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

在这项研究中，层状复合材料的塑性尺寸效应进行了分析，使用离散位错塑性方法。通过分析一个包含刃型位错的层状复合材料模型，验证了该方法的有效性。在分析中，考虑了弹性层的厚度、刚度以及弹塑性层之间的滑移面间隙等参数。结果表明，在弹性层厚度为几十nm的情况下，弹塑性层的应变硬化主要取决于弹塑性层间的滑移面间隙，而这种效应是由于相邻弹塑性层中位错堆积引起的长程应力所致。

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.