The generated UC was analyzed with six different loading cases, where there was only one nonzero stress component in each case, to predict the material behavior of the fiber tow. The UC was meshed with 41,150 linear hexahedral elements (C3D8R). The element size was obtained after a mesh convergence analysis. The displacement-based PBC described in the previous section was adopted to define the boundary conditions for the UC. Then, the average stress and strain of the UC were calculated to obtain the effective material properties of the impregnated fiber tow, assuming that material properties of a heterogeneous material can be represented by the effective properties of an equivalent homogenous one [25].
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The mechanical response of the weft-knitted fabric composite has been analyzed as a function of the fiber tow/matrix interface. Figure 8 shows the influence of the fiber tow/matrix interface on the mechanical behavior of the composite loaded in the wale direction using four different types of interfaces. In the tie interface, there is no debonding since fiber tows and matrix surfaces are constrained to each other. However, failure can occur at the fiber tow/matrix interface during loading in the case of the cohesive interface. The two other studies, frictional and frictionless Interfaces, are designed to evaluate the effects of considering friction between fiber tow and matrix surfaces after debonding on the mechanical response of the RVE. In the frictional interface, the interaction between the fiber tow and matrix is modeled as hard contact with frictional tangential behavior, whereas friction is neglected in the frictionless interface. 2ff7e9595c
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