Bond Model of Dilated Polyhedral DEM and its Applications in Sea Ice Simulation

The simulation of breaking process of continuum is an important issue for discrete element method. An explicit bonding method is developed based on Rigid Body Spring Method (RBSM) to simulate fracture with Dilated-polyhedron DEM (DP-DEM) in this paper. Minkowski sum of basic polyhedron and sphere is used to generate the dilated polyhedral element. Bond points are fixed on the common face between elements. Each bond point represents average area of the common face. The strain on every bond point is calculated by the division of distance between bond points and characteristic length. Then the stress can be determined according the stiffness in RBSM. The bond force at bond point is evaluated by stress and average area of every bond point. So the resultant force and moment of each element could be obtained by summation of force at each bond point and its moment to mass center. The complex matrix calculation and the integral for stiffness in RBSM could be avoided to save computational resources. The fracture on the interface is decided by MohrCoulomb criterion. After the fracture, DEM would take charge of the broken element in contact computation. This method is built to simulate the fracture of sea ice interacting with structure. The ice loads on structure and broken ice shape is analyzed to measure the applicability of this method in sea ice simulations.


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  • Accession Number: 01745948
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Jul 17 2020 2:28PM