固体推进剂药柱点火瞬态裂纹尖端场研究  

Study on the Crack-tip Fields of Solid Propellant Grains at the Ignition Transient

作　　者：龙兵 高双胜 金伟 LONG Bing;GAO Shuangsheng;JIN Wei(School of Aviation and Mechanical Engineering,Changzhou Institute of Technology,Jiangsu Changzhou 213032,China;No.96811 Unit,Zhejiang Jiangshan 324109,China)

机构地区：[1]常州工学院航空与机械工程学院,江苏常州213032 [2]96811部队,浙江江山324109

出　　处：《弹箭与制导学报》2021年第4期15-19,共5页Journal of Projectiles,Rockets,Missiles and Guidance

基　　金：江苏省高等学校自然科学研究面上项目(20KJB590001)资助。

摘　　要：采用线粘弹性模型,开展了药柱点火瞬态的动态裂纹尖端场仿真研究。结果表明,在裂尖及附近很小的区域内存在应力奇异性,且裂纹前端主要受拉应力的作用。裂尖应力应变随距裂尖距离r的增加而逐渐减小并趋于一定值;在θ处于0°~90°时,最大主应力和环向应变随θ的增大逐渐增大,而在θ处于90°~180°时则随着θ的增加而逐渐减小。在有限元计算结果的基础上得到了裂尖区域的张开型应力分布并计算了动态应力强度因子值,同文献中获得的推进剂动态断裂韧性结果进行比较,预测了裂纹的起裂危险性。Based on the linear viscoelastic model,dynamic crack-tip fields of propellantgrains structure contains precrack under the ignition pressurization conditions is studied by numerical method.Stress singularity is existence at the crack tip and a very small area near the crack tip,and the front end of the crack is mainly subjected by tensile stress.The crack tip stress strain gradually decreases with the increase of the distance r and tends to a constant value.Whenθis between 0°and 90°,the maximum principal stress and hoop strain increase with the angle increases,and whenθis between 90°and 180°,it gradually decreases as the angle increases.Based on the finite element calculation results,the open stress fields in crack-tip ahead are analyzed,and the dynamic stress intensity factors are obtained,and compared with the dynamic fracture experimental results,the fatalness of crack initiation is predicted.

关 键 词：药柱 动态 裂纹尖端场 点火瞬态 

分 类 号：V435[航空宇航科学与技术—航空宇航推进理论与工程]