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A two failure criteria model based on plasticity limit load (LL) theory and linear elastic fracture mechanics (LEFM) is proposed for characterizing the fracture behavior of ductile structural metals. Failure is considered to occur at the lower load predicted by the two failure criteria. The variables involved in the two failure criteria model are: fracture toughness (Kc), tensile strength (Su), relative crack length (a/W), and geometry. A dimensionless parameter, Kc/SuW1/2 was defined. The fracture toughness failure criterion was found to dominate at low values of Kc/SuW1/2, and the LL failure criterion controls fracture at large values.
ductile fracture, fracture properties, mechanical properties, cracks, crack propagation, brittle fracture, plastic deformation toughness, steels, fracture (materials)
Senior research engineer, Caterpillar Tractor Co., Peoria, Ill.
Professor of Civil and Metallurgical Engineering, University of Illinois, Urbana, Ill.