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Investigation of Brinell Indentation Diameter From Confocal Microscope Measurement and FEA Modeling

Published

Author(s)

Li Ma, Samuel Low, J J. Song

Abstract

Significant measurement differences have been continually observed worldwide in the Brinell hardness tests, even in the secondary calibration laboratories that calibrate test block reference standards. The main cause of this problem is due to the edge of the indentation that is not a distinct boundary, but is instead a curved surface with either material pile-up or sink-in, due to the plastic flow of the material surrounding the ball indenter. This makes a clear determination of the measured indentation diameter difficult. In this research, Brinell hardness indentations were made using various test forces and indenter ball sizes. Using a confocal microscope at the National Institute of Standards and Technology's surface and microform calibration laboratory, the indentations were measured in three dimensions, from which the indentation profiles were determined Additionally, finite element analysis (FEA) models were developed for investigating the indentation contact diameter for indentation impressions with pile-up edges, depending on indentation force and ball indenter force-diameter ration. From both microscope measurements and FEA simulations, deviation of measured indentation diameter from the real contact diameter was accurately determined for each indentation.
Proceedings Title
Proceedings of Hardiness Measurements Theory and Application in Laboratories and Industries| 2007 |HARDMEKO
Conference Dates
November 19-21, 2007
Conference Location
Tsukuba, 1, JA
Conference Title
HARDMEKO Hardiness Measurements Theory and Application in Laboratories and Industries

Keywords

B rinell hardness, finite element analysis (FEA) modeling, pile-up

Citation

Ma, L. , Low, S. and Song, J. (2007), Investigation of Brinell Indentation Diameter From Confocal Microscope Measurement and FEA Modeling, Proceedings of Hardiness Measurements Theory and Application in Laboratories and Industries| 2007 |HARDMEKO, Tsukuba, 1, JA (Accessed April 23, 2024)
Created November 18, 2007, Updated October 12, 2021