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A Synergetic Micromechanics Model For Fiber Reinforced Composites

Electronic Theses of Indian Institute of Science

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Title A Synergetic Micromechanics Model For Fiber Reinforced Composites
 
Creator Padhee, Srikant Sekhar
 
Subject Composite Materials
Torsion Method
Variational Asymptotic Method (VAM)
Composite Cylinders Model
Representative Volume Element (RVE)
Fiber Reinforced Composites
Micromechanics
Micro-mechanical Model
Matrix Cracking
Materials Science
 
Description Composite materials show heterogeneity at different length scales. hence concurrent multiscale analysis is the only reliable method to analyze them. But unfortunately there is no concurrent multi-scale strategy that is efficient, and accurate while addressing all kinds of problems. This lack of reliability is partly because there is no micro-mechanical model which inherently keeps all relevent global information with it. This thesis tries to fill this gap. The
presented micro-mechanical model not only homogenizes the micro-structure but also keeps the global information with it. Most of the micro-mechanical models in the literature extract the Representative Volume Element (RVE) from the continuum for analysis which results in loss of information and accuracy. In the present approach also, the RVE has been extracted
from the continuum but with the major difference that all the macro/meso-scopic parameters are accounted for. Five macro/meso-scopic one dimensional parameters have been defined which completely define the effect of continuum. 11 for one dimensional stretch, _1 for torsion, __ (_ = 2, 3) for bending and _33 for uniform pressurization due to the presence
of the continuum. Further, the above macro/meso-scopic parameters are proven, by the asymptotic, theory to be constant at a cross section but vary, in general, over the length of the fiber. Hence, the analysis is valid for any location and is not restricted to any local domain.
Three major problems have been addressed:
• Homogenization and analysis of RVE without any defects
• Homogenization and analysis of RVE with fiber-matrix de-bonding
• Homogenization and analysis of RVE with radial matrix cracking.
Variational Asymptotic Method (VAM) has been used to solve the above mentioned problems
analytically. The results have been compared against standard results in the literature and
against 3D FEA.
At the end, results for “Radial deformation due to torsion” problem will be presented
which was solved “accidentally.”
 
Contributor Harusampath, Dineshkumar
 
Date 2014-09-08T07:09:25Z
2014-09-08T07:09:25Z
2014-09-08
2011-06
 
Type Thesis
 
Identifier http://etd.iisc.ernet.in/handle/2005/2381
http://etd.ncsi.iisc.ernet.in/abstracts/3064/G25238-Abs.pdf
 
Language en_US
 
Relation G25238