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The size effect in strength and fracture toughness of deformation origin submicro- and nanomaterials.

Katya M. Borysovska 1,  Viktor N. Slyunyayev 1,  Yuriy M. Podrezov 1,  Zbigniew Pakiela 2,  Krzysztof J. Kurzydlowski 2

1. Institute for Problems of Materials Science, National Academy of Sciences of Ukraine, Krzizanovsky, Kyiv 38(044), Ukraine
2. Warsaw University of Technology, Faculty of Materials Science and Engineering (InMat), Wołoska 141, Warszawa 02-507, Poland

Abstract

The effect of dislocation wall availability and of dislocation wall-crack tip distance on the crack tip dislocation emission is simulated. The detailed analysis of the system with an account of the image forces is carried out.
The calculation results allow the influence of dislocation-wall-shielding effect on crack tip stress intensity factor as well as on total energy of the system to be evaluated.
It was shown that dislocation wall results in redistribution of dislocations ahead of crack tip. This gives rise to decrease of crack tip stress intensity factor and total energy of the system.

 

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Presentation: poster at E-MRS Fall Meeting 2005, Symposium F, by Katya M. Borysovska
See On-line Journal of E-MRS Fall Meeting 2005

Submitted: 2005-05-20 12:28
Revised:   2009-06-07 00:44