is not possible without performance of corresponding metallographic studies. The article discusses the non-metallic inclusions in the oxide and silicate types welding joints and their influence on the formation of the metal mechanical properties.

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Tran, Thanh-Tuan, Sangkyun Kang, and Daeyong Lee. "Improving Structural Safety of L-Type Flange Joint for Wind Towers." Energies 15, no. 23 (November 27, 2022): 8967. http://dx.doi.org/10.3390/en15238967.

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This paper focuses on the design modification of L-type flange joint geometry in wind towers, aiming to enhance its structural safety. For this aim, current design issues of existing flange joints are discussed. The numerical simulations indicate that the threaded bolt and flange-to-shell junction are critical locations where failure may happen. Further discussion to improve structural safety is applied for an existing 5 MW flange joint. Through parametric studies, the major factors influencing ultimate strength are identified. The results show that the aspect ratio plays an important role in increasing the structural safety of the flange joints, while the width of the flange segment weakens the stiffness of the flange-to-shell junction. The findings in this study are expected to provide a useful reference for designing the L-type flange joints in practical engineering fields.

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Zhang, Xiaofei, Peipei Wei, Xin Zhang, Tao Yan, Gangfeng Zheng, and Wenwei Zhang. "Experimental Study on Equivalent Strength of Induced Joints with consideration to Influence of Concrete Strength, Inducer Spacing, and Concrete Age." Advances in Civil Engineering 2020 (December 16, 2020): 1–13. http://dx.doi.org/10.1155/2020/5187264.

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To prevent the occurrence of temperature cracking, the induced joints of dams are typically arranged to reduce the tensile strength and orderly guide the crack to form at an induced joint, which can protect the dam structure. The state of the joint surface and the equivalent strength and arrangement of the induced joints have important practical significance for preventing the disorderly cracking of the dam. In this study, the concrete strength, inducer spacing, and concrete age were considered as variable conditions to perform axial tension tests on roller compacted concrete (RCC) bidirectional induced joints. A finite element software was used for numerical simulation, and the simulation results were compared with the experimental results. The equivalent strength of the RCC induced joints increased with the spacing of the induced joints, but the rate of increase gradually declined. The equivalent strength of the RCC induced joints rapidly increased in the early stage, but the strength weakening degree was different at different concrete ages. The strength weakening degree of the induced joint section decreased as the concrete strength increased. These results provide a reference for the setting of induced joints in practical engineering.

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Meneghetti, G., A. Campagnolo, D. Berto, E. Pullin, and S. Masaggia. "Fatigue strength of austempered ductile iron-to-steel dissimilar arc-welded joints." Welding in the World 65, no. 4 (February 22, 2021): 667–89. http://dx.doi.org/10.1007/s40194-020-01058-z.

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AbstractNowadays, the use of different classes of materials in the same structure is increased to keep pace with innovation and high structural performances. In this context, structural components made of different materials need to be joined together and a possible solution is given by arc welding. Dissimilar welded joints must often be able to withstand fatigue loads; however, Design Standards provide fatigue strength categories only for homogeneous welded joints. The aim of the present paper is to compare the fatigue behaviour of EN-GJS-1050 austempered ductile iron-to-S355J2 steel dissimilar joints to the categories of the corresponding homogeneous steel welded joints, as suggested in International Standards and Recommendations. For this purpose, experimental fatigue tests were performed on a selection of dissimilar welded details. First, the microstructure was identified by metallographic analysis; micro-hardness measurements were collected and residual stress profiles were obtained by using the X-ray diffraction technique on a selection of joints. Misalignments were quantified for all specimens. Then, experimental fatigue tests have been performed on a number of joint geometries subject to axial or bending fatigue loadings and tested in the as-welded conditions. The fracture surfaces of the joints have been analysed to locate fatigue crack nucleation sites.

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Olsson, Anders, Andreas Briggert, and Jan Oscarsson. "Increased yield of finger jointed structural timber by accounting for grain orientation utilizing the tracheid effect." European Journal of Wood and Wood Products 77, no. 6 (October 17, 2019): 1063–77. http://dx.doi.org/10.1007/s00107-019-01465-0.

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Abstract Finger joints in structural timber and glulam lamellae are often used to enable production of long members or to allow for re-connection of parts of a member after removal of weak sections. According to the European Standard EN 15497, certain margins are required between knots and a finger joint in structural timber, which means that a considerable amount of clear wood becomes waste when finger joints are applied. The purpose of this paper was to investigate the possibility of reducing the quantity of waste using different criteria for placement of finger joints. The investigation was based on (1) application of methods of colour scanning and tracheid effect scanning to detect knots and grain disturbance on board surfaces, and (2) interpretation of the requirements of EN 15497 regarding where finger joints may be placed. The standard’s requirement when producing finger joints is that the minimum distance between a knot and a finger joint is three times the knot diameter. The standard allows for the minimum distance between a knot and a finger joint to be shortened to 1.5 times the diameter when the local fibre orientation is measured. Utilizing this in simulated production resulted in reduction of waste from 7.4 to 4.0%, when using finger joints simply to produce timber of long lengths. If finger joints are also used to re-connect parts of members after removal of weak sections, even larger savings can be made. Furthermore, it is concluded that knowledge of fibre orientation obtained from scanning could be used not only to decrease the waste in production but also to increase the quality of finger joints.

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Huang, Y. L., K. L. Lin, and D. S. Liu. "Microstructure evolution and microimpact performance of Sn–Ag–Cu solder joints under thermal cycle test." Journal of Materials Research 25, no. 7 (July 2010): 1312–20. http://dx.doi.org/10.1557/jmr.2010.0162.

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The microstructure and microimpact performance of Sn1Ag0.1Cu0.02Ni0.05In (SAC101NiIn)/AuNi/Cu solder ball joints were investigated after a thermal cycle test (TCT). The joints show complete bulk fracture behavior before TCT. Moreover, TCT facilitated interfacial fracture behavior with lower fracture energy. The intermetallic compounds (IMCs) formed in the solder joints before and after TCT were investigated. TCT induces a variety of structural variations in the solder joints, including slipping bands, whisker formation, the squeezing of the IMC layer, the formation of cavities, the rotation and pop-up of grain, and the deformation and rotation of the entire joint. The variations in fracture behavior induced by TCT are correlated with the structural variations in the solder joints.

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Yang, Wenwei, Shuntao Li, Ruhao Yan, and Yaqi Suo. "Experimental Study on Hysteretic Behavior of Double-Plate Reinforced Overlapped K-Joints." Advances in Civil Engineering 2020 (January 3, 2020): 1–14. http://dx.doi.org/10.1155/2020/3183206.

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The lifetime of hollow section tubular joints frequently can be shortened owing to the occurrence of the welded cracks and the plastic deformation of chords under the cyclic loading, because of the deficient radial bearing capacity of the steel tube. To avoid such failures, this paper proposes a novel method to strengthen the chord with double plates at the intersection of the chord and braces. To further investigate the efficiency of this strengthening method on hysteretic performance and energy depletion ability of the overlapped K-joints with hollow sections, two unreinforced K-joints and two reinforced K-joints were fabricated. By loading on the braces with collaborative cyclic loading, the joints failure modes, hysteresis curve, and skeleton curve were obtained. The bearing capacity, ductility, and energy depletion of the joints were assessed and the restoring force model of joints was proposed. The results show that the failure mode of the unreinforced joint is the plastic failure of the surface of the chord. For the K-RC1 (double-plate reinforced square hollow section tubular K-joints), cracks appeared at the junction weld between the through brace and the overlapped brace. However, cracks extended along the weld at the intersection of the chord and the through brace for K-CC1 (double-plate reinforced circular hollow section tubular K-joints). There is no obvious deformation on the chord surface of reinforced joints. Experimental results reveal that the mechanical properties of the joints can be improved effectively by such reinforcement measures and that the plastic deformation of the chord can also be restrained. Meanwhile, the reinforcement measures demonstrate the ability to avoid the risk of large stress concentration of the chord in the area where the braces and chords are intersected. The bearing capacity of the joint was increased; however, the ductility of the joint was weakened.

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43

Błazik-Borowa, E., M. Pieńko, A. Robak, A. Borowa, and P. Jamińska-Gadomska. "Analysis of Ledger-Stand Joints in the Aluminum Modular Scaffold." Archives of Civil Engineering 63, no. 1 (March 28, 2017): 17–31. http://dx.doi.org/10.1515/ace-2017-0002.

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AbstractThis paper concerns an approach to model the ledger-stand joints of modular scaffolds. Based on the analysis of the working range of the ledger (represented by a linear relationship between load and displacement), two models of the ledger-stand joint are analysed: first - with flexibility joints and second - with rigid joints and with a transition part of lower stiffness. Parameters are selected based on displacement measurements and numerical analyses of joints, then they are verified. On the basis of performed research, it can be stated that both methods of joint modelling recommended in this paper, can be applied in engineering practices.

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Gizejowski, M. A., W. Barcewicz, and W. Salah. "Finite Element Modelling of the Behaviour of a Certain Class of Composite Steel-Concrete Beam-To-Column Joints / Skonczenie-Elementowe Modelowanie Zachowania Sie Pewnej Klasy Wezłów Zespolonych Stalowo-Betonowych W Połaczeniach Rygli Ze Słupami." Archives of Civil Engineering 56, no. 1 (March 1, 2010): 19–56. http://dx.doi.org/10.2478/v.10169-010-0002-0.

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Abstract Beam-to-column end-plate joints can be classified as rigid (fully restrained), semi-rigid (partially restrained) or pinned, depending on their type, configuration and the connector arrangement. Fully restrained joints are needed for rigid frames in which there is assumed that the frame joints have sufficient rigidity to maintain - under the service state - the angles between the intersecting members, ensuring the full moment transfer. In contrast in semi-continuous frames, partially restrained joints are characterized by relative rotations occurring between the intersecting members so that the bending moment can only be transferred partially. In recent years, the idea of using partially restrained, unstiffened joints in building structures has gained momentum since this idea appears to be more practical and economical. Semi-continuous frames can resist actions by the bending moment transfer in partially restrained joints, allowing in the same time for a certain degree of rotation that enhances the overall ductile performance of these structures. One of the effective ways that affects ductility of end-plate beam-to-column joints is to use thinner end-plates than those used nowadays in practical applications. In the current study, a certain class of steel-concrete composite joints is examined in which the thickness of end-plates is to be equivalent to approximately 40-60% of the bolt diameter used in all the composite joints investigated in the considered joint class. This paper is an extension of the authors’ earlier investigation on numerical modelling of the behaviour of steel frame joints. The aim of current investigations is to develop as simple as possible and yet reliable three-dimensional (3D) FE model of the composite joint behaviour that is capable of capturing the important factors controlling the performance of steel-concrete end-plate joints in which the end-plate thickness is chosen to be lesser than that used nowadays in conventional joint detailing. A 3D FE model constructed for composite joints of the considered joint class is reported in this paper and numerical simulations using the ABAQUS computer code are validated against experimental investigations conducted at the Warsaw University of Technology. Comparison between the nonlinear FE analysis and full scale experimental results of the considered class of composite joints is presented which conclusively allows for the accuracy assessment of the modelling technique developed. Comparison between the FE results and test data shows a reasonable agreement between the numerical FE model developed and physical model of experimentally examined joint specimens. Finally, practical conclusions for engineering applications are drawn.

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Hatala, Michal, Imrich Orlovský, and Svetlana Radchenko. "Influence of Welding Parameters to Quality of Welds from Structural Steel." Key Engineering Materials 581 (October 2013): 287–91. http://dx.doi.org/10.4028/www.scientific.net/kem.581.287.

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Welding is the most widely used technology of creating permanent joints in the engineering industry. Correct setting of welding parameters predisposes quality weld joint without unwanted defects. Article deals with the influence of fusion welding parameters on the final quality welds. Describes the thermal cycle of welding and its effects on the weld joint and theoretically describes used methods MIG / MAG. Core of the article is devoted to the description of the experiment and on the technological parameters of the welding process. Quality of weld is tested visually, metallographic and microhardness measurement of the weld joints.

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46

Cao, Yan, and Zhao Yang. "Seismic Damage Evaluation of Beam-Column Joints in Monolithic Precast Concrete Frame Structures." Materials 15, no. 17 (September 1, 2022): 6038. http://dx.doi.org/10.3390/ma15176038.

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Quantitative calculation and evaluation of seismic damage are very important for structural safety, performance-based structural analysis, and seismic reinforcement. However, the relevant research results for precast concrete structures are extremely limited. In this paper, the seismic damage evaluation of beam-column joints in monolithic precast concrete frames was studied through cyclic loading tests and damage index calculation. The seismic damage process, load-displacement relationship, stiffness degradation, and the influence of axial compression ratio were analyzed, then the damage indexes were calculated and analyzed, and the quantitative evaluation of joint damage was conducted last. The results show that the connection seams can significantly affect the mechanical properties of precast joints, easily causing damage concentration, resulting in a lower bearing capacity and faster stiffness degradation compared with a cast-in-situ joint. A larger axial compression ratio can bring higher bearing capacity for the precast joints, and the peak load can be increased by 42.9% when the axial compression ratio is increased from 0.2 to 0.4. In contrast, the stiffness degradation will be accelerated with the increase in the axial compression ratio. From yield load to peak load, the stiffness of the precast joint with the largest axial compression ratio decreases by 46.0%, while the joint with the smallest axial compression ratio is only 36.4%. The damage index model adopted in this paper can accurately reflect the damage characteristics of the precast joints. The presented damage states based on the damage index calculation can accurately reflect the joint’s damage characteristics according to different stages. The paper realizes the quantitative damage evaluation for this kind of joint and provides a theoretical basis and method for further studies.

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47

Amsyar, Faisal, Cher Siang Tan, Chau Khun Ma, and Arizu Sulaiman. "Review on Composite Joints for Cold-Formed Steel Structures." E3S Web of Conferences 65 (2018): 08006. http://dx.doi.org/10.1051/e3sconf/20186508006.

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Introduction of the lightweight cold-formed steel (CFS) sections to building construction has been well-established these days due to its high structural performance, corrosion resistance, ease of construction and maintenance as well as aesthetic appearance. In the early of 21th century, researchers found out that the structural performance of the CFS can be improved significantly by integrating it with other materials, for instance, concrete, to create the composite system. This is due to concrete material is excellent in compression but less effective to resist tension force. There were little works being carried out and lack of technical literature regarding on the composite connections for CFS structural frames, especially on the composite beam-to-column joints. This paper aims to collect and review on the previous researches of composite joints for CFS structures from the past two decades. The review is made in three distinctive topics i.e. CFS beam-to-column joints, composite beam-to-slab joints and composite beam-to-column joints. Most of the investigations indicated that composite joint yields higher ultimate load and moment resistance compared to the non-composite joint.

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48

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.

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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.

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Fernandes, Francisco Jose, and Renato Pavanello. "Topology optimization of adhesive material in a single lap joint using an evolutionary structural optimization method and a cohesive zone model as failure criterion." Proceedings of the Institution of Mechanical Engineers, Part L: Journal of Materials: Design and Applications 236, no. 4 (November 18, 2021): 757–78. http://dx.doi.org/10.1177/14644207211056945.

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This paper presents a study of the use of a structural optimization process coupled to a failure model in the adhesive material in single lap bonded joints. The critical point of these joints is in the region of the adhesive material, which performs the function of stress transmission between the structural elements. Owing to the single lap bonded joints shape, the applied loads are eccentric about the joint axis, resulting in a concentration of stress on the overlapping ends. In this study, numerical simulations in two and three dimensions were performed through finite element analysis to model an single lap bonded joints. An optimization procedure based on the bidirectional evolutionary structural optimization method was used to minimize the single lap bonded joints compliance under volume constraints. The design domain considered was restricted to the adhesive region. The cohesive zone model and the bidirectional evolutionary structural optimization method were simultaneously applied. The numerical results for two types of adhesives, with ductile and brittle failure behavior, enabled the establishment of mechanisms for determining the efficient positioning and quantity of adhesive materials.

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Grishin, V. I., M. A. Glebova, Yu I. Dudarkov, E. A. Levchenko, and M. V. Limonin. "Strength analysis of structural elements and metal-composite joints of a flying vehicle." Spacecrafts & Technologies 4, no. 4 (December 4, 2020): 191–200. http://dx.doi.org/10.26732/j.st.2020.4.01.

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The strength and load-bearing capacity analyses results for flying vehicle typical structural elements and joints are presented in the paper. Calculations were made with the use of nonlinear finite element method, implemented in software NASTRAN and ABAQUS. Structural composite panels and metal-composite joints in attachment points of moving components under consideration for research. Employed computational models and procedures, obtained results analysis process are presented. Numerical strength estimations of structural panels and joint strength confirmed with test results. On the example of a virtual test simulation of composite panels’ strength test in a shear frame, the effect of experimental conditions on obtaining results is evaluated. It is shown that boundary conditions realized in such tests cannot always give correct values of panels’ global buckling critical stress. The computation results of buckling and strength of metal-composite joints in attachment points of moving components are presented. The computation performed on a detailed model with employing solid elements and taking into account contact interaction between joint parts, geometrical and physical nonlinearities. Composite strength in bolted joints is made based on Nuismer criterion. The formed recommendations for improvement made it possible to avoid earlier failure of the considered joint in strength tests.

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Journal articles on the topic 'Structural Joints'

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