Constitutive Modeling and Simulation of Perforation of Targets by Projectiles

摘要: DOI: 10.2514/1.26011 The effective use of existing finite element codes in the direct simulation hypervelocity impacts by projectiles is limited dependence size localized failure regions on mesh and alignment. This gives rise to a nonphysical description penetration perforation processes. A micromechanical constitutive model that couples anisotropic thermoviscodamage mechanism with thermohypoelastoviscoplastic deformation presented here as remedy this situation. Explicit implicit microstructural length-scale measures, which preserve well-posed nature differential equations, are introduced through viscosity gradient localization limiters. Simple robust numerical algorithms for integration equations also presented. proposed unified extensions classical rateindependent return-mapping rate-dependent problems. simple computational algorithmisalsousedforimplementingthegradient-dependentequations.Thisalgorithmcanbeimplementedinthe without numerous modifications, compared current approaches integratinggradient-dependent models.Modelcapabilitiesarepreliminarilyillustrated forthedynamiclocalization inelastic flow adiabatic shear bands 12-mm-thick Weldox 460E steel plate deformable blunt projectile at various impact speeds.