Microscratch of copper by a Rockwell C diamond indenter under a constant load
The scratch test is used for quality control mostly in phenomenological ways, and whether fracture toughness can be obtained from this test is still a matter of debate requiring further elucidation. In this paper, values of the fracture toughness of copper obtained by d...
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| Format: | Article |
| Language: | English |
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AIP Publishing LLC
2021-09-01
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| Series: | Nanotechnology and Precision Engineering |
| Online Access: | http://dx.doi.org/10.1063/10.0005065 |
| Summary: | The scratch test is used for quality control mostly in phenomenological ways, and whether
fracture toughness can be obtained from this test is still a matter of debate requiring
further elucidation. In this paper, values of the fracture toughness of copper obtained by
different scratch-based approaches are compared in order to examine the applicability of
scratch-based methodologies to characterize the fracture toughness of soft metals. The
scratch response of copper to a Rockwell C diamond indenter is studied under a constant
normal load condition. The variations of penetration depth, residual depth, and residual
scratch width with applied normal load are quantified from spherical to sphero-conical
contact regimes by piecewise functions. A newly proposed size effect law is found to be
the most suitable for scratch-based approaches to characterizing the fracture toughness of
soft metallic materials with significant plasticity. A simple expression relating the
nominal stress to the penetration depth is proposed for the spherical contact regime and
gives almost the same value of fracture toughness. The residual scratch width provides
useful information on pile-up of material and on the spherical tip radius of the indenter.
It is found that the values of the fracture toughness obtained from the microscratch test
are influenced by the data range for analysis. |
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| ISSN: | 2589-5540 |