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Prediction of Strain Fatigue Life of HRB400 Steel Based on Meso-Deformation Inhomogeneity

机译：基于细观变形不均匀性的HRB400钢应变疲劳寿命预测

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摘要

The relationship between strain fatigue life and evolution of meso-deformation inhomogeneity was studied, through the cyclic process of numerical simulation of crystal plasticity compared with the fatigue test of steel hot-rolled ribbed-steel bar 400 (HRB400). The statistical characterization parameters at grain level, including the standard deviation of the dot product of longitudinal stress and strain, the product of the macro stress and the standard deviation of the longitudinal strain, and the product of the macro stress ratio and the standard deviation of the longitudinal strain, were proposed and respectively applied to measure the meso-deformation inhomogeneity of materials. These parameters take the effect of peak stress into account, distinct from the pure strain statistical parameters. The numerical results demonstrate that the low-cycle fatigue life curves of materials are predictable using the new parameters as FIPs (fatigue indicator parameters), and the predictions are more rational than by utilizing the FIPs without considering the peak stress effect.
机译：通过对结晶塑性数值模拟的循环过程与钢热轧带肋钢筋400（HRB400）的疲劳试验进行比较，研究了应变疲劳寿命与细观形变不均匀性演变之间的关系。晶粒度的统计表征参数，包括纵向应力和应变的点积的标准偏差，宏观应力与纵向应变的标准偏差的乘积，宏观应力比与合金的标准偏差的乘积提出并分别应用纵向应变来测量材料的细观形变不均匀性。这些参数考虑了峰值应力的影响，与纯应变统计参数不同。数值结果表明，使用新参数作为FIP（疲劳指标参数）可以预测材料的低周疲劳寿命曲线，并且与不考虑峰值应力效应的FIP相比，预测更为合理。

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