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Role of stress triaxiality on ductile versus brittle fracture in pre-cracked FCC single crystals: an atomistic study
- Source :
- Modelling and Simulation in Materials Science and Engineering. 27:055007
- Publication Year :
- 2019
- Publisher :
- IOP Publishing, 2019.
-
Abstract
- The ductile versus brittle fracture in crystalline materials depends on the relative values of K Ic and K Ie as defined by well-known Rice theory, where K Ic and K Ie are the critical values of stress intensity factor corresponding to cleavage and dislocation emission, respectively. For K Ic < K Ie , the brittle fracture (or cleavage) takes place in atomically sharp pre-cracked crystal subjected to Mode I loading. For K Ie < K IC , the dislocations are emitted from the crack front resulting in ductile fracture. To this end, molecular static simulations are used to explain the crystal orientation dependent fracture behaviour of FCC single crystal and its contradiction with respect to Rice theory based on stress triaxiality at the crack front. The stress triaxiality at crack front changes with crystal orientation due to transformation of stiffness tensor C ijkl . It is shown that high stress triaxiality suppressed the dislocation initiation leading to cleavage failure even for the case when K Ie < K Ic .
- Subjects :
- 010302 applied physics
Materials science
Crystal orientation
Cleavage (crystal)
02 engineering and technology
021001 nanoscience & nanotechnology
Condensed Matter Physics
01 natural sciences
Computer Science Applications
Crystal
Mechanics of Materials
Modeling and Simulation
0103 physical sciences
General Materials Science
Dislocation
Composite material
0210 nano-technology
Single crystal
Stress intensity factor
Brittle fracture
Stiffness matrix
Subjects
Details
- ISSN :
- 1361651X and 09650393
- Volume :
- 27
- Database :
- OpenAIRE
- Journal :
- Modelling and Simulation in Materials Science and Engineering
- Accession number :
- edsair.doi...........c40efa90e28218871f207a4748958840