Journal of Science  and Technology of Composites

Journal of Science and Technology of Composites

Micromechanical Modeling of Creep Behavior of Continuous Fiber-Reinforced Thermoplastic Composite and Long-Fiber Reinforced Composite

Document Type : Research Paper

Authors
Department of Mechanical Engineering, Faculty of Engineering, Shahid Chamran University of Ahvaz, Ahvaz, Iran.
Abstract
Due to the characteristics of thermoplastic composites, their use has received increasing attention. The present research proposes a novel micromechanics-based method for predicting the long-term creep behavior of thermoplastics reinforced with unidirectional continuous fibers (UD) and long fibers (LFT), such as carbon/PEEK and glass/polyethylene composites. Polyethylene and PEEK thermoplastic materials exhibit nonlinear viscoelastic properties, which are modeled using the four-element Berger's model. Experimental results have demonstrated that Berger's four-element model accurately predicts both the short-term and long-term behavior of thermoplastic polyethylene and PEEK matrices. Additionally, the behavior of glass and carbon fibers is considered elastic in this study. Using the micromechanical model of the bridging matrix, the influence of the nonlinear viscoelastic matrix on the long-term creep behavior of composites has been predicted and validated. A comparison of the modeling results with available experimental data shows a maximum difference of 12% in predicting the long-term creep behavior of thermoplastic composites reinforced with continuous fibers (UD) and a maximum difference of 10% in thermoplastic composites reinforced with long fibers (LFT).
Keywords

Subjects


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