Estimation procedure of J-resistance curves for SE(T) fracture specimens using unloading compliance

Abstract This work provides an estimation procedure to determine J-resistance curves for pin-loaded and clamped SE(T) fracture specimens using the unloading compliance technique and the η-method. A summary of the methodology upon which J and crack extension are derived sets the necessary framework to determine crack resistance data from the measured load vs. displacement curves. The extensive plane-strain analyses enable numerical estimates of the nondimensional compliance, μ, and parameters η and γ for a wide range of specimen geometries and material properties characteristic of structural and pipeline steels. Laboratory testing of an API 5L X60 steel at room temperature using pin-loaded SE(T) specimens with side-grooves provide the load–displacement data needed to validate the estimation procedure for measuring the crack growth resistance curve for the material. The results presented here produce a representative set of solutions which lend further support to develop standard test procedures for constraint-designed SE(T) specimens applicable in measurements of crack growth resistance for pipelines.

[1]  Claudio Ruggieri,et al.  Correlation of fracture behavior in high pressure pipelines with axial flaws using constraint designed test specimens––Part I: Plane-strain analyses , 2005 .

[2]  J. A. Joyce.  Manual on Elastic-Plastic Fracture: Laboratory Test Procedures , 1996 .

[3]  John R. Rice,et al.  Some further results of J-integral analysis and estimates. , 1973 .

[4]  B. Moran,et al.  A general treatment of crack tip contour integrals , 1987 .

[5]  James A. Joyce,et al.  Effects of constraint on upper shelf fracture toughness , 1995 .

[6]  Kumar,et al.  Engineering approach for elastic-plastic fracture analysis , 1981 .

[7]  B. Rigling,et al.  Effect of height to width ratio on K and CMOD solutions for a single edge cracked geometry with clamped ends , 1998 .

[8]  Henryk G. Pisarski,et al.  Fracture Toughness Estimation for Pipeline Girth Welds , 2002 .

[9]  Ashok Saxena,et al.  Nonlinear Fracture Mechanics for Engineers , 1998 .

[10]  H. Saunders,et al.  Advanced Fracture Mechanics , 1985 .

[11]  E. M. Hackett,et al.  Effects of Crack Depth and Mode of Loading on the J-R Curve Behavior of a High-Strength Steel , 1993 .

[12]  Claudio Ruggieri,et al.  Correlation of fracture behavior in high pressure pipelines with axial flaws using constraint designed test specimens. Part II: 3-D effects on constraint , 2006 .

[13]  William T. Becker,et al.  Failure analysis and prevention , 2002 .

[14]  Hiroshi Tada,et al.  The stress analysis of cracks handbook , 2000 .

[16]  C. Turner,et al.  Method for Laboratory Determination of J c , 1976 .

[17]  D. Coker,et al.  Stress intensity factor and compliance solutions for a single edge notched specimen with clamped ends , 1994 .

[18]  J. Rice.  A path-independent integral and the approximate analysis of strain , 1968 .

[19]  Bård Nyhus,et al.  SENT Specimens an Alternative to SENB Specimens for Fracture Mechanics Testing of Pipelines , 2003 .

[20]  Arne S. Gullerud,et al.  WARP3D-Release 10.8: Dynamic Nonlinear Analysis of Solids using a Preconditioned Conjugate Gradient Software Architecture , 1998 .

[21]  J. Hutchinson.  Fundamentals of the Phenomenological Theory of Nonlinear Fracture Mechanics , 1983 .