The Grain Size and Porosity Dependent Constitutive Modeling for Nanocrystalline Ceramics with Small Plastic Deformation |
| Journal |
Key Engineering Materials (Volumes 353 - 358) |
| Volume |
Progresses in Fracture and Strength of Materials and Structures |
| Edited by |
Yu Zhou, Shan-Tung Tu and Xishan Xie |
| Pages |
50-53 |
| DOI |
10.4028/www.scientific.net/KEM.353-358.50 |
| Online since |
September, 2007 |
| Authors |
Jian Qui Zhou,
Yuan Ling Li
|
| Keywords |
Constitutive Modeling, Grain Size, Nanocrystalline Ceramics, Porosity, Yield Stress |
| Abstract |
In order to understand the grain size and porosity dependent mechanical behavior of porous,
multi-phase nanocrystalline ceramics, each phase is treated as a mixture of grain interior and grain
boundary, and pores are taken as a single phase. In conjunction with the secant-modulus approach and
iso-strain assumption, Budiansky’s self-consistent method is extended to build a constitutive model
for nanocrystalline ceramics with small plastic deformation. Based on the developed model, the
predicted yield strength (σ0.2) values of porous, multi-phase nanocrystalline ceramics with different
grain size and porosity are compared with experimental data in the literature, the comparison shows
that the predictions are in good agreement with the published data. This suggests that the developed
model is capable of describing the grain size and porosity dependent mechanical behaviors of
nanocrystalline ceramics with small plastic deformation. |
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