Fatigue and Fatiguelimits of Thin-walled Composite Laminates in the VHCF Regime

根据纤维增强复合材料确实表现出相关的高周疲劳行为这一研究假设，该项目旨在回答由先前的SPP1466得出的几个基本问题。耐力有极限吗？观察到的VHCF过程(完全反向加载，R=-1)是否也在重复加载(R=0)下生效，结果是否可以转移？是否可以将高频弯曲下的损伤起始行为与循环拉伸/压缩试验中发现的起始行为进行比较/联系？VHCF损伤的启动能否用Carraro和Quaresimin提出的理论来描述[11]？可以通过纳米颗粒来改善损伤引发行为吗？在下文中提出了一套全面的实验测试方案。实验将得到分析和数值模拟的补充。

Following the research hypothesis that fiber-reinforced composites do show a relevant very high cycle fatigue behavior, this project aims to answer several fundamental questions derived from the previous SPP1466. Is there an endurance limit? Do the observed VHCF processes (fully reversed loading, R=-1) also come into effect under repeated loadings (R=0) and can results be transferred? May damage initiation under high-frequency bending be compared/linked to the initiation behavior found in cyclic tension/compression tests? Can VHCF damage initiation be described by the theory presented by Carraro and Quaresimin [11]? Can the damage initiation behavior be improved by means of nano particulates? A comprehensive experimental test program is proposed in the following. Experiments will be complemented by analytical- and numerical simulations.