Atomistic study of three-dimensional fracture and deformation
- Los Alamos National Lab., NM (United States)
Fracture behavior of metals and intermetallics is closely related to cracks, dislocations, and their interactions. However, cracks and dislocations are intrinsically three-dimensional (3D) defects and their core regions must be characterized with atomistic simulations. With the advance of computer power, the full dynamical and atomistic nature of this problem can be revealed. In this talk, the authors will report two studies in a f.c.c. single crystal with 3D molecular dynamics simulations with up to 35 million atoms: (1) 3D fracture and (2) intersection of two dislocations. The authors observed a variety of dislocation emission modes in a sample that was sufficiently thick that they could be sure that the results did not depend on the thickness. The sequence of dislocation emission in the crack blunting process strongly depends on the crystallographic orientation of the crack front and differs strikingly from anything previously conjectured. This finding is essential to make more quantitative an intrinsic ductility (i.e., dislocation emission) criterion. More detailed results on this ongoing work will be reported in the meeting.
- OSTI ID:
- 293122
- Report Number(s):
- CONF-970980--; ISBN 0-87339-381-3
- Country of Publication:
- United States
- Language:
- English
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