D1.2 Test methodologies to determine fracture toughness in thin and thick sheets – Abstract

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D1.2 Test methodologies to determine…

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Create Date June 17, 2021
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In this deliverable, the methodologies for characterizing the fracture toughness of thin and thick ductile metal sheets are described. Different aluminium alloy, stainless steel and advanced high strength steel sheets from 0.17 to 6.0 mm are investigated. Fracture toughness is evaluated by means of Essential Work of Fracture (EWF) tests and J-integral measurements.

The application of standard fracture mechanics procedures for J-integral evaluation in thin sheets is discussed. Furthermore, an innovative procedure for preparing thin high strength metal sheet specimens (1-3 mm) for fracture toughness testing is described. The EWF results obtained with the new procedure are validated. For thick plates, the use of alternative specimens for EWF testing is investigated and a DIC-based method is proposed to measure the crack advance during J-integral measurements

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