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铁道科学与工程学报

JOURNAL OF RAILWAY SCIENCE AND ENGINEERING

Vol. 19    Special 2    September 2009

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Effect of thickness and grain size on material behavior in micro-bending
SHAN De-bin(单德彬), WANG Chun-ju(王春举), GUO Bin(郭 斌), WANG Xin-wei(汪鑫伟)

School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, China

Abstract:Micro-bending tests were performed to investigate effects of thickness and grain size on material behavior in sheet metal forming. The rolling brass C2680 foil was selected as the experimental material, and it was annealed to eliminate the work-hardening and get different grain sizes. A device was specially designed for three-point bending with two load sensors. The results show that the bending force increases with increasing the punch displacement. With the foil of same thickness, a smaller punch radius leads to a larger bending force. When the grain size increases, the bending force becomes smaller. Size effects are observed obviously. These results have been analyzed by work-hardening, Hall-Petch equation and free surface effect.

 

Key words: micro-forming; micro-bending; size effects; free surface effect

ISSN 1672-7029
CN 43-1423/U

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