Abstract
Coupled experimental and numerical analyses have been carried out to assess and validate the ductile damage parameter for fracture prediction in Mod. 9Cr–1Mo steel. Tensile tests were carried out on circumferential U-notched specimens and the fracture morphology has been studied to assess the mechanism of fracture. The Rice-Tracey model has been chosen as a suitable model to characterize the fracture mechanism in this steel. Parallel FEM simulations have been carried out to evaluate the damage parameter for crack initiation by correlating with experiments. Further, to validate the applicability of the established damage parameter over a range of stress triaxiality, tensile tests were carried out on flat centre-notched specimens having U-notch at an angle of 30°,45°,60° and 90° to the loading axis. Apparent crack initiation load and length of the damage zone ahead of the notch have been determined using digital image correlation analysis. The value of damage index ahead of notch was estimated from FEM simulations and the crack was considered to be initiated when the damage index exceeds a critical value over a critical distance along the maximum principle plane. The crack initiation load predicted from FEM simulations using the estimated damage parameter for Mod. 9Cr–1Mo steel is in reasonable agreement with the experiments.
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