Article

Crack Stability of Fracture Specimens used to Test Unidirectional Fiber Reinforced Material

Experimental Mechanics (impact factor: 1.52). 05/2012; 50(4):473-482. DOI:10.1007/s11340-009-9251-8 pp.473-482

ABSTRACT The traditional compliance-based criterion of the crack stability in fracture mechanics states that the stability of the crack
propagation in the different specimens under different fracture modes is determined by the derivative of the energy release
rate with respect to the crack length. In this work the compliance-based criterion is verified by experiments performed on
fracture mechanical systems. The large number of experiments carried out on different (mode-I, mode-II, mixed-mode I/II and
mixed-mode II/III) specimens shows that the stability of the crack propagation depends on the derivative of the critical displacement
(the displacement at the point of fracture initiation) with respect to the crack length. The experimentally established limits
of crack stability were compared to the limits of the traditional criterion and it is shown that in each case they lead to
approximately the same restriction considering the stable zone of crack propagation.

KeywordsCrack stability-Unidirectional fiber reinforced material-Double-cantilever beam-End-notched flexure-Single-cantilever beam-Interlaminar fracture

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Keywords

compliance-based criterion
 
crack length
 
crack propagation
 
crack stability
 
critical displacement
 
derivative
 
different
 
different fracture modes
 
different specimens
 
displacement
 
fracture initiation
 
fracture mechanical systems
 
fracture mechanics states
 
KeywordsCrack stability-Unidirectional fiber
 
material-Double-cantilever beam-End-notched flexure-Single-cantilever beam-Interlaminar fracture
 
mixed-mode II/III
 
mode-II
 
stable zone
 
traditional compliance-based criterion
 

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