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A micromechanical study of stress concentrations in composites

Title:

A micromechanical study of stress concentrations in composites

Ghayoor Karimiani, Hossein, Hoa, Suong V. and Marsden, Catharine C. (2017) A micromechanical study of stress concentrations in composites. Composites Part B: Engineering . ISSN 13598368 (In Press)

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Official URL: http://dx.doi.org/10.1016/j.compositesb.2017.09.00...

Abstract

Random and periodic representations of composite microstructures are inherently different both in terms of the resultant range of stresses that each phase carries as well as the total load over the entire volume comprising both matrix and fiber phases. In this study, an algorithm was developed to generate random representative volume elements (RVE) with varying volume fractions and minimum distances between fibers. The random microstructures were analyzed using finite element models (FEM) and the results compared to those for periodic microstructured RVEs in terms of the range of stress values, maximum stress, and homogenized stiffness values. Using a large number of random RVE analyses, a meaningful estimation for range and average maximum stress in the matrix phase was achieved. Results show that random microstructures exhibit a much larger range of stress values than periodic microstructures, resulting in an uneven distribution of load and distinct areas of high and low stress concentration in the matrix. It is shown that the maximum stress in the matrix phase, often responsible for failure initiation, is largely dependent on the random morphology, minimum distances between fibers, and volume fraction. Moreover, it is shown that the predicted overall load-carrying capacity of the matrix changes depending on the use of random or periodic microstructures.

Divisions:Concordia University > Gina Cody School of Engineering and Computer Science > Mechanical and Industrial Engineering
Item Type:Article
Refereed:Yes
Authors:Ghayoor Karimiani, Hossein and Hoa, Suong V. and Marsden, Catharine C.
Journal or Publication:Composites Part B: Engineering
Date:7 September 2017
Funders:
  • Natural Sciences and Engineering Research Council of Canada (NSERC)
Digital Object Identifier (DOI):10.1016/j.compositesb.2017.09.009
Keywords:Micromechanics; Representative volume element (RVE); Finite element; Random microstructure; Stress concentration
ID Code:983036
Deposited By: DANIELLE DENNIE
Deposited On:14 Sep 2017 13:18
Last Modified:01 Sep 2018 00:01

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