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首页> 外文期刊>International journal of materials & product technology >Fatigue damage assessment of a car body-in-white using a frequency-domain approach
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Fatigue damage assessment of a car body-in-white using a frequency-domain approach

机译：用频域法评估白车身的疲劳损伤

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摘要

This work presents an application of a frequency-domain methodology developed for the fatigue damage and service life assessment of mechanical components under multiaxial random loadings. The road-induced random loadings in a virtual laboratory bench test (four post test rig) are determined using an integrated Multi-Body/Finite Element (MB/FE) analysis. A method (i.e. the variance method) based on the statistics of the observed multiaxial loadings is used to determine the critical direction. The shear stress resolved in the critical direction is then assumed as the reference loading for the subsequent fatigue analysis. A frequency-domain approach recently proposed in the literature (i.e. the non-Gaussian TB method), capable to include the load non-normality into the fatigue assessment procedure, is used to estimate the loading spectrum. A comparison between the observed and the estimated loading spectrum, extrapolated from shorter to longer time (e.g. the entire vehicle service life), is shown. The presented results show how the proposed methodology could be a very useful tool for the reliable and quick analysis of components under multiaxial random loadings.
机译：这项工作提出了一种频域方法论的应用，该方法是针对多轴随机载荷下机械部件的疲劳损伤和使用寿命评估而开发的。使用集成的多主体/有限元（MB / FE）分析来确定虚拟实验室基准测试（四个后期测试台）中道路产生的随机载荷。基于观察到的多轴载荷的统计数据的一种方法（即方差方法）用于确定临界方向。然后将在临界方向上分解的切应力假定为后续疲劳分析的参考载荷。最近在文献中提出的一种频域方法（即非高斯TB方法）能够将载荷非正态性纳入疲劳评估程序中，用于估算载荷谱。显示了从较短时间到较长时间（例如整个车辆使用寿命）推断的观察到的载荷谱与估计载荷谱之间的比较。给出的结果表明，所提出的方法如何成为在多轴随机载荷下可靠，快速地分析零件的非常有用的工具。

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