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A fatigue life prediction method of rolling bearing under elliptical contact elastohydrodynamic lubrication 被引量:1
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作者 路春雨 刘少军 《Journal of Southeast University(English Edition)》 EI CAS 2017年第1期46-52,共7页
In order to more accurately predict the contact fatigue life of rolling bearing, a prediction method of fatigue life of rolling bearing is proposed based on elastohydrodynamic lubrication (EHL), the 3-paameter Weibu... In order to more accurately predict the contact fatigue life of rolling bearing, a prediction method of fatigue life of rolling bearing is proposed based on elastohydrodynamic lubrication (EHL), the 3-paameter Weibull distribution ad fatigue strength. First,the contact stress considering elliptical EHL is obtained by mapping film pressure onto the Hertz zone. Then,the basic strength model of rolling bearing based on the 3-parameter Weibull distribution is deduced by the series connection reliability theory. Considering the effect of the type of stress, variation of shape and fuctuation of load, the mathematical models of the 尸 -tS-TV curve of the minimum life and the characteristic life for rolling bearing are established, respectively, and thus the prediction model of fatigue life of rolling bearing based on the 3-paameter Weibull distribution and fatigue strength is further deduced. Finally, the contact fatigue life obtained by the proposed method ad the latest international standard (IS0281: 2007) about the fatigue life prediction of rolling bearing are compared with those obtained by the statistical method. Results show that the proposed prediction method is effective and its relative error is smaier than that of the latest international standard (IS0281: 2007) with reliability R 〉 0. 93. 展开更多
关键词 rolling bearing 3-parameter Weibull distribution elastohydrodynamic lubrication (EHL) fatigue strength contact fatigue life
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Effects of Service Condition on Rolling Contact Fatigue Failure Mechanism and Lifetime of Thermal Spray Coatings——A Review 被引量:12
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作者 CUI Huawei CUI Xiufang +2 位作者 WANG Haidou XING Zhiguo JIN Guo 《Chinese Journal of Mechanical Engineering》 SCIE EI CAS CSCD 2015年第1期132-139,共8页
The service condition determines the Roiling Contact Fatigue(RCF) failure mechanism and lifetime under ascertain material structure integrity parameter of thermal spray coating. The available literature on the RCF t... The service condition determines the Roiling Contact Fatigue(RCF) failure mechanism and lifetime under ascertain material structure integrity parameter of thermal spray coating. The available literature on the RCF testing of thermal spray coatings under various condition services is considerable; it is generally difficult to synthesize all of the result to obtain a comprehensive understanding of the parameters which has a great effect on a thermal spray coating's resistance of RCF. The effects of service conditions(lubrication states, contact stresses, revolve speed, and slip ratio) on the changing of thermal spray coatings' contact fatigue lifetime is introduced systematically. The effects of different service condition on RCF failure mechanism of thermal spray coating from the change of material structure integrity are also summarized. Moreover, In order to enhance the RCF performance, the parameter optimal design formula of service condition and material structure integrity is proposed based on the effect of service condition on thermal spray coatings' contact fatigue lifetime and RCF failure mechanism. The shortage of available literature and the forecast focus in future researches are discussed based on available research. The explicit result of RCF lifetime law and parameter optimal design formula in term of lubrication states, contact stresses, revolve speed, and slip ratio, is significant to improve the RCF performance on the engineering application. 展开更多
关键词 rolling contact fatigue lubrication conditions contact stress revolve speed slip ratio
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Rail fatigue crack propagation in high-speed wheel/rail rolling contact 被引量:3
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作者 Xiaoyu Jiang Xiaotao Li +1 位作者 Xu Li Shihao Cao 《Journal of Modern Transportation》 2017年第3期178-184,共7页
To study the wheel/rail rolling contact fatigue of high-speed trains, we obtain the distribution of contact forces between wheel and rail by introducing the strain-rate effect. Based on the finite element simulation, ... To study the wheel/rail rolling contact fatigue of high-speed trains, we obtain the distribution of contact forces between wheel and rail by introducing the strain-rate effect. Based on the finite element simulation, a two-dimensional finite element model is established, and the process of a wheel rolling over a crack is analyzed to predict the crack propagation direction. The statistics of possible crack prop- agation angles are calculated by the maximum circumfer- ential stress criterion. The crack path is then obtained by using the average crack propagation angle as the crack propagation direction according to Weibull distribution. Results show that the rail crack mode of low-speed trains is different from that of high-speed trains. The rail crack propagation experiences a migration from opening mode to sliding mode under the low-speed trains; however, the rail crack mainly propagates in the opening mode under high- speed trains. Furthermore, the crack propagation rate for high-speed trains is faster than that for low-speed trains. The simulated crack paths are consistent with the experimental ones, which proves that it is reasonable to use the average value of possible crack propagation directions as the actual crack propagation direction. 展开更多
关键词 rolling contact fatigue Finite element Crackpropagation Weibull distribution
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Effect of carburization on microstructure and rolling contact fatigue property of 95W-3.4Ni-1.6Fe heavy alloy 被引量:3
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作者 Guang-hong WANG Sheng-guan QU +2 位作者 Rui-liang HE Ke HU Xiao-qiang LI 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2016年第12期3161-3169,共9页
95W?3.4Ni?1.6Fe heavy alloy was carburized by pack carburization. Microstructure and hardness of the carburized alloywere investigated by SEM, EDS XRD. Effect of carburization on the rolling contact fatigue (RCF) prop... 95W?3.4Ni?1.6Fe heavy alloy was carburized by pack carburization. Microstructure and hardness of the carburized alloywere investigated by SEM, EDS XRD. Effect of carburization on the rolling contact fatigue (RCF) property of the alloy was studied.The results showed that the carburized layer was composed of the outer, porous WC layer and the modified subsurface layer witheach W grain surrounded by a WC shell. Carburization not only decreased the RCF performance of the alloy but also aggravated thewear of the counter balls. The untreated alloy was damaged by two modes of spalling and delamination under RCF condition. Thesubsurface main crack of the untreated alloy initiated where the maximum shear stress existed and preferentially propagated alongthe W?W interfaces. Spalling was the main failure mode of the carburized alloys, and the crumbling WC particles intensified theabrasion of the carburized surface. 展开更多
关键词 tungsten alloy rolling contact fatigue CARBURIZATION SPALLING
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Rolling contact fatigue of silicon nitride bearing balls under pure rolling condition 被引量:2
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作者 周井玲 吴国庆 +1 位作者 陈晓阳 张培志 《Journal of Shanghai University(English Edition)》 CAS 2008年第4期358-362,共5页
A newly developed pure rolling fatigue test rig with three contact points for bearing bails was used to perform rolling contact fatigue (RCF) tests. The fatigue properties of GCrl5 steel bails and two kinds of Si3N4... A newly developed pure rolling fatigue test rig with three contact points for bearing bails was used to perform rolling contact fatigue (RCF) tests. The fatigue properties of GCrl5 steel bails and two kinds of Si3N4 ceramic balls (GSN-200 and NBD-200) produced with different technologies were compared. Ball surfaces were examined after failure with optical microscope and scanning electron microscope (SEM). It was identified by tests that the failure mode of ceramic balls was surface spail. The main factor of ceramic bail failure was principal tensile stress. Life tests data, summarized in accordance with the Weibull theory, showed that the life of GSN-200 balls was close to that of GCrl5 balls, whereas the life of NBD-200 balls was much longer than those of GSN-200 and GCr15. Under the same working condition, the temperature rise of all ceramic bails was lower than that of steel balls, and their crack propagation rates were slower than that of steel balls. 展开更多
关键词 ceramic ball pure rolling contact fatigue life
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The Morphology of Rolling Contact Fatigue Fracture of Hardened Steels 被引量:1
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作者 王绪 章守华 崔佩庸 《Journal of Materials Science & Technology》 SCIE EI CAS CSCD 1989年第2期85-89,共5页
Rolling Contact Fatigue(RCF) is a cumulative damage phenomenon when metals are subjected to repeated contact stresses. The fomation of pitting on the contact surface is the result of the rolling contact fatigue. The m... Rolling Contact Fatigue(RCF) is a cumulative damage phenomenon when metals are subjected to repeated contact stresses. The fomation of pitting on the contact surface is the result of the rolling contact fatigue. The morphologies of rolling contact fatigue fracture of the har- dened steels (86CrHoV7, 42CrMo) show that strong resemblance in fractuye mechanisms exists between rolling contact fatigue and uni-axial fatigue. Since fatigue striations are hardly observed in hardened steels under uni-axial fatigue, it is interesting to note that the state of stress in rolling contact fatigue is more favor- able to ductile fractures than in uni-axial fatigue. 展开更多
关键词 rolling contact contact fatigue PITTING FRACTURE MORPHOLOGY hardened steels
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ROLLING CONTACT FATIGUE BEHAVIOR OF CERAMIC BALLS LUBRICATED BY LUBRICANTS WITH EXTREME PRESSURE ADDITIVES 被引量:1
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作者 ZHANG Feng S0NG Baoyu +1 位作者 QU Jianjun LIU Weimin 《Chinese Journal of Mechanical Engineering》 SCIE EI CAS CSCD 2006年第2期195-199,共5页
An experiment is conducted to investigate the effects of lubricant10#, which contains extreme pressure additives T304 and T305, on the rolling contact fatigue (RCF) life of the contact pairs of a Si3N4 ceramic ball ... An experiment is conducted to investigate the effects of lubricant10#, which contains extreme pressure additives T304 and T305, on the rolling contact fatigue (RCF) life of the contact pairs of a Si3N4 ceramic ball and a steel rod. The experimental investigation is carried out using a ball-rod RCF test rig. The results show that the extreme pressure additives increase the anti-contact-fatigue performance of ceramic balls; When the content of the additives varies from 1% to 5%, the increasing gradient of the RCF life curve decreases; And the oil sample with 1% T305 additive corresponds to the maximal gradient of the RCF life curve, with the RCF life being increased by about 10.77 times. The fatigue surface of the ceramic ball is analyzed with scanning electron microscope (SEM) and X-ray electron dispersion analysis(EDAX), and the physical model of extreme pressure additives' increasing the RCF life of the ceramic ball is proposed. It is found that the extreme pressure additives form a corrosive film and a transfer film on the surface of the ceramic ball, which decrease the surface tangential stress, and to increase the surface energy is the most effective means for increasing the RCF life. 展开更多
关键词 Ceramic bearing Si3N4 ceramic rolling contact fatigue Extreme pressure additive
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Investigation of the Relation between Rolling Contact Fatigue Property and Microstructure on the Surface Layer of D2 Wheel Steel 被引量:3
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作者 Shuaishuai Wang Xiujuan Zhao +3 位作者 Pengtao Liu Jinzhi Pan Chunhuan Chen Ruiming Ren 《Materials Sciences and Applications》 2019年第8期509-526,共18页
Through the rolling contact fatigue experiment under the condition of the lubricating oil, this article investigated the relation between contact fatigue property and microstructure on the surface layer of D2 wheel st... Through the rolling contact fatigue experiment under the condition of the lubricating oil, this article investigated the relation between contact fatigue property and microstructure on the surface layer of D2 wheel steel. The results showed that although the roughness of the original specimen induced by mechanical processing would diminish to some extent in the experiment, the 0.5 - 1.5 μm thick layer of ultrafine microstructure on the original mechanically-processed specimen surface would still become micro-cracks and small spalling pits due to spalling, and would further evolve into fatigue crack source. Additionally, even under the impact of the load that was not adequate to make the material reach fatigue limit, the ferrite in the microstructure underwent plastic deformation, which led the refinement of proeutectoid ferrite grains. During the experiment, the hardening and the refinement caused by plastic deformation consisted with the theory that dislocation gave rise to plastic deformation and grain refinement. The distribution laws of hardness and ferrite grain sizes measured could be explained by the distribution law of the shearing stress in the subsurface. 展开更多
关键词 D2 Wheel Steel rolling contact fatigue Property MICROSTRUCTURE Evolution of the Surface Layer The Formation and Propagation of contact fatigue Cracks
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The Effects of Different Post-Heat Treatments on Rolling Contact Fatigue Behaviors of Direct Laser Cladding Inconel 625 Coatings 被引量:1
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作者 Qiaoxin Zhang Rui Chen +2 位作者 Ding Jin Chen Zhou Xuewu Li 《Journal of Renewable Materials》 SCIE EI 2021年第1期129-144,共16页
In this paper,the microstructures and rolling contact fatigue behaviors of laser cladding Inconel 625 coatings with or without post-heat treatments were analyzed.The results revealed that the fatigue resistance of the... In this paper,the microstructures and rolling contact fatigue behaviors of laser cladding Inconel 625 coatings with or without post-heat treatments were analyzed.The results revealed that the fatigue resistance of the laser cladding coating after any post-heat treatment was worse than that of the as-deposited coating.First,through the finite element analysis,the distribution of stress along the thickness direction of the coating was obtained,and it was concluded that the bonding interface between the coating and the matrix had little effect on the fatigue properties of the coating.Then X-ray diffraction(XRD),scanning electron microscopy(SEM)and energy dispersive spectrometry(EDS)were used to analyze the microstructure and failure morphology.The results revealed that the subsurface failure morphology of the coatings showed a consistent correlation with rolling fatigue property after different heat treatments.The TCP phase and carbides have been shown in the laser cladding coating.The coating after stress relieved annealing exhibited chain-shaped granular carbides on the grain boundaries which could accelerate crack propagation.The aging heat treatment made small amounts of Laves phase dissolved in the coating,while the dispersed phase was precipitated which could result in the formation of pores.And the solution treatment made large amounts of Laves phase dissolved,while the rod-shape brittle phases were generated which was easy to fracture and contribute to crack initiation and spalling. 展开更多
关键词 Laser cladding Inconel 625 coating heat treatment rolling contact fatigue microstructure
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Life prediction for rolling contact fatigue crack initiation of kiln wheels 被引量:1
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作者 Shen Yiping Wang Songlai +1 位作者 Li Xuejun B. S. Dhillon 《Engineering Sciences》 EI 2010年第4期58-64,共7页
This paper investigates the rolling contact fatigue of kiln wheels with respect to the axis line deflection, which is linear with the applied supporting loads on wheels. Fatigue crack initiation criteria for elastic s... This paper investigates the rolling contact fatigue of kiln wheels with respect to the axis line deflection, which is linear with the applied supporting loads on wheels. Fatigue crack initiation criteria for elastic shakedown, plastic shakedown and ratcheting material responses are applied to assess wheels responses with two sets of axial line deflection. The finite element simulations are performed by using the bilinear material mode for nonlinear and kinematic hardening in ANSYS 11.0. By comparing the results from different critera, it is showed that the low-cycle fatigue is the predominated failure. Results from different axial line deflections indicate that the optimum adjustment can greatly enhance the whole life of the supporting structure. 展开更多
关键词 rolling contact fatigue crack initiation finite element simulation axis line deflection shakedown map
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A Cumulative Damage Reliability Model on the Basis of Contact Fatigue of the Rolling Bearing
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作者 HUANG Li (School of Mechanical&Electrical Engineering,Wuhan University of Technology,Wuhan 430070,China) 《武汉理工大学学报》 CAS CSCD 北大核心 2006年第S1期367-370,共4页
A cumulative damage reliability model of contact fatigue of the rolling bearing is more identical with the actual conditions. It is put forward on the basis of contact fatigue life probability distribution of the roll... A cumulative damage reliability model of contact fatigue of the rolling bearing is more identical with the actual conditions. It is put forward on the basis of contact fatigue life probability distribution of the rolling bearing that obey Weibull distribution and rest on the Miner cumulative damage theory. Finally a case is given to predict the reliability of bearing roller by using these models. 展开更多
关键词 rolling BEARING reliability model CUMULATIVE DAMAGE contact fatigue
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Rolling-contact-fatigue behavior in backup roll of 5% Cr forged steel
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作者 WEN Hongquan QIN Xiaofeng WU Qiong 《Baosteel Technical Research》 CAS 2018年第1期41-46,共6页
With a focus on the backup roll, a rolling-contact-fatigue experiment was performed on samples of 5% Cr forged steel. The P-S-N fatigue curves were determined and the fatigue strength was calculated. The emergence of ... With a focus on the backup roll, a rolling-contact-fatigue experiment was performed on samples of 5% Cr forged steel. The P-S-N fatigue curves were determined and the fatigue strength was calculated. The emergence of cracks on the test-sample surfaces was observed at different fatigue cycles. A micro-hardness tester was used to measure the hardness of the subsurface fatigue layer. The microstructures were analyzed at various magnifications with an optical microscope, scanning electron microscope, and transmission electron microscope. Based on these tests, the rolling-contact-fatigue mechanism of the large forged steel backup roll was also considered. The results showed that the contact-fatigue strength of the tested backup roll steel was 1 249 MPa;the surface fatigue crack lengthened continuously as the number of cycles increased and followed an S-shaped curve; the subsurface fatigue hardness reached its highest value at about 90 (HV) increment from the matrix hardness of 540 (HV) in the backup roll; the subsurface martensite/bainite microstructure was crushed and the dislocation density was greatly increased. Under alternating contact stresses,the surface/subsurface material was damaged and exhibited many microdefects. At the least, the surface fatigue layer on backup rolls should be fully removed before the microcracks enter a period of rapid propagation. 展开更多
关键词 contact fatigue fatigue property crack propagation microstmcture failure mechanism 5% Cr forged steel backup roll
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Rolling contact fatigue nondestructive testing system for a bearing inner ring based on initial permeability
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作者 Dai Xianze Shuai Liguo Liu Jie 《Journal of Southeast University(English Edition)》 EI CAS 2019年第3期310-317,共8页
Due to the fact that rolling contact fatigue is not easily detected, and residual life is not easily evaluated in the early stage of bearing life, a nondestructive testing method based on initial permeability is propo... Due to the fact that rolling contact fatigue is not easily detected, and residual life is not easily evaluated in the early stage of bearing life, a nondestructive testing method based on initial permeability is proposed. By analyzing the crack propagation mechanism, a fatigue state detection system based on differential signals is designed. A simulation model of the detection of the inner ring of the pulse signal is established by using the electromagnetic field simulation software. The effects of the height of the coil, the inner and outer diameter, the number of coil turns, the diameter and the height of the ferrite core of the probe on the differential value of the detection signal are simulated. The parameter combination of the maximum difference value of the signal is used as the structural size of the sensor, and the detection sensor is designed and fabricated. Moreover, the bearing fatigue test system is designed, and the bearing is tested. The results show that the system has good detection ability for rolling contact fatigue and verifies the mechanism and trend of crack propagation in the inner ring of the bearing. 展开更多
关键词 initial permeability nondestructive testing rolling contact fatigue.
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Optimization of Preventive Grinding of Backup Roll against Contact Fatigue Cracking 被引量:3
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作者 DOUPeng LIYou-guo LIANGKai-ming BAIBing-zhe 《Journal of Iron and Steel Research International》 SCIE CAS CSCD 2005年第3期28-33,45,共7页
In order to optimize the current grinding procedure of the backup roll of 2050 continuously variable crown (CVC) mills, the behavior of rolling contact fatigue (RCF) cracking was investigated. Two RCF short cracks, in... In order to optimize the current grinding procedure of the backup roll of 2050 continuously variable crown (CVC) mills, the behavior of rolling contact fatigue (RCF) cracking was investigated. Two RCF short cracks, including vertical short crack and ratcheting short crack initiated from ratcheting, were observed. The behavior of both RCF cracks was analyzed in detail. Then a modified grinding procedure was proposed according to the behavior of RCF cracks and the preventive grinding strategy. 展开更多
关键词 rolling contact fatigue short crack vertical short crack ratcheting short crack 2050 CVC hot rolling mill preventive grinding
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Exploring the ultrahigh rolling contact fatigue life of M50 bearing steel by adjusting the cryogenic sequence
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作者 Xin Cai Xiaoqiang Hu +3 位作者 Xingyu Lu Hongwei Liu Yanfei Cao Dianzhong Li 《Journal of Materials Science & Technology》 SCIE EI CAS CSCD 2024年第2期243-250,共8页
The influence of different cryogenic sequences on the rolling contact fatigue(RCF)life of M50-bearing steel has been studied.The results show that direct cryogenic treatment after quenching can effectively improve RCF... The influence of different cryogenic sequences on the rolling contact fatigue(RCF)life of M50-bearing steel has been studied.The results show that direct cryogenic treatment after quenching can effectively improve RCF life.The L_(10)life is strikingly 5 times longer than that with cryogenic treatment after tem-pering.This is caused by the distinct lattice construction of martensite and the transformation of retained austenite.More secondary nanocarbides and fine twins are formed via cryogenic treatment before tem-pering compared with cryogenic treatment after tempering.The improvement in the RCF life of the steel is attributed to the joint effects of the secondary nanocarbides and twin boundaries with a width of 5-13 nm,which delays significantly crack initiation and propagation.This study highlights a common method to improve the service life of high-carbon and high-alloy steels by adjusting the cryogenic se-quence. 展开更多
关键词 M50 steel Cryogenic treatment rolling contact fatigue life CARBIDE TWIN
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Multiaxial fatigue life prediction of kiln roller under axis line deflection 被引量:1
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作者 沈意平 王送来 +1 位作者 李学军 B.S.DHILLON 《Applied Mathematics and Mechanics(English Edition)》 SCIE EI 2010年第2期205-214,共10页
This paper investigates the multiaxial fatigue life of the roller in rolling contact with wheels with respect to axis line deflection. The multiaxial fatigue criteria proposed by Wang and Brown, together with the raln... This paper investigates the multiaxial fatigue life of the roller in rolling contact with wheels with respect to axis line deflection. The multiaxial fatigue criteria proposed by Wang and Brown, together with the ralnflow counting method and Miner- Palmgren's rule, are applied to the cumulative damage estimation and life prediction. As the axis line deflection of overlong kilns generally results in asymmetric load distribution on each roller, the load ratio is introduced to describe the deflection for quantitative stress analyses. The stress analyses are performed within the finite element code ANSYS. The tangential friction stress is calculated in terms :of the condition of the rolling contact area. By taking one roller as an example, the plotted fatigue life versus load ratio curve discovers how the axis line deflection affects the fatigue life. This study is significant to prevent the fatigue failure of the roller and can provide basis to adjust and optimize the axis line of the rotary kiln. 展开更多
关键词 multiaxial fatigue fatigue life axis. line deflection rolling contact
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Effects of Primary Carbide Size and Type on the Sliding Wear and Rolling Contact Fatigue Properties of M50 Bearing Steel 被引量:1
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作者 Liqi Yang Weihai Xue +5 位作者 Siyang Gao Yanfei Cao Hongwei Liu Deli Duan Dianzhong Li Shu Li 《Acta Metallurgica Sinica(English Letters)》 SCIE EI CAS CSCD 2023年第8期1336-1352,共17页
The influences of primary carbide size and type on the sliding wear behavior and rolling contact fatigue (RCF) properties of M50 bearing steel were systematically investigated under oil lubrication condition. A major ... The influences of primary carbide size and type on the sliding wear behavior and rolling contact fatigue (RCF) properties of M50 bearing steel were systematically investigated under oil lubrication condition. A major breakthrough was achieved in the influence of primary carbide on tribological behavior. The opposite effect brought by primary carbide size on the sliding wear resistance and RCF life of M50 bearing steel was determined. Wear resistance increased with an increase in the studied primary carbide size, whereas RCF life decreased significantly. Compared with the 0 R and R positions with a relatively small carbide size, the wear volume of the 1/2 R position with a large carbide size was the smallest. Compared with the 0 R and R positions, the L10 life of the 1/2 R position decreased by 82.7% and 84.8%, respectively. On the basis of the statistical correlation between primary carbide size and the two tribological properties, a critical maximum carbide size of 5-10 μm was proposed to achieve optimal tribological performance. This research suggests that the equivalent diameter of the primary carbide should be controlled to be smaller than 10 μm, but further decreasing primary carbide size to less than 5 μm is unnecessary. The influence of primary carbide type in M50 bearing steel on sliding wear resistance was also discussed. Results indicate that the MC-type carbides with higher elastic modulus and microhardness exhibit better wear resistance than the M2C-type carbides. 展开更多
关键词 Carbide size Carbide type Sliding wear rolling contact fatigue M50 bearing steel
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高速钢轨RCF裂纹涡流检测仿真系统及应用 被引量:1
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作者 于亚婷 袁飞 +1 位作者 熊龙辉 田贵云 《计算机仿真》 北大核心 2023年第8期146-153,共8页
高速钢轨滚动接触疲劳(Rolling Contact Fatigue:RCF)裂纹是高铁钢轨主要损伤之一,而电涡流无损检测是检测铁磁性材料中裂纹最有效的方法之一。为深入理解电涡流无损检测中电场和磁场的耦合关系,以及静态和高速运行状态下钢轨中电磁场... 高速钢轨滚动接触疲劳(Rolling Contact Fatigue:RCF)裂纹是高铁钢轨主要损伤之一,而电涡流无损检测是检测铁磁性材料中裂纹最有效的方法之一。为深入理解电涡流无损检测中电场和磁场的耦合关系,以及静态和高速运行状态下钢轨中电磁场的分布,联合MATLAB、ANSYS Maxwell和数据库技术构建了基于.NET技术的高铁RCF裂纹电涡流检测评估仿真系统。其分别由钢轨RCF裂纹的静态电磁场解析计算模块、高速钢轨RCF裂纹直流电磁无损检测2D仿真模块和高速钢轨RCF裂纹直流电磁无损检测3D仿真模块构成。最后将该仿真系统应用到钢轨RCF裂纹静态和动态磁场的计算中,为电涡流无损检测正逆向问题研究、高速钢轨中RCF裂纹的定量检测方法、涡流检测装置设计和试验验证提供支持。 展开更多
关键词 电涡流检测与评估 钢轨滚动疲劳接触裂纹 快速求解 仿真系统
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Modeling Stress Intensity Factor of Rail Steel under Situation of Growing Fatigue Crack—A Novel Technique
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作者 Upamanyu Banerjee 《Open Journal of Metal》 2012年第3期74-78,共5页
Simulation of stress intensity factor as function of rolling contact fatigue cracks of railway tracks and the vehicle load is made with the help of COMSOL Multiphysics software. It is found that the critical stress in... Simulation of stress intensity factor as function of rolling contact fatigue cracks of railway tracks and the vehicle load is made with the help of COMSOL Multiphysics software. It is found that the critical stress intensity factor i.e. 41.6 MPa. m1/2 is reached at a stress level of 32 MPa and at the crack size 11.5 × 10-2 m.Noting the power law variation of acoustic emission count with increase in crack size (analogous to Paris Law), the simulation was further carried out to model the dependence of measured AE count with the stress intensity factor ahead of a growing RCF crack tip. It is demonstrated that AE measurement can be effective to trigger a control loop for avoidance of fatigue failure of railway track. In view of potential difference in the intensity of back scattered light from surface irregularities, a model is developed to find out the threshold intensity of scattered light that insures safety in the railway system against fatigue failure. 展开更多
关键词 Stress INTENSITY Factor Acoustic Emission SCATTERING rolling contact fatigue CRACK Growth
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Failure Analysis of a Helical Gear in a Gearbox Used in a Steel Rolling Mill
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作者 Samroeng Netpu Panya Srichandr 《材料科学与工程(中英文B版)》 2012年第4期289-294,共6页
关键词 螺旋齿轮 齿轮箱 轧钢厂 失效分析 齿面接触应力 过早失效 调查结果 疲劳断裂
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