Simulation and Discussion on the Decreasing Flow Stress Scale Effect

The miniaturization of products requires the mass production of microparts. The microforming can well meet this requirement. Due to the emergence of decreasing flow stress scale effect in the micro scale, the traditional forming process and theory may fail. Based on the crystal plasticity theory, up...

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Bibliographic Details
Published in:Shanghai jiao tong da xue xue bao 2012-06, Vol.17 (3), p.306-311
Main Author: 申昱 于沪平 董湘怀 郭斌 单德彬 李澍
Format: Article
Language:English
Subjects:
Architecture
Billets
Computer Science
Crystal structure
Electrical Engineering
Engineering
Flow stress
Grain size
Life Sciences
Materials Science
Plasticity
Scale effect
Simulation
Yield strength
大规模生产
尺度效应
微观尺度
晶体塑性理论
晶粒尺寸
流动应力
理论模拟
规模效应
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Summary:The miniaturization of products requires the mass production of microparts. The microforming can well meet this requirement. Due to the emergence of decreasing flow stress scale effect in the micro scale, the traditional forming process and theory may fail. Based on the crystal plasticity theory, upsetting tests of micro copper cylinders with different dimensions and grain sizes were simulated, and the decreasing flow stress scale effect was studied and discussed. Results show that with the decrease of billet dimensions, the flow stress is gradually decreased, and the decreasing flow stress scale effect is emerged; with the increase of grain size, the decreasing flow stress scale effect is more remarkable. It can also be seen that the decreasing flow stress scale effect can be well simulated with the crystal plasticity theory, and the necessary relevant information is provided for deeper understanding on this scale effect, as well as the design of processes and die structures in the microforming.
ISSN:1007-1172
1995-8188
DOI:10.1007/s12204-012-1274-0