金属泡沫复合材料夹芯结构的压痕响应实验

金属泡沫夹芯结构是近年来新出现的一种明显具有结构和功能一体化特点的新型轻质材料,它在临近空间飞行器、航海及汽车等领域有着广阔的应用前景。以以纤维增强复合材料面板、闭孔泡沫铝芯子为特征的复合材料夹芯结构为研究对象,对其在球形压头作用下的压痕响应、损伤模式、变形机制和失效机理进行理论分析和实验研究。研究发现,泡沫铝复合材料夹芯结构的压痕响应是夹芯结构的各个组成部分的响应、相互作用以及压头属性的综合作用结果。泡沫铝复合材料夹芯结构在球压头作用下的损伤模式为基体开裂、纤维断裂、层间分层、泡沫铝的屈服及剪切断裂五种失效模式。

Experimental study of the indentation of composite sandwich structure with metal foam core

Sandwich structure with metal foam core is a new emerged sandwich structure in recent years, and will be widely used in near space flight vehicle, aviation and marine fields due to due to its high flexural rigidity and strength, multifunction. This paper presents experimental studies on the quasi-static indentation, damage modes and failure mechanisms of a rigid spherical-end indenter into composite sandwich panels with glass fibre-reinforced polymer face and Al foam core. It was found that the load-indentation response is a consequence of the individual responses of the sandwich components, their structural interactions and the indenter properties. The failure models of sandwich panel under the spherical-end cylindrical indenter can be summarized as matrix cracking, fiber fracture, face/core debonding, the yield and shear of aluminum foam.