冷压成型活性材料准静态压缩特性

Quasi-Static Compression Properties of Cold Isostatically Pressed Reactive Materials

采用准静态压缩实验的方法,对冷压成型PTFE/Al/W活性材料的力学特性进行了研究.基于准静态应力-应变曲线分析,得到了活性材料密度对抗压强度和杨氏模量的影响规律.结果表明,随着活性材料密度的提高,抗压强度和杨氏模量呈逐渐增大趋势,材料失效裂纹与轴线基本呈30°~45°角.进一步对准静态压缩前、后活性材料试样细观结构电镜扫描分析发现,在一定密度范围内,随着基体材料含量的减少和活性材料密度的提高,准静态压缩载荷作用下材料内部形成的力链数量随之增加,从而导致活性材料抗压强度和杨氏模量的增大.

Quasi-static compression experiments were performed on cylindrical specimens of cold isostatically pressed PTFE/Al/W reactive materials to study its mechanical response behavior and properties. The influences of density on Young modulus values of reactive materials were obtained by analyzing the quasi-static stress-strain curve at elastic deformation stage. The experimental results show that the ultimate compression strength and Young modulus of cold pressed PTFE/Al/W reactive materials present an increasing trend with the increase of reactive material density, and the cracks produced by quasi-static loads form in a range of angles from 30° to 45°. In addition, based on typical scanning electron microscope images of the uncompressed and compressed specimens with different density, it is showed that the number of force chains increases with an increasing reactive materials density, resulting in the increase of ultimate compression strength and Young modulus of reactive materials.