Method for detecting lightning stroke damage of carbon fiber composite laminated plate
A composite material layer and detection method technology, applied in the analysis of materials, material resistance, material analysis by electromagnetic means, etc., can solve the problem of not being studied in detail, and achieve the effect of reducing the cost and difficulty of the test and easy operation.
Active Publication Date: 2020-03-17
SHANGHAI JIAO TONG UNIV
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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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[0046] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.
[0047] This example consists of two parts,
[0048] The first part is: measure the front resistance, back resistance and italic resistance of carbon fiber composite laminate samples before and after lightning strikes, and obtain the change rate of front resistance, back resistance change rate and italic 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 of carbon fiber composite laminates.
[0049] The second part is: according to the actual measured front resistance change rate, back resistance change rate and italic resistance change rate, using the characteristic curve of lightning damage to deduce the type of lightning current that caused the damage, the peak current and the action integral at this time .
[0050] ...
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Abstract
The invention discloses a method for detecting lightning stroke damage of a carbon fiber composite laminated plate. The method comprises steps of measuring front resistance, back resistance and oblique resistance of a carbon fiber composite laminated plate sample before and after lightning stroke to obtain curves of the front resistance change rate, the back resistance change rate and the obliquebody resistance change rate along with a lightning current peak value and lightning current action integral change, taking the curves as characteristic curves of lightning stroke damage of the carbonfiber composite material laminated plate. In the application process, according to the measured actual front resistance change rate, the back resistance change rate and the oblique resistance change rate, a lightning current type causing the damage, the peak current and the action integral at the moment are deduced by utilizing the characteristic curves of the lightning damage. Compared with a carbon fiber composite laminate damage detection method in the prior art, the method is advantaged in that the resistance characteristic of the material is utilized, an expensive sensor is not needed, and quasi-real-time online detection can be achieved.
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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IPC IPC(8): G01N27/20
CPCG01N27/041G01N27/20
Inventor 陈坚傅正财
Owner SHANGHAI JIAO TONG UNIV