圆周非贯穿裂纹管局部柔度的理论和试验研究  

THEORETICAL AND EXPERIMENTAL STUDY ON LOCAL FLEXIBILITY OF PIPE WITH A PART-THROUGH CIRCUMFERENTIAL CRACK

作　　者：胡家顺[1] 冯新[1] 周晶[1] 

机构地区：[1]大连理工大学海岸和近海工程国家重点试验室,辽宁大连116024

出　　处：《工程力学》2010年第4期37-43,共7页Engineering Mechanics

基　　金：国家自然科学基金重点项目(50439010);863计划专题课题项目(2008AA09Z308)

摘　　要：圆周非贯穿裂纹是管类结构裂纹发展的典型形式,是引起管道断裂的主要因素之一。首先,从线性断裂力学理论出发,推导了管类结构中由圆周非贯穿裂纹引入的局部柔度系数方程,利用适应性的Simpson数值积分方法计算得到相应的局部柔度系数。其次,进行了圆周非贯穿裂纹管的动力模型试验,通过理论值与试验值对比分析验证了局部柔度系数求解方法的有效性。研究结果表明:根据局部柔度系数求解得到的裂纹管模型频率值与试验值基本吻合,从而验证了圆周非贯穿裂纹管局部柔度系数推导和求解的合理性。The part-through circumferential crack is a typical crack form in pipe structure, and is also one of the main causes of pipe rupture. Firstly, this paper derived the local flexibility equations of pipe with a part-through circumferential crack using linear fracture mechanics. Then, an adaptive Simpson quadrature-revisted was used to perform the numerical integration to obtain the flexibility coefficients. Finally, the dynamic testing results of the part-through circumferentially cracked pipe were used to validate the proposed resolution for local flexibility. It is found that the natural frequencies of cracked pipe by means of the proposed local flexibility and dynamic test show good agreement, which indicates that the proposed flexibility equations and the presented solutions for calculating local flexibility are reasonable.

关 键 词：断裂力学 振动分析 裂纹 管 局部柔度 模型试验 

分 类 号：O346.1[理学—固体力学] TV32[理学—力学]