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Low Constraint Fracture Toughness Testing

October 19, 2010

Currently, there is not a standardized low-constraint test procedure that allows a more representative measurement of the material toughness.  EWI will be conducting an internal research program to evaluate the latest technology to generate a resistance curve using low-constraint single-edge-cracked tension geometry.  The specimen geometry and tension loading mode is designed to produce a level of crack-tip constraint that is similar to the constraint experienced in service for a surface circumferential flaw in a pipe subject to tension or bending loading.  This program will allow EWI to refine our current procedures with the latest technology.