About this Abstract |
Meeting |
2021 TMS Annual Meeting & Exhibition
|
Symposium
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Mechanical Response of Materials Investigated through Novel In-situ Experiments and Modeling
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Presentation Title |
Size Effect, Friction and Adhesion in Small-scale Cutting of Metals |
Author(s) |
Gan Feng, Parth Dave, Dinakar Sagapuram |
On-Site Speaker (Planned) |
Gan Feng |
Abstract Scope |
We present an experimental study of cutting of metals at sub-micron to nano-scales. An instrumented ultramicrotomy technique employing "ideally" sharp glass and diamond knives is developed to achieve small cutting depths (30 nm to a few um) under controlled plane-strain conditions and measure corresponding forces. A striking observation from the study is the existence of a strong size effect, manifested by multi-fold increases in the specific energy with decreasing chip size, with this effect being most prominent in soft metals. This effect has its origin in the tool-chip contact mechanics and arises due to the non-linear scaling of the contact area with the characteristic length scale. The results are interpreted from the viewpoint of adhesion theory, where surface forces play an important role in determining the contact area and friction at small scales. Implications for using cutting as a novel means to explore small-scale mechanical behavior will be discussed. |
Proceedings Inclusion? |
Planned: |