539.3 Finite-element modeling of thermal stresses in composite structures with thermal decomposition under aerodynamic heating

Dimitrienko Y. I. (Bauman Moscow State Technical University), Koryakov M. N. (Bauman Moscow State Technical University), Yurin Y. V. (Bauman Moscow State Technical University), Zakharov A. A. (Bauman Moscow State Technical University)

CONJUGATE PROBLEMS, AERO-THERMOMECHANICS, HEAT AND MASS TRANSFER, THERMAL DESTRUCTION, THERMOMECHANICS, COMPOSITE MATERIALS, THERMAL DEFORMATION, PORE PRESSURE, THERMAL STRESSES, FINITE ELEMENT METHOD


doi: 10.18698/2309-3684-2019-2-1534


The coupled task of aero-thermo-mechanics of heat-loaded structures from thermally destructive polymer composite materials under the influence of an intense aerodynamic flow is considered. The mathematical formulation of the conjugate problem is formulated and algorithms for the numerical solution of this problem are proposed. The algorithms are based on an iterative solution of three types of problems: aerodynamics, internal heat and mass transfer, and thermomechanics of the modeling aircraft structure. An example of a numerical solution to the problem for an aircraft structural element in the form of a blunt cone is presented. It is shown that the effect of high temperatures of aerodynamic heating of the structure leads to thermal degradation of the polymer composite material, which results in the generation of a large amount of gases in the pores and thermo-chemical shrinkage, which under certain conditions can lead to premature destruction of the heat-loaded composite structure.


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