Computational modeling of through-thickness dynamic impact response in cross-rolled Ti-6Al-4V plates

Author： Kad Bimal Schoenfeld Scott Burkins Matthew

ISSN： 1543-1940

Source： Metallurgical and Materials Transactions A, Vol.33, Iss.13, 2002-03, pp. : 937-947

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Abstract

The through-thickness ballistic impact response for extra-low-interstitial (ELI)-grade Ti-6Al-4V crossrolled and heat-treated plates is numerically simulated, taking into account specific material textures. Ballistic tests suggest that the incidence of material plugging is affected by specific thermal/mechanical processing paths above and below the β-transus temperature. Ti-6Al-4V polycrystalline aggregates are nominally textured via routine rolling-deformation and thermal-processing schedules in the α+β or β-phase fields. Thus, realistic processing textures, viz., the basal, transverse, as well as an idealized random texture, are simulated via a two-dimensional (2D) constitutive model for slip and twinning (treated here as pseudoslip) prescribed for the hcp single crystal. The polycrystal is constructed by incorporating the material theory into a finite-element model that explicitly represents a spatial distribution of single crystals. The polycrystalline mechanical response is examined with respect to macroscopic shear loading, such as that which may take place during dynamic punch-through processes. A ranking of the material textures is prescribed via numerically derived measures of external work performed. Results indicate that transverse textures generated by thermal/mechanical processing in the β-phase field are particularly susceptible to impact failures. Such microstructural and orientation-sensitive rankings are a keen marker of material performance and offer a refinement over the quasistatically generated Mil-A-4077 acceptance criterion for ballistic impact applications.