近几年来对材料断裂问题的研究,趋向于将宏观力学性能与微观组织结构结合起来进行。应用扫描电子显微镜进行断口分析是使两者结合起来进行研究的有效手段。在高分子材料的断口上,一般可划分为起裂区、裂纹扩展区和瞬时断裂区三个区域。本文着重论述了聚碳酸酯和聚丙烯材料在瞬时断裂区上的材料抵抗破断的阻抗形态。 In recent years, the research on the fracture of materials tends to combine macroscopic mechanical properties with microstructure. The use of scanning electron microscopy for fracture analysis is to combine the two to study an effective means. Fracture in the polymer material, the general can be divided into the initiation zone, crack expansion zone and instantaneous rupture zone three areas. This article focuses on the impedance morphology of materials that resist breaking of the polycarbonate and polypropylene material in the instantaneous fracture zone.