Meso-level manufacturing process simulation of sandwich structures to analyze viscoelastic-dependent residual stresses
Meso-level manufacturing process simulation of sandwich structures to analyze viscoelastic-dependent residual stresses
复制标题
夹层结构的细观制造过程模拟，用于分析粘弹性相关的残余应力
DOI：
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发表时间：
2012
期刊：
影响因子：
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通讯作者：
A. Herrmann
中科院分区：
文献类型：
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作者：
C. Brauner;T. B. Block;A. Herrmann
本文提出了一种分析销钉增强夹层结构(碳纤维增强塑料/泡沫)细观单胞工艺应力的模拟方法。在制造过程中，不同的机制会导致工艺引起的变形和应力。这些机制取决于热膨胀、收缩、材料的非线性粘弹性和局部温度的变化。在严重的情况下，这些残余应力可能会导致材料的初始退化甚至失效。本文介绍了一种对制造过程进行顺序耦合热力分析的方法，重点是正确确定应力和描述粘弹性松弛效应。提出了一种考虑特征松弛时间随固化过程变化的各向异性的新方法。
This article presents a simulation method to analyze process-induced stresses of a meso-level unit cell of a pin-reinforced sandwich structure (carbon fiber-reinforced plastics/foam). During the manufacturing process, different mechanisms lead to process-induced deformations and stresses. These mechanisms depend on thermal expansion, shrinkage, nonlinear viscoelastic properties of the material, and variation in local temperatures. In critical cases, these residual stresses can lead to initial degradation and up to failure of the material. This article demonstrates a method to perform a sequential coupled thermo-mechanical analysis of the manufacturing process with focus on the correct determination of stresses and description of the viscoelastic relaxation effect. A novel approach to take into account anisotropy of characteristic relaxation times dependent on the cure process is presented.