539.3 Structural multiscale model of elastic composites with thermal decomposition
Dimitrienko Y. I. (Bauman Moscow State Technical University), Yurin Y. V. (Bauman Moscow State Technical University), Koryakov M. N. (Bauman Moscow State Technical University), Maremshaova A. A. (Bauman Moscow State Technical University)
THERMAL DEGRADATION, COMPOSITES, PERIODICITY CELL, FEM, HIGH TEMPERATURES, MANIPULA/SMCM
doi: 10.18698/2309-3684-2025-2-1936
A structural multiscale model composite materials with thermal decomposition at high temperatures is proposed, which allows predicting the thermoelastic properties of the composite based on the properties of the initial components - the matrix phases and the monofilament phases. The model takes into account the kinetics of phase transformations in the matrix and monofilaments occurring in them at high temperatures, which allows describing the effects of the dependence of the composite properties not only on temperature, but also on the heating rate and heating history. The proposed model consists of 4 structural levels, the lower level contains the matrix and monofilament phases, and the upper level contains the periodicity cell formed by the monofilament threads and the matrix surrounding them. For each structural level, a periodicity cell is introduced. For the lower levels, approximate analytical solutions of problems on periodicity cells, proposed earlier in the works of Yu. I. Dimitrienko, are used, and for the periodicity cell of the upper level, a 3D finite element solution of the local problem is constructed. A multiscale model of thermally degradable composites is implemented in the Manipula/SMCM software package developed at the SIMPLEX Research and Education Center of Bauman Moscow State Technical University. A numerical example of calculating the elastic properties of a fabric glass epoxy composite when heated to high temperatures is given.
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