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A computational model of viscoplasticity and ductile damage for impact and penetration. (English) Zbl 1028.74043
The authors develop a constituve model coupling viscoplastic material behaviour with ductile damage for impact and penetration related problems. The constitutive model includes linear thermoelasticity, von Mises yield criterion, associated flow rule, nonlinear isotropic strain hardening, strain-rate hardening, temperature softening due to adiabatic heating, isotropic ductile damage and failure. Four relatively simple uniaxial tensile tests which are described in detail in the paper, are needed in order to define the material constants required by the constitutive model. The calibration procedure is based on a simple least squares fitting. The computational model is verified by the corresponding finite elements simulations of tensile tests. Furthermore, the finite element simulation of a real ballistic penetration test based on the calibrated and verified constitutive model is validated against the corresponding experimental results. Both tests show a good agreement between simulated and measured results.
Reviewer: U.Langer (Linz)

MSC:
74R15 High-velocity fracture
74C10 Small-strain, rate-dependent theories of plasticity (including theories of viscoplasticity)
74S05 Finite element methods applied to problems in solid mechanics
74R20 Anelastic fracture and damage
74M20 Impact in solid mechanics
74F05 Thermal effects in solid mechanics
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