Fluid-solid coupling response calculation method for ceramic matrix composite

Abstract

The invention provides a fluid-solid coupling response calculation method for ceramic matrix composite. The fluid-solid coupling response calculation method comprises the steps: calculating a CMCs unit cell model loading and unloading stress-strain hysteresis curve through a multi-scale method; calculating an obtained loading and unloading hysteresis loop through a unit cell model, interpolating any loading and unloading hysteresis loop response, and using the response as an agent model for fluid-solid coupling solid domain dynamics calculation; on the fluid-solid coupling interface, calculating the fluid load through CFD, writing a program to read the fluid load and map the fluid load to the solid node, reading the displacement of the solid node and mapping the displacement to the fluid node, wherein the same time step length is adopted for the fluid domain and the solid domain. According to the fluid-solid coupling response calculation method, the calculation of the CMCs fluid-solidcoupling response is realized, and the variable stiffness and hysteresis behavior description under CMCs loading and unloading is simple and easy to realize; and the robustness of kinetic solution isgood, and divergence is not easy to occur.

Description

technical field [0001] The invention belongs to the field of fluid-solid coupling response calculation of braided ceramic matrix composites (ceramic matrix composites, CMCs), and in particular relates to a fluid-solid coupling response calculation method of ceramic matrix composites. Background technique [0002] Braided CMCs have the advantages of high specific strength, high specific modulus, and corrosion resistance at high temperatures, and are ideal materials for manufacturing high-temperature structures. When CMCs are loaded, due to the brittleness of the ceramic matrix, the material will produce cracks when the strain is small, so CMCs are usually in the nonlinear segment in engineering applications. During the vibration process, CMCs are under the condition of continuous loading and unloading, which will present complex variable stiffness and hysteresis phenomena. In addition, the service environment of CMCs structures is usually accompanied by fluid-structure inter...

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Problems solved by technology

[0005] It can be seen that the current fluid-solid coupling calculation of CMCs still faces the following problems: (1) the solid domain lacks an efficient constitutive model that can describe the variable stiffness and hysteresis behavior of materials; (2) the solution of dynamic equations in the solid domain considering the variable stiffness and hysteresis behavior of materials question

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