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Anelasticity in thin-shell nanolattices.

I-Te Chen1, Felipe Robles Poblete2, Abhijeet Bagal2

  • 1Walker Department of Mechanical Engineering, The University of Texas at Austin, Austin, TX 78712.

Proceedings of the National Academy of Sciences of the United States of America
|September 12, 2022
PubMed
Summary
This summary is machine-generated.

This study reveals time-dependent anelastic deformation in 3D nanolattices. Point defect diffusion, influenced by stress gradients and material structure, causes this reversible behavior, crucial for energy dissipation applications.

Keywords:
3D nanostructuresanelasticitynanoindentationnanolattices

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Area of Science:

  • Materials Science
  • Mechanical Engineering
  • Nanotechnology

Background:

  • Periodic three-dimensional (3D) nanolattices with ultrathin shells are engineered materials with unique mechanical properties.
  • Understanding their time-dependent deformation is critical for predicting performance and designing applications.

Purpose of the Study:

  • To investigate the anelastic deformation behavior of 3D nanolattices with thin shells.
  • To elucidate the underlying mechanisms and quantify the extent of anelasticity and recovery.

Main Methods:

  • Nanoindentation experiments were performed on 30-nm-thick aluminum oxide nanolattices.
  • Finite element analysis (FEA) coupled with diffusion of point defects was employed for modeling.

Main Results:

  • Nanolattices exhibited time-dependent deformation under constant load, with anelastic deformation up to 18.1% of elastic deformation.
  • Up to 15.7% recovery was observed after unloading, indicating reversible anelastic behavior.
  • FEA results qualitatively agreed with experimental data, highlighting the role of point defect diffusion and wavy tube profiles.

Conclusions:

  • Anelastic deformation in these nanolattices is attributed to reversible point defect diffusion driven by stress gradients.
  • The findings provide insights into the time-dependent mechanical response of nanolattice materials.
  • This understanding has implications for developing nanolattices for energy dissipation applications.