Advanced Modeling of Failure Modes in Metals
Final rept. 15 Mar 86-14 Mar 87.
BROWN UNIV PROVIDENCE RI DIV OF ENGINEERING
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Three studies have been carried out under this contract 1 A numerical study of the effects of material rate sensitivity and void nucleation on fracture initiation 1 2 An analysis of the temperature and rate dependence of Charpy V-notch energies for a high nitrogen steel 2 and 3 a study of material rate dependence and mesh sensitivity in localization problems 3. The first two of these studies clearly illustrate that analyses of failure processes based on non-classical constitutive models exhibit phenomenologies that do not emerge from calculations based on classical plasticity theories and that these phenomenologies are consistent with experimental observations. The third study shows how accounting for the rate of dependence of plastic flow can eliminate a pathological mesh sensitivity associated with rate independent material models. The mesh sensitivity of solutions to localization problems is a key issue that must be addressed to obtain reliable failure predictions for ductile solids.
- Metallurgy and Metallography