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Gotowe bibliografie tematyczne / Fatigue mecanique en traction

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Gotowa bibliografia na temat „Fatigue mecanique en traction”

Autor: Grafiati

Data publikacji: 8 lipca 2023

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Artykuły w czasopismach na temat "Fatigue mecanique en traction"

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Isalgué, Antonio, Javier Fernández, Nuria Cinca, I. G. Cano, Ramón Grau, Carlota Auguet i Vicenç Torra. "Thermomechanical Fatigue Behavior of NiTi Wires". Materials Science Forum 738-739 (styczeń 2013): 311–15. http://dx.doi.org/10.4028/www.scientific.net/msf.738-739.311.

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Applications of the functional, smart materials SMA need a careful evaluation of the working conditions and fatigue life. Structural fatigue failure in NiTi usually comes from a surface defect inducing crack growth, and this means that fatigue has to be studied for concrete applications, with the correct samples, as the state of the material presents size effects. Testing machine experiments on Ni-rich pseudoelastic wires indicate that the main parameter controlling the fatigue life in the traction-traction experiments is the effective stress on the NiTi wire. Long wire life (in the million cycle regime) can be achieved under limited stresses (under 170 MPa) in traction-traction tests. Also, experiments have been done on thermal actuation of NiTi wire under traction at constant load. Long actuator life (larger than 400000 cycles) can be achieved at low stresses (around 100 MPa), coherently with the results from the mechanical cycling.

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Xiang, Hui Yu, Zhi Qiang Li, Chong Jie Leng i De Mao Hu. "Fatigue Analysis of the Rotor Shaft on a High Speed Traction Motor". Advanced Materials Research 482-484 (luty 2012): 722–25. http://dx.doi.org/10.4028/www.scientific.net/amr.482-484.722.

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Rotor shaft is an important part in the high speed traction motor. In the process of the motor running，some rotor shaft may show the symptoms of fatigue crack，fracture and other issues．Therefore，it is essential to analyze its fatigue condition for these potential problems in the product design stage．In this paper，finite element analysis software NX. Nastran is used to analyzing the rotor shaft of traction motor from structural strength，fatigue strength and fatigue life respectively．The fatigue damage area and dangerous zone of the rotor shaft as well as its fatigue life can be predicted according to the simulation results，and which could provide a critical review for the following study and structural design of the traction motor．

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Lin, Zhi Jia, i Ming Ye Zhang. "Fatigue Analysis for Traction Transformers during Random Vibration". Advanced Materials Research 1079-1080 (grudzień 2014): 364–67. http://dx.doi.org/10.4028/www.scientific.net/amr.1079-1080.364.

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Traction transformers areheavy and suffering dynamic load all the time when the train is starting,stopping and moving. These load cases make it necessary to design tractiontransformers in fatigue resistance view. In this paper, random vibrationsimulation is done for traction transformer with finite element method. ThisFEM result is used for fatigue analysis. Several methods of damage accumulationfor random vibration are discussed and compared with test result. Result showssingle moment method is a better choice for traction transformers.

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Yang, Haibo, Hongliang Qian, Ping Wang i Pingsha Dong. "Analysis of fatigue behavior of welded joints in orthotropic bridge deck using traction structural stress". Advances in Mechanical Engineering 11, nr 11 (listopad 2019): 168781401989021. http://dx.doi.org/10.1177/1687814019890217.

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In this study, the fatigue behavior of welded joints in an orthotropic steel bridge is simulated and analyzed. The traction structural stress method is proven to be more accurate and effective, and the predicted results agree well with the test results compared to traditional assessment methods, including the nominal stress, hot-spot stress, and effective notch stress methods. The traction structural stress concentration factor curves of welded joints under cyclic tensile and bending moment loading are obtained. The accuracy and validity of finite-element simulation methods for welded joints in orthotropic steel bridge are verified by comparing simulation results with full-scale tests results. Equivalent nominal stresses predicted by the master S–N curve method based on traction structural stress results agree well with the fatigue test results with small standard deviation. The fatigue behavior of orthotropic steel bridge analysis specifications Eurocode3 and GB50017 is combined with the traction structural stress method using unified traction structural stress concentration factor curves. This approach provides practical guidance for the fatigue behavior design of orthotropic steel bridges.

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Seo, Jung Won, Hyun Mu Hur, Sung Tae Kwon, Jae Boong Choi i Young Jin Kim. "Effects of Residual Stress and Traction Force on the Contact Fatigue Life of Railway Wheels". Key Engineering Materials 326-328 (grudzień 2006): 1067–70. http://dx.doi.org/10.4028/www.scientific.net/kem.326-328.1067.

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Damage often occurs on the surface of railway wheels due to wheel-rail contact fatigue. Since the wheel failure can cause derailment causing the loss of life and property, it should be removed prior to the wheel failure. The effect of surface removal on contact fatigue life has been investigated by many researchers, however, the effects of residual stress and traction force have not been reported yet. The railway wheel reserves the initial residual stress due to the manufacturing process, and this residual stress is changed by the thermal stress induced by braking. Also, the traction force is usually applied along with residual stress on wheels of locomotive and electric motor vehicle. In this study, the effect of surface removal on the contact fatigue life for a railway wheel has been evaluated by applying the rolling contact fatigue test. Also, the effect of traction force and change of residual stress on the contact fatigue life has been estimated by applying finite element analysis. It is found that the residual stress is a dominant factor determining the surface removal depth as far as the traction coefficient is less than 0.15. If the traction coefficient is greater than 0.2, however, the surface removal depth is observed to be independent on the residual stress.

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Lee, Dong Hyong, Jung Won Seo i Seok Jin Kwon. "Numerical Analysis of the Effect of Slip Ratio on the Fatigue Crack Initiation Life in Rolling Contact". Advanced Materials Research 891-892 (marzec 2014): 1791–96. http://dx.doi.org/10.4028/www.scientific.net/amr.891-892.1791.

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This paper presents a numerical analysis of the effect of slip ratio on the fatigue crack initiation life, considering the tangential traction on the rolling contact surface. The distribution of tangential traction and contact stresses on the contact surface, when rolling contact occurs between two cylindrical test specimens, are obtained using three-dimensional finite element analysis. The effect of slip ratio on the fatigue crack initiation life was evaluated by applying multiaxial fatigue criteria based on critical plane approaches. As a result, the 3D-FE model developed well represent the distribution of tangential traction and contact stresses on the contact surface at stick-slip condition, which is differ from the static or full sliding contact condition. As the slip ratio increases, the maximum tangential traction also increases in slip zone and the location of maximum stress closer to the contact surface in stick zone. The fatigue strength decreased with the increase in the slip ratio. Therefore, it is clear that the slip ratio has an important role in prediction of fatigue crack initiation life on the rolling contact surface.

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Nikas, George K. "Fatigue Life and Traction Modeling of Continuously Variable Transmissions". Journal of Tribology 124, nr 4 (24.09.2002): 689–98. http://dx.doi.org/10.1115/1.1491976.

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A model was developed to study the elastohydrodynamics and contact mechanics of toroidal Continuously Variable Transmission (CVT) type contacts. The aim is to predict the fatigue life, traction and efficiency of such contacts with the intention of making optimizations based on design criteria and constraints. A generalized Reynolds equation was developed for isothermal, transient lubrication of elliptical rough contacts with mixed rolling, two-dimensional sliding, and spinning conditions, incorporating any non-Newtonian model, roughness asperity isothermal elastoplastic interactions, and a three-dimensional subsurface stress analysis. The output is in the form of film thickness and traction maps, including contact efficiency, three-dimensional stress fields, and, finally, the predicted fatigue lives of CVT contacts, based on the Ioannides-Harris life model. A parametric study reveals the effect of surface roughness, lubricant bulk temperature, contact ellipticity ratio, slide-roll ratio, and contact load on the fatigue life, traction and contact efficiency of CVTs, and allows for design optimizations based on a compromise between life, traction and efficiency.

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Yang, Haibo, Ping Wang i Hongliang Qian. "Analysis of Fatigue Performance of U-Rib to Deck Connections in Orthotropic Steel Bridge Structures". MATEC Web of Conferences 319 (2020): 07001. http://dx.doi.org/10.1051/matecconf/202031907001.

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The stress condition of the transverse rib, bridge deck, and crossbeam in orthotropic steel bridge decks (OSBD) is complicated. Existing fatigue test specimens and the fatigue performance of components in OSBD differ significantly. In this paper, the numerical analysis method using traction structural stress is validated by the comparison with fatigue test results. The evaluation results of the fatigue behavior using the traction structural stress method are proven to be accurate. The comparative results give the fatigue performance of various types of typical test specimens in terms of the equivalent structural stress and initiation locations.

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Ouaki, B., S. Goudreau, A. Cardou i M. Fiset. "Fretting fatigue analysis of aluminium conductor wires near the suspension clamp: Metallurgical and fracture mechanics analysis". Journal of Strain Analysis for Engineering Design 38, nr 2 (1.02.2003): 133–47. http://dx.doi.org/10.1243/030932403321163668.

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Fretting fatigue is the main phenomenon inducing reduction of fatigue strength in overhead transmission conductor lines which are subjected to aeolian vibrations. Using the Bersfort ACSR 48/7 conductor, fatigue tests were conducted under several traction forces and relative vibration amplitudes. By metallographic examinations it has been observed that fretting induces microcracks which are mainly located between the keeper edge (KE) and the last point of the contact (LPC) of the conductor at the mouth of the suspension clamp. Under the fatigue tests conditions, several cross-sections of wires in the external layer of the conductor were instrumented using strain gauges. Wire strains recorded near to the suspension clamp show that the alternating strains were predominantly traction strains near the KE and that bending alternating strains become significant near the LPC. On the basis of fatigue tests results and assuming some simplified hypothesis, stress intensity factors were computed at the tip of cracks. The computed stress intensity factors take into account the combined effect of fretting behaviour at the contact points and both traction and bending stresses. The computed stress intensity factor ranges for low fatigue bending vibration amplitudes show good agreement with the endurance limit of the conductor.

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Risitano, Antonino, Carmelo Clienti i Giacomo Risitano. "Determination of Fatigue Limit by Mono-Axial Tensile Specimens Using Thermal Analysis". Key Engineering Materials 452-453 (listopad 2010): 361–64. http://dx.doi.org/10.4028/www.scientific.net/kem.452-453.361.

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In this work is indicated how it could be possible to evaluate the limit stress of the thermo-elastic phase of deformation by thermo-analysing the surface of the specimen during a static traction test. Adding the temperature curve measured on a small area of the surface (the hottest) to the classic stress-strain curve, it is possible to evaluate a limit temperature T0 coincident with the beginning of the non linear trend of the curve. The corresponding stress value is coincident with the fatigue limit of the analyzed component. As an example, the results of traction tests performed on two notched specimens, where the change of linearity in the temperature curve during static traction test was evident, are reported.

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Rozprawy doktorskie na temat "Fatigue mecanique en traction"

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Forestier, Jean-Paul. "Caracterisation de l'interface composite de collage / attaches orthodontiques". Paris 7, 1997. http://www.theses.fr/1997PA07GA03.

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MEKIRI, LLIES. "Contribution a l'etude du comportement mecanique fin de l'assemblage a simple recouvrement du type sifflet sollicite en traction simple et en fatigue". Paris 6, 1991. http://www.theses.fr/1991PA066576.

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Le travail consiste, a analyser le comportement mecanique d'un assemblage colle a simple recouvrement du type sifflet, sollicite a la traction simple et a la fatigue. L'etude experimentale utilise, en simultane l'extensometrie a jauges electriques et l'emission acoustique. Ces deux techniques nous ont permis de localiser avec precision l'amorcage des microfissures dans le joint, ainsi que leur seuil d'apparition. En fatigue, nous montrons que le seuil d'apparition des premieres microfissures, dans le joint correspond a la limite de fatigue de l'assemblage. Nous avons aussi montre que la traction ondulee modifie la repartition des contraintes dans le joint, qui dans certains cas entraine une meilleure resistance du corps d'epreuve. Un calcul par elements finis, donne la repartition des contraintes dans la colle. Ces resultats sont confrontes a ceux de nos essais, ainsi qu'a ceux des calculs proposes dans la litterature. Cette comparaison montre qu'on obtient une bonne adequation lorsqu'on se place loin des extremites du joint

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Halfaoui, Saddek. "Contribution a l'etude de l'influence de la rugosite des subjectiles sur la resistance mecanique en traction et en fatigue de l'assemblage colle a simple recouvrement en sifflet". Paris 6, 1992. http://www.theses.fr/1992PA066502.

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Nous recherchons l'influence de l'etat de surface des subjectiles des substrats de l'assemblage colle a simple recouvrement en biseau, sur son comportement mecanique fin lorsqu'il est sollicite en traction simple et en fatigue par traction ondulee. Au cours de son endommagement, nous localisons, en utilisant simultanement l'extensometrie a jauges electriques et l'emission acoustique, l'amorcage, la croissance, le developpement des microfissures et des criques, tout le long du recouvrement et pendant toute la duree de vie de l'eprouvette. En appliquant plusieurs sables sur les subjectiles prealablement rectifies, nous avons defini la rugosite optimale pour laquelle les qualites de mouillabilite, et la resistance mecanique a la traction et a la fatigue sont les meilleures. Une analyse simplifiee du comportement elastique du joint a ete elaboree en faisant intervenir un correcteur d'extremite. Nos resultats montrent qu'il existe une adequation satisfaisante avec l'experience

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Veys, Jean-Marie. "Contribution a l'etude de l'influence des revetements protecteurs sur les proprietes mecaniques des superalliages pour aubes cmsx-2 et cotac 784". Poitiers, 1987. http://www.theses.fr/1987POIT2203.

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Etude sur les systemes cmsx-2/al-ni, cmsx2/nicocralyta et cotac784/nicocralyta. Influence des parametres tels que: diffusion support-revetement, microstructure, comportement mecanique des revetements sur les proprietes de traction, fluage et fatigue des substrats

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Renault, Michel. "Tolerance a l'endommagement de composites carbone-resine et stratifies t300-914". Paris, ENMP, 1988. http://www.theses.fr/1988ENMP0109.

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Etude experimentale (essais de fatigue, essais de traction, de compression) sur des eprouvettes entaillees ou non, trouees ou non de stratifies resine epoxyde/carbone. Analyse mathematique avec des calculs par elements finis

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Bouraoui, Chokri. "Fiabilite mecanique et analyse a la fatigue des tuyauteries". Paris 6, 1993. http://www.theses.fr/1993PA066520.

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La fiabilite mecanique peut etre une approche interessante pour juger de la securite d'installations industrielles et en particulier du degre de confiance que l'on peut accorder a des structures dimensionnees selon les regles traditionnelles. Ainsi, la tenue en fatigue d'une ligne de tuyauterie est sensiblement perturbee par les dispersions aleatoires des caracteristiques mecaniques et geometriques de la structure. A temperature elevee, en plus des consequences de l'effet de ressort, l'aspect aleatoire des positions des supports dans leur intervalle de tolerance joue un role particulier. En effet, dans une ligne de tuyauterie, les conditions aux limites sont definies par la presence des supports qui assurent, d'une part, le maintien de la ligne et, d'autre part, limitent les contraintes et les deformations de tous les composants de la ligne. Ces supports sont definis par leurs positions nominales et par l'intervalle de tolerance de leur positionnement. La tolerance de positionnement de ces supports obeit couramment a une regle dite regle de l'art; pour un diametre donne, elle est constante le long de la tuyauterie. L'application de cette regle peut dans certains cas critiques engendrer une probabilite de ruine de l'installation assez inquietante. On montre que, plus un support s'approche d'un coude plus le risque de ruine est important. Le but de ce travail est de mettre en evidence ces cas critiques, d'ameliorer la regle habituellement utilisee en y introduisant des parametres supplementaires, de facon a ce que la probabilite de ruine ne depende plus de la position du support, et d'associer a l'ensemble de cette analyse une demarche probabiliste. Plus precisement, notre etude a ete faite sur une ligne de tuyauterie realiste travaillant sous un chargement cyclique secondaire. La demarche consiste a faire une analyse deterministe en premier lieu puis une etude fiabiliste en deuxieme lieu. Une generalisation s'ensuit, pour donner a ce travail un caractere d'interet pratique pour une vaste exploitation industrielle

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ZENATI, ABDELKADER. "Contribution a l'etude du comportement mecanique d'isolants thermiques : fatigue-fluage". Paris 6, 1990. http://www.theses.fr/1990PA066361.

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Cette recherche presente une analyse du comportement mecanique dans le temps de differents isolants thermiques de batiment notamment des plastiques alveolaires rigides. Apres un apercu sur le phenomene de fluage et les facteurs dont il depend, l'accent est mis sur le caractere particulier des isolants thermiques. L'influence relative des parametres temps, temperature et contrainte est etudiee par voie experimentale. Il a fallu concevoir des dispositifs d'essai specifiques. Les equipements necessaires ont ete realises, puis testes de maniere a verifier le choix des parametres d'essai et a definir une methodologie. Une serie d'essais vise a essayer d'utiliser le principe d'equivalence des effets du temps et de la temperature, de maniere a pouvoir predire le fluage a long terme par des essais de courte duree. Une autre serie d'essais consiste en l'etude du fluage en temps reel en compression et cisaillement. La recherche d'une loi de modelisation permettant une extrapolation a long terme conduit a l'observation que le fluage est du type parabolique. Le comportement des isolants thermiques en fatigue en traction et en compression est aborde. Apres un apercu sur le phenomene de fatigue, le chapitre experimentation traite des conditions d'essais pour lesquelles ont ete concues et realisees des machines de fatigue specifiques. Au chapitre exploitation des resultats sont presentes, le traitement statistique et probabiliste des resultats d'essais et la representation mathematique de la courbe de wohler. Enfin il sera aborde l'evolution du dommage en fatigue subi par l'eprouvette et sa verification vis-a-vis de la regle de miner

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LU, CHUMING. "Etude du comportement mecanique et des mecanismes d'endommagement des elastomeres en fatigue et en fissuration par fatigue". Paris, CNAM, 1991. http://www.theses.fr/1991CNAM0135.

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L'objet de ce travail est l'etude du comportement et des mecanismes d'endommagement des elastomeres en sollicitations monotone et cyclique, et de la fissuration en fatigue. L'influence de la temperature sur la rigidite des elastomeres est etudiee. La tenacite des elastomeres est presentee par l'energie de dechirement et est caracterisee par la methode multi-echantillon. Des essais de fatigue effectues a differentes temperatures permettent de connaitre les differentes proprietes des elastomeres et de predire leur resistance a la fatigue. La duree de vie est presentee en fonction de trois parametres: la contrainte, la deformation et l'energie d'hysteresis. Une excellente correlation existe entre la resistance a la fatigue et l'energie dissipee pour les trois elastometres. L'influence du rapport de charge r sur la fissuration en fatigue est egalement etudiee. L'etude fractographique et la radiographie aux rayons x permettent de mieux comprendre les mecanismes d'endommagement des elastomeres sous sollicitation monotone et cyclique

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JOYARD, NICOLAS. "Pathologie mecanique de la charniere occipito-cervicale : le grippage articulaire occipito-atloido-axoidien ; son traitement par traction axiale manuelle". Lyon 1, 1992. http://www.theses.fr/1992LYO1M261.

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NI, JINGANG. "Etude du comportement mecanique et des mecanismes d'endommagement des alliages en fatigue vibratoire". Paris, CNAM, 1991. http://www.theses.fr/1991CNAM0134.

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L'objectif de ce travail est de mettre au point une methode pour etudier l'endurance et la fissuration des materiaux sollicites en fatigue vibratoire (f=20 khz). L'eprouvette vibre a sa frequence propre de resonance en premier mode longitudinal, ayant un ventre de deformation au centre et un ventre de deplacement a l'extremite de l'eprouvette. Deux types d'eprouvettes destinees respectivement aux etudes de l'endurance et de la fissuration sont determines analytiquement utilisant la theorie de la propagation des ondes elastiques et numeriquement avec la methode des elements finis. La deformation maximale a ete mesuree au moyen de jauges d'extensometrie dynamiques. Un systeme de video-camera permet le suivi de l'evolution de la propagation de la fissure. Le mecanisme de l'amorcage et de la fissuration a ete etudie par microscopie electronique a balayage. Les alliages astroloy, u500, 17-4ph, ta6v et al-li 8090 ont ete etudies en fatigue vibratoire et en fatigue conventionnelle

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Książki na temat "Fatigue mecanique en traction"

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Deformation and fracture mechanics of engineering materials. Wyd. 3. New York: Wiley, 1989.

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Deformation and fracture mechanics of engineering materials. Wyd. 4. New York: J. Wiley & Sons, 1996.

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Hertzberg, Richard W. Deformation and fracture mechanics of engineering materials. Wyd. 3. New York: Wiley, 1989.

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Części książek na temat "Fatigue mecanique en traction"

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Wu, Chenglin, Rui Huang i Kenneth M. Liechti. "Direct and Simultaneous Extraction of Mixed-Mode Traction-Separation Relations". W Fracture, Fatigue, Failure and Damage Evolution, Volume 7, 79–84. Cham: Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-62831-8_11.

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Shakya, Hemlata, i Shiru Sharma. "Analysis of Neck Muscle Fatigue During Cervical Traction Treatment Using Wireless EMG Sensor". W Smart Computational Strategies: Theoretical and Practical Aspects, 153–62. Singapore: Springer Singapore, 2019. http://dx.doi.org/10.1007/978-981-13-6295-8_13.

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Seo, Jung Won, Hyun Mu Hur, Sung Tae Kwon, Jae Boong Choi i Young Jin Kim. "Effects of Residual Stress and Traction Force on the Contact Fatigue Life of Railway Wheels". W Experimental Mechanics in Nano and Biotechnology, 1067–70. Stafa: Trans Tech Publications Ltd., 2006. http://dx.doi.org/10.4028/0-87849-415-4.1067.

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Rajan, Sreehari, Michael A. Sutton, William McMakin, Mike Steinzig, Laura Inkret, Elsa Compton i Amanda Olsen. "Mode I Traction-Separation Relationship of Sylgard 184: Aluminum Interface Using Rigid Double Cantilever Beam Analysis". W Challenges in Mechanics of Time Dependent Materials, Fracture, Fatigue, Failure and Damage Evolution, Volume 2, 47–52. Cham: Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-030-29986-6_8.

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Lewis, S. R., i R. S. Dwyer-Joyce. "Effect of contaminants on wear, fatigue and traction". W Wheel–Rail Interface Handbook, 437–55. Elsevier, 2009. http://dx.doi.org/10.1533/9781845696788.1.437.

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Gautier, E., A. Simon et i G. Beck. "Etude du Comportement Mecanique associe a la Transformation Martensitique d'Alliages de Type Fe-Ni-C Sollicites en Fluage ou en Traction". W Strength of Metals and Alloys (ICSMA 7), 569–74. Elsevier, 1985. http://dx.doi.org/10.1016/b978-0-08-031642-0.50101-x.

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Nakajima, Akira, i Toshifumi Mawatari. "Rolling Contact Fatigue Life of Bearing Steel Rollers Lubricated with Low Viscosity Traction Oil". W Life Cycle Tribology, 351–62. Elsevier, 2005. http://dx.doi.org/10.1016/s0167-8922(05)80037-9.

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Matsuo, K., S. Saeki, Y. Ooue i A. Yoshida. "Paper XVI (iv) Effect of Traction Fluid on Rolling Contact Fatigue Life of Thermally Refined Steel". W Vehicle Tribology, 445–50. Elsevier, 1991. http://dx.doi.org/10.1016/s0167-8922(08)70162-7.

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Makhloufi, Abderahman, Younes Aoues, Abdelkhalak El Hami, Bouchaib Radi, Philippe Pougnet i David Delaux. "Study on the Thermomechanical Fatigue of Electronic Power Modules for Traction Applications in Electric and Hybrid Vehicles (IGBT)". W Reliability of High-Power Mechatronic Systems 1, 213–51. Elsevier, 2017. http://dx.doi.org/10.1016/b978-1-78548-260-1.50010-8.

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Bogdański, S. "Finite Element Modelling of Surface Fatigue Crack in EHD Contact". W Elastohydrodynamics - '96 Fundamentals and Applications in Lubrication and Traction, Proceedings of the 23rd Leeds-Lyon Symposium on Tribology held in the Institute of Tribology, Department of Mechanical Engineering, 325–36. Elsevier, 1997. http://dx.doi.org/10.1016/s0167-8922(08)70462-0.

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Streszczenia konferencji na temat "Fatigue mecanique en traction"

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Kato, Masana, Gang Deng, Masashi Yamanaka, Ryoji Yamamoto, Noboru Ono i Katsumi Inoue. "Fatigue Failure and Strength Evaluation of Traction Drive Rollers". W ASME 2000 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. American Society of Mechanical Engineers, 2000. http://dx.doi.org/10.1115/detc2000/ptg-14377.

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Abstract The surface fatigue failures of the traction drive rollers are different to that of gears and bearings because of the high traction force, skew and small slip ratio. In this research, fatigue tests of traction rollers were performed in different slip ratios and skew angles. The effects of running conditions on the fatigue lives of traction drive rollers are clarified and explained based on the surface crack growth and wear situations. Although a higher slip ratio will make a lower fatigue life, the fatigue strength will increase inversley under the skew conditions, because of the differences in mechanical and tribological condition for surface crack growth and the severe surface wear, which diminishes the surface crack length. For evaluation of the effects of such as slip ratio and skew on the fatigue strength of traction rollers, a new method is put forward in which the relationship between the surface temperature index and fatigue life is used instead of S-N curve.

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Malgar, D., N. Venkatram i N. G. S. Udupa. "Investigation of fatigue behaviour of traction gear box gears". W National Conference on Challenges in Research & Technology in the Coming Decades National Conference on Challenges in Research & Technology in the Coming Decades (CRT 2013). Institution of Engineering and Technology, 2013. http://dx.doi.org/10.1049/cp.2013.2528.

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Ding, Jie, Ping Zhang i Jianghong Li. "Fatigue life prediction of IGBT module for metro vehicle traction converter based on traction calculation". W 2015 IEEE 11th International Conference on Power Electronics and Drive Systems. IEEE, 2015. http://dx.doi.org/10.1109/peds.2015.7203578.

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Amaro de Oliveira, Lucas, i Mauricio Donadon. "Fatigue-Driven Delamination Modelling Using a Linear-Polynomial Traction-Separation Law". W 7th International Symposium on Solid Mechanics. ABCM, 2019. http://dx.doi.org/10.26678/abcm.mecsol2019.msl19-0077.

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Ghodrati, Mohamad, Mehdi Ahmadian i Reza Mirzaeifar. "Studying the Effect of Tangential Forces on Rolling Contact Fatigue in Rails Considering Microstructure". W 2019 Joint Rail Conference. American Society of Mechanical Engineers, 2019. http://dx.doi.org/10.1115/jrc2019-1279.

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In this paper, the micro-mechanical mechanisms behind the initiation and propagation of rolling contact fatigue (RCF) damages caused by the large traction forces are investigated. This study provides a three-dimensional (3D) model for studying the rolling contact fatigue in rails. Since rolling contact fatigue is highly dependent on the rail’s steel microstructure behavior, a proper 3D approach to capture the microstructure- and orientation-dependent mechanical behavior is required. A precise material model known as crystal plasticity is used for this purpose. Additionally, a cohesive zone approach is implemented to capture the crack initiation and propagation at the grain boundaries. Using the 3D finite element model which is developed for this study, we evaluate the effect of various parameters such as traction forces along the rail, and also the normal forces on the RCF response. The results reveal that the RCF cracks initiate slightly below the rail surface. These cracks start propagating toward the rail surface when the contact force is applied in repeated load cycles. The results also indicate that the depth at which RCF initiates depends on the ratio between the longitudinal traction forces and the normal loads. With larger traction forces, the cracks initiate closer, or at the rail surface, whereas larger normal loads promote the cracks initiation beneath the surface.

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Tan, Qin, i Qiang Li. "Structural strength analysis and fatigue life prediction of traction converter box in high-speed EMU". W Seventh International Conference on Electronics and Information Engineering, redaktor Xiyuan Chen. SPIE, 2017. http://dx.doi.org/10.1117/12.2265471.

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O'Keefe, M., i A. Vlahinos. "Impacts of cooling technology on solder fatigue for power modules in electric traction drive vehicles". W 2009 IEEE Vehicle Power and Propulsion Conference (VPPC). IEEE, 2009. http://dx.doi.org/10.1109/vppc.2009.5289717.

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Ghodrati, Mohamad, Mehdi Ahmadian i Reza Mirzaeifar. "Investigating the Rolling Contact Fatigue in Rails Using Finite Element Method and Cohesive Zone Approach". W 2018 Joint Rail Conference. American Society of Mechanical Engineers, 2018. http://dx.doi.org/10.1115/jrc2018-6183.

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A micromechanical-based 2D framework is presented to study the rolling contact fatigue (RCF) in rail steels using finite element method. In this framework, the contact patch of rail and wheel is studied by explicitly modeling the grains and grain boundaries, to investigate the potential origin of RCF at the microstructural level. The framework incorporates Voronoi tessellation algorithm to create the microstructure geometry of rail material, and uses cohesive zone approach to simulate the behavior of grain boundaries. To study the fatigue damage caused by cyclic moving of wheels on rail, Abaqus subroutines are employed to degrade the material by increasing the number of cycles, and Jiang-Sehitoglu fatigue damage law is employed as evolution law. By applying Hertzian moving cyclic load, instead of wheel load, the effect of traction ratio and temperature change on RCF initiation and growth are studied. By considering different traction ratios (0.0 to 0.5), it is shown that increasing traction ratio significantly increases the fatigue damage. Also by increasing traction ratio, crack initiation migrates from the rail subsurface to surface. The results also show that there are no significant changes in the growth of RCF at higher temperatures, but at lower temperatures there is a measurable increase in RCF growth. This finding correlates with anecdotal information available in the rail industry about the seasonality of RCF, in which some railroads report noticing more RCF damage during the colder months.

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Yamanaka, Masashi, Kazuhiko Kishi, Katsumi Inoue, Masana Kato, Tomoya Masuyama, Kunihiko Morikawa i Mikio Nagahara. "Evaluation of Pitting Life of Carburized Gears Lubricated by ATF and Traction Oil". W ASME 2000 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. American Society of Mechanical Engineers, 2000. http://dx.doi.org/10.1115/detc2000/ptg-14374.

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Abstract This paper presents the result of fatigue tests carried out with an ATF and two types of traction oil. Since the performance of these oils as working fluid is preferred, the performance as a lubricant is inferior. The pitting life is evaluated by the value of D computed by the surface roughness and EHL film thickness. The high traction coefficient causes the tooth surface temperature rise by frictional heat, and then the oil film thickness and pitting life are decreased. To evaluate the performance of these oils as lubricants, the tooth surface temperature at the pitting tests is measured and the EHL film thickness is calculated with it for computing the value of D precisely. All results of fatigue test with three types of oils are examined together and it is found out that they are evaluated by the value of D only. The experimental formula to estimate the pitting life is obtained. This procedure is useful to design the surface gear strength of the automotive ATs and CVTs.

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Jha, Deepak K., i Anuradha Banerjee. "Cohesive Model in Prediction of Multi-Axial Fatigue". W ASME 2010 International Mechanical Engineering Congress and Exposition. ASMEDC, 2010. http://dx.doi.org/10.1115/imece2010-40353.

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A fatigue failure model for life assessment of a structure that incorporates the stress-state dependence and irreversible nature of fatigue damage is presented. In the frame work of cohesive zone model, a stress state dependent traction separation law for plane strain is taken to represent an undamaged ferritic steel. The evolution of damage has two additional fatigue parameters: a stress and a length parameter. Initially a parametric study is done to show that the model is able to reproduce a typical uniaxial fatigue response to stress based cyclic load, that of a stress-life curve and reduction in life due to positive mean stress. The effect of the cohesive fatigue parameters on the characteristics of the stress-life curve is then established. The model is further applied for a range of sinusoidally varying in-phase stress states which are characterised by a fixed bi-axiality ratio. The initiation and growth of damage is shown to be more rapid for higher bi-axiality. Except for stress amplitudes in which the lower bi-axiality case has conditions close to monotonic failure, the effect of bi-axiality is shown to be detrimental to the life expectancy of the material as observed in available experimental literature.

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