Multiscale model of micro curing residual stress evolution in carbon fiber-reinforced thermoset polymer composites

Abstract

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

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Acknowledgements

This work was supported by the National Key Research and Development Program of China (Grant No. 2017YFB1102800) and the National Natural Science Foundation of China (Grant Nos. 11872310 and 51761145111).

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2020 Higher Education Press