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论文类型：期刊论文

发表时间：2022-06-28

发表刊物：力学学报

所属单位：运载工程与力学学部

卷号：47

期号：6

页面范围：1046-1057

ISSN号：0459-1879

摘要：With the polyhedron elements with complex geometric shapes, the linear
   contact force model cannot precisely obtain the contact force and its
   direction and the contact deformation under various contact patterns.
   Due that dilated polyhedral element can be generated with superposing
   one dilating sphere on the surface of one basic polyhedron in the
   Minkowski sum theory to construct the geometric shape of irregular
   particle accurately, and then its contact detection between particles
   can be calculated easily, considering different contact patterns between
   vertices, edges and planes of the dilated polyhedral elements, a unified
   nonlinear viscoelastic contact force model is developed. In this model,
   the equivalent radius of curvature is introduced to calculate the
   elastic contact stiffness in normal direction. Meanwhile, the viscous
   force and the elastic force in tangential direction are simplified based
   on the contact force model of spherical element. To simulate the sea ice
   floes in broken ice region, the sea ice elements are generated randomly
   with the Voronoi tessellation algorithm. The ice loads on a vertical
   cylinder pile are simulated with the dilated polyhedral elements
   considering the buoyancy and drag forces of current. Moreover, the
   influences of ice velocity and ice floe size on the ice of pile are
   determined, and the distribution of ice load around the cylindrical pile
   is obtained. Finally, the limitation of the present dilated polyhedral
   element and its further modification are discussed.

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