A Method for Determining the Mechanical Erosion Rate of Carbon/Carbon Composite Materials

Abstract

The invention provides a determination method of a mechanical denudation rate of a carbon / carbon composite material. The determination method comprises the following steps: (1) combining utilizing a fiber ablation typical shape with and flow field parameters to obtain a result of fiber force analysis; (2) combiningutilizing the fiber force analysis result, a fiber strength and fracture criterion by utilizing a fiber force analysis result to obtain critical fracture height of fibers; (3) combining an evolution law of a fiber shape and analyzing the denudation frequency of the fibers by using an evolution law of a fiber shape; (4) realizing the calculation of the volume denudation rate of the single fiber by utilizing the critical fracture height and denudation frequency of the fibers; (5) calculating a denudation factor of the single fiber according to the volume denudation rate of the single fiber; (6) calculating the denudation factor of the material by combining utilizing the denudation factor of the single fiber with the volume fraction of the fibers in the material.

Description

technical field [0001] The invention relates to a method for determining the mechanical erosion rate of a carbon / carbon composite material, belonging to the field of material heat resistance analysis. Background technique [0002] Carbon / carbon composite material is a composite material with carbon fiber reinforced carbon matrix. It was accidentally obtained by the US Air Force Materials Laboratory in the 1960s. Due to its special structure and performance, it has been developed rapidly. It is currently the most advanced ablation and heat protection Material. [0003] Carbon / carbon composite materials achieve heat protection effect by sacrificing part of the quality of the material. Carbon oxidation, carbon nitrogen reaction, carbon sublimation and mechanical erosion under high pressure are the main sources of mass loss. The ablation of carbon / carbon composite materials , Accurate prediction of erosion mass loss is of great significance for heat protection design of materia...

AI Technical Summary

Problems solved by technology

[0004] At present, there are relatively mature prediction methods for the ablation prediction of carbon / carbon composite materials, but most of them are macroscopic parameter correction methods based on experimental data fitting of mechanical erosion factors. The difference prediction has the problem of insufficient universality. At the same time, the traditional macroscopic parameter correction method cannot reflect the progressive ablation behavior of the material at the mesoscale, and it is still difficult to predict the ablation performance, especially for the mesoscale ablation of the material under high pressure environment. There is still a lack of reliable prediction methods for mechanical erosion phenomena, etc.

Images