Author(s)

H. Martikka

Abstract

The damage mechanics of steels is studied using experimental and theoretical methods. Tensile tests and other tests are performed on a low alloy steel with varied grain sizes. Experimental results are analyzed using computer programs to obtain true stress-true strain curves. These results are simulated using micro structural dislocation dynamics models and theories on grain boundary, solution and dispersion hardening of multiphase and dispersion hardened alloyed materials. Using these models the initial discontinuous yielding and subsequent work hardening is satisfactorily predicted. Temperature and strain rate effects are also included. The applicability of FEM based Gurson- Tvergaard structural damage models are tested in estimating localised neck

Keywords