arXiv 1210.09412012-10-02cond-mat.mtrl-sci

基于等幅疲劳数据的变幅应变寿命非线性损伤累积疲劳模型

A non-linear damage accumulation fatigue model for predicting strain life at variable amplitude loadings based on constant amplitude fatigue data

S. P. Beckman, P. J. Huffman

备注：: 7 pages, 10 figures

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摘要：

提出了一种新的唯象技术，利用恒幅加载数据从变幅应变历史预测疲劳寿命。这种逐反转模型的一个关键特征是损伤累积本质上是非线性的。通过近似累积损伤来自具有特定变幅反转的应变范围的恒幅加载来预测变幅加载历史中反转的损伤。这种方法的一个关键特征是，在应变历史开始时的过载比在循环寿命结束时施加的过载对总寿命的影响更大。该技术有效地将应变历史的损伤预测，并具有优于其他方法的优点，因为有没有拟合参数，需要大量的实验数据。这里提出的模型进行了验证，使用实验变幅疲劳数据为三种不同的金属。

英文摘要：

A new phenomenological technique for using constant amplitude loading data to predict fatigue life from a variable amplitude strain history is presented. A critical feature of this reversal-by-reversal model is that the damage accumulation is inherently non-linear. The damage for a reversal in the variable amplitude loading history is predicted by approximating that the accumulated damage comes from a constant amplitude loading that has the strain range of the particular variable amplitude reversal. A key feature of this approach is that overloads at the beginning of the strain history have a more substantial impact on the total lifetime than overloads applied toward the end of the cycle life. This technique effectively incorporates the strain history in the damage prediction and has the advantage over other methods in that there are no fitting parameters that require substantial experimental data. The model presented here is validated using experimental variable amplitude fatigue data for three different metals.

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