Net-section limit moments for circumferential cracks at the interface between elbows and pipes
Closed-form net-section limit moment solutions are given for circumferential through-wall and part- through surface cracks at the interface between elbows and attached straight pipes under in-plane bending, via systematic, small strain FE limit analyses using elastic-perfectly plastic materials. Net-section limit moments for circumferential cracks at the interface between elbows and attached straight pipes are found to be close to those for cracks in the centre of elbows, implying that the location of the circumferential crack within an elbow does not affect net-section limit moment. Moreover, when a crack in welds between an elbow and attached straight pipe is assessed, the assumption that the crack locates in a straight pipe could significantly overestimate a net-section limit load (and thus maximum load-carrying capacity) of the cracked component, and thus could be non-conservative. For conservative assessment, a crack should be assumed to locate in the centre of an elbow, rather than in a straight pipe.
Circumferential crack Elbow Finite element limit analysis In-plane bending Net-section limit load
Chang-Kyun Oh Tae-Kwang Song Yun-Jae Kim Jong-Sung Kim Tae-Eun Jin
Department of Mechanical Engineering, Korea University, 5 Ka, Anam-dong, Sungbuk-Ku, Seoul 136-701, Structural Integrity & Materials Department, Korea Power Engineering Company, Yongin-si, Gyeonggi-do
国际会议
国际断裂力学2007年会(Fracture Mechanics and Applications 2007)
长沙
英文
141-152
2007-11-01（万方平台首次上网日期，不代表论文的发表时间）