基于损伤力学的考虑载荷序列的变幅载荷下疲劳寿命估计策略

Yahui Li, Yunxia Chen
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引用次数: 0

摘要

大多数机械和结构部件在其整个使用寿命期间通常受到变幅加载。在实际应用中,用固定幅值和应力比的循环块来近似荷载序列在计算上是有利的。但在许多情况下,单个荷载过程之间的相关特性对寿命评估的影响往往被忽略。本文首先回顾了应用于变幅加载的等效处置和寿命预测模型的历史成果。基于高斯耦合模型的思想,将疲劳寿命过程离散成块。用相关长度来描述相关性。然后引入基于Corten-Dolan累积损伤规则的改进模型,拟合出等效应力范围。利用处理好的应力序列,提出了一种基于损伤力学的寿命估计算法,该算法考虑了损伤场与应力场之间的耦合,推导出损伤演化方程。最后,将上述策略应用到一个实际案例中。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
A strategy for fatigue life estimation under variable amplitude loading in consideration of load sequence based on damage mechanics
Most mechanical and structural components are typically subjected to variable amplitude loading during their entire life. For practical purpose, it is computationally advantageous to approximate the load sequence by blocks of cycles with constant amplitude and stress ratio. But the indispensable influence on life evaluation of the correlation characteristics between individual load processes can be ignored in many cases. The paper first reviews the historical achievements on the equivalence disposal and life-prediction models applied for variable amplitude loading. Based on the idea of Gaussian copula type model, the fatigue life process can be discretized into blocks. The dependence character is described with correlation length. Then an ameliorated model based on Corten-Dolan accumulated damage rule is introduced to draw to the equivalent stress range. Using the disposed stress sequence, a life estimation algorithm based on damage mechanics is presented, during which the coupling between damage field and stress field is considered to deduce the damage evolution equation. Finally, the strategy discussed above is applied examplarily to a practical case.
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