The interlaminar crack-tip response in a fiber-reinforced composite laminate

1994 ◽  
Vol 66 (2) ◽  
pp. 121-138 ◽  
Author(s):  
Hyung Jip Chol ◽  
S. Thangjitham
Keyword(s):  
Composite Laminate ◽  
Crack Tip ◽  
Fiber Reinforced ◽  
Fiber Reinforced Composite ◽  
Reinforced Composite ◽  
Interlaminar Crack

Damage Mechanism and Apparent Fracture Strength of Notched Fiber-Reinforced Composite Laminates

2010 ◽  
Vol 430 ◽  
pp. 53-67
Author(s):  
Shoji Kamiya ◽  
Hideki Sekine
Keyword(s):  
Fracture Strength ◽  
Upper Bound ◽  
Composite Laminates ◽  
Critical Length ◽  
Fiber Reinforced ◽  
Fiber Reinforced Composite ◽  
Reinforced Composite ◽  
Interlaminar Crack ◽  
Notch Tip ◽  
Tip Radius

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.

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