Aerospace Knowledge and Technology Journal

Aerospace Knowledge and Technology Journal

Determination of mixed mode stress intensity factors for longitudinally seam weld pipes containing 3D semi elliptical cracks

Document Type : Research Paper

Authors
Mohammad Reza Mohammad Aliha
Seyed Mohammad Navid Ghoreishi
Hassan Farahbakhsh
Abstract
Longitudinally seam welded pipes are frequently used in the oil and gas industries. Failure of such pipes may be occurred due to the crack growth initiated in the weld zone. At service conditions, cracks existing in these pipes usually experience complex tensile-shear deformations. For estimating the onset of fracture in the cracked pipes during their service life it is necessary to obtain the stress intensity factors. Hence in this paper, several 3D semi elliptical cracks initiated longitudinally along the weld line in the outer and inner wall of a welded pipe with different aspect ratios ranging from 0.5 to 1 are analyzed using ABAQUS software. It is shown that the contribution of all three modes (KI, KII and KIII) may affect significantly the onset of fracture in the investigated pipes. However, the effect of mode I deformation (KI) is more pronounced than the shear mode deformations (KII and KIII). It was also shown that the value of equivalent stress intensity factor in the inner wall is greater than the outer wall of cracked pipe.
Keywords
longitudinally seam weld pipe
semi elliptical crack
Stress intensity factors
mixed mode loading
finite element method
Subjects
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