Abstract
Compared with metal materials, Carbon Fiber Reinforced Plastic (CFRP) is more excellent in performance, with high specific strength and high specific modulus. And among various CFRP structural elements, CFRP laminated plates have widespread applications. However, some indiscernible and hidden primary damage always appears on the CFRP laminated plate and will continuously evolve and expand after being loaded. This work starts with the analysis of the relationship between the changes of the strain distribution and damage expansion of CFRP laminated plates and proposes the damage recognition method of CFRP laminated plates based on strain information. Then, the CFRP laminate damage monitoring system based on Fiber Bragg Grating (FBG) sensor is established, and the CFRP laminate damage identification experiment based on FBG sensor is made to verify the accuracy of the CFRP laminate damage identification method. The results show that the maximum error between the load when the damage appears on the FBG sensor and that when the damage of CFRP laminated plates expands based on the simulated analysis does not exceed 16%. The accuracy of the damage recognition method of CFRP laminated plates is verified and the damage recognition of CFRP laminated plates and their expansion process is achieved.
Highlights
Compared with metal materials, Carbon Fiber Reinforced Plastic (CFRP) has good characteristics including high specific strength, high specific modulus, fatigue resistance, and high-temperature resistance [1,2,3,4]
The damage of CFRP and that of traditional metal and other materials are distinguished in the mechanism, so some existing damage detection and monitoring methods are unsatisfactory in the usual effect. erefore, it is very significant to recognize the damage of CFRP and their expansion. e existing common methods of the damage detection of CFRP include ultrasonic testing, radiographic testing, and acoustic emission testing [7]
(3) With the continuous increase of the tensile load, the damage which appeared in the area of the sensor to FBG1 has a certain effect on other areas. e offset of the central wavelength of sensors FBG2, FBG3, and FBG4 shows a similar change rule to the sensor FBG1 successively, which suggests that the damage appears in the areas of FBG2, FBG3, and FBG4
Summary
Carbon Fiber Reinforced Plastic (CFRP) has good characteristics including high specific strength, high specific modulus, fatigue resistance, and high-temperature resistance [1,2,3,4]. E existing common methods of the damage detection of CFRP include ultrasonic testing, radiographic testing, and acoustic emission testing [7]. The damage of CFRP and that of traditional metal and other materials are distinguished in the mechanism, so some existing damage detection and monitoring methods are unsatisfactory in the usual effect. Both ultrasonic testing and radiographic testing are static damage detection methods, which cannot detect the real-time dynamic of damage during the movement process of the structure. In the acoustic emission testing method, the damage is detected by a piezoelectric sensor to capture the elastic waves released when the deformation or breakage occurs in materials. Elastic waves are easy to introduce interference and noise due to the frequency dispersion, pattern conversion, attenuation, and interface reflection during the propagation process in the composites, and the degumming failure of piezoelectric sensor and
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