Movement of dislocations through a random array of weak obstacles of finite width
The movement of a dislocation through a random array of weak obstacles of finite width has been simulated with the aid of a digital computer. Through a normalization of the equation of motion it is shown that in the absence of inertial effects the flow stress is a function of a single parameter eta/sub 0/ = (y/sub 0//l/sub s/)..sqrt..(2 GAMMA/F/sub y/), where y/sub 0/ is the range of the dislocation-obstacle interaction force in the direction perpendicular to the dislocation, l/sub s/ is the average distance between obstacles, F/sub y/ is the strength of the interaction force, and GAMMA is the dislocation line tension. The calculations suggest a relation of the form sigma = A (1 + eta/sub 0/B)/sup /sup 1///sub 3// for the flow stress, where A and B are constants.
- Research Organization:
- Argonne National Lab., Ill. (USA)
- DOE Contract Number:
- W-31-109-ENG-38
- OSTI ID:
- 7263080
- Report Number(s):
- CONF-760421-7; TRN: 76-021620
- Resource Relation:
- Conference: Conference on computer simulation for materials applications, Gaithersburg, MD, USA, 19 Apr 1976
- Country of Publication:
- United States
- Language:
- English
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