ON THE PREDICTION OF MECHANICAL BEHAVIOR OF PARTICULATE COMPOSITES USING AN IMPROVED MORI-TANAKA METHOD

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Authors
  1. Wong, F.C.
Corporate Authors
Defence Research Establishment Valcartier, Valcartier QUE (CAN)
Abstract
New micromechanical models for the prediction of particulate composite mechanical behavior have been developed. The models use an energy balance concept to account for nonlinear behavior due to particle debonding and incorporate a composite modulus prediction routine based on a improved Mori-Tanaka method. This method permits particle interaction effects to be taken into account and allows the stiffness matrix for voids or vacuoles to be explicityly stated in the model. To demonstrate the characteristics of the improved Mori-Tanaka method, comparisons with 2-phase and 3-phase modulus data were made. The micromechanical models developed for void and vacuole formation were evaluated against available mechnical behavior data. Comparisons showed that the model derived for vacuole formation predicted the mechanical behavior correctly for two types of model composites which contained inclusion volume fractions ranging from 0.2 to 0.5. The a volume fraction of 0.22 of well-bonded particles suggests that the nonlinear matrix effects need to be included in the present model formulation.
Keywords
Micromechanics;Debonding;Energy balance;Eigenstrain;Modulus data;Particle interaction
Report Number
DREV-9514 —
Date of publication
01 Jan 1997
Number of Pages
110
DSTKIM No
97-00972
CANDIS No
501263
Format(s):
Hardcopy;Document Image stored on Optical Disk

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