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Letteratura scientifica selezionata sul tema "Joints"

Autore: Grafiati

Pubblicato: 4 giugno 2021

Ultima modifica: 29 luglio 2024

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Articoli di riviste sul tema "Joints"

Zare, Samira, Alex Spaeth, Sandya Suresh e Mircea Teodorescu. "Three-Dimensionally Printed Self-Lock Origami: Design, Fabrication, and Simulation to Improve Performance of Rotational Joint". Micromachines 14, n. 8 (21 agosto 2023): 1649. http://dx.doi.org/10.3390/mi14081649.

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Origami structures have made significant contributions to the field of robotics, offering various advantages. One such advantage is their ability to conserve space by transforming the structure into a compact form. Additionally, many origami structures can be fabricated in a flat state to simplify manufacturing, giving them the potential for large-scale and cost-effective production. Rotational joints play a crucial role in the construction of robotic systems, yet origami rotational joints can suffer from a limited range of motion. We previously theoretically proposed the Self-Lock Joint to address this issue, but it is only partially flat-foldable. This paper presents a novel approach to the 3D printing of modular origami joints, such as the Self-Lock Joint, using 3D-printed plates joined with a fabric layer. The compliance of the fabric can improve the joint’s semi flat-foldability or even enable it to achieve complete flat-foldability. Furthermore, the rotational motion of the joint is enhanced, allowing for close to 360 degrees of rotational movement. We assess the physical properties of the joint under both loaded and unloaded conditions in order to identify design trade-offs in the physical properties of the joints. Moreover, as a proof of concept, we construct and demonstrate manipulators utilizing these joints. The increase in rotational movement enabled by this fabrication method, coupled with the compliant joint’s flat-foldability and modular nature, make it a promising candidate for use in a wide range of applications.

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Lyu, Naesung, e Kazuhiro Saitou. "Decomposition-Based Assembly Synthesis of Space Frame Structures Using Joint Library". Journal of Mechanical Design 128, n. 1 (25 novembre 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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kinaine, Alaa Faisal, e Haider M. Al-Jelawy. "Using Short Ultra-High Performance Concrete Link Slab as an Alternative to Steel Dowel Bars in Rigid Pavements". IOP Conference Series: Earth and Environmental Science 1232, n. 1 (1 settembre 2023): 012053. http://dx.doi.org/10.1088/1755-1315/1232/1/012053.

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Abstract To prevent problems from occurring at the joint region in bridge construction, link slab was introduced to hide the apparent expansion joint and retain its function. This research describes experimental tests that investigate the use of an ultra-high performance concrete (UHPC), for its high sustainability properties, as a short link slab instead of apparent expansion joints and their respective steel dowels in joint plain concrete pavement (JPCP) while maintaining the expansion joint’s proper function. Similar to dowelled joints, the proposed joint distributes load between adjoining slabs while allowing for contraction and expansion of the pavement due to temperature and moisture variations. Modified cantilever tests were conducted on JPCP slab segments with regular dowelled joints and UHPC link slab joints to investigate the load-deflection response and load transfer of both joints and make comparison. The experimental results showed that UHPC link slab specimens exhibited less deflection at the face of the joint and less relative deflection between the adjoining slabs than steel dowel bar specimens. The test outcomes also showed that joint width did not have a noticeable influence on the load-deflection behavior of the UHPC link slab specimens, but it obviously affected the dowelled joints. Also, UHPC link slab specimens showed an improvement in ultimate load capacity by 23.33% and 11% compared with dowelled joints. Furthermore, the UHPC link slab joints exhibited a better load transfer between slab segments than the dowelled joints. It was concluded that even a short link slab can be superior to standard dowelled joints

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Vavrusova, Kristyna, Antonin Lokaj, David Mikolasek e Oldrich Sucharda. "Analysis of Longitudinal Timber Beam Joints Loaded with Simple Bending". Sustainability 12, n. 21 (9 novembre 2020): 9288. http://dx.doi.org/10.3390/su12219288.

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The joints in timber structures are often the decisive factor in determining the load-bearing capacity, rigidity, sustainability, and durability of timber structures. Compared with the fasteners used for steel and concrete structures, fasteners for timber structures generally have a lower load-bearing capacity and rigidity, with the exception of glued joints. Glued joints in timber structures constitute a diverse group of rigid joints which are distinguished by sudden failure when the joint’s load-bearing capacity is reached. In this contribution, the load-bearing capacity of a longitudinal joint for a beam under simple flexural stress is analyzed using glued, double-sided splices. Joints with double-sided splices and connecting screws were also tested to compare the load-bearing capacity and rigidity. A third series of tests was carried out on joints made using glued double-sided splices augmented with screws. The aim of this combined joint was to ensure greater ductility after the load-bearing capacity of the glued splice joint had been reached.

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Kurtenoks, Viktors, Aleksis Kurajevs, Karina Buka-Vaivade, Dmitrijs Serdjuks, Vjaceslavs Lapkovskis, Viktors Mironovs, Andrejs Podkoritovs e Martins Vilnitis. "The Quality Assessment of Timber Structural Joints Using the Coaxial Correlation Method". Buildings 13, n. 8 (28 luglio 2023): 1929. http://dx.doi.org/10.3390/buildings13081929.

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With the growing popularity of timber structures, the requirement for reliable and non-destructive methods to assess the quality and condition of structural joints becomes increasingly essential. A novel coaxial correlations method is investigated to assess the degradation of panel-to-panel moment joints in timber structures. The method involves analysing the response data obtained from accelerometers placed on both sides of the joint and comparing the readings to evaluate the joint’s condition. A specific joint solution to simulate the degradation of the moment joint in laboratory conditions is selected based on its simplicity and the ease with which its degradation can be simulated. The joint consists of angle brackets joined with timber screws and bolts to plywood panels. Gradually unscrewing the timber screws reduces the joint’s stiffness to simulate wear and tear over time. The experimental setup includes static loading and finite element modelling (FEM) to determine the rotational stiffness of the investigated joint at each degradation level. A dynamic experiment using vibration loading with sweep signal in the frequency range of 10 Hz to 2000 Hz is conducted to assess the quality of the joint. The conducted research provides valuable insights into the behaviour of timber panel-to-panel connections. The findings highlight the relationship between joint stiffness, vertical displacements, and the proposed dimensionless parameter, volume root mean square value (RMSvol), which offers a more comprehensive assessment of the joint’s condition in three spatial directions. As a result of the research, it has been established that, in the case of linear-type connections, unlike point-type joints, there is a possibility of signal scattering, so it is recommended that power comparisons and evaluations of the response signals from both accelerometers at the initial stage of applying the coaxial correlations method are performed.

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Mucha, Jacek, e Waldemar Witkowski. "The Structure of the Strength of Riveted Joints Determined in the Lap Joint Tensile Shear Test". Acta Mechanica et Automatica 9, n. 1 (1 marzo 2015): 44–49. http://dx.doi.org/10.1515/ama-2015-0009.

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Abstract The article presents the analysis of the structure of the load capacity of riveted joints. For the four joining systems the lap joint specimens were made and tested in the shearing test. The joints were prepared for the three combinations of the DC01 steel and EN AW- 5754 aluminium alloy sheets with the thickness of 2mm. On the basis of the obtained load-elongation diagram tensile shear test curves, the basic parameters defined in the ISO/DIS 12996 standard were determined. In the case of the conventional riveted joints the maximum load capacity of the joint is determined by the strength of the fastener. For the joints with aluminium-steel blind rivet , the load capacity of the joint was on the strength limit of the rivet tubular part and on the strength limit of the sheet material. The strength of the SSPR joint is determined by the mechanical properties of the material of the joined sheets. From all sheets and rivet specimens arrangements the highest load capacity of the joint was obtained for the DC01 sheet material joints, and the lowest load capacity of the joint was obtained for the EN AW-5754 sheet material joints.

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Harl, Boštjan. "Probabilistic behaviour of joints on joint forces in mechanisms". Tehnicki vjesnik - Technical Gazette 22, n. 1 (2015): 113–17. http://dx.doi.org/10.17559/tv-20131023220214.

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Hua, Qiang, Weigang Zhou, Shiqiang Zhu, Yunchang Yao, Chao Cheng, Anhuan Xie e Dan Zhang. "Design of a High-torque Robot Joint and Its Control System". Journal of Physics: Conference Series 2281, n. 1 (1 giugno 2022): 012007. http://dx.doi.org/10.1088/1742-6596/2281/1/012007.

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Abstract The robot joint is one of the key components of robots. With the wide application of robot joints, the demand for joint torque is becoming higher and higher. However, at present, most high-torque robot joints are generally large in weight and size, which creates problems for some applications. For this purpose, a high-torque and high-torque-density robot joint is proposed. To improve the joints’ torque density, the lightweight motor and reducer with a large reduction ratio are selected, and the mechanical structure design is based on weight reduction, miniaturization, and heat dissipation. The maximum torque of the proposed robot joint can reach up to 182Nm, and its mass is only 1.8kg. Besides, an embedded control system is designed to control the robot joint. Many experiments were conducted to measure the robot joint’s characteristics, such as torque, speed, and control features. And the designed robot joints are successfully applied to a biped robot. The results verify the performance of the designed robot joint and its control system.

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Akram, Shazad, Johan Sidén e Kent Bertilsson. "Battery Powered Inductive Welding System for Electrofusion Joints in Optical Fiber Microducts". Electronics 10, n. 6 (21 marzo 2021): 743. http://dx.doi.org/10.3390/electronics10060743.

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Optical fiber microducts are joined together by mechanical joints. These mechanical joints are bulky, require more space per joint, and are prone to air pressure leakage and water seepage during service. A battery powered electrofusion welding system with a resistive-type joint has been recently developed to replace mechanical joints. These resistive-type electrofusion joints require physical connectors for power input. Due to a different installation environment, the power input connectors of resistive optical fiber microduct joints may corrode over time. This corrosion of connectors will eventually cause water seepage or air pressure leakage in the long run. Moreover, due to connector corrosion, resistive-type optical fiber microduct joints cannot be re-heated in future if the need arises. In this study, an inductively coupled electrofusion-type joint was proposed and investigated. This inductive-type electrofusion joint is not prone to long-term corrosion risk, due to the absence of power connectors. Inductive-type electrofusion joints can be re-heated again for resealing or removal in the long run, as no metal part is exposed to the environment. The battery powered inductive welding system can be easily powered with a 38 volts 160 watt-hour battery. The inductive-type electrofusion joint was welded within one second, and passed a 300-newton pull strength test and a 10-bar air pressure leakage test. It was demonstrated that the power input requirement for inductive electrofusion joints is 64% higher than that of resistive electrofusion joints. However, these inductive joints are relatively easy to manufacture, inexpensive, have no air leakage, and no water seepage risk in highly corrosive environments.

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Yousefi, Armin, Ahmad Serjouei, Reza Hedayati e Mahdi Bodaghi. "Fatigue Modeling and Numerical Analysis of Re-Filling Probe Hole of Friction Stir Spot Welded Joints in Aluminum Alloys". Materials 14, n. 9 (23 aprile 2021): 2171. http://dx.doi.org/10.3390/ma14092171.

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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.

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Più fonti

Tesi sul tema "Joints"

ath, Shrikant Sainath Shrikant. "Joint contact modelling of articular cartilage in synovial joints". Thesis, University of Leeds, 2010. http://etheses.whiterose.ac.uk/1025/.

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Hip joint is one of the important load bearing joints and has been extensively studied to investigate contact mechanics and tribology. It has known to experience high contact forces and stresses. However, cartilage shows remarkable lubricating and wear properties, and survives the lifetime of a person. Biphasic lubrication based on the principle of fluid load support has provided an explanation for this. However, when, the cartilage fails the part or whole of the joint needs to be replaced and hemiarthroplasty is one such remedy. Three-dimensional finite element models with elastic/hyperelastic cartilage have been used to investigate contact mechanics of the hip joint. However, to understand the role of interstitial fluid in contact mechanics and tribology, cartilage has to be modelled as biphasic material. Interventions such as hemiarthroplasty may alter this phenomenon and hence it is also important to know the extent of this effect. This study was thus an attempt to address these issues. An algorithm developed earlier for 2-D problems was refined, adapted and tested for 3-D problems to detect nodes in contact to impose surface fluid flow conditions. This was then used in natural hip joint where fluid load support was found to be very high (~94%). Three-dimensional hemiarthroplasty was then experimentally verified using porcine hips. The methodology was then used to investigate the effect of clearance in hemiarthroplasty which confirmed the earlier findings that undersizing of the femoral head increases both contact and shear stresses probably leading to cartilage erosion. The investigation of the activities of daily living showed lower contact stresses when compared to the outcomes of clinical studies and depended not only on the magnitude of the load but also on their locations. In all the models the total fluid load support was very high and was between ~90% which supported the biphasic lubrication hypothesis.

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Page, Steven M. "Investigation into the Behavior of Bolted Joints". Wright State University / OhioLINK, 2006. http://rave.ohiolink.edu/etdc/view?acc_num=wright1163527930.

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Fischer, Seth Gavin. "Joints and connections". Thesis, Virginia Tech, 2004. http://hdl.handle.net/10919/36310.

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Istanbul is a city on the water and historically has been a link between East and West. Unlike most cities, ferry boats are one of the most commonly used means of travel, along with rail and bus lines. There is a contrast between the grandeur of the historic buildings as seen from the water and the unpleasantness of disembarking from the ferry, which berths at a small shed-like structure on the edge of the water which has old tires attached to piles driven into the bank of the Golden Horn. Some distance away there is a bus terminal and train stop. The paths of travel between these are unclear and the area is chaotic. Architecture has the potential to join and connect people, physical forces, the past and present at various scales. This project seeks to accomplish this connection on a particular site by building a new structure out in the water as a central focal point and joining it to rail and bus links with a tunnel and elevated covered walkways.
Master of Architecture

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Lam, Kwok-wai. "Design and development of a new prosthetic device for proximal interphalangeal joint replacement". Click to view the E-thesis via HKUTO, 2007. http://sunzi.lib.hku.hk/hkuto/record/B3889161X.

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Schumacher, Brian. "An analysis of the femoral head/stem taper lock for orthopaedic prostheses". Thesis, Georgia Institute of Technology, 1992. http://hdl.handle.net/1853/18927.

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Chen, K. C. "Fatigue of dovetail joints". Thesis, University of Oxford, 1985. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.355721.

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Helliwell, Philip Stephen. "Stiffness in human joints". Thesis, University of Leeds, 1993. http://etheses.whiterose.ac.uk/4401/.

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Articular stiffness is an important symptom in most arthritic diseases and appears to be a useful marker of disease activity in rheumatoid arthritis. Attempts to obtain a reliable objective measure of articular stiffness span the last 30 years but a meaningful measure of this symptom remains elusive. A number of reasons have been suggested to explain the discrepancy between objective and subjective stiffness in arthritis and these can be summarised as: a semeiological confusion, aberrant mechano-receptor thresholds and concurrent muscle wasting. This thesis examines each of these hypotheses. Some patients may confuse pain and stiffness or may wish to use other words to describe their joint symptoms. A questionnaire was developed which enabled patients to express their joint symptomatology using a wide range of descriptors. No differences were found between health professionals and patients in their definition of each of the descriptors. The questionnaire discriminated clearly between groups of patients with rheumatoid arthritis, ankylosing spondylitis and non-articular rheumatism. Movement perception threshold was measured in the finger but it was found that subjects relied on cutaneous information. Vibration perception threshold was used as an alternative measure of mechano-receptor thresholds: no abnormalities were found in 50 patients with rheumatoid arthritis. Muscle cross-sectional area was calculated from anthropometric data and the results compared with measurements obtained from computed tomographic scans. A significant decrease in forearm muscle cross-sectional area was found in rheumatoid arthritis but the decrease was not sufficient to explain the reduction in grip strength observed, some of the variation being explained by deformity and pain in the joints. From this study it was possible to make a correction for muscle wasting in previously published stiffness data, revealing significant increases in metacarpo-phalangeal joint stiffness in rheumatoid arthritis. This result was confirmed in new data based on the resonant frequency of the wrist. Further data on the qualitative aspects of muscle were obtained by relating dynamic angular wrist stiffness to level of contraction of forearm muscles. Although arthritic subjects differed significantly from normals at maximum activation, when the results were expressed in terms of absolute grip strength no differences were found, suggesting inhibition of muscle activation in rheumatoid arthritis. It is concluded that symptomatic stiffness is objectively quantifiable in arthritis providing measurements are made in relationship to the equilibrium position of the joint and providing a correction is made for muscle wasting.

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Watson, Peter. "Cavitation in human joints". Thesis, Queen's University Belfast, 1987. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.304536.

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Thummalapalli, Vimal Kumar. "Biomimetic Composite T-Joints". University of Dayton / OhioLINK, 2011. http://rave.ohiolink.edu/etdc/view?acc_num=dayton1323547304.

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Ghafoori, Roozbahany Ehsan. "Fracture testing and evaluation of asphalt pavement joints in quasi static tension mode". Thesis, KTH, Väg- och banteknik, 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-96672.

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Asphalt joints are inevitable parts of every pavement. They are constructed for different reasons. Although much attention is dedicated to the construction joints (hot with hot pavement), a scientific approach for cold joints (cold with hot pavement) with respect to large patch constructions is still missing. This report tries to evaluate existing construction techniques and to suggest new testing methods of tests. Although, indirect tensile tests IDT and direct tension tests DTT are familiar in the field of asphalt pavement characterization, they have not been used for the assessment of joint quality so far. In this report, these two test types are evaluated and the results are analyzed using finite element software ABAQUS. The results of the comparison of joint compaction techniques on a laboratory scale suggest that joints with angles seem to show more promising behavior than vertical joints. Also, starting compaction from the hot side generally produces better results than compaction starting from cold side.

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Più fonti

Libri sul tema "Joints"

Beighton, Peter. Hypermobility of joints. 3^a ed. London: Springer, 1999.

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1943-, Morrey Bernard F., e An Kai-Nan, a cura di. Reconstructive surgery of the joints. 2^a ed. New York: Churchill Livingstone, 1996.

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Rogers, Juliet. A field guide to joint disease in archaeology. Chichester: J. Wiley, 1995.

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William, Petty, a cura di. Total joint replacement. Philadelphia: Saunders, 1991.

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1934-, Brown J. C., a cura di. The radiology of joint disease. 3^a ed. Philadelphia: Saunders, 1987.

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R, Salisbury Jonathan, Woods C. G e Byers Paul D, a cura di. Diseases of bones and joints. London: Chapman & Hall Medical, 1994.

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Kirby, Ian J. Making joints. Emmaus, Pa: Rodale Press, 1996.

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Possart, Wulff, e Markus Brede, a cura di. Adhesive Joints. Weinheim, Germany: Wiley-VCH Verlag GmbH & Co. KGaA, 2018. http://dx.doi.org/10.1002/9783527803743.

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Michaely, David. Bones & joints. Princeton, NJ: Films for the Humanities & Sciences, 2004.

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Association, British Cement, a cura di. Construction joints. Crowthorne: British Cement Association, 1993.

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Capitoli di libri sul tema "Joints"

Makovicka Osvaldova, Linda. "Joints". In Wooden Façades and Fire Safety, 25–33. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-48883-3_2.

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Imhof, H., F. Kainberger, M. Breitenseher, S. Grampp, T. Rand e S. Trattnig. "Joints". In Clinical MR Imaging, 211–36. Berlin, Heidelberg: Springer Berlin Heidelberg, 2006. http://dx.doi.org/10.1007/3-540-31555-1_7.

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Samii stifle, Valerie, Ingrid Gielen shoulder elbow tarsus, Eberhard Ludewig carpus, William M. Adams hip, Ingmar Kiefer carpus, Henri van Bree shoulder elbow tarsus e Jimmy Saunders. "Joints". In Veterinary Computed Tomography, 387–419. West Sussex, UK: John Wiley & Sons, Ltd., 2013. http://dx.doi.org/10.1002/9781118785676.ch38.

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Dell’Osso, Antonio, Cinzia Marenzi e Giuseppe Voltini. "Joints". In Atlas of Imaging Anatomy, 221–74. Cham: Springer International Publishing, 2014. http://dx.doi.org/10.1007/978-3-319-10750-9_13.

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Roberts, Anne, e Peter Gardiner. "Joints". In Systems of Life, 17–24. London: Macmillan Education UK, 1993. http://dx.doi.org/10.1007/978-1-349-13443-4_3.

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Gires, F., A. Chevrot, A. Leroy-Willig, M. Wybier, C. Vallée, J. C. Roucayrol e G. Pallardy. "Joints". In MRI of the Body, 263–83. Berlin, Heidelberg: Springer Berlin Heidelberg, 1989. http://dx.doi.org/10.1007/978-3-642-87556-4_20.

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Reeder, Maurice M. "Joints". In Reeder and Felson’s Gamuts in Bone, Joint and Spine Radiology, 331–61. New York, NY: Springer US, 1993. http://dx.doi.org/10.1007/978-1-4613-9520-1_3.

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Imhof, H., F. Kainberger, M. Breitenseher, S. Grampp, T. Rand e S. Trattnig. "Joints". In Clinical MR Imaging, 187–213. Berlin, Heidelberg: Springer Berlin Heidelberg, 1999. http://dx.doi.org/10.1007/978-3-642-97990-3_7.

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O'Hailey, Tina. "Joints". In Rig it Right!, 79–96. 3^a ed. Boca Raton: CRC Press, 2024. http://dx.doi.org/10.1201/9781003431121-7.

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Leckie, Frederick A., e Dominic J. Dal Bello. "Joints". In Strength and Stiffness of Engineering Systems, 1–29. Boston, MA: Springer US, 2008. http://dx.doi.org/10.1007/978-0-387-49474-6_14.

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Atti di convegni sul tema "Joints"

Thompson, Cate, e Jake Brunoehler. "Jointly on Stormwater Joints". In World Environmental and Water Resources Congress 2024. Reston, VA: American Society of Civil Engineers, 2024. http://dx.doi.org/10.1061/9780784485477.107.

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Parmigiani, B. "Joint technologies - pre-moulded joints". In IEE Two Day Colloquium on Supertension (66-500kV) Polymeric Cables and their Accessories. IEE, 1995. http://dx.doi.org/10.1049/ic:19951337.

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Lyu, Naesung, e Kazuhiro Saitou. "Decomposition-Based Assembly Synthesis of Space Frame Structures Using Joint Library". In ASME 2004 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. ASMEDC, 2004. http://dx.doi.org/10.1115/detc2004-57301.

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Abstract (sommario):

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 multi-objective genetic algorithm using a direct crossover. A case study on an aluminum space frame (ASF) of a middle size passenger vehicle is discussed.

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Amir, Yosef. "Bolted Joints-Stochastic Modeling". In ASME 2011 International Mechanical Engineering Congress and Exposition. ASMEDC, 2011. http://dx.doi.org/10.1115/imece2011-65548.

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In general, prediction behavior of bolted joints is very complex due to the uncertainty nature parameters involved in the design. Particularly, bolted Joints under shear load; the coefficient of friction plays a big role in prediction of joint movement. The analytical method of the Extreme Value method is utilized by applying a well-known worst case scenario like VDI 2230 and is sufficient for most of general purpose bolted joint analysis. However, there are cases of bolted joints where this method could leads to a false prediction of bolted joint failures. This paper applies stochastic method in the design of bolted joint modeling. As an example of this method case study of a critical bolted joint to safety presented, the model simulation assumed probabilistic functions for sensitive variables with significant variance like coefficient of friction, preload scatter, and embedment. The simulation presented the prediction of the preload required to sustaining the joint members of no relative movement with a level of 99.97% confidence. Comparisons of extreme value method to stochastic highlighted the cases of benefit to use both methods.

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Rong, Y., e H. S. Tzou. "Simulation and Experiment Study on System Identifications of Elastically Jointed Structures". In ASME 1991 Design Technical Conferences. American Society of Mechanical Engineers, 1991. http://dx.doi.org/10.1115/detc1991-0191.

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Abstract The dynamic characteristics of elastic joints strongly affect the dynamic performance of a jointed structure. In order to study the performance of elastically jointed structure, a theoretical model of elastic joints has been developed based on the concept of dynamic contacts, in which the joint friction and clearance effects are included. A stochastic simulation technique is used to evaluate the system characteristics of jointed structures. In this paper, a time-domain system identification method is presented, which is applied to estimate the dynamic contact parameters of elastic joints and the eigenvalues of jointed structures. The identification system may use the data generated by using the theoretical model, or from experimental tests. The joint contact stiffness and contact damping are identified to be directional dependence of contact angles. The system natural frequencies and damping ratios are varied upon joint clearance variations. The simulation and experiment results are presented in this paper, and show comparisons.

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Farhadi Machekposhti, Davood, N. Tolou e J. L. Herder. "The Scope for a Compliant Homokinetic Coupling Based on Review of Compliant Joints and Rigid-Body Constant Velocity Universal Joints". In ASME 2012 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/detc2012-71514.

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Many applications require a compliant mechanism to transmit rotation from one direct to another direct with constant velocity. This paper presents a literature survey towards the design of compliant constant velocity universal joints. The traditional constant velocity universal joints available from the literature were studied, classified and their mechanical efficiencies were compared. Also the graph representation of them was studied. In the same manner, literature review for different kind of compliant joints suitable for the Rigid-Body-Replacement of constant velocity universal joints was also performed. For the first time a comparison with analytical data of compliant joints was performed. All of compliant universal joints are non-constant velocity and designed based on rigid Hooke’s universal joint. Also we show there are no equivalent compliant joints for some rigid-body joints such as cylindrical joint, planar joint, spherical fork joint and spherical parallelogram quadrilateral joint. However, we may achieve them by combining numbers of available compliant joints. The universal joints found are non-compliant non-constant velocity universal joint, non-compliant constant velocity universal joint or compliant non-constant velocity universal joint. A compliant constant velocity universal joint has a great horizon for developments, for instance in medical or rehabilitation devices.

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Nishizawa, Tatsuo, Kenji Takai, Naofumi Noro, Nobuhiro Kurato e Yasuhiro Nakamura. "Degradation Process of Doweled Transverse Joint of 30 Years Old Concrete Pavement on Expressway in Japan". In 12th International Conference on Concrete Pavements. International Society for Concrete Pavements, 2021. http://dx.doi.org/10.33593/uru2hst1.

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A section of jointed concrete pavement on Tokai-Hokuriku Expressway in the central region of Japan main island was opened in 1986. After 30 year service, small faulting has begun to appear at many joints. In order to grasp the entire situation of the joints, FWD tests were performed at transverse joints in 2011 and 2017, and the structural condition of each joints was evaluated from the results of the tests with a backcalculation method developed in this study. Some of the joints, which were judged to be severely damaged, were excavated to check the actual condition of the joint and validate the developed evaluation method. The evaluation on the joints of this particular concrete pavement revealed that the number of degraded joints has increased rapidly from 2011 to 2017, getting worse in recent years. Also, some backcalculation results imply that many dowels of the joints with the high load transfer efficiency and low deflections were corroded and some of them completely broke, and that a void formed underneath the joint.

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Yoneno, Masahiro, Toshiyuki Sawa, Hidekazu Nishijima e Motohiro Matsuo. "Stress Analysis and Strength of Joints Combining Adhesives With Bolts Subjected to Torsions". In ASME 1996 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 1996. http://dx.doi.org/10.1115/imece1996-0856.

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Abstract The stress distributions in joints combining adhesives with bolts are analyzed by using axisymmetrical theory of elasticity as a three-body contact problem when torsion is applied to the joints. The joints consist of two hollow cylinders and they are fastened by a bolt and nut after being joined with an adhesive. When an external torsion is applied to combination joints, an increment / decrement of torsion occurs in the bolt. A method for estimating the variation of torsion in the bolt is proposed. In addition, using the interface stress distribution, a method for predicting strength of the combination joint is proposed. The torsional load produced in the bolt was measured using strain gauges. Strength of the combination joint was also measured. A fairly good agreement was seen between the analytical and the experimental results. It is shown that the increment of torsional load occurs in the bolt is small. It is found that the strength of the combination joints is greater than that of adhesive joints. It is also seen that the combination joint strength increases as the initial clamping force increases and that it is greater than that of bolted joints without adhesives.

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Traisigkhachol, Ornwasa, Florian Pape e Hans H. Gatzen. "Investigation of Alternative Materials to Si for Solid State Micro Joints". In ASME 2012 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/imece2012-87857.

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A joint’s function is to allow a relative motion between two components. While macroscopic joints typically use bearings or hinges to accomplish articulation, Micro Electro-mechanical Systems (MEMS) commonly take advantage of solid state joints, typically comprising bending or torsion beams. Micro joints made of NiW and the epoxy SU-8™ were fabricated by thin-film techniques and simulated in their usability as spring material. For determining the spring constant of the cantilever beams intended as solid state micro joints, a Hysitron TriboIndenter™ was used. It could be demonstrated that NiW represents a material well suited for sensitive solid state joints. Also SU-8™ as solid state joint was suitable to be applied as a cantilever. SU-8™ cantilevers can be used for higher displacements at greater loads.

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Ma, YunWu, GuanZhong He, Ming Lou, YongBing Li e ZhongQin Lin. "Effects of Process Parameters on Crack Inhibition and Mechanical Interlocking in Friction Self-Piercing Riveting Aluminum Alloy and Magnesium Alloy". In ASME 2018 13th International Manufacturing Science and Engineering Conference. American Society of Mechanical Engineers, 2018. http://dx.doi.org/10.1115/msec2018-6452.

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Friction self-piercing riveting (F-SPR) process has been proposed to join low ductility lightweight materials, and has shown advantages over fusion welding, solid state welding and traditional mechanical joining processes in joining dissimilar as well as low ductility materials. Because of the thermo-mechanical nature of F-SPR process, the formation of the joint is determined by riveting force and softening degree of the materials. However, it is still not clear that how exactly the riveting force and generated frictional heat jointly influence the mechanical interlocking formation and inhibit cracks during F-SPR process. To address these issues, in current study, F-SPR process was applied to join 2.2 mm-thick AA6061-T6 aluminum alloy to 2.0 mm-thick AZ31B magnesium alloy. The correlation of riveting force, torque responses as well as energy input with joint quality were investigated systematically under a wide range of process parameter combinations. It was found that a relatively greater final peak force and higher energy input were favorable to produce sound joints. Based on that, a two-stage method was proposed to better control the energy input and riveting force. It was found that the joints produced by the two-stage method exhibited significantly improved lap-shear strength, i.e., 70% higher than traditional SPR joints and 30% higher than one-stage F-SPR joints. This research provides a valuable reference for further understanding the F-SPR joint formation and process optimization.

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Rapporti di organizzazioni sul tema "Joints"

Ghosh, A., S. M. Hsiung e A. H. Chowdhury. Seismic response of rock joints and jointed rock mass. Office of Scientific and Technical Information (OSTI), giugno 1996. http://dx.doi.org/10.2172/270673.

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Brun, M. K. Formation of tough composite joints. Office of Scientific and Technical Information (OSTI), maggio 1997. http://dx.doi.org/10.2172/319832.

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Thomson, R., e W. R. Tyson. Corrosion fatigue of welded joints. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 1988. http://dx.doi.org/10.4095/305066.

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Hansen, N. R., V. I. Bateman e F. A. Brown. Shock transmissibility of threaded joints. Office of Scientific and Technical Information (OSTI), dicembre 1996. http://dx.doi.org/10.2172/639812.

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Hsiung, S. M., D. D. Kana, M. P. Ahola, A. H. Chowdhury e A. Ghosh. Laboratory characterization of rock joints. Office of Scientific and Technical Information (OSTI), maggio 1994. http://dx.doi.org/10.2172/10165956.

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Broughton, W. R. Durability performance of adhesive joints. National Physical Laboratory, giugno 2023. http://dx.doi.org/10.47120/npl.mgpg28.

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Mohr. L52032 Reliability of Girth Welds in Early Generation Pipelines - Joint Design and Flaw Combinations. Chantilly, Virginia: Pipeline Research Council International, Inc. (PRCI), luglio 2004. http://dx.doi.org/10.55274/r0011221.

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Abstract (sommario):

Demonstrating the reliability of existing pipelines under new loading conditions requires the use of standard methods that have known applicability to that type of pipe and data relevant to the pipe.� Both of these may be lacking for early generation pipelines, such as ones from the 1930s and 1940s, where the girth welds can have been welded with processes not commonly used today (oxyacetylene welding) or with joint designs that use internal backing.� Three types of joint designs were particularly used in this study:� butt joints with an internal backing ring, butt joints with a backing or chill ring and enlarged diameter on either side of the weld (bell-bell chill ring joints), and butt joints where one side of the weld has an enlarged diameter sufficient to slide that side over the other side (bell and spigot joints). Three approaches were taken to demonstrating the capacity of early generation pipelines for longitudinal loading across girth welds.� First, small-scale tests were performed on a variety of girth weld types, determining both stresses and strains to failure and other mechanical properties.� Testing data from individual pipeline companies is included here to add to the available data.� Second, finite-element analyses were performed for welds with internal backing rings so that comparisons could be made between small-scale specimens and full-scale pipes.� The effect of internal pressure was also examined.� Third, two full-scale tests of early generation bell-bell chill ring welds were performed with combined axial loading and internal pressure.

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Koteras, J. Studies of computational models for jointed media with orthogonal sets of joints. Office of Scientific and Technical Information (OSTI), marzo 1990. http://dx.doi.org/10.2172/137728.

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Rimpel. PO-316-10208-R01 Guideline for Assembly and Maintenance of Bolted Joints in High Vibration Environments. Chantilly, Virginia: Pipeline Research Council International, Inc. (PRCI), marzo 2011. http://dx.doi.org/10.55274/r0010984.

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Abstract (sommario):

This guideline is intended to provide a practical review of installation and maintenance practices for bolted joints that will minimize the likelihood of leakage or joint failure. The guideline addresses topics such as preload selection, installation tools, lubrication, gaskets, assembly procedures, preload verification tools, maintenance procedures, and vibration loosening. The guideline is designed to provide engineers and technicians with the knowledge necessary for successful assembly and maintenance of bolted joints. Use with caution. GMRC decided to pull this document from circulation due to unresolved issues with certain sections of the guideline. (6/6/2011)

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Tsai, Hsi C., James Alper e David Barrett. Failure Analysis of Composite Bonded Joints. Fort Belvoir, VA: Defense Technical Information Center, marzo 1999. http://dx.doi.org/10.21236/ada375743.

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