Indentation Plastometry of Very Hard Metals
Publication Date
2022Journal Title
Advanced Engineering Materials
ISSN
1438-1656
Publisher
Wiley
Language
en
Type
Article
This Version
AO
VoR
Metadata
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Campbell, J., Gaiser-Porter, M., Gu, W., Ooi, S., Burley, M., Dean, J., & Clyne, T. (2022). Indentation Plastometry of Very Hard Metals. Advanced Engineering Materials https://doi.org/10.1002/adem.202101398
Abstract
This investigation concerns the application of profilometry‐based indentation plastometry (PIP) to metals with very high hardness, i.e., those with yield stresses of 1.5–3 GPa. The PIP procedure comprises (a) applying a force to an indenter ball, penetrating the sample to a preselected depth, (b) measuring the profile of the indent, and (c) iteratively running a finite element method (FEM) model to obtain the true stress–true strain curve giving optimal agreement between measured and modeled profiles. The procedure is no different when the sample is very hard, although the ball must remain elastic during the process. It is shown that this can be achieved using silicon nitride balls. These can fracture under some conditions, but it is shown that a “proof‐testing” operation can be used to ensure that any particular ball will remain elastic under the complete range of service conditions. It is also shown, via systematic comparisons with the outcomes of uniaxial (tensile and compressive) tests, that reliable stress–strain curves can be obtained for very hard metals. Furthermore, PIP testing has advantages over uniaxial testing for obtaining information about their behavior at relatively high strains (≈15%), as well as being much easier and simpler to implement.
Keywords
Research Article, Research Articles, finite element method, indentation, plastometry
Sponsorship
Engineering and Physical Sciences Research Council (EP/I038691/1)
Identifiers
adem202101398
External DOI: https://doi.org/10.1002/adem.202101398
This record's URL: https://www.repository.cam.ac.uk/handle/1810/333710
Rights
Licence:
http://creativecommons.org/licenses/by/4.0/
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