In this work, a new approach is proposed for predicting the life to crack initiation in Short Fiber Reinforced Polymers (SFRPs) under cyclic loadings in the presence of notches, cut‐outs and stress concentrations. A multiscale model is presented, encompassing two length scales for correlating the applied loads to the local stress fields in the matrix. These are used for defining an effective stress for predicting the life to crack initiation, accounting for the simultaneous influence of the notch geometry, the fiber content, orientation and distribution. The criterion was successfully validated on a large set of experimental results.Highlights A new model is proposed for predicting fatigue crack initiation in notched SFRPs The model is based on a multiscale procedure Prediction is based on local matrix stresses averaged in a structural volume The model accounts for fiber orientation, distribution and notch geometry

中文翻译：

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模拟带缺口的短纤维增强聚合物的高周疲劳裂纹萌生

在这项工作中，提出了一种新方法来预测短纤维增强聚合物 (SFRP) 在存在缺口、切口和应力集中的循环载荷下裂纹萌生的寿命。提出了一个多尺度模型，包含两个长度尺度，用于将施加的载荷与矩阵中的局部应力场相关联。这些用于定义有效应力，以预测裂纹萌生的寿命，同时考虑切口几何形状、纤维含量、方向和分布的影响。该标准已在大量实验结果中成功得到验证。亮点 提出了一种预测缺口 SFRP 疲劳裂纹萌生的新模型 该模型基于多尺度程序 预测基于结构体积中平均的局部基体应力 该模型考虑了纤维取向、分布和缺口几何形状