Detection method for lightning damage of carbon fiber composite laminates

Abstract

A method for detecting lightning strike damage to a carbon fiber composite laminate, the method comprising: measuring the front resistance, back resistance and italic resistance of a carbon fiber composite laminate sample before and after a lightning strike, and obtaining the change rate of the front resistance, the change rate of the back resistance and the italic resistance The curves of the resistance change rate with the peak value of lightning current and the integral change of lightning current action, these curves are used as the characteristic curves of lightning damage to carbon fiber composite laminates. In the application process, according to the measured actual front resistance change rate, back resistance change rate and italic resistance change rate, the characteristic curve of lightning damage is used to deduce the type of lightning current causing the damage, the peak current and the action integral at this time. Compared with the existing carbon fiber composite material laminate damage detection method, the present invention utilizes the resistance characteristic of the material itself, does not need expensive sensors, and can realize quasi-real-time on-line detection.

Description

technical field [0001] The invention belongs to the field of lightning strike damage detection of composite materials, and relates to a detection method for lightning strike damage of carbon fiber composite material laminated plates. Background technique [0002] Carbon fiber composite materials have the characteristics of high strength, high modulus, high temperature resistance, etc., and are ideal structural materials. Carbon fiber has good electrical conductivity, and the resistivity is about 1.2×10 -5 ~3×10 -5 Ωm. Due to the high conductivity of carbon fiber, carbon fiber can be used as a sensor to study the damage of carbon fiber composite laminates through the change of its own resistance. [0003] Carbon fiber composites are widely used in aircraft and wind turbine blades due to their outstanding properties. These applications are often attacked by lightning. Compared with other non-metallic materials, carbon fiber itself has better electrical conductivity and th...

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Problems solved by technology

The electrical resistance method has been widely used in the mechanical damage detection of carbon fiber composite materials, but because the relationship between the resistance change of carbon fiber composite laminates before and after lightning strikes and the lightning damage has not been carefully studied in the past, it has not been used. Lightning damage detection of carbon fiber composite laminates by electrical resistance method

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