4.5 Article

Strain-gradient dependent fatigue behavior of micron-thick copper single crystal foils

Journal

COMPUTATIONAL MATERIALS SCIENCE
Volume 85, Issue -, Pages 223-229

Publisher

ELSEVIER SCIENCE BV
DOI: 10.1016/j.commatsci.2014.01.004

Keywords

Fatigue; Cyclic deformation; Dislocation; Simulation; Strain gradient

Funding

  1. National Natural Science Foundation of China [51171045, 51371180]
  2. National Basic Research Program of China [2010CB631003]
  3. NSFC [51071158]

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The experimental observations on dislocation structures in the micron-thick cantilever beam-type samples of copper single crystals subjected to symmetrically-reversed bending load and the theoretical simulations using the modified reaction-diffusion model were conducted. It was found that strain-gradient introduced by inhomogeneous deformation has a strong influence on dislocation patterning behavior, cyclic deformation response and fatigue life of the micron-thick copper single crystal beams. The simulation results provide a deep insight into the effects of the geometrical scale and the strain gradient on fatigue behaviors in micron-thick metal foils subjected to symmetrically-reversed bending load. (C) 2014 Elsevier B.V. All rights reserved.

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