基于三种强度准则的PBX Ⅰ型裂纹尖端失效区研究  

Failure Zone of PBX Mode Ⅰ Crack Tip Based on Three Strength Criteria

作　　者：董天宝[1] 唐维[1] 温茂萍[1] 张巍耀[1] 韦兴文[1] 

机构地区：[1]中国工程物理研究院化工材料研究所,四川绵阳621999

出　　处：《含能材料》2017年第2期113-117,共5页Chinese Journal of Energetic Materials

基　　金：中物院化工材料研究所创新基金(2015KJCX09)

摘　　要：为了描述高聚物粘结炸药(PBX)裂纹尖端失效区域,采用Mohr-Coulomb、Twin-shear和Drucker-Prager强度准则,对PBXⅠ型裂纹尖端失效区进行研究,得到了描述PBX拉压不对称的裂纹尖端失效区表达式。研究表明,Drucker-Prager强度准则综合考虑了材料拉压比、平均应力及偏应力等因素,求解的裂纹尖端失效区相对最大。材料拉压比对裂纹尖端失效区有着显著影响,拉压比越小,材料拉压不对称越严重,裂纹尖端失效区越大。温度对PBX材料综合力学性能影响很大,60℃下裂纹尖端失效区较20℃下显著增大。To describe the crack tip failure zone of polymer bonded explosive（ PBX）,modeⅠ crack tip failure zone of PBX were studied based on the Mohr-Coulomb,Twin-shear and Drucker-Prager strength criterion. The expressions describing the crack tip failure zone of the tension-compression asymmetry for PBX were obtained. Results show that the Drucker-Prager strength criterion takes into account the factors such as tension-compression strength ratio,average stress and deviatoric stress,the solving crack tip failure zone is the biggest. The tensioncompression ratio of the material has a significant effect on the crack tip failure zone,the smaller the tension-compression ratio,the more serious the tension-compression asymmetry of materialis,the greater the crack tip failure zone. The temperature has great influence on the mechanical properties of PBX materials,and the crack tip failure zone at 60 ℃ is significantly larger than that at 20 ℃.

关 键 词：高聚物粘结炸药(PBX) 裂纹尖端失效区 强度准则 

分 类 号：TQ560.1[化学工程—炸药化工]