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Scale-Dependent Crack Modeling for Investigation the Effect of Geometrically Necessary Dislocations in Micro/Nano Grain Size of Copper
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HomeAdvanced Engineering ForumAdvanced Engineering Forum Vol. 15Scale-Dependent Crack Modeling for Investigation...

Scale-Dependent Crack Modeling for Investigation the Effect of Geometrically Necessary Dislocations in Micro/Nano Grain Size of Copper

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Abstract:

In this study, a scale-dependent model is employed to investigate the size effects of copper on the behavior of the crack-tip. This model includes the homogeneous and non-homogeneous strain hardening based on the wavelet interpretation of size effect. Introducing additional micro/nano structural considerations together with decreasing grain size, different size effects can be obtained. As the size dependency is not taken into account in conventional plasticity, an enhanced theory which is related to the strain gradient introduces a length scale will give more realistic representations of state variables near the crack-tip. Accordingly, the contribution of geometrically necessary dislocations (GNDs) activity on strengthening and stress concentration factor is identified in the crack-tip. Finally, the affected zone which is dominated by presence of GNDs is identified

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Advanced Engineering Forum Vol. 15

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Advanced Engineering Forum (Volume 15)

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1-16

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https://doi.org/10.4028/www.scientific.net/AEF.15.1

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February 2016

Authors:

Amin Zaami*, Ali Shokuhfar

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Crack-Tip, Grain Size, Scale Dependent Plasticity, Size Effect

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