Extension of the Classical Laminate Theory for Fatigue Life Prediction

疲劳寿命预测的经典层合板理论的扩展

• 批准号: 110018296
• 负责人: Professor Dr.-Ing. Helmut Schürmann
• 金额: --
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2009
• 资助国家: 德国
• 起止时间: 2008-12-31 至 2013-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/110018296?language=en
• 关键词: Extension; Classical; Laminate; Theory; Fatigue

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.

纤维增强复合材料的疲劳寿命预测目前在分析上不可行，因此设计工程师缺乏易于使用的计算工具或例程。在有关数学方法和实验研究的各种出版物的基础上，仅对主题的某些方面给出答案，彻底的研究是基于非线性刚度退化的疲劳寿命预测模型的开始的平台。由于工作载荷对 FRP 疲劳寿命的影响很大，环境影响和任意载荷和可变层压板堆叠顺序的结构设计预测尚未完全考虑。因此，平均应力、载荷序列效应和层的多轴行为等主要影响将被集成到当前模型中，并通过灵敏度分析进行评估。验证将通过使用文献数据以及具体实验来进行。参考手册应该可以帮助设计工程师确定疲劳寿命的尺寸。实验测试指南将使所需数据的实验标准化。