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首页> 外文期刊>Proceedings of the Institution of Mechanical Engineers. Part L, Journal of Materials: Design and Application >A new cumulative fatigue damage model under biaxial loading
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A new cumulative fatigue damage model under biaxial loading

机译：双轴载荷下的新累积疲劳损伤模型

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摘要

Criteria of fatigue damage play a key role in life prediction of structures subjected to random loadings. In previous works, a cumulative damage model called damage stress model was developed. This model takes into account not only the loading history but also the nonlinear evolution of damage. Damage stress model improved its predictive capability of fatigue life for several materials such as steels and aluminum alloys. In this paper, a new approach of cumulative damage, based upon the damage stress model parameter, is investigated for different loading paths under finite life regime. To build the new damage indicator, the damage stress model parameter is coupled with an equivalent stress formulated via Sines, Dang Van and Robert fatigue criteria, respectively. The relevance of the proposed model is examined using series of biaxial tests performed on cruciform specimens made of an aluminum alloy. Several types of loadings composed of constant amplitude fatigue, cumulative fatigue with two/three blocks and repeated blocks were set up. Good agreement is highlighted when the prediction, obtained with the proposed model, is compared to our experimental data.
机译：疲劳损伤的标准在经过随机载荷的结构的寿命预测中发挥着关键作用。在以前的作品中，开发了一种称为损伤压力模型的累积损伤模型。此模型不仅考虑了装载历史，还考虑了损坏的非线性演变。损伤压力模型改善了诸如钢和铝合金等几种材料的疲劳寿命的预测能力。本文研究了基于损伤应力模型参数的累积损伤的新方法，在有限寿命制度下进行了不同的负载路径。为了构建新的损伤指示器，损坏应力模型参数分别通过凸片，Dang Van和Robert疲劳标准配制的等效应力。使用在由铝合金制成的十字形标本上进行的一系列双轴试验来检查所提出的模型的相关性。建立了几种由恒压疲劳，具有两个/三个块和重复块的累积疲劳组成的若干类型的载荷。使用拟议模型获得的预测，与我们的实验数据进行比较时，突出显示良好的一致性。

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