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Fracture behavior of precracked nanocrystalline materials with grain size gradients

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Abstract

The fracture behavior of precracked nanocrystals with grain size gradients is simulated using the molecular dynamics method. A large grain size gradient is found to elevate resistance to crack propagation and transform the fracture mode from intergranular to intragranular when the crack is obstructed by a coarse grain. But the intragranular crack is nipped in its bud due to the difficulty of intragranular fracture. However, intergranular fractures can be always kept in nanocrystals with a small grain size gradient. Both the Schmid factors for the slip systems of grains near the crack tip and the critical stress intensity factors are calculated, and energy partitioning is conducted to analyze the mechanisms behind this phenomenon. The research exhibits the key role of grain size gradient in improving the antifracture ability of nanocrystals.

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Authors and Affiliations

  1. Department of Mechanics, Huazhong University of Science and Technology, Wuhan, 430074, People’s Republic of China

    Peng Wang, Xinhua Yang & Xiaobao Tian

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  1. Peng Wang
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  2. Xinhua Yang
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  3. Xiaobao Tian
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Correspondence to Xinhua Yang.

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Wang, P., Yang, X. & Tian, X. Fracture behavior of precracked nanocrystalline materials with grain size gradients. Journal of Materials Research 30, 709–716 (2015). https://doi.org/10.1557/jmr.2015.18

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  • DOI: https://doi.org/10.1557/jmr.2015.18

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