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1 Computer Assisted Mechanics and Engineering Sciences

1 2007

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Modelling of crystal plasticity effects on the crack initiation energies of a bi-crystal interface (Nb/Al2O3)

Siddig A., Schmauder S.

Computer Assisted Mechanics and Engineering Sciences

2007

Vol. 14, No. 1

67-78

The present paper examines the crystal orientation effects on the energy at the crack-tip of niobium/alumina joints. The analyses have been done using crystal plasticity theory. The single crystal parameters are identified for each family of slips system in [1]. These identified parameters are being used to examine the orientation effects of the niobium single crystal on the energy at the crack-tip. Differences in the fracture energy are explained based on the plastic slip (strain) induced in different slip systems during deformation. A qualitative comparison of the crystal plasticity analysis with the experiments of [2,3] is also been presented.