Affiliation:
1. School of Mechanical and Instrumental Engineering, Xi’an University of Technology, Xi’an 710048, China
2. Business Intelligence and Knowledge Engineering Lab, Henan University of Technology, Zhengzhou 450001, China
Abstract
Nanoindentation is an effective nondestructive method for small scale determination of mechanical properties of materials. However, indentation response of metallic materials is very sensitive to indenter tip roundness, size effects, loading rate, and so forth. This study will analyze the effect of indenter shape imperfections on hardness determination. For this purpose, experimental investigations and finite element simulations are carried out. At first, it is found that hardness values determined with Oliver and Pharr’s method are affected by errors caused by imperfect indenter tip: errors increase for imperfect indenters with larger tip radii. Afterwards, several commonly used methods accounting at different extents for tip radius variations are compared. However, most of those methods are found not to be accurate for shallow indentation. For this reason, a novel hardness determination method based on geometrical relations of the imperfect indenter tip is developed. Results show that the new approach is very effective even in the case of shallow indentation.
Funder
National Natural Science Foundation of China
Subject
General Engineering,General Materials Science
Cited by
19 articles.
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