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Polymers
Volume 14
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10.3390/polym14030568
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Article

An Engineering Prediction Model for Stress Relaxation of Polymer Composites at Multiple Temperatures

by
Xiaochang Duan
1,
Hongwei Yuan
2,
Wei Tang
2,
Jingjing He
3,* and
Xuefei Guan
1,*
1
Graduate School of China Academy of Engineering Physics, Beijing 100193, China
2
Institute of Chemical Materials, China Academy of Engineering Physics, Mianyang 621900, China
3
School of Reliability and Systems Engineering, Beihang University, Beijing 100191, China
*
Authors to whom correspondence should be addressed.
Polymers 2022, 14(3), 568; https://doi.org/10.3390/polym14030568
Submission received: 24 December 2021 / Revised: 25 January 2022 / Accepted: 26 January 2022 / Published: 30 January 2022
(This article belongs to the Section Polymer Processing and Engineering)
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Abstract

This study develops an engineering prediction model for stress relaxation of polymer composites, allowing the prediction of stress relaxation behaviour under a constant strain, over a range of temperatures. The model is based on the basic assumption that in the stress relaxation process the reversible strain is transformed to irreversible strain continuously. A strain-hardening model is proposed to incorporate nonlinear elastic behaviour, and a creep rate model is used to describe the irreversible deformation in the process. By using stress relaxation data at different temperatures, under different strains, the dependence on temperature and initial strain of the model parameters can be established. The effectiveness of the proposed model is verified and validated using three polymer composite materials. The performance of the model is compared with three commonly used stress relaxation models such as the parallel Maxwell and Prony series models. To ease the use of the proposed model in realistic structural problems, a user subroutine is developed, and the stress relaxation of a plate structure example is demonstrated.
Keywords: polymer-matrix composites (PMCs); stress relaxation; analytical modelling polymer-matrix composites (PMCs); stress relaxation; analytical modelling

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MDPI and ACS Style

Duan, X.; Yuan, H.; Tang, W.; He, J.; Guan, X. An Engineering Prediction Model for Stress Relaxation of Polymer Composites at Multiple Temperatures. Polymers 2022, 14, 568. https://doi.org/10.3390/polym14030568

AMA Style

Duan X, Yuan H, Tang W, He J, Guan X. An Engineering Prediction Model for Stress Relaxation of Polymer Composites at Multiple Temperatures. Polymers. 2022; 14(3):568. https://doi.org/10.3390/polym14030568

Chicago/Turabian Style

Duan, Xiaochang, Hongwei Yuan, Wei Tang, Jingjing He, and Xuefei Guan. 2022. "An Engineering Prediction Model for Stress Relaxation of Polymer Composites at Multiple Temperatures" Polymers 14, no. 3: 568. https://doi.org/10.3390/polym14030568

APA Style

Duan, X., Yuan, H., Tang, W., He, J., & Guan, X. (2022). An Engineering Prediction Model for Stress Relaxation of Polymer Composites at Multiple Temperatures. Polymers, 14(3), 568. https://doi.org/10.3390/polym14030568

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