Numerical Study of Scale Effects of Ultra-Thin Nickel Beams
来源期刊：JOURNAL OF RARE EARTHS2004年增刊第2期
论文作者：Xie Shuisheng Yang Haoqiang Huang Guojie Li Lei
Key words：scale effect; MEMS; couple stress plasticity; hybrid element;
Abstract: Recent experiments have shown that metallic materials display significant size effects when the characteristic length scale of non-uniform plastic deformation is close to a micron. Couple stress plasticity has been developed to explain such phenomena by Fleck and Hutchinson. The mechanical behaviors of ultra-thin nickel beams in different boundary conditions were studied with the hybrid element developed for couple stress plasticity before. Strong scale effects are found when the beam's thickness is close to the material characteristic length scale. Such phenomena will disappear if the beam' s thickness is greatly larger than the material characteristic length scale. The scale effect is the beams inherent property and it does not change with the change of support conditions.
Xie Shuisheng1，Yang Haoqiang1，Huang Guojie1，Li Lei1
(1.General Research Institute for Non-Ferrous Metals,Beijing 100088,China)
Abstract:Recent experiments have shown that metallic materials display significant size effects when the characteristic length scale of non-uniform plastic deformation is close to a micron. Couple stress plasticity has been developed to explain such phenomena by Fleck and Hutchinson. The mechanical behaviors of ultra-thin nickel beams in different boundary conditions were studied with the hybrid element developed for couple stress plasticity before. Strong scale effects are found when the beam''s thickness is close to the material characteristic length scale. Such phenomena will disappear if the beam'' s thickness is greatly larger than the material characteristic length scale. The scale effect is the beams inherent property and it does not change with the change of support conditions.
Key words:scale effect; MEMS; couple stress plasticity; hybrid element;
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