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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...

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

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

Effects of Strain Ratio on fatigue Behavior of G20Mn5QT Cast Steel

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Transactions of Tianjin University 2016年第4期22卷 302-307页

作者：韩庆华郭琪尹越邢颖 School of Civil Engineering Tianjin University Key Laboratory of Coast Civil Structure and Safety of Ministry of Education Tianjin University

Due to traffic and wave actions, cast steel joints are subjected to variable-amplitude fatigue loading, which may cause fatigue problems. The ratio of the minimum strain to the maximum strain(strain ratio)can be employed to analyze the influence of variable-amplitude fatigue both in the elastic and plastic ranges. To evaluate the effect of the strain ratio on G20Mn5 QT cast steel, the fatigue tests of smooth specimens were carried out at the strain ratio of 0.1. The cyclic deformation and the relationships between the strain amplitude, the stress amplitude, the Smith, Watson and Topper(SWT)parameter and fatigue life were studied and compared with those at the strain ratio of-1. Compared with other methods, Basquin formula and Solonberg formula provide reliable and appropriate ranges of S-N curve and fatigue limit at different strain ratios respectively. The SWT parameter can be used to predict the fatigue life at other strain ratios accurately.

关键词： fatigue test G20Mn5QT cast steel strain ratio fatigue life

Experimental Study on Medium and Low Cycle fatigue Properties of Cast Steel GS20Mn5V

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Journal of Shanghai Jiaotong university(Science) 2021年第6期26卷 765-773页

作者：靳慧莫建华孙思嘉赵静 Jiangsu Key Laboratory of Engineering Mechanics&Key Laboratory of Concrete and Prestressed Concrete Structures of Ministry of Education School of Civil EngineeringSoutheast UniversityNanjing 210096China

Owing to the remarkable advantages in mechanical behavior,cast steel nodes have been widely used in static ***,cast steel nodes also gain increasing popularity due to the superior fatigue performance in dynamic structures,but they are not yet widely used because the fatigue properties of cast steel are not well *** this paper,the fatigue test of cast steel GS20Mn5V commonly used in steel castings is carried *** strength of medium and low cycle fatigue and the fatigue limit are *** feasibility of the estimated S-N(fatigue stress versus life)curve is *** double logarithmic linear model(DLLM)and the reversed generalized Pareto model(RGPM)are used to fit the experimental data,and the comparison is *** P-S-N(the relationship between fatigue stress and life at different survival rates)curve obtained by the RGPM is *** results show that the estimated S-N curve is not suitable for low cycle fatigue life,fitting the experimental data with the RGPM is the best,and obtaining the P-S-N curve from the RGPM is feasible.

关键词： cast steel GS20Mn5V fatigue test double logarithmic linear model(DLLM) reversed generalize Pareto model(RGPM) S-N curve P-S-N curve

Study on the Bending fatigue of a Diesel Engine Crankshaft

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Study on the Bending Fatigue of a Diesel Engine Crankshaft