Characterization of creep crack-tip constraint levels for pressurized pipelines with axial surface cracks

2017 ◽  
Vol 114 ◽  
pp. 98-109 ◽  
Author(s):  
Lianyong Xu ◽  
Xingfu Zhang ◽  
Lei Zhao ◽  
Yongdian Han ◽  
Hongyang Jing
Keyword(s):  
Crack Tip ◽  
Surface Cracks ◽  
Creep Crack ◽  
Pressurized Pipelines ◽  
Crack Tip Constraint ◽  
Axial Surface

Analysis of 316H Creep Crack Initiation Data at 550℃ using A Crack Tip Constraint Parameter

2021 ◽  
pp. 107746
Author(s):  
Seung-Ho Lee ◽  
Hyun-Woo Jung ◽  
Yun-Jae Kim ◽  
Kamran Nikbin ◽  
Robert A. Ainsworth
Keyword(s):  
Crack Initiation ◽  
Crack Tip ◽  
Creep Crack ◽  
Crack Tip Constraint

Defect Assessments of Pipelines Using Constraint Designed SE(T) Specimens

2004 ◽  
Author(s):  
Sebastian Cravero ◽  
Claudio Ruggieri
Keyword(s):  
Plane Strain ◽  
Driving Force ◽  
Fracture Behavior ◽  
Strong Support ◽  
Crack Tip ◽  
Primary Objective ◽  
Potential Applicability ◽  
Pressurized Pipelines ◽  
Crack Tip Constraint ◽  
Fracture Specimens

This work presents a numerical investigation of crack-tip constraint for SE(T) specimens and axially surface cracked pipes using plane-strain, nonlinear computations. The primary objective is to gain some understanding of the potential applicability of constraint designed fracture specimens in defect assessments of pressurized pipelines and cylindrical vessels. The present study builds upon the J-Q approach using plane-strain solutions to characterize effects of constraint on cleavage fracture behavior for fracture specimens and cracked pipes. Under increased loading, each cracked configuration follows a characteristic J-Q trajectory which enables comparison of the corresponding crack-tip driving force. The results provide a strong support to use constraint-designed SE(T) specimens in fracture assessments of pressurized pipes and cylindrical vessels.

Quantifying the creep crack-tip constraint effects using a load-independent constraint parameter Q*

2016 ◽  
Vol 119 ◽  
pp. 320-332 ◽  
Author(s):  
Lianyong Xu ◽  
Xingfu Zhang ◽  
Lei Zhao ◽  
Yongdian Han ◽  
Hongyang Jing
Keyword(s):  
Crack Tip ◽  
Creep Crack ◽  
Constraint Effects ◽  
Crack Tip Constraint
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