薄壁压力容器Ⅰ-Ⅱ型复合裂纹的塑性区研究  

STUDY ON PLASTIC ZONE OF Ⅰ- Ⅱ MIXED MODE CRACK OF THIN-WALLED PRESSURE VESSURE

作　　者：李杜娟[1,2] 李晓红[1] 王可可[3] 

机构地区：[1]西安石油大学机械工程学院,陕西西安710065 [2]陕西省石油化工学校机械工程系,陕西西安710061 [3]中国石化第五建设公司,广东广州215095

出　　处：《南阳理工学院学报》2013年第6期81-83,共3页Journal of Nanyang Institute of Technology

摘　　要：裂纹尖端塑性区对裂纹的扩展和失稳扩展起着关键作用。此文针对薄壁压力容器结构中可能出现的Ⅰ-Ⅱ型复合裂纹,利用Mises屈服条件对裂纹尖端塑性区的分布进行了研究,推导出两向拉伸斜裂纹尖端塑性区分布的数学表达式。用线弹性断裂理论推导了裂纹开裂角度与裂纹角的关系,并用数学软件Matlab描述了在临界状态下不同裂纹角所对应的裂纹尖端塑性区的轮廓线。The crack tip plastic zone plays an important role in stable or unstable growing of crack. In this paper, the distribution of crack tip plastic zone was studied by utilized of Mises yield condition that directed at the thin-walled pressure vessel structure with I - lI mixed mode crack, and mathematical formula about distribution of two-dimension stress of the oblique crack tip plastic zone were inferred, and the relationship between the crack initiation angles and crack angle was deduced by linear elastic fracture theory. The outline of the crack tip plastic zone to different crack angles in the critical state was described by using of mathematical software Matlab.

关 键 词：Ⅰ-Ⅱ复合裂纹 两向应力 塑性区 开裂角 

分 类 号：O346.1[理学—固体力学]