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Experimental investigation of the relation between the surface integrity and bending fatigue strength of carburized gears

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Science China(Technological Sciences) 2023年第1期66卷 33-46页

作者： CHEN DiFa ZHU JiaZan LIU HuaiJu WEI PeiTang MAO TianYu State Key Laboratory of Mechanical Transmissions Chongqing UniversityChongqing 400044China China Gas Turbine Establishment Chengdu 710025China

bending fatigue is an essential parameter that needs to be considered in the improvement process of the power density and reliability of gear drives. Quantitative relations among the manufacturing parameters, surface integrities, and fatigue performance are not clear, which seriously limits the effectiveness of an anti-fatigue design. For this work, tooth-bending fatigue tests of carburized gears with different surface integrities were performed using a pulsator. The effects of the manufacturing parameters and surface integrities on the gear fatigue, such as surface hardness and residual stress, were investigated. The experimental results revealed that due to the improvement of surface integrities after shot peening, the nominal bending stress number(fatigue limit) increased by 6.3%–31.1%, with an amplitude range of 39–143 MPa. A supervised learning algorithm of a random forest was implemented to determine the contribution of the surface hardness and surface residual stress to the nominal stress number. An empirical formula was proposed to predict the nominal stress number considering the surface integrities. The prediction error was less than 7.53%, as verified by several gear-bending fatigue tests. This provided theoretical support for the modern, anti-fatigue design of the gears.

关键词： carburized gear surface integrity bending fatigue design formula

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维普期刊数据库

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bending fatigue behavior of thin Zr_(61)Ti_(2)Cu_(25)Al_(12)bulk metallic glass beams for compliant mechanisms application

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Journal of Materials Science & Technology 2021年第30期89卷 1-15页

作者： Diao-Feng Li Ya-Long Yang Yong Shen Jian Xu Institute of Metal Research Chinese Academy of SciencesShenyang110016China School of Materials Science and Engineering University of Science and Technology of ChinaShenyang110016China

In this work,bending fatigue behavior of thinner Zr_(61)Ti_(2)Cu_(25)Al_(12)(ZT1)BMG beams with thicknesses of 500μm and 100μm were investigated with three-point bending(3PB),to evaluate the reliability and safety of this potentially material used in compliant mechanisms under cyclic bending *** endurance limits(FELs)of ZT1 beams with thicknesses of 500μm and 100μm were determined to be 470 MPa,and~0.3 of its tensile *** life and FEL of ZT1 beams in bending are substantially independent of the beam thickness,in the scale from 500μm down to 100μ*** cracks of all ZT1 beams initiated at the extrinsic microvoids,either indirectly derived from surface scratches during mechanical polishing or originated from as-cast ***,fatigue crack propagation behavior is highly related to the magnitude of cyclic stress *** interrupted fatigue tests,larger proportion about 60-70%of fatigue life was spent on crack propagation under high stress level,while crack initiation occupied larger proportion about 80-85%under low stress *** medium stress level of about 590 MPa almost shared the crack-initiation life and crack-propagation *** addition,there are two crack deflection mechanisms during cracks steady propagation *** mechanism is crack deflection along the interacted shear bands ahead of crack-tip,the other one is crack"jump"from one shear band to another shear band at a certain *** two mechanisms alternate dominate the crack propagation process,generating typical staircase-like crack propagation *** endurance limits of ZT1 beams in the form of either stress amplitude or strain amplitude are superior to traditional candidate materials in the field of compliant mechanisms,showing that the better reliability and larger deflection deformation can be achieved for flexible members made by ZT1 BMG even under cyclic loading.

关键词： Metallic glasses bending fatigue Crack initiation Crack propagation Compliant mechanisms

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Study on the bending fatigue of a Diesel Engine Crankshaft

Study on the Bending Fatigue of a Diesel Engine Crankshaft

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2014中国汽车工程学会年会

作者： Teng Shuai Wang Shufen Yao Zhangtao Li Zhongtai Guo Lei Li Hao Liu Jie China National Heavy Duty Truck Group Co. Ltd.R&D center College of Mechanical and Electronic Engineering Shandong University of Science and Technology

ISBN: (纸本)9783662450420

A finite element model of a diesel engine crankshaft is established with ANSYS and FE-SAFE *** the bending moment and fatigue life of crankshaft bending are *** the crankshaft bending fatigue test is carried out on test bench,both the simulation results of the finite element software and experimental results are consistent,and the results show that:the combination method of simulation software and bench test proves the journal fillet of crankshaft connecting rod is the weakest part of crankshaft bending fatigue,and it provides an important significance for the design and production of crankshaft.

关键词： crankshaft bending fatigue ANSYS/FE-SAFE fatigue test

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Study on the bending fatigue of a Diesel Engine Roller Rocker Arm Assembly

Study on the Bending Fatigue of a Diesel Engine Roller Rocke...

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2015中国汽车工程学会年会

作者： Teng Shuai Yao Zhangtao Yang Chenghui Wang Shufen Sun Wanyu Zhang Xiao Li Hao Research & Development Center China National Heavy Duty Truck Group Co.Ltd School of Automation & Electrical Engineering Lanzhou Jiaotong University College of Electrical Engineering Northwest University for Nationalities

A finite element model of a diesel engine roller rocker arm assembly is established by ANSYS and FE-safe *** the stress and bending fatigue life of roller rocker arm assembly are *** the bending fatigue test of roller rocker arm assembly is carried out on test bench,which is designed independently,both the simulation results of the finite element and experimental results are consistent,and the results show that;the combination method of simulation software and test proves the weakest part of roller rocker arm assembly in bending fatigue,and provides an important significance for the design and production of roller rocker arm assembly.

关键词： roller rocker arm assembly bending fatigue ANSYS/FE-safe fatigue experiment

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Study on bending fatigue life test and FEA Analysis of the Steel Wheel

Study on Bending Fatigue life test and FEA Analysis of the S...

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2009中国控制与决策会议

作者： Wang Guofeng~(1,2),Sun Huixue~1,Li Jian~1,Wang Yixiang~1 1.College of Mechanical Engineering,Yanshan University,Qin Huangdao,China,066004 2.College of Information Technology,Jilin Normal University,Si Ping,China,136000

＜正＞Based on the steel wheel bending fatigue bench test,the bending fatigue life FEA model for the wheel was *** wheel fatigue regions got in FEA analyses matched the actual test results *** works established a foundation for further study on wheel fatigue use FEA and provided a basis for the steel wheel’s design and manufacture, which also can enhance the products reliability and improve the products competitiveness in the market.

关键词： Wheel Bench Test bending fatigue fatigue life

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PROPAGATION OF SHORT fatigue CRACKS IN STEEL 16Mn

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Acta Metallurgica Sinica(English Letters) 1993年第2期6卷 107-110页

作者： WANG Weiming HUANG Yuhua XU Hao Northeast University of Technology.Shenyang,China Doctorate student,Post Box 175,Northeast University of Technology,Shenyang 110006,China Northeast Univ of Technology Shengang China

Small bar speeimens of steel 16Mn with blind-holes were fatigued under constant amplitude Ioadings on a rotathing bending fatigue *** crack propagation emanating from the blind-holes was *** on the experimental results,an expression of average propa- gation rate of short cracks was *** behavior of short crack propagation was discussed and the evoluation of sutrface sizes of short cracks with fatigue cycle number was al- so given.

关键词： steel 16Mn bending fatigue propagation rate statistical behavior

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Research on Flexural fatigue of Fiber Bundles for Lay-flat Hose

Research on Flexural Fatigue of Fiber Bundles for Lay-flat H...

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2012 China Functional Materials Technology and Industry Forum

作者： Zhong-yao Huang Li-hai Cai Jian-Xiong Yang POL Research Institute of General Logistics Department PLA

This paper studies the flexural fatigue performance for hose reinforcement layer fiber bundles including polyester fibers,para-aramid fiber and liquid crystal polyester *** fatigue life and changes of three fiber bundles strength during the course of fatigue development were *** of three fiber bundles was observed by scanning electron *** the analysis of the molecular structure of the three fibers,the Molecular chain flexibility is one of the main factors of impacting resistance to bending fatigue *** crystal polyester fiber bundles have excellent mechanical properties and the high strength retention in bending fatigue test, which is an ideal material for the production of high-strength hose.

关键词： flexural fatigue bending fatigue lay-flat hose collapsible hose polyester fiber para-aramid fiber liquid crystal polyester fiber

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