Extension of the Classical Laminate Theory for Fatigue Life Prediction

纤维增强复合材料的疲劳寿命预测目前在分析上是不可行的，因此设计工程师缺乏一个易于使用的工具或程序进行计算。在各种出版物的基础上的数学方法和实验研究，只给出了一些方面的问题的答案，一个彻底的研究是一个平台的基础上的非线性刚度退化的疲劳寿命预测模型的发病。由于工作载荷对FRP疲劳寿命的影响很大，目前还没有完全考虑任意载荷和不同铺层顺序对FRP疲劳寿命的影响和结构设计预测。因此，主要的影响，如平均应力，荷载序列效应和层的多轴性能将被集成在当前模型和评估通过敏感性分析。将使用文献数据和特定实验进行验证。参考手册应该帮助设计工程师确定疲劳寿命的尺寸。实验测试指南将标准化所需数据的实验。

The fatigue life prediction for fiber reinforced composites is currently analytically not viable hence the design engineer lacks an easy to use tool or routine for the calculation. On the basis of various publications on mathematical approaches and experimental investigations, giving only answers to some aspects of the topic, a thorough research was the platform for the onset of fatigue life prediction model on basis of non-linear stiffness degradations. Owing the great number of influences on the fatigue life of FRP through operating loads, environ-mental influences and structural design predictions for arbitrary loading and variable laminate stacking sequences are not completely considered yet. Therefore major influences as the mean stress, the load sequence effect and the multiaxial behavior of a layer will be integrated in the cur-rent model and evaluated via a sensitivity analysis. The validation will be carried out by using data from the literature as well as specific experiments. A reference manual is supposed to help the design engineer to dimension for fatigue life. A guideline for experimental testing will standardize the experiments for the required data.