Abstract
For the accurate analysis and design of microforming process, proper modeling of material behavior at the micro/mesoscale is necessary by considering the size effects. Two size effects are known to exist in metallic materials. One is the "grain size" effect, and the other is the "feature/specimen size" effect. This study investigated the feature/specimen size effect and introduced a scaling model which combined both feature/specimen and grain size effects. Predicted size effects were compared with three separate experiments obtained from previous research: a simple compression with a round specimen, a simple tension with a round specimen, and a simple tension in sheet metal. The predicted results had a very good agreement with the experiments. Quantification of the miniaturization effect has been achieved by introducing two parameters, α and β, which can be determined by the scaling parameter n, to the Hall-Petch equation. The scaling model offers a simple way to model the size effect down to length scales of a couple of grains and to extend the use of continuum plasticity theories to micro/mesolength scales.
Original language | English |
---|---|
Pages (from-to) | 470-476 |
Number of pages | 7 |
Journal | Journal of Manufacturing Science and Engineering |
Volume | 129 |
Issue number | 3 |
DOIs | |
Publication status | Published - Jun 2007 |
Externally published | Yes |
Keywords
- Microforming
- Miniaturization
- Scaling effect
- Size effect