摘要
为研究围压环境下复合推进剂断裂力学性能,开展了复合推进剂在不同围压(相对大气压0~6.5 MPa)和拉伸速率(100~7500 mm/min)条件下的单轴抗拉强度试验和I型裂纹断裂试验,获取了不同条件下复合推进剂应力—应变响应曲线和断裂力学特性曲线;分析了围压和拉伸速率对最大抗拉强度、最大断裂载荷、最大断裂位移、I型临界应力强度因子(K_(IC))和临界J积分(J_(IC))的影响;基于时间—压强等效原理,建立了I型临界应力强度因子(K_(IC))主曲线。结果表明,复合推进剂的最大抗拉强度、最大断裂载荷和K_(IC)随围压和拉伸速率的增加而增加;不同拉伸速率下的最大断裂位移随着围压的增加而增加;J_(IC)随围压变化较为复杂,低拉伸速率条件下,J_(IC)随着围压的增加而增加,而在高拉伸速率条件下(7500 mm/min),J_(IC)随着围压变化较小;K_(IC)主曲线较大地拓宽了对复合推进剂断裂性能的预测范围,可为点火增压载荷下复合推进剂装药结构断裂评估奠定基础。
In order to investigate the fracture properties of composite solid propellant(CSP)under confining pressure,uniaxial tensile tests and type I crack fracture tests were conducted under different confining pressures(relative atmospheric pressure 0—6.5 MPa)and tensile rates(100—7500 mm/min).The stress—strain response curves and fracture mechanical response curves of CSP under various experimental conditions were obtained.The influences of confining pressure and tensile rate on the maximum tensile strength,the maximum fracture load,the maximum fracture displacement,mode I critical stress intensity factor(K_(IC))and critical J integral(J_(IC))of CSP were analyzed.The results indicate that the maximum tensile strength,the maximum fracture load and K_(IC)increase with an increase in the confining pressure and tensile rate.Under various tensile rates,the maximum fracture displacement increases with the increase in confining pressure.The variation of J_(IC)with confining pressures is complicated.Under low tensile rate conditions,the J_(IC)increases with the increase of confining pressure.Under high tensile rate conditions(7500 mm/min),the J_(IC)changes less with the increase of confining pressure.Based on the time-pressure superposition principle,the master curve of K_(IC)was established,which greatly broadens the prediction range of the fracture property of the CSP,which can lay a foundation for the fracture evaluation of the CSP charge under ignition pressurized load.
作者
李辉
许进升
靳凡
李潘
王天忠
范志庚
LI Hui;XU Jin-sheng;JIN Fan;LI Pan;WANG Tian-zhong;FAN Zhi-geng(Institute of Systems Engineering,China Academy of Engineering Physics,Mianyang Sichuan 621999,China;School of Mechanical Engineering,Key Laboratory of Special Engine Technology,Ministry of Education,Nanjing University of Science and Technology,Nanjing 210094,China;Shock and Vibration of Engineering Materials and Structures Key Laboratory of Sichuan Province,China Academy of Engineering Physics,Mianyang Sichuan 621999,China)
出处
《火炸药学报》
北大核心
2025年第8期706-714,I0001,共10页
Chinese Journal of Explosives & Propellants
关键词
材料力学
复合固体推进剂
围压
拉伸速率
断裂性能
material mechanics
composite solid propellant
confining pressure
tension rate
fracture properties
