Carbon fiber composite material damage simulation calculation method under the action of a single lightning current component

Abstract

The invention discloses a carbon fiber composite material damage simulation calculation method under the action of a single lightning current component. The law of the change of the conductivity pyrolysis degree of the carbon fiber composite material is used as a simulation calculation condition of the model; the invention discloses a thermoelectric coupling model of a carbon fiber composite material considering resin pyrolysis. the thermal effect process in the lightning current action process is directly associated with the conductivity characteristic of the carbon fiber composite material;the relation rule among the lightning damage area, the lightning damage depth and the lightning component parameters of the carbon fiber composite material laminated plate can be accurately obtained,the lightning damage mechanism of the carbon fiber composite material and the lightning damage mechanism can be explored, and a theoretical basis can be provided for the research of the formula and the process of the carbon fiber composite material laminated plate.

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...

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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

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