泡沫铝夹芯拱塑性动力响应的实验研究

摘要

应用泡沫金属弹撞击加载的方式研究了固支泡沫铝夹芯拱的塑性动力行为.对夹芯拱的变形与失效模式进行了系统的分类和分析,并考察了发射弹的动量、面板厚度、泡沫芯层厚度及曲率半径对其抗撞击性能的影响.夹芯拱的变形与失效模式可分为3种形式:前面板在作用区域的压入失效和整体的大变形、芯层的压缩失效和剪切失效以及后面板的非线性大变形.研究表明:通过增加面板厚度、芯层厚度或适当增大曲率等措施均能有效控制后面板的挠度,改善多孔金属夹芯拱的抗撞击性.实验结果对多孔金属夹芯结构的优化设计具有一定的参考价值.%The dynamic response of clamped sandwich arch with aluminum foam core under the impact loading of aluminum foam projectile was investigated. The deformation/failure modes of sandwich arch were classified and analyzed systematically. The effects of projectile momentum, face-sheet thickness,thickness of foam core, and radius of curvature on the structural response were analyzed. The deformation/failure modes of sandwich arch can be classified as the indenting failure in the loading area and the large global deformation of the front face sheet, the compression failure and shear failure of the core, and the large inelastic deformation of the back face sheet. The results show that the thicknesses of face sheets and core or the appropriate curvature can be increased effectively to control the permanent deflection of back face sheet, and improve the shock resistance of sandwich arch. The experimental results can provide a reference to the optimum design of cellular metallic sandwich structures.