Simulating the microstructural failure mechanism of shear bands in steel

Abstract eng:
High strain rate plastic deformation of metals results in the formation of localized zones of severe shear strain known as adiabatic shear bands (ASBs), which are a precursor to shear failure. The formation of ASBs in AISI 4340 steel was examined experimentally and through simulations. Testing parameters included heat treatment temperatures, testing temperature, and impact momentum using the Direct Impact Hopkinson Pressure Bar (DIHPB). Using experimental stress strain response data, a two dimensional axi-symmetric simulation model was developed in Matlab and explicit FEA software LSDYNA to simulate ASB formation in AISI 4340 steel. The model uses the Voronoi tessellation to generate the prior austenite grain structure of the steel, and also generates geometry for the martensite sub-grain lath blocks and a grain boundary geometry representative of the cross section of the specimens. The model was discretized using a meshless Lagrangian formulation. Simulation results closely matched experimental findings.

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