期刊
EXTREME MECHANICS LETTERS
卷 49, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.eml.2021.101503
关键词
Additive manufacturing; Nanoindentation; Strain gradient plasticity; Finite element; Size effect
资金
- Office of Naval Research under the Agile ICME Toolkit project [N00014-18-1-2784, N0001420WX00405]
- Office of Naval Research through the Naval Research Laboratory's core funding
This study investigates the nanoindentation behavior of additively manufactured stainless steel materials through gradient plasticity finite element simulations, revealing size dependence of indentation hardness and strengthening effects due to the interplay of characteristic length scales.
Nanoindentation can be used to probe the mechanical behavior of additively manufactured materials, but requires a fundamental understanding of inhomogeneous deformation and size effects at the various length scales involved. Here we perform gradient plasticity finite element (GPFE) simulations of nanoindentation of additively manufactured stainless steel layers on stainless steel baseplates. The GPFE simulation results, when compared with their experimental nanoindentation counterparts, capture the size dependence of indentation hardness arising from strong plastic strain gradients developed at small indentation depths. Furthermore, they address the strengthening effects due to the interplay of several characteristic length scales involved, including the indentation depth, the grain size, and the size of printing-induced dislocation cells. This work demonstrates that GPFE simulations can be effectively applied for quantitative evaluation and mechanistic understanding of the nanoindentation behavior of additively manufactured materials. (C) 2021 Elsevier Ltd. All rights reserved.
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