Multiple Cracks in Three-Dimensional (3-D) Unidirectional Composites: Compliance and Energy Release Rates

1991 ◽  
Vol 13 (4) ◽  
pp. 257
Author(s):  
WS Johnson ◽  
JE Masters ◽  
TK O'Brien ◽  
LR Dharani ◽  
L Chai
Keyword(s):  
Energy Release ◽  
Three Dimensional ◽  
Multiple Cracks ◽  
Release Rates ◽  
Unidirectional Composites ◽  
Energy Release Rates

Estimation of Energy Release Rates and Instability Analysis for a Pipe With a Circumferential Surface Crack Subjected to Bending

1986 ◽  
Vol 108 (1) ◽  
pp. 33-40 ◽  
Author(s):  
J. Pan
Keyword(s):  
Energy Release ◽  
Surface Crack ◽  
Deformation Theory ◽  
Three Dimensional ◽  
Elastic Solid ◽  
Release Rates ◽  
Energy Release Rates ◽  
Fracture Instability ◽  
Nonlinear Elastic ◽  
Leak Before Break

An estimation of the energy release rate J for a three-dimensional nonlinear elastic solid containing a two-dimensional plane crack is presented. Special attention is focused on a pipe with a circumferential surface crack subjected to bending. The present analysis gives an estimation of the distribution of J along the crack front of a circumferential surface crack. Fracture instability of the cracked solid is also discussed. Based on the deformation theory of plasticity and a postulated criterion for crack growth, wall-breakthrough instability of the circumferential surface crack is examined. The predictions of the present analysis are in agreement with experimental observations, and indicate that a longer circumferential surface flaw is more susceptible to radial instability. Implications of this study on “leak before break” conditions are also discussed.

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