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Micromechanical analysis of stress relaxation response of fiber-reinforced polymers |
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| Authors: | Mohammad Tahaye Abadi |
| Affiliation: | 1. Division of Computational Mechanics, Ton Duc Thang University, Ho Chi Minh City, Viet Nam;2. Faculty of Civil Engineering, Ton Duc Thang University, Ho Chi Minh City, Viet Nam;3. Institute of Structural Mechanics, Bauhaus University Weimar, Germany;4. Department of Physics, Col.gio Lu.S.Ant.nio Verney, University Evora, Portugal;1. Institute of Production Management and Technology, Hamburg University of Technology, 21073 Hamburg, Germany;2. Department of Materials and Process Engineering, Daimler AG, 70546 Stuttgart, Germany;1. Centre for Innovative Structures and Materials, RMIT University, GPO Box 2476, Melbourne 3001, Australia;2. School of Automotive and Mechanical Engineering, Changsha University of Science and Technology, Changsha 410076, China |
| Abstract: | The paper describes a micromechanical method to determine the stress relaxation response of polymer composites consisting of linearly viscoelastic matrices and transversely isotropic elastic fibers. A representative unit cell is subjected to some prescribed axial and shear loadings to study and quantify the time-dependent behavior of composite materials. Closed-form analytical expressions are derived describing the anisotropic viscoelastic response of composite materials as functions of matrix and fiber properties. The present analytical expressions are employed to determine the stress relaxation behavior of a graphite/epoxy composite and the results are compared with the finite element analysis of the micromechanical model. Very good correlation between analytical expressions and numerical results is illustrated for the linearly anisotropic viscoelastic response of composite materials. |
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