Present study investigates the effect of pinned and fixed boundary conditions on deformation characteristics of silicone rubber pin‐reinforced polymer sandwich composite under rigid plate impact. These boundary conditions represent two different structural applications of the sandwich which consists of a soft polyurethane foam core, embedded with four silicone pins for reinforcement, placed in between two hard acrylic faceplates. Compression test were conducted on foam at different strain rates and the results obtained for quasi‐static case was later used in numerical analysis for procedure validation and impact simulation using finite element analysis software ABAQUS. Results for deformation, contact force generated and stresses induced are obtained. Quasi‐static compression results show good conformity between experimental and numerical results for foam. Impact results show that both boundary conditions have negligible effect on deformation and contact force but pinned condition produces much higher stresses than fixed one. The study also found that pin‐reinforcement significantly affects the impact behavior and the post‐impact recovery.

中文翻译：

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边界支撑条件对有机硅钉增强聚合物夹芯复合结构冲击性能的影响

本研究调查了固定边界条件和固定边界条件对刚性板冲击下硅橡胶钉增强聚合物夹芯复合材料变形特性的影响。这些边界条件代表了三明治的两种不同的结构应用，该三明治由一个软质聚氨酯泡沫塑料芯构成，嵌有四个用于加固的硅树脂销钉，置于两个硬质丙烯酸面板之间。在不同应变速率下对泡沫进行压缩测试，然后将准静态情况下获得的结果用于数值分析中，以使用有限元分析软件ABAQUS进行程序验证和冲击模拟。获得变形，产生的接触力和产生的应力的结果。准静态压缩结果表明泡沫的实验结果与数值结果具有良好的一致性。冲击结果表明，两种边界条件对变形和接触力的影响都可以忽略不计，但钉扎条件产生的应力要比固定条件高得多。研究还发现，加固销钉会显着影响冲击行为和冲击后恢复。