ANALYSIS OF PARTICULATE COMPOSITE BEHAVIOR BASED ON NONLINEAR ELASTICITY AND AN IMPROVED MORI-TANAKA THEORY

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Authors
  1. Wong, F.C.
Corporate Authors
Defence Research Establishment Valcartier, Valcartier QUE (CAN)
Abstract
A micromechanical model for the analysis of particulate mechanical behavior is presented. Nonlinear effects are introduced in the model by a nonlinear elastic description of the matrix and through a modulus degradations routine. The first part of the study uses the experimental data from a range of glass bead/HTPB composites to back calculate the model parameters. The results showed that the model gave a good representation of the processes believed to control mechanical behavior. These processes include partial particle debonding and progressive debonding from the largest to smallest particles throughout the strain history. The second part of the study examines the sensitivity of the model results to small changes in the adjustable input parameters. The residual bond in a debonded particle was found to have a dominating effect on the calculated results. Based on the sensitivity results, "best guess" interaction and debonding parameters were selected to examine the predictive capability of the model. For glass bead/HTPB composites, the predicted composite stresses were within 10% of the experimental data. Dilatation was usually over-predicted. For glass bead/polyethylene and glass bead/polyurethane data found in the literature, predicted composite stresses were within 15% to 25%, respectively. TRUNCATED
Keywords
Debonding;Eigenstrain;Energy balance;Micromechanics;Modulus data;Particle interaction
Report Number
DREV-9815 —
Date of publication
01 Sep 1998
Number of Pages
224
DSTKIM No
98-02736
CANDIS No
509553
Format(s):
Hardcopy;Document Image stored on Optical Disk

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