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

다국어 초록 (Multilingual Abstract)

The carbon fiber/epoxy matrix interface plays an important role in the behavior and damage onset of unidirectionalfiber reinforced epoxy matrix composites and accurate modeling techniques are needed to study the effects of this complexregion on the composite response. In this work, a microscopic cohesive zone model (MCZM) based on atomic potentialenergy is established for the interface. A multiscale analysis method is proposed for predicting the transverse mechanicalproperties of unidirectional fiber composites: (1) At the microscale, MCZM is established for the interface; (2) At themesoscale, a unit cell model is established for the fiber, matrix and interface; and (3) At the macroscale, the homogenizationmethod, 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 multiscaleanalysis method. A comparison between the simulations and experiments shows that: (1) The maximum errors of thepredicted transverse modulus and transverse strength are -4.45 % and -1.28 %, respectively; and (2) MCZM can reflect thenonlinearity of epoxy matrix composite materials. Moreover, the effects of the interfacial strength on the macroscopictransverse mechanical properties and the damage onset are analysed. The simulation results show that: (1) The interfacialstrength 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 increasingthe interfacial strength; and (3) The interfacial strength can change the damage onset.

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