A unified brittle fracture criterion for structures with sharp V-notches under mixed mode loading

2008 ◽  
Vol 22 (7) ◽  
pp. 1269-1278 ◽  
Author(s):  
Jin Kwang Kim ◽  
Sang Bong Cho
Keyword(s):  
Brittle Fracture ◽  
Mixed Mode ◽  
Fracture Criterion ◽  
Mixed Mode Loading ◽  
Brittle Fracture Criterion

Dynamic cleavage in ductile materials

1986 ◽  
Vol 1 (1) ◽  
pp. 73-80 ◽  
Author(s):  
I.-H. Lin ◽  
R. M. Thomson
Keyword(s):  
Brittle Fracture ◽  
Mixed Mode ◽  
High Speed ◽  
Time Dependent ◽  
Mode I ◽  
Theoretical Treatment ◽  
Mixed Mode Loading ◽  
Dislocation Emission ◽  
Ductile Materials ◽  
Ductile Behavior

Ductile materials are found to sustain brittle fracture when the crack moves at high speed. This fact poses a paradox under current theories of dislocation emission, because even at high velocities, these theories predict ductile behavior. A theoretical treatment of time-dependent emission and cleavage is given which predicts a critical velocity above which cleavage can occur without emission. Estimates suggest that this velocity is in the neighborhood of the sound velocity. The paper also discusses the cleavage condition under mixed mode loading, and concludes that the cleavage condition involves solely the mode I loading, with possible sonic emission under such loadings

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