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The effect of temperature on the failure modes of polymer foam cored sandwich structures

机译：温度对聚合物泡沫芯夹芯结构破坏模式的影响

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The influence of elevated temperature on the stability of sandwich structures is investigated. A new analytical solution is proposed that enables the calculation of the critical wrinkling stress in sandwich beams subjected to load and elevated temperatures. The effect of a through thickness temperature gradient is accounted for by imposing different stiffnesses of the core for the different temperatures. The sandwich beam studied in the paper is loaded in a simply supported four-point bending configuration, where one of the face sheets is heated. The experimental approach utilises high-speed imaging where the strains are calculated from measured displacements obtained from digital image correlation (DIC). A shift of the failure mode from face sheet yielding to face sheet wrinkling is observed with increasing temperatures. The results from the new analytical method agree well with corresponding experimental results. Finite element analysis is also conducted, which shows excellent correspondence with the theory and the experimental data. The work clearly demonstrates that under certain conditions the load response of the sandwich beam can become nonlinear and unstable, and hence will fail well below face sheet yielding load because of the loss of stiffness of the core material. (C) 2014 Elsevier Ltd. All rights reserved.
机译：研究了高温对夹心结构稳定性的影响。提出了一种新的分析解决方案，该解决方案能够计算承受载荷和高温的夹层梁的临界起皱应力。贯穿厚度温度梯度的影响是通过对不同温度施加型芯的不同刚度来解决的。本文研究的夹层梁以简单支撑的四点弯曲结构加载，其中一个面板被加热。实验方法利用高速成像，其中应变是根据从数字图像相关性（DIC）获得的测量位移来计算的。随着温度升高，观察到破坏模式从面板屈服转变为面板起皱。新的分析方法得到的结果与相应的实验结果非常吻合。还进行了有限元分析，这与理论和实验数据具有很好的对应性。这项工作清楚地表明，在某些条件下，夹层梁的载荷响应会变得非线性和不稳定，因此会由于芯材材料的刚度损失而在面板屈服载荷以下失效。 （C）2014 Elsevier Ltd.保留所有权利。

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