Analytic Prediction of Structural Stress-Strain Relations of Microstructured Metal

Abstract:

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Nanostructured and ultra-fine grained metals have higher strength but extremely limited ductility compared to coarse grained metals. However, their ductility can be greatly improved by introducing a specific range of grain sizes in the microstructures. In the paper, multiscale unit cell approach (UCA) is developed and applied to predict the averaged stress-strain relations of the multiscale microstructure metals. The unit cell models are three-phase structured at different scale lengths of 100 nm, 1 μm and 10 μm with different volume fractions and periodic boundary conditions. The contributions of multi-scale microstructures to the macroscopic structural properties of metals are also studied using a analytic approach—two-step mean-field method (TSMF), where three microstructural parameters are introduced and thus mechanical properties such as strength and ductility are presented as a function of these parameters. For verification of these proposed numerical and theoretical algorithms, the structural properties of the pure nickel with three-grain microstructures are studied and the results from FEA and the proposed theory have good agreement.

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Periodical:

Edited by:

John Bell, Cheng Yan, Lin Ye and Liangchi Zhang

Pages:

83-86

DOI:

10.4028/www.scientific.net/AMR.32.83

Citation:

C. H. Yang et al., "Analytic Prediction of Structural Stress-Strain Relations of Microstructured Metal", Advanced Materials Research, Vol. 32, pp. 83-86, 2008

Online since:

February 2008

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$35.00

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