Author(s): Yukui Tian; Lu Liu; Dianzhe Li; Yinghui Wang; Shunying Ji
Linked Author(s):
Keywords: Discrete element method; Columnar polycrystalline sea ice; Anisotropy; Uniaxial compression test
Abstract:
Due to the columnar crystal structures coming from the natural formation process of sea ice, the strength along the growth direction is significantly higher than that in the laterally vertical direction. This characteristic results in the anisotropic mechanical behavior of the sea ice, which is a key factor in the generation of complex loads during the interaction between sea ice and structures. To accurately reproduce the anisotropic mechanical properties of natural sea ice materials, this study proposes a numerical simulation method for the anisotropy of columnar polycrystalline ice based on the discrete element method (DEM). By conducting numerical simulations of uniaxial compression in two loading directions with the C-axis at 0° and 90°, the anisotropic characteristics is revealed. The main simulation parameters in the DEM are validated by comparing them with in-situ sea ice mechanical test data. Based on this, uniaxial compression test simulations were performed for five other loading directions, including 15°, 30°, 45°, 60°, and 75°. The results indicate that when the angle is 0°, the compressive strength and elastic modulus of the sea ice sample are maximum, while at 45°, they are minimum. With different angles between the orientation between the columnar ice crystals and the loading direction, the mechanical performance of the sea ice sample behaves anisotropic characteristics. This further validates that the proposed method in this study can effectively simulate the elastic anisotropic mechanical properties of the columnar polycrystalline ice.
Year: 2024