Creep constraint analysis and constraint parameter solutions for circumferential surface cracks in pressurized pipes. (November 2015)

• Record Type: Journal Article
• Authors: Liu, S.; Wang, G.Z.; Tu, S.T.; Xuan, F.Z.
• Is Part Of: Engineering fracture mechanics. Volume 148(2015)
• Page Start: 1
• Page End: 14
• Publication Date: 2015-11
• Subjects: Creep constraint -- Constraint parameter solutions -- Circumferential surface crack -- Pressurized pipes -- Creep crack growth rate; Fracture mechanics -- Periodicals; Rupture, Mécanique de la -- Périodiques; Fracture mechanics; Periodicals; 620.112605
• DOI: 10.1016/j.engfracmech.2015.09.012
• Languages: English
• ISSNs: 0013-7944

Abstract

Highlights: Creep constraints for circumferential surface cracks in cracked pipes are analyzed. Solutions of creep constraint parameter R ∗ for circumferential cracks are obtained. Constraint level of circumferential cracks is lower than that of axial cracks. Constraint effect needs to be considered in creep life assessment of cracked pipes. Abstract: Creep crack-tip constraints for inner circumferential surface cracks in pressurized pipes have been analyzed by three-dimensional finite element method and the constraint parameter R ∗ solutions have been obtained for different pipe geometries and crack sizes. It has been shown that the constraint level of circumferential cracks is lower than that of axial cracks, and the constraint effects need to be considered in creep life assessments of pressurized pipes. The benefits from incorporating constraint effects are greater for the circumferential cracks than for the axial cracks and for the shallower and shorter cracks than for the deeper and longer cracks.