复杂载荷下含缺陷管道的极限载荷及L_r参量  

Plastic Limit Load and Graphic Evaluation of L _r for Cracked Piping Under Multiple Loads

作　　者：郭茶秀[1] 魏新利[1] 王定标[1] 刘宏[1] 

机构地区：[1]郑州大学化工学院,河南郑州450002

出　　处：《郑州大学学报（工学版）》2004年第1期49-52,93,共5页Journal of Zhengzhou University（Engineering Science）

基　　金：国家"十五"科技攻关项目(2001BA803B03-05);河南省高校青年骨干教师基金资助项目

摘　　要：基于净截面垮塌准则(NSC)和Von-Mises屈服准则,推导了空间含缺陷管道在拉伸、弯曲、扭矩和内压多种载荷共同作用下的塑性极限载荷方程.另外还给出了在三维应力状态下的含缺陷结构Lr参量的新定义,针对多载荷作用下的周向裂纹管提出了求解Lr参量的联立方程法、幂指数法.补充和完善了现有规范,对含缺陷结构的失效评定工作具有重要的意义.The plastic limit load solutions of the circumferentially cracked piping, under various combined loads of tension force, bending moment, torsion moment and internal pressure are derived based on NSC method and Von-Mises yield criterion.A new definition of L _r parameter for considering the three dimensional stress distribution caused by hoop stress and torsion shear stress is made and the L _r solutions of these structures under various multiple loads are developed in the form of the simultaneous equations and a single exponential function equation.The work in this paper complements the codes and has significance for the safety assessment of structure caontaining defects.

关 键 词：塑性极限载荷 裂纹管 Lr参量 含缺陷管道 管线 

分 类 号：U178[交通运输工程]