Brittle fracture of U-notched graphite plates under mixed mode loading

2012 ◽  
Vol 41 ◽  
pp. 421-432 ◽  
Author(s):  
F. Berto ◽  
P. Lazzarin ◽  
C. Marangon
Keyword(s):  
Brittle Fracture ◽  
Mixed Mode ◽  
Mixed Mode Loading

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

scholarly journals Study on Fracture Modeling to Predict Brittle Fracture Resistance under Mixed Mode Loading

2018 ◽  
Vol 36 (4) ◽  
pp. 274-284
Author(s):  
Kazuma SHIMIZU ◽  
Hiroto SHOJI ◽  
Taichiro KATO ◽  
Hiroyasu TANIGAWA ◽  
Mitsuru OHATA
Keyword(s):  
Brittle Fracture ◽  
Fracture Resistance ◽  
Mixed Mode ◽  
Mixed Mode Loading ◽  
Brittle Fracture Resistance ◽  
Fracture Modeling

An atomistic study of brittle fracture: Toward explicit failure criteria from atomistic modeling

1995 ◽  
Vol 10 (11) ◽  
pp. 2897-2907 ◽  
Author(s):  
Peter Gumbsch
Keyword(s):  
Brittle Fracture ◽  
Mixed Mode ◽  
Failure Modes ◽  
Crack Tip ◽  
Energy Criterion ◽  
Failure Criteria ◽  
Mechanical Analysis ◽  
Coupling Scheme ◽  
Mixed Mode Loading ◽  
Stress Criterion

Atomistic techniques are used to study brittle fracture under opening mode and mixed mode loading conditions. The influence of the discreteness of the lattice and of the lattice-trapping effect on crack propagation is studied using an embedded atom potential for nickel to describe the crack tip. The recently developed FEAt (Finite Element-Atomistic) coupling scheme provides the atomistic core region with realistic boundary conditions. Several crystallographically distinct crack-tip configurations are studied and commonly reveal that brittle cracks under general mixed mode loading situations follow an energy criterion (G-criterion) rather than an opening-stress criterion (Kl-criterion). However, if there are two competing failure modes, they seem to unload each other, which leads to an increase in lattice trapping. Blunted crack tips are studied in the last part of the paper and are compared to the atomically sharp cracks. Depending on the shape of the blunted crack tip, the observed failure modes differ significantly and can drastically disagree with what one would anticipate from a continuum mechanical analysis.

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