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Damage Development in an Armor Ceramic Under Quasi‐Static Indentation
Author(s) -
Gamble Eleanor A.,
Compton Brett G.,
Deshpande Vikram S.,
Evans Anthony G.,
Zok Frank W.
Publication year - 2011
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1551-2916.2011.04472.x
Subject(s) - indentation , plasticity , residual stress , ceramic , materials science , finite element method , coalescence (physics) , residual , composite material , deformation (meteorology) , mechanics , structural engineering , computer science , physics , engineering , algorithm , astrobiology
The objective of the present study is to assess the capabilities of a recently developed mechanism‐based model for inelastic deformation and damage in structural ceramics. In addition to conventional lattice plasticity, the model accounts for microcrack growth and coalescence as well as granular flow following comminution. The assessment is made through a coupled experimental/computational study of the indentation response of a commercial armor ceramic. The experiments include examinations of subsurface damage zones along with measurements of residual surface profiles and residual near‐surface stresses. Extensive finite element computations are conducted in parallel. Comparisons between experiment and simulation indicate that the most discriminating metric in the assessment is the spatial extent of subsurface damage following indentation. Residual stresses provide additional validation. In contrast, surface profiles of indents are dictated largely by lattice plasticity and thus provide minimal additional insight into the inelastic deformation resulting from microcracking or granular flow. A satisfactory level of correlation is obtained using property values that are either measured directly or estimated from physically based arguments, without undue reliance on adjustable (nonphysical) parameters.