Transactions of Nanjing University of Aeronautics & Astronautics
Damage Analysis of Resin-Based Fiber Composites Under Hygrothermal Coupling and Load-Hygrothermal Coupling Environment
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Abstract:
The paper studies the damage of epoxy resin-based carbon fiber reinforced ploymer （EP-CFRP） under the coupling effects of high and low temperature， humidity， tensile load. Two high and low temperature cycle intervals （［-40─40 ℃］/［-40─25 ℃］）， two humidity conditions （soaking in water/anhydrous）， and three load levels （unstressed state/30% and 60% of the ultimate load） and their coupling effects are considered. The results indicate that all these three factors have a significant impact on the durability of EP-CFRP. The coupling effects of these factors have strong influence on the tensile strength， while affect little on the tensile modulus. The micro-cracks， which generated at the interface of the resin matrix and the fiber， have been proved to be the main reason for the strength reduction at later stage. The coupling effect of humidity and tensile load promote the expansion of cracks and exacerbates the damage to EP-CFRP. Based on the cumulative damage theory， the residual strength damage model of EP-CFRP under the three-factor coupling action of “high and low temperature cycle-humidity-load” is calibrated by nonlinear fitting method.
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Project Supported:
This work was financially supported by the Natural Science Foundation of Sichuan Province （No.2022NSFSC0317） and Key Laboratory of Icing and Anti/De-icing of Aircraft Project （No.IADL20190404）.
Clc Number:
TN925
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