Effectiveness study of the envelope method for coalescing multiple surface cracks

摘要：

In this paper, the envelope method tor covering multiple coplanar surface cracks used in ASME and GB/T19624 for the safety assessment of equipment with cracks is addressed. Strain energy density factors at the crack front are calculated using finite element method. Crack propagation direction is investigated by comparing the strain energy density factors at different points on the crack front. It is found that if the elliptical surface crack is flat, the crack would preferably propagate along depth direction. In this case, the finally coalesced crack is much larger in size and the envelope method is not appropriate.

关键词： Multiple cracks Strain energy density factors Crack coalescence

作者: Xiaoyu Liu Caifu Qian Huifang Li Hui Zheng

作者单位: Beijing University of Chemical Technology, Beijing 100029, China Chizhou Special Equipment Inspectio Beijing University of Chemical Technology, Beijing 100029, China China Special Equipment Inspection and Research Center, Beijing 100013, China

会议类型: 国际会议

会议名称: 2011 International Symposium on Structural Integrity 2011国际结构完整性学术研讨会--核工程结构完整性技术 ISSI 2011

会议地点: 合肥

会议语种:英文

页码: 367-370

在线出版日期: 2011-10-27（万方平台首次上网日期，不代表论文的发表时间）