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Temperature and Rate Sensitivity of Polymer Foam Cores

机译:聚合物泡沫芯的温度和速率敏感性

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In this study, cross-linked poly-vinyl chloride (PVC) closed-cell foams were examined under quasi-static and high strain rate compression loading using a servo-hydraulic testing machine and a modified Split Hopkinson Pressure Bar (SHPB) apparatus consisting of polycarbonate bars for strain rates up to 1400 s~(-1). Three foam densities were examined viz. 75, 130, and 300 kg/m~3. Each core density has been subjected to various strain rates at both room and elevated temperatures. The stress-strain behavior was evaluated. A post impact study was also performed to evaluate the failure modes of the foam cores. When moving from room to elevated temperatures at high strain loading a reverse trend in failure modes was observed, which was not found in quasi-static testing at elevated temperatures.
机译:在该研究中,使用伺服液压试验机和由改进的分裂霍普金森压力棒(SHPB)装置在准静态和高应变速率压缩负载下检查交联聚氯乙烯(PVC)闭合细胞泡沫。由用于应变率的聚碳酸酯棒,高达1400 s〜(-1)。检查了三种泡沫密度。 75,130和300kg / m〜3。每个核心密度在两个房间的各种应变速率经受升高的温度。评估应力 - 应变行为。还进行了职位影响研究以评估泡沫核心的失效模式。当从高菌株加载高菌株的高度温度移动时,观察到失效模式的反向趋势,在升高的温度下在准静态测试中未发现。

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