Estimation procedure of J-resistance curves for SE(T) fracture specimens using unloading compliance |
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Authors: | Sebastian Cravero |
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Affiliation: | Department of Naval Architecture and Ocean Engineering, Av. Prof. Mello Moraes, 2231 (PNV-EPUSP), São Paulo SP 05508-030, Brazil |
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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. |
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Keywords: | Resistance curves Ductile fracture Unloading compliance SE(T) specimen η-Factor |
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