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Numerical simulation of plugging failure in ballistic penetration. (English) Zbl 1057.74035
Summary: A coupled computational material model of viscoplasticity and ductile damage has been developed and implemented in LS-DYNA. This model gives good agreement between numerical simulations and experimental observations of plugging failure in ballistic penetration, without the use of inverse modelling or predefined defects. However, even if the model constants can be determined from relatively simple uniaxial tensile tests, the computational model is rather comprehensive. In this paper numerical results obtained by using the fully coupled computational model are compared with results obtained from less sophisticated versions of the material model. The differences between the numerical results are pointed out and discussed, and details from some of the simulations are shown. To validate the accuracy of the computational model, references are made to experimental observations from gas-gun penetration tests on 8-mm thick Weldox 460 E steel plates.

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