Lei Chen Fenghua Zhou Tiegang Tang. Finite element simulations of the high velocity expansion and fragmentation of ductile metallic rings[J]. Chinese Journal of Theoretical and Applied Mechanics, 2011, 43(5): 861-870. DOI: 10.6052/0459-1879-2011-5-lxxb2010-675
Citation:
Lei Chen Fenghua Zhou Tiegang Tang. Finite element simulations of the high velocity expansion and fragmentation of ductile metallic rings[J]. Chinese Journal of Theoretical and Applied Mechanics, 2011, 43(5): 861-870. DOI: 10.6052/0459-1879-2011-5-lxxb2010-675
Lei Chen Fenghua Zhou Tiegang Tang. Finite element simulations of the high velocity expansion and fragmentation of ductile metallic rings[J]. Chinese Journal of Theoretical and Applied Mechanics, 2011, 43(5): 861-870. DOI: 10.6052/0459-1879-2011-5-lxxb2010-675
Citation:
Lei Chen Fenghua Zhou Tiegang Tang. Finite element simulations of the high velocity expansion and fragmentation of ductile metallic rings[J]. Chinese Journal of Theoretical and Applied Mechanics, 2011, 43(5): 861-870. DOI: 10.6052/0459-1879-2011-5-lxxb2010-675
In this paper, we numerically simulated the freeexpansion and fragmentation processes of an OFHC ring under an initialvelocity. The conventional Johnson-Cook thermo-viscoplastic constitutivemodel was used to describe the dynamic plastic behavior of the material. TheJohnson-Cook failure model incorporating a cohesive fracture criterion wasused to model the separation progress of the material. ABAQUS/Explicit codewith element erosion was used for the numerical simulations. Multiplesimulations were conducted with a same initial velocity on these meshes,creating a group of fragment samples. The average fragment sizes of eachsample group were obtained. It was found that the Grady-Kipp model based onthe momentum diffusion mechanism gives reasonably close predictions of thefragment sizes; The FEM simulation results show apparent unloading waves(the Mott wave) propagations, confirming that the momentum diffusion didcontrol the 1D ductile fragmentation process.
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