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Polymers 2018, 10(8), 903;

Nonlinear Material Model for Quasi-Unidirectional Woven Composite Accounting for Viscoelastic, Viscous Deformation, and Stiffness Reduction

Institute of Polymer Technology, University Erlangen-Nuremberg, 91054 Erlangen, Germany
State Key Laboratory of High Performance and Complex Manufacturing, Central South University, Changsha 410083, China
Author to whom correspondence should be addressed.
Received: 11 July 2018 / Revised: 6 August 2018 / Accepted: 7 August 2018 / Published: 11 August 2018
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To clarify the individual contribution of viscoelastic and viscous deformation to the global nonlinear response of composites, multilevel cyclic loading-unloading recovery tensile tests were carried out. The experimental results show that there is a linear relationship between the viscous strain and viscoelastic strain of composites, regardless of the off-axis angle or loading stress level. On the basis of experimental results, a coupled damage-plasticity constitutive model was proposed. In this model, the plasticity theory was adopted to assess the evolution of viscous strains. The viscoelastic strain was represented as a linear function of viscous strains. Moreover, the Weibull function of the effective stress was introduced to evaluate the damage variables in terms of stiffness reduction. The tensile stress-strain curves, predicted by the proposed model, showed a good agreement with experimental results. View Full-Text
Keywords: viscoelastic strain; viscous strain; composites viscoelastic strain; viscous strain; composites

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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).

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Zhai, Z.; Jiang, B.; Drummer, D. Nonlinear Material Model for Quasi-Unidirectional Woven Composite Accounting for Viscoelastic, Viscous Deformation, and Stiffness Reduction. Polymers 2018, 10, 903.

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