The Mode I Interlaminar Fracture Toughness
Of Carbon Fiber/epoxy Resin Composite
With Freezing After Water Absorption
Author(s)
H. Katogi & K. Takemura
Abstract
In this study, the effect of freezing after water absorption on the mode I
interlaminar fracture toughness of carbon fiber reinforced plastics (CFRP) was
investigated. Plain woven carbon fiber was used as reinforcement. Epoxy resin
was used as the matrix. A water absorption test was conducted at 90°C for up to
500 hours. After water absorption, the specimens were kept at -15°C, -79°C and
-198°C. The fracture surfaces of specimens were observed by using a scanning
electronic microscope (SEM). Double cantilever beam tests were conducted at
room temperature after water absorption and freezing. As a result, the following
conclusions were obtained. CFRP can absorb a lot of water at an elevated
temperature. At 90°C, the rate of water absorption is about 1.5%. The fracture
toughness of water-absorbed CFRP is greater than that of virgin CFRP material
in the case that the water absorbed ratio is more than 0.9%. This is because the
resin becomes ductile due to water absorption. In the case of freezing, at which
the water absorption ratio is less than 0.9%, the fracture toughness only almost
increases. However, in the case of 1.5%, the fracture toughness increases by
about 50%. This is also because of the interface between the fiber and the matrix.
Keywords: carbon fiber, epoxy resin, mode I interlaminar fracture toughness,
water absorption, freezing, SEM.
Keywords
carbon fiber, epoxy resin, mode I interlaminar fracture toughness,
water absorption, freezing, SEM.
Related Book
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