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Journal of Mechanical Science and Technology

, Volume 32, Issue 11, pp 5351–5361 | Cite as

A molecular dynamics study on the biased propagation of intergranular fracture found in copper STGB

  • Hayoung Chung
  • Maenghyo Cho
Article
  • 4 Downloads

Abstract

Structural failure of the polycrystalline material is influenced by the interaction between the crystal and their boundaries. Specifically, a ductile material such as copper exhibit the different mechanisms of failure depending on the direction of the crack propagation within the grain boundary. Such directional anisotropy is often studied based on Rice’s criteria, which has the analytic solution in the grain boundary with [110] rotation of the axis. In this work, we expand the study of such intergranular directionality to a propagation within [100] grain boundary. This work introduces the inherent bias found in the intergranular fracture of [100] grain boundaries, using molecular dynamics simulations. Later, such observation is shown to agree with the relative crack propagation velocities, and cohesive energies obtained at the crack tip vicinity. These anisotropic trends are lastly correlated with the detailed atomistic movements observed during structural failures. These findings are to be used in improving the simulation capability and predictability of crack propagation.

Keywords

Inherent directional preference Crack propagation Bicrystal Molecular dynamics Directional anisotropy 

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Copyright information

© The Korean Society of Mechanical Engineers and Springer-Verlag GmbH Germany, part of Springer Nature 2018

Authors and Affiliations

  1. 1.Department of Structural EngineeringUniversity of CaliforniaSan DiegoUSA
  2. 2.Division of Multiscale Mechanical Design, School of Mechanical and Aerospace EngineeringSeoul National UniversitySeoulKorea
  3. 3.Institute of Advanced Machines and DesignSeoul National UniversitySeoulKorea

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