多物理场作用下身管应力场及裂纹尖端强度因子分析  

Stress Field and Crack Tip Intensity Factor Analysis of Barrel Under Multi Physical Fields

作　　者：王为介 曲普[1] 李强[1] 李池 WANG Weijie;QU Pu;LI Qiang;LI Chi(School of Mechatronics Engineering, North University of China, Taiyuan 030051, China)

机构地区：[1]中北大学机电工程学院,太原030051

出　　处：《兵器装备工程学报》2020年第12期138-142,共5页Journal of Ordnance Equipment Engineering

基　　金：国防科技工业强基工程基础研究与前沿技术项目(JSZL2016208B006)。

摘　　要：采用扩展有限元法分析了残余应力场和温度场对自紧身管最高膛压部位裂纹尖端应力场及强度因子的影响。结果表明含裂纹体的身管在残余应力场影响下,裂纹尖端的应力为压应力,应力强度因子呈负值,能够抑制裂纹扩展,增强身管寿命。但随着温度的增加,裂纹内表面两端的应力强度因子值正向越来越大。Based on the extended finite element method,this paper analyzed the stress field and intensity factor of the crack tip when there is a crack at the highest bore pressure of the barrel.The influence of residual stress field on the stress field and intensity factor of the crack tip and the influence of different temperature fields on the stress field and intensity factor of the crack tip of the self tight tube were analyzed respectively.The analysis results show that the stress at the crack tip is compressive stress and the stress intensity factor is negative under the influence of residual stress field,which can inhibit the crack propagation and enhance the barrel life.However,with the increase of temperature,the stress intensity factors at both ends of the inner surface of the crack increase.

关 键 词：身管 扩展有限元法 裂纹尖端强度因子 残余应力场 温度场 裂纹尖端应力场 

分 类 号：TJ303[兵器科学与技术—火炮、自动武器与弹药工程]