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Application of Life-Dependent Material Parameters to Fatigue Life Prediction under Multiaxial and Non-Zero Mean Loading

机译:寿命相关材料参数在多轴非零均值载荷下疲劳寿命预测中的应用

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摘要

This study presents the life-dependent material parameters concept as applied to several well-known fatigue models for the purpose of life prediction under multiaxial and non-zero mean loading. The necessity of replacing the fixed material parameters with life-dependent parameters is demonstrated. The aim of the research here is verification of the life-dependent material parameters concept when applied to multiaxial fatigue loading with non-zero mean stress. The verification is performed with new experimental fatigue test results on a 7075-T651 aluminium alloy and S355 steel subjected to multiaxial cyclic bending and torsion loading under stress ratios equal to = −0.5 and 0.0, respectively. The received results exhibit the significant effect of the non-zero mean value of shear stress on the fatigue life of S355 steel. The prediction of fatigue life was improved when using the life-dependent material parameters compared to the fixed material parameters.
机译:这项研究提出了与寿命有关的材料参数概念,该概念已应用到多个著名的疲劳模型中,以预测多轴和非零平均载荷下的寿命。证明了用与寿命相关的参数替换固定材料参数的必要性。本文的研究目的是验证应用于非零平均应力的多轴疲劳载荷时,与寿命有关的材料参数概念。验证是通过对7075-T651铝合金和S355钢进行新的实验疲劳试验结果进行的,它们分别在应力比分别等于-0.5和0.0的情况下经受多轴循环弯曲和扭转载荷。接收到的结果表明,剪应力的非零平均值对S355钢的疲劳寿命具有重大影响。与固定材料参数相比,使用与寿命相关的材料参数可改善疲劳寿命的预测。

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