RESEARCH PAPERS: Special Issue on Time-Dependent Behaviors of Polymer Matrix Composites and Polymers

Damage-Induced Modeling of Elastic-Viscoelastic Randomly Oriented Particulate Composites

[+] Author and Article Information
Yong-Rak Kim

Department of Civil Engineering, W351 Nebraska Hall, University of Nebraska-Lincoln, Lincoln, NE 68588-0531ykim3@unl.edu

David H. Allen

Department of Engineering Mechanics, 114 Othmer Hall, University of Nebraska-Lincoln, Lincoln, NE 68588-0642dhallen@unlnotes.unl.edu

Gary D. Seidel

Department of Aerospace Engineering, 616D HRBB, Texas A&M University, College Station, TX 77843-3141gary-don@tamu.edu

J. Eng. Mater. Technol 128(1), 18-27 (May 04, 2005) (10 pages) doi:10.1115/1.2127960 History: Received August 12, 2004; Revised May 04, 2005

This paper presents a model for predicting the damage-induced mechanical response of particle-reinforced composites. The modeling includes the effects of matrix viscoelasticity and fracture, both within the matrix and along the boundaries between matrix and rigid particles. Because of these inhomogeneities, the analysis is performed using the finite element method. Interface fracture is predicted by using a nonlinear viscoelastic cohesive zone model. Rate-dependent viscoelastic behavior of the matrix material and cohesive zone is incorporated by utilizing a numerical time-incrementalized algorithm. The proposed modeling approach can be successfully employed for numerous types of solid media that exhibit matrix viscoelasticity and complex damage evolution characteristics within the matrix as well as along the matrix-particle boundaries. Computational results are given for various asphalt concrete mixtures. Simulation results demonstrate that each model parameter and design variable significantly influences the mechanical behavior of the mixture.

Copyright © 2006 by American Society of Mechanical Engineers
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Figure 1

Cross section of typical dense-graded asphalt concrete sample

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Figure 2

A general elastic-viscoelastic body containing discrete cracks

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Figure 3

Finite element modeling and boundary conditions

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Figure 4

Undamaged stress relaxation moduli of composite with different matrix material

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Figure 5

Comparison of dimensionless linear viscoelastic relaxation moduli between measured and predicted from finite element simulations

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Figure 6

Damaged behavior of composite with different matrix material at different strain rates

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Figure 7

Constant strain-rate monotonic loading test results

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Figure 8

Effect of critical cohesive zone displacement on composite behavior

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Figure 9

Effect of damage evolution law coefficient on composite behavior

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Figure 10

Effect of damage evolution law exponent on composite behavior

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Figure 11

Nodal displacements and elemental stress contour plots at different loading levels (stage 1 at 5s and stage 2 at 15s)



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