首页> 外文会议>SEM IX International Congress on Experimental Mechanics June 5-8, 2000 Orlando, Florida >Prediction of Time Dependent Failure in Polymers and Polymer Matrix Composites
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Prediction of Time Dependent Failure in Polymers and Polymer Matrix Composites

机译:聚合物和聚合物基复合材料的时间相关失效预测

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摘要

Engineering structures are most often designed to last for many years. It is not unusual for buildings, bridges, water systems, etc. to be designed for as long as 50 years. When materials such as steel or concrete are used, the principle concern relative to lifetime is associated with fatigue and corrosion. On the other hand, when polymers are used either alone or as the matrix component of polymer matrix composites (PMC), another concern arises due to the viscoelastic or the inherent time dependent nature of the mechanical properties of the material. That is, strength as well as moduli or stiffnesses change as a function of time due to the intrinsic or memory character of the molecular structure of the particular polymer being used.
机译:工程结构通常被设计为可以使用很多年。设计建筑物,桥梁,供水系统等长达50年的情况并不少见。当使用诸如钢或混凝土的材料时,与寿命有关的原理问题与疲劳和腐蚀有关。另一方面,当单独使用聚合物或将其用作聚合物基质复合材料(PMC)的基质组分时,由于材料的机械性能的粘弹性或固有的时间依赖性,会引起其他问题。也就是说,由于所使用的特定聚合物的分子结构的固有或记忆特性,强度以及模量或刚度随时间变化。

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