unstable crack growth
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Rate-Dependent Cohesive Zone Modeling of Unstable Crack Growth in an Epoxy Adhesive

2009 ◽  
Vol 16 (1) ◽  
pp. 12-19 ◽  
Author(s):  
Dhaval P. Makhecha ◽  
Rakesh K. Kapania ◽  
Eric R. Johnson ◽  
David A. Dillard ◽  
George C. Jacob ◽  
...  
Keyword(s):  
Crack Growth ◽  
Cohesive Zone ◽  
Epoxy Adhesive ◽  
Cohesive Zone Modeling ◽  
Unstable Crack ◽  
Unstable Crack Growth ◽  
Rate Dependent ◽  
Zone Modeling

Analysis of Crack Growth Conditions in WWER Internals Undergone High Neutron Irradiation

2009 ◽  
Author(s):  
B. Z. Margolin ◽  
V. N. Fomenko ◽  
A. A. Sorokin
Keyword(s):  
Crack Growth ◽  
Large Scale ◽  
Plastic Zone Size ◽  
Growth Conditions ◽  
Small Scale ◽  
Unstable Crack ◽  
Unstable Crack Growth ◽  
Strain Fracture ◽  
Scale Yielding ◽  
Jr Curves

Conditions of stable and unstable crack growth by the mechanism of ductile fracture under quasi-static loading are analyzed. Simulation of crack growth by the finite element method (FEM) based on the strain fracture criterion was carried out. The effect of ratio of an elementary crack extension size to a plastic zone size on the kind of JR-curves is investigated. Based on these investigations conditions are determined under which unstable crack growth is possible for small scale and large scale yielding. The criterion is formulated for the absence of unstable crack growth in highly irradiated austenitic materials including the situation when the Feγ→Feα transition happens.

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