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首页> 外文期刊>Shock and vibration >Shock Wave Attenuation Characteristics of Aluminum Foam Sandwich Panels Subjected to Blast Loading
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Shock Wave Attenuation Characteristics of Aluminum Foam Sandwich Panels Subjected to Blast Loading

机译：爆炸载荷作用下铝泡沫夹芯板的冲击波衰减特性

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Comparative experiments were conducted with two different structures to study the mechanism of aluminum foam sandwich attenuating blast shock wave. The sandwich structure is composed of “steel–aluminum foam–steel,” and the mild steel structure is composed of “steel–steel.” In the experiment, the polyvinylidene fluoride transducers were used to directly test the load of stress wave between different interfaces of sandwich and mild steel structures. The strain of back sheet was simultaneously measured using high-precision strain gauge. The accuracy of the test results was verified by Henrych’s formula. Experimental results show that the wave attenuation rate on the mild steel structure is only 11.3%, whereas the wave attenuation rate on the sandwich structure can exceed 90%. The interface effect is clearly a more crucial factor in the wave attenuation. The peak value of back sheet strain in the mild steel structure is much higher than the sandwich structure. The apparent overall “X” crushing band is produced in the aluminum foam core, and scanning electron microscope (SEM) observation clearly shows the collapse of the cell wall. Experiments on the sandwich structure with different aluminum foam densities indicate that increasing the relative density results in increased attenuation capability of the aluminum foam and decreased attenuation capability of the sandwich structure. Experiments on the sandwich structure with different aluminum foam thickness indicate that increasing the thickness results in increased attenuation capability of the aluminum foam and the sandwich structure.
机译：对两种不同的结构进行了对比实验，以研究泡沫铝夹芯板衰减冲击波的机理。三明治结构由“钢-泡沫铝-钢”组成，低碳钢结构由“钢-钢”组成。在实验中，使用聚偏二氟乙烯换能器直接测试夹心结构和低碳钢结构不同界面之间的应力波载荷。使用高精度应变仪同时测量背板的应变。测试结果的准确性已通过Henrych的公式进行了验证。实验结果表明，低碳钢结构的波衰减率仅为11.3％，而夹层结构的波衰减率可以超过90％。界面效应显然是波衰减中更关键的因素。低碳钢结构中背板应变的峰值远高于夹心结构。在泡沫铝芯中产生了明显的整体“ X”形破碎带，而扫描电子显微镜（SEM）的观察清楚地显示了细胞壁的塌陷。在具有不同铝泡沫密度的夹层结构上进行的实验表明，增加相对密度会导致铝泡沫的衰减能力增强，而夹层结构的衰减能力会下降。在具有不同泡沫铝厚度的夹层结构上进行的实验表明，增加厚度会导致泡沫铝和夹层结构的衰减能力增强。

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