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The Meso-inhomogeneous Deformation of Pure Copper under Tension–Compression Cyclic Strain Loading

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Abstract

The investigation based on experiments and crystal plasticity simulation is carried out to undertake research on meso-deformation inhomogeneity of metals under cyclic loading at grain level. Symmetrical tension–compression cycle tests are performed on pure copper specimens to observe the inhomogeneous distribution of slip deformation and its evolution with cycle number. Cyclic hardening process and stable hysteretic behavior of pure copper under cyclic loading are simulated by applying a crystal plasticity constitutive model including nonlinear kinematic hardening associated with the polycrystalline representative volume element (RVE) constructed by Voronoi tessellation. Inhomogeneous deformation processes of materials under six different strain amplitudes are simulated by 1600 cycles, respectively. We discuss the variation law of the inhomogeneous meso-deformation distribution of material with the increase in cycle number, and research the rationality of characterizing the inhomogeneous deformation distribution and variation with the statistical standard deviation of the micro-longitudinal strain or the statistical average of the first principal strain based on the statistical analysis of the inhomogeneous deformation of the polycrystalline RVE model during the cycling process. It is found that these two parameters are related to and approximately inversely proportional to the length of measuring gauge.

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Acknowledgements

This research was supported by the National Natural Science Foundation of China (Nos. 11632007 and 11472085) and the Project of Promoting the Basic Ability of Scientific Research of Young and Middle-aged Teachers in Universities of Guangxi (No. 2019KY1365), which are gratefully acknowledged.

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Correspondence to Keshi Zhang.

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Jin, L., Qin, S., Zeng, B. et al. The Meso-inhomogeneous Deformation of Pure Copper under Tension–Compression Cyclic Strain Loading. Acta Mech. Solida Sin. 33, 403–417 (2020). https://doi.org/10.1007/s10338-019-00135-1

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  • DOI: https://doi.org/10.1007/s10338-019-00135-1

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