Skip to main content
placeholder image

Anisotropic Fracture Dynamics Due to Local Lattice Distortions

Journal Article


Abstract


  • A brittle material under loading fails by the nucleation and propagation of a sharp crack. In monatomic crystals, such as silicon, the lattice geometries front to the crack-tip changes the way of propagation even with the same cleavage surface. In general, however, crystals have multiple kinds of atoms and how the deformation of each atom affects the failure is still elusive. Here, we show that local atomic distortions from the different types of atoms causes a propagation anisotropy in suspended WS2 monolayers by combining annular dark-field scanning transmission electron microscopy and empirical molecular dynamics that are validated by first-principles calculations. Conventional conditions for brittle failure such as surface energy, elasticity, and crack geometry cannot account for this anisotropy. Further simulations predict the enhancement of the strengths and fracture toughness of the materials by designing void shapes and edge structures.

UOW Authors


  •   Zhou, Si (external author)

Publication Date


  • 2019

Citation


  • Jung, G. S., Wang, S., Qin, Z., Zhou, S., Danaie, M., Kirkland, A. I., . . . Warner, J. H. (2019). Anisotropic Fracture Dynamics Due to Local Lattice Distortions. ACS Nano, 13(5), 5693-5702. doi:10.1021/acsnano.9b01071

Scopus Eid


  • 2-s2.0-85066838335

Web Of Science Accession Number


Start Page


  • 5693

End Page


  • 5702

Volume


  • 13

Issue


  • 5

Place Of Publication


Abstract


  • A brittle material under loading fails by the nucleation and propagation of a sharp crack. In monatomic crystals, such as silicon, the lattice geometries front to the crack-tip changes the way of propagation even with the same cleavage surface. In general, however, crystals have multiple kinds of atoms and how the deformation of each atom affects the failure is still elusive. Here, we show that local atomic distortions from the different types of atoms causes a propagation anisotropy in suspended WS2 monolayers by combining annular dark-field scanning transmission electron microscopy and empirical molecular dynamics that are validated by first-principles calculations. Conventional conditions for brittle failure such as surface energy, elasticity, and crack geometry cannot account for this anisotropy. Further simulations predict the enhancement of the strengths and fracture toughness of the materials by designing void shapes and edge structures.

UOW Authors


  •   Zhou, Si (external author)

Publication Date


  • 2019

Citation


  • Jung, G. S., Wang, S., Qin, Z., Zhou, S., Danaie, M., Kirkland, A. I., . . . Warner, J. H. (2019). Anisotropic Fracture Dynamics Due to Local Lattice Distortions. ACS Nano, 13(5), 5693-5702. doi:10.1021/acsnano.9b01071

Scopus Eid


  • 2-s2.0-85066838335

Web Of Science Accession Number


Start Page


  • 5693

End Page


  • 5702

Volume


  • 13

Issue


  • 5

Place Of Publication