Proceedings of the KSME Conference (대한기계학회:학술대회논문집)
- 2000.04a
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- Pages.1-6
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- 2000
A Study on the Fracture Behavior of a Crack in Gas Pipelines Considering Constraint Effects
구속효과를 고려한 가스배관 결함의 파괴거동해석
- Published : 2000.04.20
Abstract
FFP(Fitness For Purpose) type defect assessment methodologies based on ECA(Engineering Critical Analysis) have been established and are in use for the structural integrity evaluation of gas pipelines. ECA usually includes the fracture mechanics analysis, and it assumes that J-integral uniquely characterizes crack-tip stress-strain fields. However, it has been shown that it is not sufficient to characterize the crack-tip field under low levels of constraint with a single parameter. Since pipeline structures are made of ductile material, locally loaded in tension, cracks may experience low level of constraint, and therefore, J-dominance will be lost. For this reason, the level of constraint must be quantified to establish a precise assessment procedure for pipeline defects. The objective of this paper is to Investigate the fracture behavior of a crack in gas pipeline by quantifying the level of constraint. For this purpose, tensile tests and CTOD tests were performed at room temperature
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