A Microscopic Cohesive Zone Model and Effects of Interface on the Transverse Mechanical Properties for Composites 


Vol. 22,  No. 5, pp. 1352-1365, May  2021
10.1007/s12221-021-0150-7


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  Abstract

The carbon fiber/epoxy matrix interface plays an important role in the behavior and damage onset of unidirectional fiber reinforced epoxy matrix composites and accurate modeling techniques are needed to study the effects of this complex region on the composite response. In this work, a microscopic cohesive zone model (MCZM) based on atomic potential energy is established for the interface. A multiscale analysis method is proposed for predicting the transverse mechanical properties of unidirectional fiber composites: (1) At the microscale, MCZM is established for the interface; (2) At the mesoscale, a unit cell model is established for the fiber, matrix and interface; and (3) At the macroscale, the homogenization method, failure criteria and damage degradation models are used for predicting the transverse mechanical properties. Subsequently, the transverse mechanical properties and the damage evolution process are simulated with the multiscale analysis method. A comparison between the simulations and experiments shows that: (1) The maximum errors of the predicted transverse modulus and transverse strength are -4.45 % and -1.28 %, respectively; and (2) MCZM can reflect the nonlinearity of epoxy matrix composite materials. Moreover, the effects of the interfacial strength on the macroscopic transverse mechanical properties and the damage onset are analysed. The simulation results show that: (1) The interfacial strength has a more significant effect on the transverse strength and ultimate strain than on the transverse modulus; (2) Decreasing the interfacial strength has a greater effect on the transverse modulus, strength and ultimate strain than increasing the interfacial strength; and (3) The interfacial strength can change the damage onset.

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  Cite this article

[IEEE Style]

W. Jia, L. Fang, Z. Chen, K. Zhao, H. Huang, L. Pan, "A Microscopic Cohesive Zone Model and Effects of Interface on the Transverse Mechanical Properties for Composites," Fibers and Polymers, vol. 22, no. 5, pp. 1352-1365, 2021. DOI: 10.1007/s12221-021-0150-7.

[ACM Style]

Wenbin Jia, Lei Fang, Zhi Chen, Kai Zhao, Hongmei Huang, and Lei Pan. 2021. A Microscopic Cohesive Zone Model and Effects of Interface on the Transverse Mechanical Properties for Composites. Fibers and Polymers, 22, 5, (2021), 1352-1365. DOI: 10.1007/s12221-021-0150-7.

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