Test Program Load Spectrum Compilation for Accelerated Life Test of Leaf Springs with Variable Stiffness

Abstract

Abstract: Considering characteristics of large deformation and nonlinear stiffness, a method of test program load spectrum compilation suitable for accelerated life test（ALT) of nonlinear leaf springs was presented. Based on the acceleration spectrum exposed to the leaf spring by road test, FEA method was used to obtain stress spectrum at any point. It is found that the amplitudes of stresses obey Weibull distribution，but the mean is not distributed as normal distribution or Weibull distribution. Based on the extrapolated spectrum, method of compilation and realization for bench test was studied. Compared to the results of road test, the compiled ALT program load spectrum is in accordance with the road tests.

Key words: nonlinear, leaf spring, accelerated life, loading spectrum

摘要： 考虑钢板弹簧总成大变形非线性刚度特性，提出一套适用于钢板弹簧总成的加速寿命试验程序载荷谱编制方法。通过实车试验采集了钢板弹簧总成载荷输入点的加速度载荷谱，结合有限元方法分析了簧片上任意一点的应力载荷谱，发现应力幅值服从Weibull分布，但均值不服从常规的正态分布或Weibull分布，基于获得的分布规律对此类型载荷谱编制方法及台架实现方式进行了探讨。对比发现，编制的加速寿命试验程序载荷谱能够很好地复现路试结果。

关键词: 非线性的, 钢板弹簧, 加速寿命, 载荷谱

CLC Number:

HAN Weiduo, LU Jianwei, LONG Daojiang. Test Program Load Spectrum Compilation for Accelerated Life Test of Leaf Springs with Variable Stiffness[J]. China Mechanical Engineering.

韩为铎, 卢剑伟, 龙道江. 变刚度钢板弹簧加速寿命试验程序载荷谱编制[J]. 中国机械工程.

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