Defense Technical Information Center (DTIC) · 1961 · 48 citations · 0 references
EngineeringMaterials EngineeringMaterials ScienceMechanical Behavior Of MaterialsStructural MaterialsDamage MechanicsFracture MechanicsFracture PropagationFracture ResistanceFracture ToughnessStrength Of MaterialsToughness
A simple model of the fracture phenomenon in sheet is suggested based essentially upon the assumption that the shear lip formation is a volume sensitive mechanism whereas flat fracture is essentially a surface phenomenon. A critical shear lip width is hypothesized; this concept is substantiated and is shown to lead to the variations in shear lip width with thicknesses that are experimentally observed. Furthermore, the fracture toughness-thickness relationship constructed by the simple linear superposition of the above two fracture mechanisms predicts identically the observed fracture toughness. A numerical illustration indicates the use of test results to calculate the G sub c versus t curve for a given temperature over the entire range of thicknesses. (Author)