Abstract
Adiabatic shear bands are localized regions of intense plastic deformation that form when materials are subjected to high-strain-rate loading and are generally considered to be precursors to fracture. The objectives of this paper were to study adiabatic shear bands generated in commercially pure titanium and pearlitic AISI4140 steel utilizing a controlled- penetration impact setup and to model the dynamic shearband formation process using a Lagrangian finite- element code. Results showed that utilization of the controlled- penetration impact experimental apparatus significantly lowered the required impact velocity for formation of adiabatic shear bands in the materials tested. The length and location of the formed shear bands were controllable and extremely sensitive to the prescribed depth of penetration, allowing for the generation of crack- free shear bands. Microhardness testing of the band material revealed it to be considerably harder than the surrounding material, which possibly indicates rapid quenching of the heated band material. The finite- element simulation results showed that it is possible to realistically model adiabatic shear banding for a range of different materials.
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