Coupled effect of crystallographic orientation and indenter geometry on nanoindentation of single crystalline copper

• Published in: International journal of mechanical sciences Vol. 148; pp. 531 - 539
• Main Authors: Wang, Zhanfeng, Zhang, Junjie, Hassan, Hamad ul, Zhang, Jianguo, Yan, Yongda, Hartmaier, Alexander, Sun, Tao
• Format: Journal Article
• Language: English
• Published: Elsevier Ltd 01-11-2018
• Subjects: Crystal plasticity finite element method; Indenter geometry; Nanoindentation; Single crystalline copper; Surface pile-up; Crystal plasticity finite element method; Indenter geometry; Single crystalline copper; Nanoindentation; Surface pile-up
• ISSN: 0020-7403; 1879-2162
• DOI: 10.1016/j.ijmecsci.2018.09.007

•CPFEM simulation data of Berkovich nanoindentation quantitatively agrees with experimental results.•A coupled effect of crystallographic orientation and indenter geometry is revealed and analyzed.•A pile-up density factor is proposed to qualitatively characterize pile-up deformation behavior.
Surface pile-up topography is very significant for property extraction in nanoindentation tests. In the present work, we perform crystal plasticity finite element simulations of Berkovich nanoindentation of single crystalline copper with different crystallographic orientations, which derive quantitatively comparable mechanical properties and surface pile-up topographies with experimental data. Simulation results demonstrate that there is a coupled effect of crystallographic orientation of indented material and indenter geometry on surface pile-up behavior, due to the interaction between intrinsic dislocation slip events and extrinsic discrete stress distribution patterns. Based on the relative spatial orientation between crystallographic orientation of indented material and indenter geometry, a surface pile-up density factor mp is proposed to qualitatively characterize the propensity of surface pile-up behavior in nanoindentation tests of single crystalline copper.
CPFEM simulations and experiments of Berkovich nanoindentation tests reveal that the relative spatial orientation between crystallographic orientation of indented material and indenter geometry results into the modification of activated slip system-dominated surface pile-up pattern. [Display omitted]