Theoretical development for micro-and nano-scale plasticity that takes account of long range force of dislocations and its verification

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In this study, plastic size effects of lamellar composites were analyzed using a discrete dislocation plasticity approach. The present approach was verified by analyzing a model lamellar composite including edge dislocations fixed at interfaces. In analyses, the thickness and the stiffness of elastic layers as well as the slip plane gap between elastic-plastic layers were considered as parameters. It was thus found, in the case where elastic layer's thickness is several dozen nm, that strain hardening in elastic-plastic layers depends considerably on the slip plane gap between elastic-plastic layers, and that this effect is attributed to the long range stress due to dislocation pile-ups in adjacent elastic-plastic layers.