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New fatigue test and Statistical Method for Metallic Materials Used in Vehicle Transmissions

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Journal of Beijing Institute of Technology 1999年第2期8卷 39-42页

作者：陈欣项昌乐北京理工大学车辆传动国家重点实验室

Aim To improve the efficiency of fatigue material tests and relevant statistical treatment of test data. Methods\ Least square approach and other special treatments were used. Results and Conclusion\ The concepts of each phase in fatigue tests and statistical treatment are clarified. The method proposed leads to three important properties. Reduced number of specimens brings to the advantage of lowering test expenditures. The whole test procedure has more flexibility for there is no need to conduct many tests at the same stress level as in traditional cases.

关键词： fatigue test statistical method test specimens

VIRTUAL fatigue test SYSTEM AND ITS KEY TECHNOLOGIES FOR CONSTRUCTION VEHICLES

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VIRTUAL FATIGUE TEST SYSTEM AND ITS KEY TECHNOLOGIES FOR CON...

fatigue Characterization on a Cast Aluminum Beam of a High-Speed Train Through Numerical Simulation and Experiments

2006年中国机械工程学会年会暨中国工程院机械与运载工程学部首届年会

作者： SUN Hongzhu, SHANG Jianzhong, CONG Nan, LIANG Keshan College of Mechatronics Engineering and Automation, National University of Defense Technology Changsha 410073, China,

By researching the fatigue and durability (F&D) tests of the construction vehicles (CV), the key technologies of the virtual fatigue test such as the virtual prototype modeling for construction vehicl

关键词： Virtual test construction vehicle fatigue test loads spectrum modal stress

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Chinese Journal of Mechanical Engineering 2021年第5期34卷 349-359页

作者： Weiyuan Dou Lele Zhang Haifeng Chang Haifeng Zhang Changqing Liu School of Mechanical Electronic and Control EngineeringBeijing Jiaotong UniversityBeijing 100044China National International Science and Technology Cooperation Base Beijing Jiaotong UniversityBeijing 100044China CRRC Changchun Railway Vehicles Co. Ltd.Changchun 130062China

The cast aluminum beam is a key structure for carrying the body-hung traction motor of a high-speed train;its fatigue property is fundamental for predicting the residual life and service mileage of the *** characterize the structural fatigue property,a finite element-based method is developed to compute the stress concentration factor,which is used to obtain the structural fatigue strength reduction factors.A full-scale fatigue test on the cast aluminum beam is designed and implemented for up to ten million cycles,and the corresponding finite element model of the beam is validated using the measured data of the *** results show that the maximum stress concentration occurs at the fillet of the supporting seat,where the structural fatigue strength reduction factor is 2.45 and the calculated fatigue limit is 35.4 ***,no surface cracks are detected using the liquid penetrant *** the experimental and simulation results indicate that the cast aluminum beam can satisfy the service life requirements under the designed loading conditions.

关键词： High-speed train Cast aluminum beam fatigue test Stress concentration fatigue strength reduction factor

Individual aircraft life monitoring： An engineering approach for fatigue damage evaluation

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Chinese Journal of Aeronautics 2018年第4期31卷 727-739页

作者： Rui JIAO Xiaofan HE Yuhai LI School of Aeronautic Science and Engineering Beihang University Beijing 100083 China A viation Industry Corporation of China Beijng 100022 China

Individual aircraft life monitoring is required to ensure safety and economy of aircraft structure, and fatigue damage evaluation based on collected operational data of aircraft is an integral part of it. To improve the accuracy and facilitate the application, this paper proposes an engineering approach to evaluate fatigue damage and predict fatigue life for critical structures in fatigue monitoring. In this approach, traditional nominal stress method is applied to back calculate the S-N curve parameters of the realistic structure details based on full-scale fatigue test data. Then the S-N curve and Miner＇s rule are adopted in damage estimation and fatigue life analysis for critical locations under individual load spectra. The relationship between relative small crack length and fatigue life can also be predicted with this approach. Specimens of 7 B04-T74 aluminum alloy and TA15 M titanium alloy are fatigue tested under two types of load spectra, and there is a good agreement between the experimental results and analysis results. Furthermore, the issue concerning scatter factor in individual aircraft damage estimation is also discussed.

关键词： fatigue damage fatigue monitoring fatigue test Scatter factor S-N curve

Research and Analysis on Tensile and Compressive fatigue Performance of Cryogenic Axial Insulation Breaks

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Plasma Science and Technology 2013年第7期15卷 716-720页

作者：吴诚潘皖江 Institute of Plasma Physics Chinese Academy of Sciences

The composite axial insulation breaks （IBs） are key components of the supercon- ducting magnet system for the international thermonuclear experimental reactor （ITER）. In order to ensure the safe operation of the IBs during the 20 year lifespan of ITER devices, tensile and compressive fatigue tests were conducted by simulating actual working conditions and optimizing the test programs. The IBs were evaluated by testing their helium tightness after mechanical fatigue tests. In addition, fatigue analysis was performed using ANSYS software and an experi-mental S-N curve. The test data showed that the maximum helium leakage rate was less than 1.0×10^-9 Pc· m^3/s, which met the design requirements of the ITER IBs. ANSYS analysis results are also consistent with the test results from the theoretical viewpoint.

关键词： axial insulation break helium tightness property fatigue test

Application of fiber Bragg grating based strain sensor in pipeline vortex-induced vibration measurement

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Science China(Technological Sciences) 2014年第9期57卷 1714-1720页

作者： REN Liang JIA ZiGuang HO Michael Siu Chun YI TingHua LI HongNan School of Civil and Hydraulic Engineering Dalian University of Technology Department of Mechanical Engineering University of Houston

The vortex-induced vibrations(VIV)is an important topic of study in many different scientific and engineering *** VIV can be of benefit in some cases,oftentimes,it is an undesirable phenomenon that can be quite *** particular for offshore pipelines,VIV can lead to fatiguing of the pipe structure and can cause disastrous consequences if left unchecked.A number of different methods have been applied to the measurement of VIV,especially for the elongated,thin cylindrical *** use of fiber optic fiber Bragg gratings(FBGs)in particular has gained popularity over the recent years due to their distinct ***,FBGs are also very fragile and are susceptible to failure when placed in harsh environments without *** this paper,56 FBGs encapsulated in stainless steel tubes were applied to the measurement of VIV in a28-m model pipeline under controlled and uncontrolled *** show that the encapsulated sensors possessed good sensitivity as well as fatigue life(>80000 cycles).The measurements from FBGs were also high enough to allow frequency domain analysis of the pipeline VIV under the two *** authors conclude that the encapsulated FBGs are a viable tool for the study of VIV in pipeline structures.

关键词： vortex-induced vibration (VIV) fiber Bragg grating (FBG) fatigue test pipeline experiment vibration control equip-ment

Repair Effect of Hot Work Tool Steel by Laser-Melting Process

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Journal of Materials Science & Technology 2003年第z1期19卷 91-93页

作者： Yahong SUN Satoshi HANAKI Hitoshi UCHIDA Hisakichi SUNADA Nobuhiro TSUJII Graduate School of Engineering Himeji Institute of Technology 2167ShoshaHimeji 671-2201Japan Technical Research Laboratories Sanyo Special Steel Co.LTD.3007NakajimaShikama-kuHimeji 672-8677Japan

Both wear and crack due to heat checking in hot work tool steel are major failure *** is desirable to find amethod to lengthen the tool life while reducing manufacturing *** paper suggests a method to improve toollife for hot work tool steel(SKD6)with crack by laser-melting *** method has been evaluated using theimpact and fatigue test *** is demonstrated that a repair of the crack by a laser-melting process is effectivefor life extension of the damaged tool.

关键词： Hot work tool steel Laser-melting process Impact test fatigue test Fractography

fatigue LIVES FOR INDUCTION HARDENED SHAFTS MATERIALS ACCORDING TO THE ENVIRONMENTAL TEMPERATURES

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Acta Metallurgica Sinica(English Letters) 2005年第5期18卷 585-593页

作者： D.G. Lee K.C. Jang J.M. Kuk I.S. Kim Korea Institute of Industrial Technology Gwangju 506-824 Korea Dept. of Mechanical Engineering Mokpo National University Mokpo 534-729 Korea

Rotary bending fatigue tests were carried out with two kinds of materials, S43C and S50C, using the front engine and front drive shaft （FF shaft） of vehicle. The specimens were induction hardened about 1.0mm depth from the specimen surface, and the hardness value on the surface was about HRC56-60. The tested environment temperatures were -30, 25 and 80℃ in order to look over effect of the induction hardening and the environmental temperatures on the fatigue characteristics. The fatigue limit of induction hardened specimens increased more about 45% than non-hardened specimens showing that the endurances of S43C and S50C were 98.1 and 107.9MPa in non-hardened samples, 147.1 and 156.9MPa in hardened samplesrespectably. The maximum tensile and compressive stress on the small circular defect was about ＋250 and -450MPa respectively when circular defect is situated on top and bottom. The fatigue life increased 80, 25 and -30℃ in order regardless of hardening. In comparison of the fatigue lives on the basis of tested result at 25℃, the fatigue lives of non-hardened specimens decreased about 35%, but that of hardened specimens decreased about only 5% at 80℃ more than at 25℃. And fatigue life of non-hardened and hardened specimens were about 110% and 120% higher at -30℃ than that of 25℃. Based on the result of stress distribution near the defect, the tensile and compressive stress repeatedly generated by load direction were the largest on the small circular defect due to the stress concentration.

关键词： induction hardening fatigue test front engine and front drive shaft,fatigue crack fatigue life fatigue life ratio

Flexural fatigue Behavior of Layered Hybrid Fiber Reinforced Concrete

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Journal of Wuhan University of Technology(Materials Science) 2007年第3期22卷 560-563页

作者：王佶 Hubei Key Laboratory of Roadway Bridge and Structural Engineering Wuhan University of Technology

In order to obtain the fatigue life of layered hybrid fiber reinforced concrete （LHFRC） at different stress levels, flexural fatigue tests were carried out on specimens. The relation between fatigue lives and stress levels was simulated using the two-parameter Weibull distribution. Furthermore, both single- logarithmic and double-logarithmic regressive equations of various reliabilities were derived. It is evident that LHFRC gets the advantage of longer fatigue life over common concrete.

关键词： layered hybrid fiber reinforced concrete(LHFRC) flexural intensity fatigue test fatigue equationion