Abstract
A multiscale elastoplastic damage model to predict mechanical response and fracture behavior of quasi-continuous network structured (Ti3AlC2-Al3Ti)/2024Al composites under uniaxial tension, along with the flexible program for structure reconstruction is proposed. Microscale constituents consist of dispersed in-situ Al3Ti and matrix, while the mesoscale constituents include Ti3AlC2, the matrix, and the interface. The brittle damage model is employed to degrade the stiffness of Ti3AlC2, and a modified Johnson-Cook model is applied to the matrix to accommodate the effect of grain size on the yield strength of the material. The period boundary condition is adopted to the bilinear constitutive relation in microscale analysis, and the output is calculated and transferred to mesoscale as the interface property of Ti3AlC2 and matrix. The numerical simulation results agree well with that of the corresponding quasi-static tension experiment and the deformation response of quasi-continuous network structured (Ti3AlC2-Al3Ti)/2024Al composites is discussed.
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