Calculation method for damage simulation of carbon fiber composites under single lightning current component

Abstract

The invention discloses a damage simulation calculation method of a carbon fiber composite material under the action of a single lightning current component. The change law of the thermal conductivity and pyrolysis degree of the carbon fiber composite material is used as the simulation calculation condition of the model. The thermoelectricity of the carbon fiber composite material considering resin pyrolysis The coupling model directly relates the thermal effect process in the process of lightning current action to the conductivity characteristics of carbon fiber composite materials, and more accurately obtains the relationship between the lightning damage area, depth and lightning component parameters of carbon fiber composite laminates, and explores the relationship between carbon fiber composite materials. The lightning damage mechanism of materials and materials provides a theoretical basis for the research on the formulation and process of carbon fiber composite laminates.

Description

technical field [0001] The invention belongs to a simulation calculation method for lightning damage of carbon fiber composite materials, in particular to a simulation calculation method for damage simulation of carbon fiber composite materials under the action of a single lightning current component. Background technique [0002] Carbon fiber composite materials not only have the characteristics of low density, high strength, high modulus, high temperature resistance, and chemical corrosion resistance, but also have the softness and processability of textile fibers. They are widely used in various fields such as aerospace, military and civil industries. With the improvement of aircraft design and the advancement of carbon fiber composite material technology, the use of carbon fiber reinforced polymer composite material CFRP (CarbonFiber Reinforced Polymers) in large civil aircraft, military aircraft, drones and stealth aircraft has continued to increase, from 1960 The amoun...

AI Technical Summary

Problems solved by technology

[0006] However, this simulation model is generally established based on the critical value of temperature or the change of impedance with the degree of pyrolysis. Before the critical temperature and critical value, the initial conditions of the thermoelectric coupling model are carbon fiber composites under the condition of static (DC) small current. The electrical conductivity of the material completely ignores the significant difference between the electrical conductivity of the carbon fiber composite material under the action of lightning current and the static small DC current, and the nonlinear characteristics of the carbon fiber composite material under the action of lightning current, so that the simulation calculation results are consistent with the actual lightning strike. There is a large difference in damage

Invention patent ZL 2015104538855 discloses the "method and device for measuring the impedance characteristics of carbon fiber composite materials under the action of non-destructive lightning current" at room temperature. The electrical conductivity under the action shows obvious nonlinear characteristics; but in different temperature environments, especially before the resin pyrolysis, the nonlinear conductivity of carbon fiber composites is related to temperature, if the resin pyrolysis in carbon fiber composites is not considered There will be a large deviation between the simulation calculation results of the carbon fiber composite material thermoelectric coupling simulation model machine and the actual lightning strike effect

Images