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Original Articles

A three-dimensional dislocation field crystal plasticity approach applied to miniaturized structures

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Pages 1361-1378 | Received 01 May 2006, Accepted 18 Aug 2006, Published online: 04 Dec 2010
 

Abstract

Material size effects are predicted for idealized planar micromanufactured structures, as a consequence of the competitive contributions of strain gradient strengthening and loss of microstructural constraints with diminishing dimensions, assuming a constant grain size. Simulations are carried out using a three-dimensional strain gradient crystal plasticity model which intrinsically accounts for the influence of differently oriented crystals within the material. By distinguishing between different crystallographic slip boundary conditions, the influences of surface layer passivity, internal grain boundaries and back stresses are assessed under externally applied in-plane tension and through-thickness bending loading conditions. Analyses are carried out on samples with a size that is representative of micromanufacturing processes. The simulations reveal a competitive process between first-order constraints, generally inducing a weakening behaviour as the number of grains decreases, and second-order strengthening resulting from the strain gradients.

Acknowledgements

This work was supported by the Netherlands Institute for Metals Research (NIMR) under project MC2_01096.

Notes

¶Now at Defence Research Development Canada.

Additional information

Notes on contributors

C. J. BayleyFootnote

¶Now at Defence Research Development Canada.

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