首页|Damage Mechanism and Apparent Fracture Strength of Notched Fiber-Reinforced Composite Laminates
Damage Mechanism and Apparent Fracture Strength of Notched Fiber-Reinforced Composite Laminates
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Trans Tech Publications Ltd
Apparent fracture strength of notched fiber-reinforced composite laminates depends on the notch tip radius even if it is evaluated in terms of the local parameters such as the stresses at a notch tip or the stress intensity factors. Although numbers of phenomenological explanations have been made, this phenomenon has not yet been physically clear enough. In order to elucidate its key mechanism, our interest is here focused on the interlaminar crack extension from a notch tip in cross-ply laminates subjected to mode-I loading. We find a stochastically expected upper bound of interlaminar crack length due to the probabilistic breakage process of fibers in load-bearing laminas inside the delaminated zone. This upper bound, i.e., the critical length of interlaminar crack, is inherent to the laminate and corresponds to its notched strength. The well-known variation in apparent fracture strength of notched fiber-reinforced composite laminates with respect to the notch tip radius is clearly explained as the scale effect of this constant critical length in different displacement distributions ahead of notch tips of different radii.
fracture strengthnotched fiber-reinforced composite laminatenotch tip radiusinterlaminar crack extensionfiber breakagecritical length of interlaminar crack
S. Kamiya、H. Sekine
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Nagoya Institute of Technology, Gokiso-cho, Showa-ku, Nagoya 466-8555, Japan
Tohoku University, 6-6-01 Aoba-yama, Aoba-ku, Sendai 980-8579, Japan
NETL
NSTL
Trans Tech Publications Ltd
