基于权函数法的管道环向外表面三维裂纹应力强度因子计算  

Stress intensity factor calculation of three-dimensional external surface circumferential cracks on pipeline by weight function method

作　　者：况正 唐毅 陈银强 KUANG Zheng;TANG Yi;CHEN Yinqiang(China Nuclear Power Operation Technology Co.,Ltd.,Wuhan 430223,China;Key Laboratory of In-service Inspection and Evaluation of China Nuclear Power,Wuhan 430223,China)

机构地区：[1]中核武汉核电运行技术股份有限公司,武汉430223 [2]中核核动力在役检查及评定重点实验室,武汉430223

出　　处：《压力容器》2023年第3期47-55,共9页Pressure Vessel Technology

摘　　要：利用通用三维权函数形式,结合有限元计算,得到了径厚比t/R_(i)=1/20,1/10,1/5的直管环向外表面半椭圆裂纹最深点和表面点的权函数。通过对比高阶载荷下权函数与有限元方法应力强度因子影响系数计算结果,验证权函数的有效性。对于裂纹最深点,权函数与有限元结果误差最大值为1.3%。基于得到的权函数,计算受内压直管外表面半椭圆裂纹的应力强度因子,并与RSE-M标准规范计算结果对比,最深点和表面点的计算误差最大值分别为8.33%和11.86%,说明利用权函数方法可以较好地预测直管环向外表面裂纹的应力强度因子。Using the general three-dimensional weight function form and in combination with finite element method,the weight functions of the deepest point and surface point of the circumferential semi-elliptical crack on the external surface were obtained for straight pipes with diameter-thickness ratio t/R_(i)=1/20,1/10 and 1/5.The validity of the weight function was verified by comparing the influence coefficient calculation results of stress intensity factors(SIFs)of the weight function with the FEM under higher order loads.For the deepest points,the maximum values of the error between the weight function and the FEM results was 1.3%.Based on the obtained weight functions,the SIFs of semi-elliptical cracks on the external surface of straight pipes subjected to internal pressure were calculated and compared with the calculated results of the RSE-M,and the maximum values of the calculation errors at the deepest and surface points were 8.33%and 11.86%,respectively,indicating that the weight functions can make good predication for the SIFs of circumferential semi-elliptical crack on the external surface of straight pipe.

关 键 词：管道 外表面裂纹 权函数法 应力强度因子 

分 类 号：TH49[机械工程—机械制造及自动化] TH123[理学—固体力学] O346.1[理学—力学]