Journal
COMPOSITE STRUCTURES
Volume 135, Issue -, Pages 276-285Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.compstruct.2015.09.040
Keywords
Moisture content; Hygro effect; Penetration-resistance; CFRP composite; Impact behavior
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Funding
- Basic Science Research Program through the National Research Foundation of Korea (NRF) - Ministry of Science, ICT and future planning [NRF-2015R1A2A1A01006214]
- Construction Technology Research Project (Development of impact/blast resistant HPFRCC and evaluation technique thereof) - Ministry of Land, Infrastructure, and Transport [13SCIPS02]
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Hygro effect on the impact resistance of unidirectional (UD) CFRP composite plates under low-velocity impact loading are studied experimentally. Before the test, the UD specimens were immersed in water at 80 degrees C for moisture absorption. Through the moisture ingress into the matrix fiber interfacial region and resulting in the moisture swelling which may release the thermally induced residual compressive stresses around interfacial zone, certain degradation of disband at the interface of fiber and matrix was observed in the SEM pictures. The experimental results showed that the moisture content played a negative role by decreasing the impact resistance of composite plates. The composite plates with higher moisture level have small values of impact peak force, delamination threshold load, and initiation energy. The flexural rigidity of the unidirectional plates decreased as the moisture content increased, and the larger damage sizes were observed in wet specimens as compared to those of dry specimens. (C) 2015 Elsevier Ltd. All rights reserved.
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