Article ID Journal Published Year Pages File Type
766856 Engineering Fracture Mechanics 2014 12 Pages PDF
Abstract

•A 40 kJ pendulum machine for DWTT tests with well traceability and reproducibility.•Analytical regression method to estimate CTOA over stable cracking of specimens.•Key-curve method to monitor the dynamic crack extension of standard DWTT samples.•Experimental solution to obtain material parameters (A*σf) for DWTT-like specimens.

A regression based algorithm, load-line displacement method has been developed from the Martinelli–Venzi ductile fracture model to measure the crack-tip-opening-angle (CTOA) of high strength and toughness pipeline steels. Key-curve method is employed on the instrument force–displacement curve to estimate the dynamic cracking behavior of a standard pressed-notch DWTT specimen, also conveniently to identify the stable fracture propagation. From the above laboratory procedure, the critical CTOA is found to be constant over the steady-state stage, independence of the thickness in the range 19–31 mm as studied.

Related Topics
Physical Sciences and Engineering Engineering Mechanical Engineering
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