摘要
基于核反应堆结构的破前漏（ＬＢＢ）分析，采用损伤力学方法，研究了压力管道和容器中表面裂纹在循环载荷作用下的疲劳扩展问题，得到了表面裂纹在不同的初始形状和载荷条件下扩展、贯穿和形状演化的一些基本规律。研究结果表明，对于一个小尺寸的表面裂纹，当它刚好扩展成为贯穿壁面的裂纹时，壁厚与该贯穿裂纹的长度之比总是在一定范围内。这对于部件的ＬＢＢ分析是很有意义的。
Based on the leakbeforebreak (LBB) analysis of structures in nuclear reactors, the fatigue growth problem of semielliptical surface cracks of pressurized pipes and vessels subjected to cyclic loading is studied by means of the damage mechanics methods. Some essential features of propagation, penetration and shape development of surface cracks under different initial aspect ratios and loading conditions are obtained. The results show that when a small surface crack propagates just into a throughwall crack, the ratio of the wall thickness to the length of the throughwall crack is always in a certain range. This is important for a component in its LBB analysis.
出处
《清华大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
1998年第7期35-38,85,共5页
Journal of Tsinghua University(Science and Technology)
基金
国家"八六三"高科技项目
关键词
压力管道
压力容器
表面裂纹
疲劳裂纹扩展
pressurized pipes and vessels
leakbefore break
surface crack
fatigue growth of crack
damage
