Prediction of Elastic Constants of Short Flax Fiber Reinforced Composites Considering the Interfacial Property
XIONG Xiaoshuang1,2,3, ZHANG Zihao2, LI Qiaomin2, YU Lianqing2,3
1 Hubei Key Laboratory of Digital Textile Equipment, Wuhan Textile University, Wuhan 430200, China 2 School of Mechanical Engineering & Automation, Wuhan Textile University, Wuhan 430200, China 3 Hubei Engineering Technology Research Center of Functional Fiber Processing and Testing, Wuhan Textile University, Wuhan 430200, China
Abstract: The interfacial properties between fiber and matrix in natural fiber reinforced composites are poor and fluctuate greatly, which will have a signi-ficant influence on the final mechanical properties of the composites. In the paper, finite element models of unidirectional short flax fiber reinforced composites (SFFRC) using cohesive zone model were established to calculate the elastic constants of the unidirectional SFFRC with different interfacial stiffness. And then, the elastic constants of SFFRC with fiber random distribution were calculated by using the laminate plate theory, which are in good agreement with the tensile test results. On this basis, the effects of the interfacial stiffness (K0), the aspect ratio of fiber (ζ) and the factor of fiber distribution (λ) on the elastic constants of SFFRC were studied, and then a modified “rule-of-mixtures” (ROM) model for predicting the tensile modulus of SFFRC with randomly distributed fibers were proposed. The results show that the longitudinal tensile modulus (E1), transverse tensile modulus (E2) and longitudinal shear modulus (G12) of the composites decrease significantly with the decrease of K0 and increase gradually with the increase of ζ. The change of λ results in the change of fiber orientation angle and has different influence on the E1, E2 and G12 of the composites. The results of tensile modulus from the modified ROM model show good agreements with that from the tensile experiment when K0≤10 GPa/mm, indicating that the modified ROM model can effectively predict the tensile modulus of SFFRC with poor interface stiffness.
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2022, Vol. 36 
