This work provides an estimation procedure to determine J-resistance curves for SE(T) (single edge notched tension) fracture specimens using the unloading compliance technique and the eta-method. In the present study, attention is directed to pin-loaded SE(T) specimens with varying geometry and crack sizes but representative solutions are also included for clamped SE(T) specimens. 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 versus displacement curves. The extensive plane-strain analyses enable numerical estimates of the nondimensional compliance, my, and parameters eta and gamma for a wide range of specimen geometries and material properties characteristic of structural and pipeline steels. Laboratory testing of an API (American Petroleum Institute) 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.
Evaluation of crack growth resistance curves for pipeline steels using constraint designed fracture specimens
Die Bewertung der Risswachstumswiderstandskurven für Pipeline-Stahl unter Verwendung von entsprechend geformten Bruchproben
2007
10 Seiten, 22 Quellen
Aufsatz (Konferenz)
Englisch
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