Prediction of mechanical properties of irradiated material is a primary issue for the nuclear industry. Experimental determination of mechanical properties is not always viable. This is mainly due to high cost of irradiations and problem of sample activation. Sample activation problem may be avoided by ion (proton) irradiation but irradiation damage depth is of few hundred microns. So, for such cases micro specimen are used for experimentation. In the present study both numerical and experimental technique was availed. For numerical analysis using FEM, the Gurson-Tvergaard-Needleman constitutive equation was used. GTN model is a parameterized flow rule that implicitly contain void mechanism i.e. void growth, nucleation and coalescence which characterize ductile fracture. Effect of various Gurson parameters i.e. (fo,fn,fc,ff & fmax) on the stress strain curve were studied. The natures of the different parameters were used to fit experimental stress-strain curve hence calibrating the G-T-N model. The effect of irradiation on Gurson parameters was studied using experimental results by Matijasevic & Almazouzi [6] by FEM.
展开▼
