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Frontiers of Mechanical Engineering

Front. Mech. Eng.    2020, Vol. 15 Issue (3) : 475-483
Multiscale model of micro curing residual stress evolution in carbon fiber-reinforced thermoset polymer composites
Xinyu HUI1, Yingjie XU1,2(), Weihong ZHANG1
1. State IJR Center of Aerospace Design and Additive Manufacturing, School of Mechanical Engineering, Northwestern Polytechnical University, Xi’an 710072, China
2. Shaanxi Engineering Laboratory of Aerospace Structure Design and Application, School of Mechanical Engineering, Northwestern Polytechnical University, Xi’an 710072, China
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In this study, the micro curing residual stresses of carbon fiber-reinforced thermoset polymer (CFRP) composites are evaluated using a multiscale modeling method. A thermochemical coupling model is developed at the macroscale level to obtain the distributions of temperature and degree of cure. Meanwhile, a representative volume element model of the composites is established at the microscale level. By introducing the information from the macroscale perspective, the curing residual stresses are calculated using the microscale model. The evolution of curing residual stresses reveals the interaction mechanism of fiber, matrix, and interphase period during the curing process. Results show that the curing residual stresses mostly present a tensile state in the matrix and a compressive state in the fiber. Furthermore, the curing residual stresses at different locations in the composites are calculated and discussed. Simulation results provide an important guideline for the analysis and design of CFRP composite structures.

Keywords CFRP      curing residual stress      multiscale modeling      finite element method     
Corresponding Author(s): Yingjie XU   
Just Accepted Date: 28 June 2020   Online First Date: 31 July 2020    Issue Date: 03 September 2020
 Cite this article:   
Xinyu HUI,Yingjie XU,Weihong ZHANG. Multiscale model of micro curing residual stress evolution in carbon fiber-reinforced thermoset polymer composites[J]. Front. Mech. Eng., 2020, 15(3): 475-483.
Fig.1  Atomic force microscope observation of the interphase. Reprinted with permission from Ref. [28] from Elsevier.
Fig.2  Illustration of the multiscale modeling framework.
Fig.3  Finite element model of the macroscale composite plate.
Fig.4  Finite element model of the microscale RVE.
Fig.5  Temperature distribution in the macroscale model after the curing cycle.
Fig.6  Evolution of (a) temperature and (b) degree of cure with curing time.
Fig.7  Distributions of the curing residual stresses of the microscale model after the curing cycle in the (a) fiber, (b) the interphase, and (c) the matrix.
Fig.8  Evolution of curing residual stresses in the (a) matrix, (b) fiber, and (c) interphase.
Fig.9  Illustration of the five reference points at different locations in the macroscale model.
Fig.10  Temperature and degree of cure at the reference points after curing.
Fig.11  Curing residual stresses at the reference points after curing.
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