Modeling of The Size Effects on The Behavior of Metals in Microscale Deformation Processes  

Oleh:

Kim, Gap-Yong ; Koc, Muammer ; Jun, Ni

Jenis: Article from Journal - ilmiah internasional
Dalam koleksi: Journal of Manufacturing Science and Engineering vol. 129 no. 3 (Jun. 2007), page 470-476.
Topik: BEHAVIOUR; modeling; size effects; behaviour; metals; microscale deformation

Ketersediaan

Perpustakaan Pusat (Semanggi) Nomor Panggil: JJ93.10 Non-tandon: 1 (dapat dipinjam: 0) Tandon: tidak ada

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Isi artikel

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, and , 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.

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