Abstract
The paper deals with numerical studies of two - dimensional quasi static crack growth problems, for elastic - plastic materials with isotropic hardening behaviour. In particular, the FEM analyses regard centre - cracked panel, CCP, specimens, made up of Al2024-T3 alloy, subjected to monotonic increasing load histories, without any constraint about the intensity of the deformation. The main result of these studies is a new fracture criterion, based on the fracture property of the energy momentum tensor; during a quasi static crack propagation, the trace of the energy momentum tensor, evaluated at the current crack tip, attains a value which is independent of the crack length. Based on this property, the proposed fracture criterion is able to describe the crack growth resistance curve of aluminum alloys, in a good agreement with experimental tests.
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