摘要
开展了硝酸酯增塑聚醚(Nitrate Ester Plasticized Polyether,NEPE)推进剂在100 mm/min拉伸速率下的单边缺口张力实验,研究了NEPE推进剂裂纹扩展过程中的力学响应、裂纹形态和演化路径。基于键型近场动力学理论,模拟了NEPE推进剂的裂纹扩展失效过程,计算了断裂韧性临界应力强度因子,并提出了与应力强度因子相关的考虑推进剂燃速的断裂准则。实验结果表明:NEPE推进剂在裂纹扩展过程中会出现钝化断裂现象;宏观裂纹扩展发生之前,推进剂内部就已出现损伤。键型近场动力学方法可以准确模拟NEPE推进剂的裂纹扩展过程、计算应力强度因子并可视化推进剂内部的损伤情况,说明近场动力学方法能够为NEPE推进剂断裂过程的数值模拟提供新的方法。
The mechanical response,crack morphology and evolutionary path of NEPE propellant during the crack propagation are investigated through single-edge notched tension(SENT)experiment at a tensile rate of 100 mm/min.Based on the bond-based peridynamic(BBPD)theory,the failure process of crack propagation in NEPE propellant is simulated,the critical stress intensity factor of fracture toughness is calculated,and a fracture criterion considering the burning rate of the propellant is proposed.Experimental results show that a blunting fracture occurs in NEPE propellant during crack propagation.Prior to macroscopic crack propagation,an internal damage takes place in the propellant.The BBPD method can accurately simulate the crack propagation process of NEPE propellant,compute the stress intensity factor,and visualize the internal damage.This suggests that the peridynamic technique provides a new approach to simulate the fracture process of NEPE propellant.
作者
刘瀚文
付小龙
王江宁
孟赛钦
LIU Hanwen;FU Xiaolong;WANG Jiangning;MENG Saiqin(Xi'an Modern Chemistry Research Institute,Xi'an 710065,Shaanxi,China)
出处
《兵工学报》
北大核心
2025年第7期162-169,共8页
Acta Armamentarii
基金
国家自然科学基金项目(22205177)。
