INVESTIGATION ON MECHANICAL PROPERTIES AND SIZE EFFECTS OF NANOCRYSTALLINE TWIN COPPER

Acta Metall Sin

2007, Vol. 43

Issue (12): 1245-1250 DOI:

Research Articles

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INVESTIGATION ON MECHANICAL PROPERTIES AND SIZE EFFECTS OF NANOCRYSTALLINE TWIN COPPER

Bo Wu;

中国科学院力学研究所

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Bo Wu. INVESTIGATION ON MECHANICAL PROPERTIES AND SIZE EFFECTS OF NANOCRYSTALLINE TWIN COPPER. Acta Metall Sin, 2007, 43(12): 1245-1250 .

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Abstract The stress-strain relations of nanocrystalline twin copper with different size grains and twins are studied by using FEM simulations based on the conventional theory of mechanism-based strain gradient plasticity (CMSG). The concept of twin lamellae strengthening zone is proposed in our analysis with a cohesive interface model to simulate grain-boundary sliding and separation. Roles of many material parameters affecting stress-strain curves of polycrystalline twin copper are studied in detail. Furthermore, the effects of both twin lamellar spacing and twin lamellar distribution on the stress-strain relations are investigated under tension loading. The numerical simulations show that: both the strain gradient effect and the material hardening increase with decreasing the grain size and twin lamellar spacing. The distributions of twin lamellae have a significant influence on the general mechanical properties, and the effect will become into small with decreasing the grain and twin lamellar spacing. Finally, the prediction results of FEM are compared with the data of several experiments.

Key words: strain gradient plasticity twin size effect FEM simulation

Received: 06 March 2007

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https://www.ams.org.cn/EN/ OR https://www.ams.org.cn/EN/Y2007/V43/I12/1245

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