1. Role of stress triaxiality on ductile versus brittle fracture in pre-cracked FCC single crystals: an atomistic study
- Author
-
Dhiraj K. Mahajan and Rajwinder Singh
- 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 - 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 .
- Published
- 2019