Advances in Computational Mechanics by Grant Steven, Qing Li, Zhongpu Zhang PDF

By Grant Steven, Qing Li, Zhongpu Zhang

ISBN-10: 3038350680

ISBN-13: 9783038350682

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4] Carol I, Lopez CM, Roa O. Micromechanical analysis of quasi-brittle materials using fracture-based interface elements. In International Journal for Numerical Methods in Engineering 2001; 52(1/2):193 215. [5] Ciancio D, Carol I, Castellazzi G, Optimal penalty stiffness values of concurrent 2D elastic interface elements leading to accurate stress tractions, International Journal for Numerical Methods in Engineering, NME-May-13-0315 (paper under review). [6] Hughes TJR. The finite element method : linear static and dynamic finite element analysis.

145. However, dislocation slip across GBs is thought to exhibit non-Schmid characteristics, which means that the outgoing slip direction of dislocations is not always along the slip system of maximum resolved shear stress [9]. This is due, in part, to the geometrical necessity to alter the structure of the GB in order to facilitate cross-GB slip (or “penetration”). This typically involves formation of a residual dislocation at the GB and nucleation of an entirely new dislocation along the slip system in the second crystal that results in the minimum directional deviation from the original slip direction [9].

However, in the case of Fig. 6F, relatively substantial “grooving” was observed within the GB at the top and bottom of the simulation cell. This could imply that glissile GB dislocations were formed to accommodate the strain, as opposed to stacking faults. In the next phase of this research, a full Burgers vector analysis will be carried out which could enable a clear distinction to be made between the cases of C, G, E and H and F. Substantial variability was also observed in the slip systems of nucleated dislocations from the void.

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Advances in Computational Mechanics by Grant Steven, Qing Li, Zhongpu Zhang

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