Ductile fracture occurs due to micro-void nucleation, growth and, finally coalescence into micro-cracks. These micro-cracks grow as the deformation progresses. Nowadays, continuum damage mechanics model is employed as one of the tools to predict the micro-crack initiation. In this work, damage growth in different types of notched specimen in tension test is studied using this model. A new non-linear damage growth law proposed by the authors, based on the experimental results at IIT Kanpur, is used. It is well-known that, in round (i.e. without a notch) specimen, the triaxiality increases at the center but remains constant at the outer surface as the deformation progresses. However, in notched specimen, the trend of the variation of the triaxiality with equivalent plastic strain is different at the center than at the outer surface. Therefore, the location of the maximum damage and hence that of the micro-crack initiation can shift from the center to the outer surface depending on the notch radius. It is observed that the failure strain in notched specimen is much less than that in the round specimen as reported in the literature.
CitationKumar, Manoj; Dixit, P. M. Simulation of damage growth in pre-notched cylindrical test specimens using continuum damage mechanics model. A: COMPLAS XIII. "COMPLAS XIII : proceedings of the XIII International Conference on Computational Plasticity : fundamentals and applications". CIMNE ed. Barcelona: CIMNE, 2015, p. 620-631.
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