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Articles de revues sur le sujet « Fatigue mecanique en traction »

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Auteur : Grafiati

Publié le 8 juillet 2023

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1

Isalgué, Antonio, Javier Fernández, Nuria Cinca, I. G. Cano, Ramón Grau, Carlota Auguet et Vicenç Torra. « Thermomechanical Fatigue Behavior of NiTi Wires ». Materials Science Forum 738-739 (janvier 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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2

Xiang, Hui Yu, Zhi Qiang Li, Chong Jie Leng et De Mao Hu. « Fatigue Analysis of the Rotor Shaft on a High Speed Traction Motor ». Advanced Materials Research 482-484 (février 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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3

Lin, Zhi Jia, et Ming Ye Zhang. « Fatigue Analysis for Traction Transformers during Random Vibration ». Advanced Materials Research 1079-1080 (décembre 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 et Pingsha Dong. « Analysis of fatigue behavior of welded joints in orthotropic bridge deck using traction structural stress ». Advances in Mechanical Engineering 11, n^o 11 (novembre 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 et Young Jin Kim. « Effects of Residual Stress and Traction Force on the Contact Fatigue Life of Railway Wheels ». Key Engineering Materials 326-328 (décembre 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 et 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 (mars 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, n^o 4 (24 septembre 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 et 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 et 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, n^o 2 (1 février 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 et Giacomo Risitano. « Determination of Fatigue Limit by Mono-Axial Tensile Specimens Using Thermal Analysis ». Key Engineering Materials 452-453 (novembre 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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11

Collop, A. C., et D. Cebon. « A Theoretical Analysis of Fatigue Cracking in Flexible Pavements ». Proceedings of the Institution of Mechanical Engineers, Part C : Journal of Mechanical Engineering Science 209, n^o 5 (septembre 1995) : 345–61. http://dx.doi.org/10.1243/pime_proc_1995_209_163_02.

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This paper examines theoretically the possible mechanisms of fatigue cracking in asphalt pavements using linear elastic fracture mechanics (LEFM). The effects of a non-uniform transverse contact traction between the tyre and pavement on longitudinal surface fatigue cracking are examined theoretically using a finite element (FE) pavement model. Fatigue cracking due to thermal loading is also examined using a simplified linear viscoelastic pavement model. Results indicate that the non-uniform transverse contact traction produces short surface cracks (10 mm) but does not lead to significant pavement fatigue. However, for these short surface cracks, the combined vehicle and thermal load cycles may produce conditions that are favourable for fast fracture. Fatigue cracking (both longitudinal and transverse) at the base of the asphalt layer is found to be mainly dependent on the pavement geometry and the magnitude of the normal load.

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FUJIWARA, Ryoga, Kouki ITOU, Yukihito NARITA, Masahiro FUJII, Tosiharu KAZAMA, Yasuhiro OSAFUNE et Tomoya MASUYAMA. « Evaluation of Rolling Contact Fatigue Strength for Traction Drive ». Proceedings of the Machine Design and Tribology Division meeting in JSME 2021.20 (2021) : 1105. http://dx.doi.org/10.1299/jsmemdt.2021.20.1105.

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13

DENG, Gang, Masashi YAMANAKA, Ryoji YAMAMOTO, Noboro ONO, Masana KATO et Katsumi INOUE. « Contact Fatigue and Strength Evaluation of Traction Drive Rollers. » Transactions of the Japan Society of Mechanical Engineers Series C 65, n^o 635 (1999) : 2880–85. http://dx.doi.org/10.1299/kikaic.65.2880.

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14

NAKAZAWA, Kensuke, Hiroki INOUE, Yuki HITOMI, Sho MURAI, Yukihito NARITA et Toshiharu KAZAMA. « Evaluation of Rolling Contact Fatigue Strength for Traction Drive ». Proceedings of Conference of Tohoku Branch 2019.54 (2019) : 144. http://dx.doi.org/10.1299/jsmeth.2019.54.144.

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15

NARITA, Yukihito, Masashi YAMANAKA, Toshiharu KAZAMA, Yasuhiro OSAFUNE et Tomoya MASUYAMA. « Simulation of rolling contact fatigue strength for traction drive elements (comparison with fatigue test) ». Journal of Advanced Mechanical Design, Systems, and Manufacturing 12, n^o 1 (2018) : JAMDSM0024. http://dx.doi.org/10.1299/jamdsm.2018jamdsm0024.

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16

Wang, Qiushi, Jinsong Zhou, Dao Gong, Tengfei Wang, Jiangxue Chen, Taiwen You et Zhanfei Zhang. « The Influence of the Motor Traction Vibration on Fatigue Life of the Bogie Frame of the Metro Vehicle ». Shock and Vibration 2020 (23 octobre 2020) : 1–11. http://dx.doi.org/10.1155/2020/7385861.

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During the service life of metro vehicles, the cracks frequently appear at the root of motor seats. This indicates the previous antifatigue designs are unable to cover the actual operating environment. Some individual loads, such as motor vibration, have been ignored or wrongly understood, which leads to the occurrence of local insufficient fatigue life of the frame. To illustrate the influence of the motor vibration on the fatigue life of the bogie frame, a metro vehicle was taken as an example: first, the precise finite element model of the frame was established, and its correctness was verified; then, the vibration characteristics of the frame were analyzed by sweep frequency calculation; and finally, considering the vibration acceleration signal of the motor measured on a metro line as the excitation, the influence of the random vibration on the fatigue life of the frame under traction and idle running conditions was compared and analyzed by solving the power spectral density of the dynamic stress response at the weak fatigue nodes of the structure. The results show that the energy of the vibration in the frame is mainly concentrated in modes 6 and 7, which are excited by the motor transverse and vertical vibration, respectively, and contribute a lot to the fatigue damage of the frame; the fatigue life of the vital positions of the frame under the traction condition significantly reduces compared to the idle running condition; and the contribution of the low-amplitude vibration above 300 Hz to the fatigue damage can be ignored. At last, the importance of the influence of the motor traction vibration on the fatigue life should be fully considered in the metro vehicle design was proposed.

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Xie, Miao-Xia, Yuan-Qi Wei, Qi-Ke Xin, Li-Xia Li et Yu-Min He. « Fatigue Resistance of Fillet Welds of Traction Rod Brackets on a Locomotive Bogie Based on International Union of Railways Standards and Improvement Measures Adopted ». Applied Sciences 13, n^o 9 (28 avril 2023) : 5494. http://dx.doi.org/10.3390/app13095494.

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To solve the problem of fatigue failure in fillet welds of traction rod brackets on locomotive bogies of a given model, the cause for failure and the improvement method were studied. The results show that when there is maximum clearance at weld roots, maximum incomplete fusion of sidewalls, maximum incomplete fusion at weld roots, and maximum pores allowable in the ISO 5817 standard, the stress amplitude separately increases by 70~97%, 53~55%, 40~46%, and 19~34%. Despite this, when various types of defects of the maximum size are present in the weld alone, the static and fatigue strengths of fillet welds with a throat depth of 6 mm on the traction rod bracket can still meet the requirements in the UIC615-4 standard. In practical fillet welds, defects including clearance at weld roots, incomplete fusion, and pores are very likely to occur at the same time, which may induce fatigue failure in fillet welds of traction rod brackets within the original design life. According to the size of the frame and the traction rod brackets, a strengthening scheme for increasing the throat depth of fillet welds of traction rod brackets to 8 mm was designed. Calculation results of the strengthening scheme show that for new structures subjected to overall post-weld stress-relief thermal treatments, the maximum stress amplitude decreases by 5~29% when increasing the throat depth of fillet welds from 6 to 8 mm. For structures in service with the throat depth of fillet welds increased from 6 to 8 mm through repair welding, peak residual stress at the weld root after repair welding can reach 383 MPa. Because overall stress-relief thermal treatments cannot be performed on repair-welded structures, the fatigue strength of repair-welded fillet welds cannot meet the requirements of UIC615-4; therefore, local stress-relief treatments have to be performed in the welded zone. The results are of guiding significance for the treatment of locomotives in service and performance improvement of new locomotives and suggest that the current standard is relatively conservative.

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Yang, Haibo, Ping Wang, Hongliang Qian et Pingsha Dong. « Fatigue Performance of Different Rib-To-Deck Connections Using Traction Structural Stress Method ». Applied Sciences 10, n^o 4 (12 février 2020) : 1239. http://dx.doi.org/10.3390/app10041239.

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The fatigue performance of an orthotropic steel bridge deck is significantly influenced by the type of the rib-to-deck connection considering the crossbeam. Fatigue fracture of the weld seam at the rib-to-deck connection has been a serious problem in such decks. In this paper, numerical models are developed for the orthotropic steel bridge decks and are analyzed for the fatigue behavior. The traction structural stress method is proven to be more accurate and effective in predicting the fatigue life. Fatigue behavior of three typical rib-to-deck connections are obtained by using traction structural stress method and by considering the effect of crossbeams. Compared to the bridge deck with weld seam of a large root, the fatigue performance of the deck with single-sided weld seam is much better with lower equivalent structural stress. The results indicate that the weld seam size should be strictly controlled for better fatigue resistance. The fatigue performance of the bridge deck with double-sided seam is significantly better than that of the bridge deck with single-sided weld seam. An increase in the thickness of the inner weld seam in the rib-to-deck connection optimizes the distribution of the equivalent structural stress and shifts the fatigue failure location from the weld root of the outer weld seam to the weld toe of the inner weld seam thus demonstrating the effect of the crossbeam. The trends of equivalent structural stress with geometric parameters of the weld seam in the rib-to-deck connection are obtained in this study. The fatigue behavior of the components and the equivalent structural stress are significantly influenced by the bridge deck thickness.

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Parrinello, Francesco, Vincenzo Gulizzi et Ivano Benedetti. « A Model for Low-Cycle Fatigue in Micro-Structured Materials ». Key Engineering Materials 827 (décembre 2019) : 134–40. http://dx.doi.org/10.4028/www.scientific.net/kem.827.134.

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A microscale formulation for low-cycle fatigue degradation in heterogeneous materials is presented. The interface traction-separation law is modelled by a cohesive zone model for low-cycle fatigue analysis, which is developed in a consistent thermodynamic framework of elastic-plastic-damage mechanics with internal variables. A specific fatigue activation condition allows to model the material degradation related to the elastic-plastic cyclic loading conditions, with tractions levels lower than the static failure condition. A moving endurance surface, in the classic framework of kinematic hardening, enables a pure elastic behaviour without any fatigue degradation for low levels of cyclic traction. The developed model is then applied to micro-structured materials whose micro-mechanics is analysed using a boundary integral formulation. Preliminary results demonstrate the potential of the developed cohesive model. The future application of the proposed technique is discussed in the framework of multiscale modelling of engineering components and design of micro-electro-mechanical devices (MEMS).

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Braut, Sanjin, Eerik Sikanen, Janne Nerg, Jussi Sopanen et Željko Božić. « Fatigue life prediction of Electric RaceAbout (ERA) traction motor rotor ». Procedia Structural Integrity 31 (2021) : 45–50. http://dx.doi.org/10.1016/j.prostr.2021.03.024.

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NARITA, Yukihito, Masashi YAMANAKA, Toshiharu KAZAMA, Yasuhiro OSAFUNE et Tomoya MASUYAMA. « Simulation of Rolling Contact Fatigue Strength for Traction Drive Elements ». Journal of Advanced Mechanical Design, Systems, and Manufacturing 7, n^o 3 (2013) : 432–47. http://dx.doi.org/10.1299/jamdsm.7.432.

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NARITA, Yukihito, Ryousuke SATO, Tatsuya SASAGAWA, Masashi YAMANAKA, Toshiharu KAZAMA, Yasuhiro OSAFUNE et Tomoya MASUYAMA. « SIMULATION OF ROLLING CONTACT FATIGUE STRENGTH FOR TRACTION DRIVE ELEMENTS ». Proceedings of the JSME international conference on motion and power transmissions 2017 (2017) : 11–05. http://dx.doi.org/10.1299/jsmeimpt.2017.11-05.

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Risitano, A., et G. Risitano. « Determining fatigue limits with thermal analysis of static traction tests ». Fatigue & ; Fracture of Engineering Materials & ; Structures 36, n^o 7 (12 mars 2013) : 631–39. http://dx.doi.org/10.1111/ffe.12030.

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SASAGAWA, Tatsuya, Taihei YAMAMOTO, Ryosuke Sato, Yukihito Narita et Toshiharu KAZAMA. « Simulation of rolling contact fatigue strength for traction drive elements ». Proceedings of Conference of Tohoku Branch 2017.52 (2017) : 208. http://dx.doi.org/10.1299/jsmeth.2017.52.208.

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Wang, J., P. S. Kun, T. M. Lenkovskyi, I. A. Vikovych et V. M. Boiko. « Estimation of the Fatigue Strength of a Plate Traction Chain ». Materials Science 56, n^o 3 (novembre 2020) : 327–32. http://dx.doi.org/10.1007/s11003-020-00433-x.

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Shrajber, M. « Fatigue aging of insulation of traction motors of diesel locomotives ». E3S Web of Conferences 383 (2023) : 01011. http://dx.doi.org/10.1051/e3sconf/202338301011.

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This paper analyzes the problem of occurrence and development of fatigue processes in the insulation of traction motors of autonomous locomotives. Factors causing destruction (cracking, delamination, occurrence of voids) of insulation in operation have been studied in the course of the research. Three characteristic stress cycles (reversible, repetitive, random) were described to make fatigue failure predictions. Outcomes of investigations of temperature conditions of windings of electric machines of diesel locomotives show that during operation the insulation experiences variable thermomechanical stresses. Received data can be recommended to take into account during the creation of new electric machines for diesel locomotives, as well as during the operation and resource recovery of already existing ones.

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Lu, Li Juan, Xiao Gui Wang, Li Jian Zhuang, Zeng Liang Gao et Y. Y. Jiang. « Influence of Partial Slip Conditions on Rolling Contact Fatigue of 1070 Steel ». Advanced Materials Research 44-46 (juin 2008) : 911–16. http://dx.doi.org/10.4028/www.scientific.net/amr.44-46.911.

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Partial slip rolling contact was analyzed in this paper by the finite element method with the application of a robust cyclic plasticity model. The repeated rolling contact process was carried out by translating the normal pressure and the tangential traction across the contact surface step by step. The normal pressure and the tangential traction were applied to the nodes through the time-dependant amplitude functions as the concentrated nodal forces. With the detailed stress-strain responses output from the FE analysis, a general multiaxial fatigue criterion was used to predict fatigue initiation life and initiation position. The influences of partial slip conditions on the residual stresses, residual shear strain and the initiation lives are obtained.

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SATOH, Ryosuke, Taihei YAMAMOTO, Tatuya SASAGAWA, Yukihito NARITA et Toshiharu KAZAMA. « Evaluation of Rolling Contact Fatigue Strength for Traction Drive Elements by Using Two disk Fatigue Tester ». Proceedings of Conference of Tohoku Branch 2017.52 (2017) : 207. http://dx.doi.org/10.1299/jsmeth.2017.52.207.

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C.A.pdevila, X., Y. Ryckwaert, F. d'Athis et C. Préfaut. « R521 Effets de la ventilation mecanique sur la fatigue et la typologie des muscles respiratoires chez le lapin ». Annales Françaises d'Anesthésie et de Réanimation 17, n^o 8 (janvier 1998) : 1072. http://dx.doi.org/10.1016/s0750-7658(98)80639-4.

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Seo, Jung-Won, Hun-Mu Hur, Jae-Boong Choi et Young-Jin Kim. « Effect of Metal Removal and Traction Force on Contact Fatigue Life ». Transactions of the Korean Society of Mechanical Engineers A 29, n^o 10 (1 octobre 2005) : 1384–91. http://dx.doi.org/10.3795/ksme-a.2005.29.10.1384.

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FUJII, Masahiro, Akira YOSHIDA, BAYASGALAN Seesregdorj, Kazuya NAGAO, Kiyoji MINEGISHI et Jun TAMENAGA. « 2206 Rolling Contact Fatigue of Steel Roller under Traction Oil Lubrication ». Proceedings of the Machine Design and Tribology Division meeting in JSME 2006.6 (2006) : 203–4. http://dx.doi.org/10.1299/jsmemdt.2006.6.203.

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Zhou, Wenqing, Pingsha Dong, Xianjun Pei, Özler Karakas et Xiangwei Li. « Evaluation of magnesium weldment fatigue data using traction and notch stress methods ». International Journal of Fatigue 138 (septembre 2020) : 105695. http://dx.doi.org/10.1016/j.ijfatigue.2020.105695.

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Lian, Zhen Hong, et Zhong Lei Yang. « Design of Axle Gear Box for Tunnel Traction Engine ». Applied Mechanics and Materials 872 (octobre 2017) : 223–29. http://dx.doi.org/10.4028/www.scientific.net/amm.872.223.

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The axle gear case in tunnel traction engine is taken as a research object and the rigid-flexible mixture virtual prototype is created by using RomaxDesigner software in this article. Gear profile modification, gear-tooth fatigue strength, bearing life, the static strength and modal of case body are calculated and analyzed by applying load spectrum to the virtual prototype, in which the deformation of transmission system is considered in simulations. The results show that the virtual prototype of axle gear case meets the requirements of mechanical performances.

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Wang, Lei, Shenyi Liu, Ruichang Qiu et Chunmei Xu. « Fault Prediction Model of High-Power Switching Device in Urban Railway Traction Converter with Bi-Directional Fatigue Data and Weighted LSM ». Applied Sciences 9, n^o 3 (28 janvier 2019) : 444. http://dx.doi.org/10.3390/app9030444.

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The switching device is relatively weakest in the traction converter, and this paper aims at the fault prediction of it. Firstly, the mathematical distribution is analyzed based on the results that were obtained in electro thermal simulation and a single-directional accelerated fatigue test. Then, the accelerated fatigue test with bi-directional fatigue current is proposed, the data from which reflects the accelerating effect from FWD on the device aging process. The analytical model of fatigue process is fitted with the data that were obtained in the test. In order to shorten the test time consumption, we propose a weighted least squares method (LSM) to fit the failure data. Finally, the prediction model is presented with the consideration of fatigue signature and Arrhenius temperature factor.

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Jiang, You Ming, Yi Huang Zhang, Yun Feng He, Hui Yu Xiang et Jun Ci Cao. « Strength and Fatigue Analyses on Rotor in High Speed MU Traction Motor under Different Operating States ». Advanced Materials Research 314-316 (août 2011) : 1713–16. http://dx.doi.org/10.4028/www.scientific.net/amr.314-316.1713.

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Considering the impact and the vibration that add to its driving system when high-speed MU running in the complex conditions, the rotor mechanical strength problems of a traction motor in MU power transmission system are studied, in this paper. The motor operating parameters when MU operating under different states, such as the starting process, the increasing voltage constant power process, and the constant voltage constant power process, are taken as the constraint boundary conditions in different situations. Considering the asymmetry of axial constraint, the distributions of both the Von Mises stress and the contact stress in rotor under different working states are analyzed, and the strength situation of rotor is evaluated. Then, the fatigue strength of rotor in a long duration rated operating is studied, and the fatigue weak position in rotor is found. The obtained results could provide a theoretical basis for the safety operation of traction motor in high-speed MU.

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Risitano, Giacomo, et Carmelo Clienti. « Experimental Study to Verify the Fatigue Limit Found by Thermal Analysis of Specimen Surface in Mono Axial Traction Test ». Key Engineering Materials 488-489 (septembre 2011) : 795–98. http://dx.doi.org/10.4028/www.scientific.net/kem.488-489.795.

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Following the first experimental results concerning the possibility to estimate the fatigue limit by semi-static tensile traction test, the authors are continuing the experimental thermo-analysis of the curve zone between the origin and the yield stress; that is rich of indication about the fatigue failure process. The tests carried out on the AISI 304 steel by thermal analysis, confirmed the good approximation between the values of the fatigue limit estimated by fatigue test and by the quasi-static test. The results shoed the importance of the thermo-analysis of the part of the stress-strain curve (distant from the yield point) where only in macroscopic terms the behavior is perfectly elastic.

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Li, Shanjun, Zehua Yang, Qiang Wan, Jianfeng Hou, Yangyi Xiao, Xin Zhang, Rui Gao et Liang Meng. « Increase in Wear Resistance of Traction Wheel via Chromizing : A Study Combining Experiments and Simulations ». Coatings 12, n^o 9 (2 septembre 2022) : 1275. http://dx.doi.org/10.3390/coatings12091275.

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The wear failure of traction wheels in orchard transport severely restricts the stability of orchard conveyors and impedes the mechanization of orchard work. In this study, the thermal-diffusion chromizing method was employed to increase the hardness of a traction wheel for the enhancement of wear resistance. The results show that a uniform and dense chrome coating with a thickness of 16 μm was formed on the surface. The coating was revealed to have a hardness of 1752.7 HV and benefited from the formation of Cr-C compounds. A friction test and a wear simulation test under both dry-friction and lubrication conditions were conducted to assess the enhanced wear resistance based on the friction coefficient and wear loss. The friction coefficient of QT400 and that of the chrome coating were 0.37 and 0.36, respectively, under dry conditions. Additionally, the friction coefficient of QT400 decreased to 0.12, while that of the chrome coating remained at 0.35, under lubrication conditions. In the wear simulation test, the wear loss of the chromed traction wheel was about 1/28 of that of the QT400 traction wheel under dry-friction conditions. In addition, the wear loss of the chromed traction wheel was about 1/24 of that of the QT400 traction wheel under lubrication conditions. Moreover, the wear mechanism was analyzed with a microstructure study and finite element analysis (FEA). The synergetic effect between fatigue wear and abrasive wear was likely responsible for the wear failure of the traction wheel. The method proposed in this study may be a promising way to enhance the wear resistance of QT400 traction wheels through the application of a chrome coating without sacrificing the loading capacity, and this work contributes to the understanding of the wear failure mechanism of traction wheels.

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GUTAREVICH, Viktor, et Marina KONDRATENKO. « DYNAMICS OF TRACTION DEVICE OF MINE SUSPENDED MONOREL ROAD ». Sustainable Development of Mountain Territories 12, n^o 3 (30 septembre 2020) : 410–17. http://dx.doi.org/10.21177/1998-4502-2020-12-3-410-417.

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During the operation of the mine suspension monorail track and traction device form a mechanical system experiencing high dynamic loads associated with implementation of traction and braking forces. Emerging dynamic loads lead to formation of elastic deformations and oscillations that cause vibrations, which leads to displacement of drive wheels and reduces the implementation of traction. The study of the dynamics of traction device is an important step in improving safety and reliability of monorail transport. The aim of the work is to study dynamics of a friction-type traction device moving along a suspended monorail to assess influence of parameters of the elements of device on the vibrations and nature of interaction of drive wheels with monorail. Research methods. Mathematical modeling of the oscillatory processes resulting from interaction of the running gear of the traction device with the monorail is used. Stages of research include drawing up a design diagram oscillations of drive wheels of the traction device interacting with the monorail, developing a mathematical model for the analysis of vibrations caused by moving loads, also assessing the influence of structural parameters of mechanical system under consideration on nature of oscillations. Research results. The developed mathematical model of friction-type traction device movement allows us to establish relationship between parameters of structural elements of its running gear and pressure mechanism, as well as nature of vibrations that arise. As a result, frequencies of the mechanical system under consideration and maximum deviations were found, which allows you to set optimal device parameters to increase traction and increase lifespan of monorail suspended roads. Findings. It was determined that the frequency range of vibration of drive wheels mainly corresponds to the mid-frequency local vibrations of 16–36 Hz. Increasing length of lever for fixing axles of wheels and reducing their radius leads to formation of low-frequency vibrations with a frequency of less than 15 Hz. When length of lever of drive wheels is more than 0.5 m, shoulder of the spring is more than 0.6 m and radius of drive wheels is less than 0.25 m, vibrations with frequencies below 5 Hz can occur. It was found that increasing the length of lever for securing spring increases the oscillation frequency of one drive wheel and reduces frequency of the other. The difference between these frequencies significantly affects changes in the pressure of the wheels against monorail. When difference between frequencies is more than 10–12 Hz, direction of load changes pulsed, with a maximum swing of 0.02 rad, which reduces formation of fatigue fractures of tire wheels, and moments of decrease and increase in pressing force have a negative effect on traction, leading to slippage of drive wheels. When difference between frequencies is less than 10–12 Hz, direction of the load changes sharply, with a maximum swing of 0.03 rad, which increases deformation and formation of fatigue fractures of tire wheels, and short moments of weakening and increase of pressing force, constituting 0.1–0.3 s does not have a significant negative effect on traction.

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Huang, Xianghe, Jinhai Wang, Jianwei Yang, Yue Zhao et Yuzhu Wang. « Influence of Passenger Capacity on Fatigue Life of Gearbox Suspender of the Traction Transmission System in Urban Railway Vehicles ». Sustainability 15, n^o 5 (28 février 2023) : 4338. http://dx.doi.org/10.3390/su15054338.

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Fatigue damage is the most dangerous failure behavior for gearbox suspenders in urban railway vehicles, and passenger capacity is crucial to the dynamic load characteristics of the traction transmission system. Therefore, in this paper, a dynamic model of the motor car is established, and a numerical simulation is carried out under different speeds and curve radii to investigate the effect of passenger capacity on fatigue life. The research results show that passenger capacity is an essential factor affecting the fatigue life of suspenders. As the vehicle runs at an average speed, the fatigue life of the suspender is 1.07 × 106 km when the passenger capacity is 120 people; when there are 240 people, the fatigue life reduction is 60%, while it is 86% at 339 people and 92% at 389 people. The per capita fatigue damage under a straight line is 7.27 × 10−10 at 20 km/h but 1.23 × 10−8 at 60 km/h. The per capita fatigue damage under a curved line is 7.18 × 10−9 in the 600 m curve but 9.00 × 10−9 in the 400 m curve. It can be concluded that the effect of speed is more significant than the curve radius. This research achievement can provide theoretical support for vehicle design and maintenance decisions.

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Li, Ting, Jian Cheng Zhang et You Tong Fang. « Dynamic Analysis of Support System of Permanent Magnet Traction Motors for High-Speed Trains ». Applied Mechanics and Materials 416-417 (septembre 2013) : 1883–88. http://dx.doi.org/10.4028/www.scientific.net/amm.416-417.1883.

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During the operation, the high speed train will be subject to random vibration load induced by the roughness of the rail and will cause the vibration. Traction motor is critical component of traction system for high-speed train. It is subject to not only static loads, but also random vibration load. This kind of random vibration load may easily lead to fatigue damage of the structure, which will finally cause adversely effect to the motor. Thus, in this paper, a 3-dimension model of the support system of traction motors in high-speed train applications is built, and the static and modal analyses are undertaken using finite element calculation software. The simulation results confirm that the support system is robust enough to meet the design requirements of strength and stiffness. Furthermore, it has a larger margin of safety in a typical case which meets the technical requirements for safe operation of the high-speed train.

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Wei, Zhigang, Fulun Yang, Limin Luo, Katherine Avery et Pingsha Dong. « Fatigue Life Assessment of Welded Structures with the Linear Traction Stress Analysis Approach ». SAE International Journal of Materials and Manufacturing 5, n^o 1 (16 avril 2012) : 183–94. http://dx.doi.org/10.4271/2012-01-0524.

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Wei, Zezhong, Xianjun Pei, Xudong Qian, Shizhu Xing, Liuyang Feng et Hui Jin. « Traction stress-based fatigue failure mode identification of load-carrying welded cruciform joints ». International Journal of Fatigue 161 (août 2022) : 106897. http://dx.doi.org/10.1016/j.ijfatigue.2022.106897.

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Han, Tongyang, Zhiming Liu, Qiang Li et Longxiu Miao. « Evaluation of Fatigue Life and Reinforcing Scheme on 6K Electric Locomotive Traction Seats ». Procedia Engineering 45 (2012) : 930–35. http://dx.doi.org/10.1016/j.proeng.2012.08.261.

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Risitano, A., R. Giacomo et C. Clienti. « Fatigue limit by thermal analysis of specimen surface in mono axial traction test ». EPJ Web of Conferences 6 (2010) : 38010. http://dx.doi.org/10.1051/epjconf/20100638010.

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Alkaissi, Zainab Ahmed, Yasir M. Al-Badran et Najwa Wasif. « Theoretical Analysis on the Effect of Surface Horizontal Traction on Top-Down Cracking of Flexible Pavement ». Association of Arab Universities Journal of Engineering Sciences 26, n^o 1 (31 mars 2019) : 170–74. http://dx.doi.org/10.33261/jaaru.2019.26.1.022.

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Fatigue cracking of flexible pavement is one of the most important elements that should be considered due to the damage occurs in asphalt layer under the effect of wheel load repetitions. This research demonstrated theoretical study on top-down fatigue crackingusing the finite element method. A three- dimensional finite elastic structural element is used to modal pavement using (ABAQUS ver. 6.12.1) program. The results obtained from this studydemonstrated that maximum value of tensile strain developed at the surface of asphalt layer for flexible pavement due to the horizontal traction generated from wheel load application at contact area. Also, the horizontal tensile strain ( ) at surface of asphalt layer is increasing rapidly with load repetitions with values greater than that generated at bottom by (94%) at failure. This prescribed the basic or inherent features of top crack initiation and down propagates within asphalt layer in flexible pavement. The top horizontal tensile strains obtained from the finite element model is higher than the empirical relations by (20%); since the finite element analysis of flexible pavement considered the surface horizontal tensile strains due to contact traction force at tire pavement interface. Finally, according to the results of this study the horizontal tensile strains at the top of asphalt surface significantly increase the damage intensity of fatigue failure for flexible pavement.

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Kim, Chul Su, et Gil Hyun Kang. « Durability Analysis of the Reduction Gear for High Speed Train Considering Driving Histories ». Advanced Materials Research 586 (novembre 2012) : 269–73. http://dx.doi.org/10.4028/www.scientific.net/amr.586.269.

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To assure the safety of the power bogies for train, it is important to perform the durability analysis of reduction gear considering a variation of velocity and traction motor capability. In this study, two types of applied load histories were constructed from driving histories considering the tractive effort and the train running curves by using dynamic analysis software (MSC.ADAMS). Moreover, this study was performed by evaluating fatigue damage of the reduction gears for rolling stock using durability analysis software (MSC.FATIGUE). The finite element model for evaluating the carburizing effect on the gear surface was used for predicting the fatigue life of the gears. The results showed that the fatigue life of the reduction gear would decrease with an increasing numbers of stops at station.

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Fouathia, A., A. Mekroud et K. Bellagh. « Calculation of the stress concentration factor in the welded tube junction subjected to combined loadings ». World Journal of Engineering 11, n^o 4 (1 août 2014) : 339–48. http://dx.doi.org/10.1260/1708-5284.11.4.339.

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Fatigue failure caused by stress concentrations in tubular welded joints is observed in off shore platforms subjected to cyclic loading in corrosive marine environments. In some junctions, the stress concentration can induce a stress thirty times the nominal stress, and increase the risk of fatigue failure in tubular joints. Therefore, it is necessary to accurately assess the intensity of the stress concentrations to effectively deal with the problem of fatigue damage and lead to reliable tubular joints. This work aims to study the stress distribution and location of the "hot" spots in a Twelded tubular structure subjected to a combined loading of tension and bending (in-plane bending, out of plane bending and traction) to better simulate the actual loading.

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Seo, Jung Won, Hyun Kyu Jun, Seok Jin Kwon et Dong Hyeong Lee. « Rolling Contact Fatigue and Wear Behavior of Rail Steel under Dry Rolling-Sliding Contact Condition ». Advanced Materials Research 891-892 (mars 2014) : 1545–50. http://dx.doi.org/10.4028/www.scientific.net/amr.891-892.1545.

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Rolling contact fatigue and wear of rails are inevitable problems for railway system due to wheel and rail contact. Increased rail wear and increased fatigue damage such as shelling, head check, etc. require more frequent rail exchanges and more maintenance cost. The fatigue crack growth and wear forming on the contact surface are affected by a variety of parameters, such as vertical and traction load, friction coefficient on the surface. Also, wear and crack growth are not independent, but interact on each other. Surface cracks are removed by wear, which can be beneficial for rail, however too much wear shortens the life of rail. Therfore, it is important to understand contact fatigue and wear mechanism in rail steels according to a variety of parameters. In this study, we have investigated fatigue and wear characteriscs of rail steel using twin disc testing. Also the comparative wear behavior of KS60 and UIC 60 rail steel under dry rolling-sliding contact was performed.

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Megna, Gianluca, et Andrea Bracciali. « Gearless Track-Friendly Metro with Guided Independently Rotating Wheels ». Urban Rail Transit 7, n^o 4 (18 novembre 2021) : 285–300. http://dx.doi.org/10.1007/s40864-021-00159-2.

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AbstractTrack–vehicle severe interaction on track with small curve radius results in rail wear and corrugation, and wheel polygonization, which drain considerable resources for rail grinding and wheels re-profiling in metro lines. To reduce the damage caused by track-vehicle severe interaction, the paper analyzes the reasons leading to rail wear and then proposes an architecture of a metro vehicle with independently rotating wheels driven directly by permanent magnet synchronous motors. The architecture is axle guidance, offered by passive linkages, which ensures that all axles are oriented radially, while control strategy was kept as simple as possible, identifying only two basic traction conditions. The concept is first discussed and then validated through a comprehensive set of running dynamics simulation performed with a multibody software to evaluate rail wear and rolling contact fatigue in traction/braking, coasting with different cant deficiency/excess conditions. The multibody dynamics simulation shows that the proposed architecture is virtually capable of avoiding both wear and rolling contact fatigue damages, and achieves the highest possible track friendliness. The concept of the proposed architecture is a track-fiendly metro architecture and could be a good reference for reducing rail-track interaction damages and maintainace cost.

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Wang, Yan Gang, Dinesh Chamund, Shi Ping Li, Kevin Wu, Steve Jones et Gary Liu. « Lifetime Prediction for Power IGBT Modules in Metro Traction Systems ». Advanced Materials Research 846-847 (novembre 2013) : 724–31. http://dx.doi.org/10.4028/www.scientific.net/amr.846-847.724.

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In this work, the methodology and procedures of lifetime prediction for power IGBT modules are presented. Firstly, we discuss the long term reliability tests of power modules for developing lifetime models, and review some reported lifetime models. Then, the procedures of lifetime prediction in real applications are addressed, which include power loss calculations based on the actual mission profile, the conversion of power loss profile to temperature profile according to the module's thermal properties, the temperature cycles counting by Rainflow algorithm, and lifetime calculation by the fatigue linear accumulation damage theory. Finally, the lifetime of a 3300V/800A IGBT module manufactured by Dynex Semiconductor of China Southern Railway applied in metro traction systems is predicted.

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