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Investigation of the Influence of Viscoelastic Behaviour on the Lifetime of Short Fibre Reinforced Polymers

机译：粘弹性行为对短纤维增强聚合物寿命影响的研究

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Short fibre reinforced polymers are getting more important for structural applications. Becasue of lightweight actions, components are designed for a specific application and lifetime. The bearable numbers of cycles can be estimated using material data and models for the consideration of influence factors. Further static loadings affect material behaviour, which influences the component lifetime. Commonly used models are not able to capture these effects. Therefore, material tests, with different load sequences, on 40% short glass fibre reinforced polypropylene have been performed. These sequences are combinations of cyclic and static loads at different, defined levels. Our research shows a lifetime elongation or reduction of a polymer, depending on the amount of static load time and quantity. For a certain stress level, the time to failure can be elongated or shortened more than a decade by another stress level, as compared to pure cyclic load. Additionally, the stiffness development of the composite is investigated in order to capture the damage course. Accordingly, these effects needed to be considered in lifetime prediction.
机译：短纤维增强聚合物对结构应用更重要。切除轻量级动作，组件专为特定的应用程序和寿命而设计。可以使用材料数据和模型来估计可忍受的循环，以考虑影响因素。进一步的静载荷会影响物质行为，影响组件寿命。常用模型无法捕获这些效果。因此，已经进行了具有不同负载序列的材料试验，在40％短玻璃纤维增​​强聚丙烯上进行。这些序列是不同定义的水平的循环和静态载荷的组合。我们的研究表明，聚合物的寿命伸长或减少，这取决于静态负荷时间和量的量。对于某个压力水平，与纯环载相比，由于纯循环负荷相比，故障的时间可以被伸长或缩短超过另一个压力水平。另外，研究了复合材料的刚度发展，以捕获损伤过程。因此，在寿命预测中需要考虑这些效果。

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