研究了高聚物粘结炸药在室温下的断裂特性 ,结果表明这类材料的断裂韧性与裂纹长度有关 ,所测试的断裂韧性值随着裂纹长度的增加而降低 ,并且不趋于一个较稳定的值 ,这与金属材料的结果不一样。断面观察发现断面上有分布的颗粒 ,且周围与基体界面的微裂纹使得材料的断裂性能降低。分析表明 ,对工程应用来讲 ,可以选取 0 .2≤a/W≤ 0 .3范围内的裂纹长度来确定这类材料的断裂韧性。 The fracture characteristics of polymer bonded explosives at room temperature were studied. The results show that the fracture toughness of these materials is related to the crack length. The fracture toughness values ​​tested decrease with the increase of crack length and do not tend to be more stable The value, which is not the same as the result of the metal material. Cross-sectional observation found that the distribution of particles on the cross-section, and the micro-cracks around the interface with the substrate so that the fracture properties of materials decreased. The analysis shows that for engineering applications, the crack length in the range of 0.2≤a / W≤0.3 can be selected to determine the fracture toughness of such materials.