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- W201975401 abstract "The high strain rate response of an AlN/AlN/Al composite manufactured by Lanxide Armor Products, Inc., has been studied through normal and pressure‐shear plate impact experiments. Differences in the measured shear resistance, as a function of the impact configuration, motivated the examination of the material response by means of a microcracking multiple‐plane model and a continuum elasto‐viscoplastic constitutive model. Numerical simulations of the normal impact experiments do not support microcracking as the dominant inelastic mechanism. By contrast, an elasto‐viscoplastic description of the material behavior predicts the main features of the normal stress history and the thickness dependence of the Hugoniot elastic limit. Nonetheless, the elasto‐viscoplastic model cannot reproduce both the normal and pressure‐shear experiments with a single set of model parameters. The inadequacy of the continuum elasto‐viscoplastic model seems to result from the isotropic assumption embodied in its formulation. The shear resistance measured in the pressure‐shear experiments is adequately predicted by a microcracking multiple‐plane model. The agreement seems to hinge in the continuous shearing of the material on a micro‐localized fashion, i.e. only one orientation becomes dominant and controls the inelastic shear deformation rate. This event does not occur in the normal impact configuration, in which the amount of inelasticity is primarily controlled by the elastic compressibility of the material. These findings explain the higher sensitivity to damage and microplasticity observed in the pressure‐shear configuration, as well as the softer material response recorded in this configuration." @default.
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- W201975401 date "1994-01-01" @default.
- W201975401 modified "2023-09-26" @default.
- W201975401 title "High strain rate modeling of ceramics and ceramic composites" @default.
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- W201975401 doi "https://doi.org/10.1063/1.46434" @default.
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