基于经典Von Mises应力的多轴等效应力修正方法研究

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振动与冲击 ›› 2015, Vol. 34 ›› Issue (23) : 166-170.

论文

白春玉齐丕骞牟让科曹明红

作者信息 +

Multiaxial equivalent stress Amendment Algorithm based on classical Von Mises stress

Bai Chunyu，Qi Piqian ，Mu Rangke，Cao Minghong,

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文章历史 +

摘要

基于经典Von Mises应力的等效准则在静力学中具有较好的适用性，但推广到动力学中会出现新的问题，机械的应用该经典等效方法进行多轴振动疲劳损伤计算可能会导致错误的结果。本文总结给出了几种经典Von Mises应力等效的修正方法，使之适用于噪声载荷产生的多轴振动疲劳问题。算例表明，修正后的Von Mises应力响应功率谱的峰值和各应力分量响应功率谱的峰值均在同一频段范围，且均位于结构基频附近，这和结构自身动特性及实际受载情况是相符的，使得修正后的等效应力具有实际的物理意义，且修正后的等效应力满足高斯分布，可在频域范围内应用现有模型解决多轴应力状态下的振动疲劳寿命预估问题。

Abstract

The classical Von Mises stress equivalent process is built by the concept of static equivalent stress and extended to dynamic conditions, furthermore some problems will appear, even an error result will be produced if using the equivalent criterion mechanically.In this paper ,the authors introduce some amendment algorithms based on classical Von Mises stress, the amendatory Von Mises equivalent stress power spectral density has the same distribution as the component of stress ,both of the stress response magnitude located near the mode frequency, this is reasonable for the structural dynamic feature and the circular load feature, and the modified stress is regarded as a Gaussian process, which can estimate fatigue life based existing models in the frequency domain.

导出引用

白春玉齐丕骞牟让科曹明红. 基于经典Von Mises应力的多轴等效应力修正方法研究[J]. 振动与冲击, 2015, 34(23): 166-170

Bai Chunyu，Qi Piqian,Mu Rangke，Cao Minghong,. Multiaxial equivalent stress Amendment Algorithm based on classical Von Mises stress[J]. Journal of Vibration and Shock, 2015, 34(23): 166-170

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