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性别：男
学科：力学. 航空宇航科学与技术. 材料科学与工程. 机械工程. 冶金工程. 先进制造. 航空工程. 材料工程. 冶金工程. 机械工程. 固体力学
多尺度力学，宏微观力学，梯度结构材料，界面力学，固体本构关系，应变梯度理论，晶体塑性有限元，离散位错动力学，分子动力学，高熵合金，大数据与机器学习，材料基因，极端力学，高性能材料，材料的增强与增韧
2022-10-03 博士生陆宋江论文“Size effect in nanoindentation: Taylor hardening or dislocation source-limited effect?”在Materials Today Communications发表
发布时间：2022-10-03
Highlights
•The indentation size effect was investigated by 3D discrete dislocation dynamics.
•The patterns of GNDs are correlated with the dislocation motions on slip planes.
•The GND density increases as the indentation depth increases.
•The indentation size effect is caused by the limitation of dislocation sources.
Abstract
In the present work, a 3D discrete dislocation dynamics (DDD) method was used to explore the indentation size effect (ISE) in the nanoindentation of single crystals. The distribution of geometrically necessary dislocation (GND) underneath the indent obtained from the DDD simulations was compared with that in experiments. The results show that the GND density increases as the indentation depth increases, which is inconsistent with the Nix-Gao model that is usually used to interpret the ISE phenomenon. The spatial-temporal evolution of dislocation structures indicates that the available dislocation sources are limited at smaller indentation depths, thus requiring higher stress to accommodate the plastic deformation.
Link
https://doi.org/10.1016/j.mtcomm.2022.104580