Abstract

An elastic-plastic, viscoelastic damage model to accurately describe the crushing and energy absorption of polymer foams in sandwich panels was implemented in ABAQUS Explicit. Good agreement was found between ABAQUS predictions and experimental results with Divinycell H100 foams under triaxial compression, triaxial compression-tension and triaxial compression-shear. The elastic-plastic viscoelastic damage model was used to simulate the response of a doubly curved foam core composite sandwich shell subjected to direct pressure pulse and water pressure pulse loading. Results using the new crushable foam model were compared to those using the ABAQUS built-in isotropic crushable foam model. It was found that sandwich panels with the more commonly used, isotropic crushable foam model overestimated the stiffness, strength and energy dissipation of sandwich shells with Divinycell H100 foam cores. The proposed elastic-plastic-viscoelastic-damage model would provide more accurate results and offer better protection of composite sandwich structures than the isotropic crushable foam model.

摘要

在 ABAQUS Explicit 中实施了一个弹塑性、粘弹性损伤模型，用于准确描述夹层板中聚合物泡沫的破碎和能量吸收。ABAQUS 预测与 Divinycell H100 泡沫在三轴压缩、三轴压缩-拉伸和三轴压缩-剪切作用下的实验结果有很好的一致性。弹塑性粘弹性损伤模型用于模拟双曲面泡沫芯复合夹层壳在直接压力脉冲和水压脉冲载荷下的响应。使用新的可压碎泡沫模型的结果与使用 ABAQUS 内置各向同性可压碎泡沫模型的结果进行了比较。结果发现，具有更常用的各向同性可压碎泡沫模型的夹芯板高估了刚度，使用 Divinycell H100 泡沫芯的夹层壳的强度和能量耗散。与各向同性可压碎泡沫模型相比，所提出的弹塑性粘弹性损伤模型将提供更准确的结果并为复合夹层结构提供更好的保护。