Littérature scientifique sur le sujet « Joints with mechanical fasteners »

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Articles de revues sur le sujet "Joints with mechanical fasteners"

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

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This paper presents a numerical investigation into the effects of missing fasteners on the mechanical characteristics of double-lap, multi-row composite bolted joints. A highly efficient explicit finite element model, which was validated effective and accurate by experiments, was developed and employed to conduct the virtual tests. Single-column and multi-column joints with various positions of missing fastener were considered. It is shown that the removal of fasteners can reduce the joint stiffness significantly, especially in joints with fewer columns or missing fasteners in the outside rows. The removal of fasteners can also cause considerable reductions in both the initial significant failure loads and ultimate loads of multi-column joints, while in single-column joints only the initial significant failure loads are influenced. Considering the load distribution, it is suggested that bolts in the same column as or in the adjacent column to the missing fastener experience a notable growth in load. Meanwhile, if a bolt bears more loads in the pristine joint, the larger changes in stiffness, ultimate strength, and load distribution may be obtained when it is lost.
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Godzimirski, Jan, Marek Rośkowicz, Michał Jasztal et Iga Barca. « Static and Fatigue Strength and Failure Mechanisms of Riveted Lap Joints of CFRP Composites ». Materials 16, no 5 (21 février 2023) : 1768. http://dx.doi.org/10.3390/ma16051768.

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The background of this work is the search for the most effective ways of joining composites, inter alia in aeronautical applications. The purpose of this study was to analyze the impact of mechanical fastener types on the static strength of lap joints of composite elements and the impact of fasteners on the mechanism of failure of such joints under fatigue load. The second objective was to check to what extent the hybridization of such joints, consisting of supplementing them with an adhesive joint, affects their strength and the mechanism of failure of such joints loaded with fatigue. Damage to composite joints was observed using computed tomography technology. The fasteners used in this study (aluminum rivets, Hi-lok and Jo-Bolt) differed not only in terms of the materials they were made of, but also in terms of the pressure forces they exerted on the joined parts. Finally, in order to check how a partially cracked adhesive joint affects the load on the fasteners, numerical calculations were carried out. Analyzing the results of the research, it was found that partial damage to the adhesive joint of the hybrid joint does not increase the load on the rivets and does not impair the fatigue life of the joint. An important advantage of hybrid joint is the two-stage destruction of the connection, which significantly increases the safety of aircraft structures and facilitates the process of supervising their technical condition.
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Chowdhury, Nabil, Wing Kong Chiu et John Wang. « Review on the Fatigue of Composite Hybrid Joints Used in Aircraft Structures ». Advanced Materials Research 891-892 (mars 2014) : 1591–96. http://dx.doi.org/10.4028/www.scientific.net/amr.891-892.1591.

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The use of composite materials as a replacement for commonly used metals such as aluminium and steel are increasing in the engineering industry, particularly in the aerospace sector. The move towards light weight and high stiffness structures that have good fatigue durability and corrosion resistance has led to the rapid move from metal to composites. This change allows for further flexibility in design and fabrication of various components and joints. There are three main categories of joints used in composite materials – mechanically fastened joints, adhesively bonded joints and the combination of the two called hybrid joints. In order to adequately understand the effectiveness of these joints, substantial testing and validation is required, particularly in the use of hybrid joints for real life applications. Static testing, load distribution and parametric studies of hybrid joints have been investigated by various researchers; however further work is still required in understanding the durability and fatigue of hybrid joints and ensuring that both the adhesive and mechanical fasteners can work together effectively in producing an optimum joint. Mechanical fastening alone in composite laminates is not a preferred joining method as they create high stress concentrations around the fastener holes. Adhesive bonding although has numerous benefits it is difficult to detect the bond defect particularly in cases where weak bonds can occur during applications and it is sensitive towards the environmental conditions. Thus hybrid joints are seen arguably as being more effective in joining composite components together and offer greater residual strength. Hence the performance, strength and long-term durability of these joints need to be further investigated and be applied to practical situations whilst assisting in repair certification.
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Erki, M. A. « Modelling the load–slip behaviour of timber joints with mechanical fasteners ». Canadian Journal of Civil Engineering 18, no 4 (1 août 1991) : 607–16. http://dx.doi.org/10.1139/l91-074.

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An analytical model of behaviour is presented, which uses one-dimensional finite element approximations to predict the short-term load – slip response of a single fastener joint. The model treats the elastoplastic behaviour of the fastener as well as the nonlinear, nonelastic properties of the wood. It accounts for some of the distinctive behaviour of timber joints such as fastener withdrawal, rotational restraint at the fastener ends, joint interface characteristics, and combined fastener bending and axial tension. Good agreement is obtained between model predictions and test behaviour for single fastener glulam rivet, nail, and bolt joints. The model can be adapted to include the variability in wood and fastener properties, and can be incorporated into a large number of computer simulations in order to predict the fifth fractiles of the populations of joint resistances, which can be used in a limit states design approach. Key words: timber structures, glulam rivet connections, nailed connections, bolted connections, mathematical model, finite element, nonlinear analysis.
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Nečasová, Barbora, Liška Pavel et Michal Novotný. « Stress/Strain Behaviour of Mechanical and Adhesive Joints in Timber Façade Applications ». Key Engineering Materials 868 (octobre 2020) : 142–49. http://dx.doi.org/10.4028/www.scientific.net/kem.868.142.

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This paper compares the stress and strain behaviour of mechanical fasteners and elastic adhesive connections in timber façade applications. Two common designs with timber cladding are introduced. The traditional façade planks and multilayer large-format solid wood panels were selected. The resistance of a reference façade section with mechanical fasteners or adhesive bond to wind suction is determined according to the recommendations of European guideline ETAG 034. The pressure/suction chamber allowing hermetic closure was used. The sample deformation was measured at 15 locations, this also allowed to determine the elongation of the adhesive layer at break. The failure loads reached with the adhesive joint exceeded 20 kN/m2 in both combinations of façade cladding. On the other hand, the sample with a large-format panel and mechanical fasteners showed the lowest failure load at 12 kN/m2. The results confirmed that bonded joints are a suitable solution for large-format cladding, whereas an increase in the number of mechanical fasteners will be a more convenient solution for façade plank applications.
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Menzemer, C. C., L. Fei et T. S. Srivatsan. « Design Criteria for Bolted Connection Elements in Aluminum Alloy 6061 ». Journal of Mechanical Design 121, no 3 (1 septembre 1999) : 348–58. http://dx.doi.org/10.1115/1.2829467.

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Plates frequently find use as connecting elements in structures built from aluminum alloys. Many structural elements employ mechanical fasteners. Design of connections necessitates that due consideration be given to: (a) bolt or rivet failure, (b) progressive bearing distress of material adjacent to the fastener(s), (c) net-section tensile failure, and (d) tear out of the fastener group(s). Current design provisions for block shear failures of bolted and riveted joints in aluminum-based alloys make use of models initially developed for structural steels or, alternatively, fail to address an estimation of joint capacity. Shear failure of aluminum connecting elements is the focus of this paper. An experimental and analytical program was undertaken with the objective of studying block shear failure of aluminum connecting elements. Twenty aluminum alloy 6061-T6 gusset plates, representing four different bolt patterns, were mechanically deformed. Models to estimate the capacity of the joints are examined and compared with experimental results. Strain distribution around the periphery of the connections were measured and compared to finite element predictions. The correlations between the design models and experimental observations are highlighted.
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Cope, Dale A., et Thomas E. Lacy. « Modeling Mechanical Fasteners in Single-Shear Lap Joints ». Journal of Aircraft 41, no 6 (novembre 2004) : 1491–97. http://dx.doi.org/10.2514/1.14435.

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Sampaio, Rui F. V., João P. M. Pragana, Ricardo G. Clara, Ivo M. F. Bragança, Carlos M. A. Silva et Paulo A. F. Martins. « New Self-Clinching Fasteners for Electric Conductive Connections ». Journal of Manufacturing and Materials Processing 6, no 6 (12 décembre 2022) : 159. http://dx.doi.org/10.3390/jmmp6060159.

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This paper presents new rotational and longitudinal symmetric self-clinching fasteners to fabricate reliable connections in busbars with low electrical resistance for energy distribution systems. Connections consist of form-closed joints that are hidden inside regions where two busbars overlap. The investigation into the fabrication and performance of the new self-clinched joints involved finite element modelling and experimentation to determine the required forces and to evaluate the electric current flow and the electrical resistance at different service temperatures. The original design of the joints that was proposed in a previous work was modified to account for busbar strips of copper and/or aluminum with similar or dissimilar thicknesses, connected by means of self-clinching fasteners made from the same materials of the busbars, instead of steel. The effectiveness of the new self-clinched joints was compared to that of conventional bolted joints that are included in the paper for reference purposes. The results show that rotational symmetric self-clinching fasteners yield lighter fabrication and more compact joints with a similar electrical resistance to that of bolted joints. They also show that longitudinal symmetric self-clinching fasteners aimed at replicating the resistance-seam-welding contact conditions yield a reduction in electrical resistance to values close to that of ideal joints, consisting of two strips in perfect contact and without contaminant or oxide films along their overlapped surfaces.
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Kenchappa, Bharath, Lokamanya Chikmath et Bhagavatula Dattaguru. « A study on prognostic analysis of attachment lugs under off-axis loading ». International Journal of Structural Integrity 10, no 6 (2 décembre 2019) : 809–24. http://dx.doi.org/10.1108/ijsi-10-2018-0075.

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Purpose Lug joints with fasteners play a crucial role in connecting many major components of the aircraft. Most of the failures in the past were credited to the damages initiating and progressing from these types of joints. Ensuring the structural integrity of these fastener joints is a major issue in many engineering structures, especially in aerospace components, which would otherwise lead to fatal failure. The purpose of this paper is to adopting the prognostic approach for analysing these lug joints with fasteners subjected to off-axis loading by estimating the crack initiation and crack growth life of these joints. This data will be useful to estimate the remaining life of these joints at any given stage of operations, which is mandatory in structural health monitoring (SHM). Design/methodology/approach Straight and tapered lug joints are modelled using the finite element method in MSC PATRAN and analysed in MSC NASTRAN. These lug joints are analysed with a push fit fastener. The contact/separation regions at the pin–lug interface are carefully monitored throughout the analysis for various loading conditions. Critical locations in these lug joints are identified through stress analysis. Fatigue crack initiation and fatigue crack growth analysed is carried out at these locations for different load ratios. A computational method is proposed to estimate the cycles to reach crack initiation and cycles at which the crack in the lug joint become critical by integrating several known techniques. Findings Analysis carried out in this paper describes the importance of tapered lug joints, particularly when subjected to non-conventional way of loading, i.e. off-axis loading. There is a partial loss of contact between pin and lug upon pin loading, and this does not change further with monotonically increasing pin load. But during load reversals, there is a change in contact/separation regions which is effectively handled by inequality constraints in the boundary conditions. Crack growth in these lug joints pertains to mixed-mode cracking and is computed through the MVCCI technique. Originality/value Most of the earlier works were carried out on in-plane pin loading along the axis of symmetry of the lug. The current work considers the off-axis pin loading by loading the lug joints with transverse and oblique pin load. The significance of taper angle under such loading condition is brought in this paper. The results obtained in this paper through prognostic approach are of direct relevance to the SHM and damage tolerance design approach where the safety of the structural components is of foremost priority.
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Eraliev, Oybek Maripjon Ugli, Yi-He Zhang, Kwang-Hee Lee et Chul-Hee Lee. « Experimental investigation on self-loosening of a bolted joint under cyclical temperature changes ». Advances in Mechanical Engineering 13, no 8 (août 2021) : 168781402110394. http://dx.doi.org/10.1177/16878140211039428.

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The most commonly used part in engineering fields is threaded fasteners. There are a lot of advantages of fasteners. One of them is that they can be easily disassembled and reused, but a bolted joint can loosen easily when a transversal load is applied. The clamp load of a bolted joint can also loosen slowly when subjected to repeated temperature changes. This paper presents an experimental investigation of the self-loosening of bolted joints under cyclical temperature variation. Experiments are carried out under several cyclical temperature changes with different bolt preloads. Rectangular threaded bolted joints with M12 × 1.75 bolts and nuts are tested in a specially designed testing apparatus. Material of bolt, nut, and plates is a stainless steel. The experimental results show that the high initial bolt preload may prevent the joint from self-loosening and the bolted joint has loosened significantly in the first cycle of temperature changes. From this investigation, the loosening of the bolted joint can be considered as a first stage self-loosening.
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Thèses sur le sujet "Joints with mechanical fasteners"

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Podbury, Matthew John. « A finite element study of the stress distribution around mechanical fasteners in composite laminates ». Thesis, University College London (University of London), 2002. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.271029.

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Arnold, William Stewart. « The behaviour of mechanically fastened joints in composite structures ». Thesis, University of the West of Scotland, 1989. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.328109.

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Paraschi, Marion. « A fracture mechanics approach to the failure of adhesive joints ». Thesis, Imperial College London, 2002. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.271440.

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Fu, Bin. « Advanced fracture mechanics analysis of shallow surface cracks in fillet welded T-butt plate joints ». Thesis, University of Newcastle Upon Tyne, 1994. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.363860.

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Srinivaas, Sujith. « Testing and Analysis of Innovative High-Speed Automotive Fastening System for Multi Materials ». The Ohio State University, 2020. http://rave.ohiolink.edu/etdc/view?acc_num=osu1587397193415362.

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Whittaker, Jarrod Talbott. « Ductility and Use of Titanium Alloy and Stainless Steel Aerospace Fasteners ». Scholar Commons, 2015. http://scholarcommons.usf.edu/etd/5796.

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The main purpose of this thesis is to investigate the ductility and application of titanium alloys, like titanium 6Al-4V, when used in aerospace fasteners compared to more conventional stainless steel aerospace fasteners such as A286. There have been concerns raised about the safe usability of titanium 6-4 in the aerospace industry due to its lack of strain hardening. However, there is a lack of data pertaining to this concern of safe usage which this thesis aims to address. Tensile tests were conducted to find the ductility indexes of these fasteners which quantify the amount of plastic to elastic elongation. From the tests conducted it was found that the two materials yield and tensile strengths were very similar, though the ductility index of A286 is on average ten times greater than that of titanium 6-4. This thesis includes joint diagram examples that analyze typical joints using both materials. It was found from joint diagram examples that the lower ductility index of the titanium alloy will only be detrimental to use at higher preloads. However, the titanium alloy can be used safely in place of A286 in most loading situations just with narrower safety margins in these controlled examples.
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Gavric, Igor. « Comportamento sismico di edifici lignei a pannelli in legno lamellare incrociato ». Doctoral thesis, Università degli studi di Trieste, 2013. http://hdl.handle.net/10077/8638.

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2011/2012
Cross-laminated timber, also known as X-Lam or CLT, is well established in Europe as a construction material. Recently, implementation of X-Lam products and systems has begun in countries such as Canada, United States, Australia and New Zealand. So far, no relevant design codes for X-Lam construction were published in Europe, therefore an extensive research on the field of cross-laminated timber is being performed by research groups in Europe and overseas. Experimental test results are required for development of design methods and for verification of design models accuracy. This thesis focuses on the continuation of SOFIE research project which started in 2005, conducted by IVALSA Trees and Timber Research Institute (San Michele all' Adige, Trentino, Italy). The aim of this project is the development of multi-storey timber building systems using prefabricated cross-laminated panels. As several parts of Italy are earthquake-prone areas, seismic resistance of such building system has to be ensured. Thus, within the scope of the SOFIE project, an extensive experimental research on seismic resistance of X-Lam building system has been performed. The project started with performance of racking tests on wall panels with different layouts of connections and openings and pseudo-dynamic tests on a full scale one-storey building, continued with shaking table tests on a 3-storey building and on a 7-storey building, the latter one conducted at E-Defense facility in Miki, Japan. Experimental tests provided excellent outcomes, as the buildings were able to survive a series of strong recorded earthquakes, such as Kobe earthquake (1995), virtually undamaged, while at the same time demonstrating significant energy dissipation. In the scope of this thesis, an extended experimental programme on typical X-Lam connections was performed at IVALSA Research Institute. In addition, cyclic tests were carried out on full-scale single and coupled cross-lam wall panels with different configurations and mechanical connectors subjected to lateral force. The outcomes of these tests were used for evaluation of mechanical properties, ductility ratio, energy dissipation, and impairment of strength, which are all needed in seismic design and are currently not provided by codes of practice such as the Eurocode 8. In addition, analytical models to predict stiffness and strength at different building levels such as connections, wall systems and entire buildings were developed. Further, capacity design method for X-Lam buildings was introduced and was verified with extensive database of experimental results. In the capacity design, overstrength factors are needed, thus these factors were evaluated based on experimental tests on X-Lam subassemblies. Experimental results served also for calibration of advanced component FE models for non-linear static and dynamic numerical analyses of X-Lam walls and buildings, developed at the University of Trieste. Numerical analysis of X-Lam wall systems using the FE model was carried out in order to extend the results of the experimental tests to different configurations of technical interest. Outcomes of the parametric study provided better understanding of the seismic behaviour and energy dissipation capacities of X-Lam wall systems. It was concluded that the numerical and analytical models, presented in this thesis, are a sound basis for determining the seismic response of cross-laminated timber buildings. However, future research is required to further verify and improve these prediction models.
XXV Ciclo
1985
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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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Coates, Cameron Wayne. « New concepts for strength enhancement of co-cured composite single lap joints ». Diss., Georgia Institute of Technology, 2001. http://hdl.handle.net/1853/12937.

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Zhao, Xingjie. « Stress and failure analysis of adhesively bonded joints ». Thesis, University of Bristol, 1991. http://hdl.handle.net/1983/0887c1fc-95e1-4661-9992-89d424ad58d2.

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This thesis presents the results of a study into the mechanics of stresses in adhesive layer and the failure of adhesively bonded lap joints. A brief survey was made of the existing methods on the stress analysis of adhesively bonded lap joints. Following this is a discussion of the mechanics of adhesively bonded lap joints. The existence of stresses and factors affecting these stresses are presented in physical terms. A new method is presented for the determination of bending moments at the ends of the overlap for single lap joints. This method is accurate for joints with either identical or different adherends. A new procedure combining the analytical and numerical methods was proposed to obtain stresses in the adhesive layer accurately and efficiently. The reason why analytical methods yield somewhat hall the real peel stresses in the adhesive layer in double lap joints has been establis'hed. Some improvements in the determination of peel stresses in the adhesive layer in double lap joints have been made. A three dimensional stress analysis was carried out to study the stress distribution across the joint- width. An intuitive and numerical study was made into the mechanics of the longitudinal stresses in the adhesive layer. An elastic-plastic stress and strain analysis. has been performed with FEM on joints bonded with radii adherends to study the effect of the rounding of the adherend corners on the stress distribution in the adhesive layer. Some study into the failure process and failure modes were performed. Tests were made on both double and single lap joints. Finally. the failure criteria concerning strength predictions of adhesively bonded joints were reviewed. A, new criterion was proposed for the prediction of joint strength
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Livres sur le sujet "Joints with mechanical fasteners"

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Blendulf, Bengt. Mechanical fastening and joining. Independence, Ohio, U.S.A : Industrial Fastners Institute, 2012.

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American Society of Civil Engineers. Task Committee on Fasteners., dir. Mechanical connections in wood structures. New York, N.Y : American Society of Civil Engineers, 1996.

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American Institute of Steel Construction. et Industrial Fasteners Institute. Standards and Technical Practices Committee. Structural Bolting Subcommittee., dir. Mechanical fasteners for steel bridges. Chicago, Ill : AISC Marketing, 1996.

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Speck, James A. Mechanical fastening, joining, and assembly. New York : Marcel Dekker, 1997.

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Erol, Sancaktar, American Society of Mechanical Engineers. Design Engineering Division. et International Mechanical Engineering Congress and Exposition (1998 : Anaheim, Calif.), dir. Reliability, stress analysis, and failure prevention aspects of adhesive and bolted joints, rubber components, composite springs : Presented at the 1998 ASME International Mechanical Engineering Congress and Exposition, November 15-20, 1998, Anaheim, California. New York, N.Y : American Society of Mechanical Engineers, 1998.

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Institute, Industrial Fasteners, dir. The heritage of mechanical fasteners. Cleveland, OH : Industrial Fasteners Institute, 1991.

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Lameris, J. The static strength of mechanically fastened carbon-epoxy joints without bending. Amsterdam, Netherlands : National Aerospace Laboratory, 1989.

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North Atlantic Treaty Organization. Advisory Group for Aerospace Research and Development. Behaviour and analysis of mechanically fastened joints in composite structures. Neuilly sur Seine, France : AGARD, 1988.

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Potter, JM, dir. Fatigue in Mechanically Fastened Composite and Metallic Joints. 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959 : ASTM International, 1986. http://dx.doi.org/10.1520/stp927-eb.

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Design of mechanical joints. New York : M. Dekker, 1985.

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Chapitres de livres sur le sujet "Joints with mechanical fasteners"

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Josephs, Harold, et Ronald L. Huston. « Basic Concepts of Fasteners ». Dans Blake’s Design of Mechanical Joints, 11–42. Second edition. | Boca Raton : CRC Press, Taylor & Francis, 2019. | Series : Mechanical engineering | Revised edition of : Design of mechanical joints / Alexander Blake. c1985. : CRC Press, 2018. http://dx.doi.org/10.1201/9781315153827-2.

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Skorupa, Andrzej, et Małgorzata Skorupa. « Load Transfer in Lap Joints with Mechanical Fasteners ». Dans Solid Mechanics and Its Applications, 115–44. Dordrecht : Springer Netherlands, 2012. http://dx.doi.org/10.1007/978-94-007-4282-6_5.

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Javidinejad, Amir. « Fasteners and Joint Connections ». Dans Essentials of Mechanical Stress Analysis, 195–204. 2e éd. Boca Raton : CRC Press, 2023. http://dx.doi.org/10.1201/9781003311218-12.

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Matthews, F. L., et P. P. Camanho. « Stresses in Mechanical Fastened Joints ». Dans Recent Advances in Structural Joints and Repairs for Composite Materials, 67–100. Dordrecht : Springer Netherlands, 2003. http://dx.doi.org/10.1007/978-94-017-0329-1_3.

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Chang, F. K., et X. L. Qing. « Strength Determination of Mechanical Fastened Joints ». Dans Recent Advances in Structural Joints and Repairs for Composite Materials, 101–40. Dordrecht : Springer Netherlands, 2003. http://dx.doi.org/10.1007/978-94-017-0329-1_4.

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Syed, I., B. Dattaguru et A. R. Upadhya. « Remaining Life of Fastener Joints Under Bearing and Bypass Fatigue Loading ». Dans Lecture Notes in Mechanical Engineering, 203–15. Singapore : Springer Singapore, 2022. http://dx.doi.org/10.1007/978-981-16-8724-2_19.

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Richards, Keith L. « Mechanical Fasteners ». Dans Design Engineer's Sourcebook, 759–94. Boca Raton : Taylor & Francis, CRC Press, 2018. : CRC Press, 2017. http://dx.doi.org/10.1201/9781315367514-31.

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Erhard, Gunter. « Mechanical Fasteners ». Dans Designing with Plastics, 365–86. München : Carl Hanser Verlag GmbH & ; Co. KG, 2006. http://dx.doi.org/10.3139/9783446412828.009.

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Roblin, Murray J., et Anthony Luscher. « Mechanical Fasteners ». Dans Mechanical Engineers' Handbook, 286–314. Hoboken, NJ, USA : John Wiley & Sons, Inc., 2006. http://dx.doi.org/10.1002/0471777463.ch7.

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Matisoff, Bernard S. « Mechanical Fasteners ». Dans Handbook Of Electronics Packaging Design and Engineering, 122–48. Dordrecht : Springer Netherlands, 1990. http://dx.doi.org/10.1007/978-94-011-7047-5_5.

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Actes de conférences sur le sujet "Joints with mechanical fasteners"

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Eslami, Babak, Randy Ganye, Chris Bunai et Chandrasekhar Thamire. « Smart Fasteners and Their Application in Flanged Joints ». Dans ASME 2011 International Mechanical Engineering Congress and Exposition. ASMEDC, 2011. http://dx.doi.org/10.1115/imece2011-64214.

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Fasteners are widely used in many industrial applications. Their function in many cases is to provide a leak-proof joint at the flange interface. To accomplish this function, fasteners must be clamped with appropriate force. In practice, it is difficult to measure such forces, intermittently or continuously. While measurement using load cells or strain gages is an available option, it tends to be expensive or infeasible due to the constraints imposed by the application. When tightening the fasteners initially or during maintenance, a less accurate method of specifying the bolt-tightening torque for achieving the necessary bolt force is widely followed in industry. These torque values are calculated using published design correlations [1]. Many factors affect such calculations: friction between the threads and collar and flange, age of the fasteners, assumptions about rigidity of the clamped components, being a few among those. Since specific values applicable for individual application are not always be known, fasteners are often over-tightened, resulting in increased stresses in the assembly elements or under tightened, resulting in leakages at the flange interfaces. In the current paper, we introduce the concept of smart fasteners that can visually indicate the tension they are subjected to, and validate it for a widely used industrial fastener size. Results from numerical and experimental studies conducted are presented for UNC 1/2 -13 × 4 1/4″ smart fasteners. Lastly, relationship between bolt-tightening torque and color intensity of the smart fasteners is provided.
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Dechev, Nikolai, James K. Mills et William L. Cleghorn. « Mechanical Fastener Designs for Use in the Microassembly of 3D Microstructures ». Dans ASME 2004 International Mechanical Engineering Congress and Exposition. ASMEDC, 2004. http://dx.doi.org/10.1115/imece2004-62212.

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This paper describes micro-mechanical fastener designs used to create joints between surface micromachined micro-parts. This is part of ongoing research to develop a general microassembly system capable of assembling various types of microstructures. The microassembly system is based on sequential robotic operations and the use of a microgripper. Two new joint designs referred to as ‘key-lock’ joints and ‘inter-lock’ joints are introduced. Key-lock joints are created by the insertion of a ‘key’ on one micro-part, into a mating slot on another micro-part. By translating the first micro-part within the other, after the key is inserted, it becomes locked into position. Inter-lock joints are created by the perpendicular insertion of one micro-part with a slit, into another micro-part with a slit. The slits create an interference fit and are permanent once the micro-parts are joined. The design of these joints and the experimental results are detailed. In addition, ongoing work involving recent ‘snap-lock’ joint fastener designs is described. This includes an example of a 3D micro-transformer and a stacked microstructure. These various micro-mechanical fasteners demonstrate a number of ways in which micro-parts can be assembled into 3D microstructures.
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Cope, Dale, et Thomas Lacy. « Stress intensity determination in lap joints with mechanical fasteners ». Dans 41st Structures, Structural Dynamics, and Materials Conference and Exhibit. Reston, Virigina : American Institute of Aeronautics and Astronautics, 2000. http://dx.doi.org/10.2514/6.2000-1368.

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Wärmefjord, Kristina, Rikard Söderberg et Lars Lindkvist. « Variation Simulation of Dissimilar Materials Using Clip Fasteners ». Dans ASME 2016 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2016. http://dx.doi.org/10.1115/imece2016-66551.

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The use, and the joining process, of dissimilar materials have recently been highlighted. Joining of dissimilar materials can however be problematic, due to different material properties. Different materials respond differently to temperature changes and this might lead to deformations and stress in the final assembly. The joining methods differ also often from the one used to join similar material. Variation simulation is used to predict the geometrical variation of a subassembly or a final product. In variation simulation of dissimilar materials it is important to include material properties in order to achieve an accurate result. Also the effects form joining method must be included in the simulation. To join dissimilar materials like plastic and sheet metal parts, clip fasteners are often used. This paper presents a method for variation simulation of dissimilar materials with a focus on how to model clip fasteners. The method allows effects of temperature changes on holding forces and geometrical variation in the final assembly to be evaluated. Holding force refers to the force a clip fastener must withstand after the parts are joined. The method proposed can be used to support the design and selection of clip fasteners.
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Bernardin, John D., et Eugene M. Flores. « Characterization of the Torque Limits and Clamping Force Relationships for Small Stainless Steel Screws in Tensile Loaded Joints of Various Metals ». Dans ASME 2009 International Mechanical Engineering Congress and Exposition. ASMEDC, 2009. http://dx.doi.org/10.1115/imece2009-12661.

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This study originated during the design of ChemCam, a Laser Induced Breakdown Spectroscopy (LIBS) and imaging instrument being developed for NASA’s Mars Science Lab Rover. The mission needs for miniaturization, reduced weight, high reliability, minimal use of thread locking compounds, and the ability to handle harsh environmental conditions dictated the use of small, high strength screws to be threaded into a variety of metal alloys including Be-S200f, Al-6061-T6, Mg-ZK60A-T5, and Ti-6Al-4V. The lack of a credible fastener torque database for small (#0 through #8) high strength stainless steel screws in various parent materials, led to the development of an experimental program to characterize the following: a. The screw torque value versus angular rotation (which indicates yielding in the screw or parent material) as a function of screw diameter, screw head configuration, depth of thread engagement, type of parent material, type of surface treatment on parent material, presence of thread locking compound, repeatable threaded hole use, and degree of screw pedigree. b. The relationship between fastener torque and clamping force for a subset of the above mentioned variables. The database generated from this study will serve as a design reference for utilizing small stainless steel fasteners and provide trending information for other researchers who may be interested in broadening its range of parameters. This paper reviews the related fastener torque and clamping force information from the literature, describes the experimental screw torque and clamping force monitoring equipment, presents the test matrix and experimental procedures, and discusses the empirical results.
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Thomas, Frank, et Yi Zhao. « Torque Limit for Composites Joined with Mechanical Fasteners ». Dans 46th AIAA/ASME/ASCE/AHS/ASC Structures, Structural Dynamics and Materials Conference. Reston, Virigina : American Institute of Aeronautics and Astronautics, 2005. http://dx.doi.org/10.2514/6.2005-2351.

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Stephan, Melanie, Jens O. Weber, Ulrich Wuttke et Christina Berger. « Fasteners at Low Temperatures : Characterization and Methods for Design ». Dans ASME 2011 International Mechanical Engineering Congress and Exposition. ASMEDC, 2011. http://dx.doi.org/10.1115/imece2011-63570.

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Bolted joints are a major part of wind energy plants. Due to climatic conditions, they are often exposed to temperatures far below the freezing point. Together with the multiaxial state of stress, which results from the notch effect of the thread, and possible dynamic overloads during operation, sufficient ductility of the material is needed. The state of the art method to investigate the ductile behavior of fasteners is the Charpy pendulum impact test with a V-notched specimen. According to international standard DIN EN ISO 898-1 [1] respectively ASTM F568M-07 [2], fasteners made of carbon steel and alloy steel with a body centered cubic lattice structure can be used for temperatures down to 223 K (−50°C, −58°F) as long as a minimum impact energy of 27 J at 253 K (−20°C, −4°F) is met. As there are several disadvantages in using this test method for fasteners, a detailed examination of existing test methods and design concepts is necessary to find alternatives to the Charpy pendulum impact test. Extensive quasi-static and dynamic material tests were conducted on fasteners with property classes 5.6, 10.9 and 12.9 in a temperature range between 203 K (−70°C, −94°F) and room temperature 293 K (20°C, 68°F). Both mechanical properties and the influence of different specimen geometries were evaluated. Analytical concepts for the description of the low temperature applicability of different steels were analyzed.
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Robusto, Francesco, Sayed A. Nassar, Joon Ha Lee, Marco Gerini-Romagnoli et Massimiliano De Agostinis. « Effect of Using 3D Printed Parts on the Torque-Tension Relationship of Threaded Joints ». Dans ASME 2022 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2022. http://dx.doi.org/10.1115/imece2022-95614.

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Abstract This study investigates the effect of shot-peened additively manufactured aluminum parts on the torque-tension relationship of threaded joints, as compared to extruded components. Steel flange head bolts are utilized. A computer-controlled RS torque-tension system is used for tightening test joints to a target preload, and frictional data is collected at a high sampling rate. A final group of additive manufactured specimens is analyzed to evaluate the effect of machining on the tribological response of the bolted joint. The underhead friction coefficient is measured over 5 consecutive tightenings, with and without disassembly and cooldown. The bearing surface topology is analyzed using an optical profilometer after each tightening. Fasteners and parts are ultrasonically cleaned, and tests are performed with no lubrication. Cooldown between consecutive tightenings had a significant effect on the frictional characteristics of non-machined additively manufactured joints. The lower surface integrity of the 3D printed components resulted in severe damage to the bearing surface after 5 tightening operations. Discussion of the results and conclusions are provided.
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Fukuoka, Toshimichi, Masataka Nomura et Yusuke Takasugi. « Evaluation of Thermal and Mechanical Behaviors of Bolted Joints Made of Titanium and Titanium Alloy and its Application to Robust Joint Design ». Dans ASME 2013 Pressure Vessels and Piping Conference. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/pvp2013-97156.

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Titanium and titanium alloys have some excellent characteristics when used for the parts and components of machines and structures. As for bolted joints, however, they are limitedly used mainly due to the high cost. Its specific characteristics, e.g., low weight and high resistance to corrosion, are highly attractive from the engineering point of view. In this paper, thermal and mechanical behaviors of the bolted joints made of titanium or titanium alloy are comprehensively evaluated by finite element analysis, aiming at its broader use by utilizing the distinctive features of small coefficient of linear expansion and Young’s modulus. As a first step, thermal contact coefficients at the interface composed of titanium, titanium alloys and other engineering materials are measured, and then the empirical equations for evaluating the coefficients are derived in the same form proposed in the previous papers. In the next place, numerical analyses are executed by incorporating the thermal contact coefficients into the finite element formulation. Numerical results suggest that threaded fasteners made of titanium alloys are favorably applied to the joints whose clamping forces are likely to decrease when subjected to thermal load. It was also found that the aforementioned threaded fasteners are effective, owing to its low Young’s modulus, for reducing the stress amplitude generated by alternating external forces.
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Croccolo, D., M. De Agostinis et N. Vincenzi. « Experimental Analysis on the Tightening Torque - Preloading Force Relationship in Threaded Fasteners ». Dans ASME 2010 International Mechanical Engineering Congress and Exposition. ASMEDC, 2010. http://dx.doi.org/10.1115/imece2010-37153.

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The aim of this study is to provide an experimental methodology useful to determine the friction coefficients in bolted joints and, therefore, to relate precisely the tightening torque to the preloading force. The components under investigation are some clamped joints made of aluminium alloy and used in front motorbike suspensions to connect the steering plate (fork) to the legs and the legs to the wheel pin. The aluminium alloy is realised by a casting or a forging process afterwards anodized or spry-painted in surface. Some specific specimens have been appropriately designed and realised with the same process of the actual components. The bolt torque is given by a torque wrench whereas the preloading force has been evaluated by means of a strain gauge. Thread and underhead friction coefficients have been studied separately, by applying an axial bearing located between the bolt head and the flange of the specimen. The overall friction coefficient and the torque coefficient (nut factor) have been calculated. Experimental tests have been carried out by applying the Design of Experiment (DOE) method in order to obtain an accurate mathematical model that involves the significant friction variables and their interactions. The results of this preliminary study have been, then, applied to those connections used in front motorbike suspensions to lock the steering plates with the legs and the legs with the wheel pin, by means of one or two bolts. The preloading force, produced during the tightening process, should be evaluated accurately, since it must lock safely the shaft, without overcoming the yielding point of the hub. Firstly, the applied tightening torque has been precisely related to the imposed preloading force by means of the friction coefficients definition. The tensile state of clamps, have been evaluated both via FEM and by leveraging some design formulae proposed by the Authors as functions of the preloading force and of the clamp geometry. Finally the results have been compared to those given by some strain gauges applied on the tested clamps: the discrepancies between numerical analyses, design formulae and experimental results remains under a threshold of 10%.
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Rapports d'organisations sur le sujet "Joints with mechanical fasteners"

1

Groom, Leslie H., et [Compiler]. Current and Future Applications of Mechanical Fasteners for Light-Frame Wood Structures : Proceedings of Mechanical Fasteners Plenary Session at the Forest Products Research Society Annual Meeting. New Orleans, LA : U.S. Department of Agriculture, Forest Service, Southern Forest Experiment Station, 1993. http://dx.doi.org/10.2737/so-gtr-92.

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SEGALMAN, DANIEL J. An Initial Overview of Iwan Modeling for Mechanical Joints. Office of Scientific and Technical Information (OSTI), mars 2001. http://dx.doi.org/10.2172/780307.

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Baker, B. R. Fabrication and Mechanical Testing of Small-Scale Adhesive-Bonded High Explosive (HE) Joints. Office of Scientific and Technical Information (OSTI), décembre 2018. http://dx.doi.org/10.2172/1490923.

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Baker, B. R. Fabrication and Mechanical Testing of Block Shear Joints to Measure Ultimate Shear Strength in Adhesive-Bonded High Explosive (HE) Joints (Progress Summary). Office of Scientific and Technical Information (OSTI), mars 2019. http://dx.doi.org/10.2172/1524741.

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Hernandez, C. L., P. T. Vianco et J. A. Rejent. Effect of interface microstructure on the mechanical properties of Pb-free hybrid microcircuit solder joints. Office of Scientific and Technical Information (OSTI), août 1998. http://dx.doi.org/10.2172/676869.

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Yamanouchi, N., et K. Shiba. Mechanical properties and microstructure of F-82H welded joints using CO{sub 2} laser beam. Office of Scientific and Technical Information (OSTI), octobre 1996. http://dx.doi.org/10.2172/414874.

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Han, Li, Ken William Young, Richard Hewitt et Andreas Chrysanthou. The Effect of Breakthrough on the Mechanical Behavior of Self-Piercing Riveted Aluminum 5754-HSLA Joints. Warrendale, PA : SAE International, mai 2005. http://dx.doi.org/10.4271/2005-08-0203.

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Doyle, Jesse D., Nolan R. Hoffman et M. Kelvin Taylor. Aircraft Arrestor System Panel Joint Improvement. U.S. Army Engineer Research and Development Center, août 2021. http://dx.doi.org/10.21079/11681/41342.

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Aircraft Arresting Systems (AAS) for military applications utilize sacrificial panels made of Ultra-High Molecular Weight polyethylene (UHMWPE) that are embedded into the pavement beneath the AAS cable to protect the pavement from cable damage. Problems have been observed with the materials and practices used to seal the UHMWPE panel joints from water and debris. Data obtained from laboratory and field studies were used make improvements to current practice for sealing UHMWPE panel joints. The study evaluated four joint-sealant materials, eight alternative surface treatment and preparation techniques to promote adhesion to UHMWPE, and seven joint-edge geometries. Bond-strength testing of joint-sealant specimens was conducted in the laboratory, followed by field evaluation of construction techniques. Field performance of the joint systems was monitored for 24 months after installation. Additionally, a thermal response model was developed to refine the joint design dimensions. Results confirmed that the best material to use was self-leveling silicone joint sealant. It was recommended that a dovetail groove be cut into the edge of UHMW panels to provide positive mechanical interlock and to reduce adhesive failures of the sealant. It was also recommended that the panel-to-panel joint-sealant reservoir be widened to prevent sealant compression damage.
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Attachment of Steel Decking using Mechanical Fasteners and Powder Actuated or Pneumatic Tools. Purdue University, 2007. http://dx.doi.org/10.5703/1288284315801.

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MECHANICAL PERFORMANCE OF WELDED HOLLOW SPHERICAL JOINTS AT ELEVATED TEMPERATURES. The Hong Kong Institute of Steel Construction, mars 2020. http://dx.doi.org/10.18057/ijasc.2020.16.1.1.

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