实际结构拘束相关断裂韧性的确定方法研究  

STUDY ON THE DETERMINATION METHOD OF CONSTRAINT DEPENDENT FRACTURE TOUGHNESS OF STRUCTURE

作　　者：杨杰[1] 王雷 

机构地区：[1]上海理工大学能源与动力工程学院化工过程机械研究所,上海200093

出　　处：《机械强度》2017年第6期1438-1444,共7页Journal of Mechanical Strength

基　　金：国家自然科学基金(51605292);上海市自然科学基金(15ZR1429000);上海高校青年教师培养资助计划(ZZslg15013)资助~~

摘　　要：材料的断裂韧性受裂尖拘束的影响,为了对含裂纹结构进行准确的完整性评定,需要计算拘束相关的断裂韧性。基于统一拘束参数Ap及其与断裂韧性的统一关联,提出了一种实际结构拘束相关断裂韧性的确定方法。并以核电站主管道为例,对不同长度、不同深度3D裂纹的断裂韧性与起裂弯矩进行了计算。计算结果表明:管道裂纹的断裂韧性和起裂弯矩与裂尖拘束密切相关,a/t=0.5,a/c=0.5~0.6形状尺寸的裂纹更容易发生断裂。此研究对于发展纳入拘束效应的结构完整性评定技术和方法、提高结构可靠性等方面具有重要的意义。The fracture toughness of material are affected by the constraint at crack tip. In order to assess the structural integrity of cracked structure accurately,it needs to obtain the constraint dependent fracture toughness. In this paper,based on the unified constraint parameter Apand the unified correlation line with fracture toughness,a determination method of constraint dependent fracture toughness of structure is proposed. Furthermore,the constraint dependent fracture toughness and fracture bending moment of pipeline with different crack lengths and depths are calculated. The results show that the fracture toughness and fracture bending moment are depending on the crack tip constraint closely,the crack with a/t = 0. 5 and a/c = 0. 5 - 0. 6 will fracture easily. This study is with great significance of developing structural integrity assessment which incorporates constraint effect,increasing the reliability of structure,and so on.

关 键 词：拘束 断裂韧性 管道 结构完整性 

分 类 号：TH114[机械工程—机械设计及理论] O346.1[理学—固体力学]