Discretization ============== Degrees of freedom ------------------ .. csv-table:: "**Modeling**", "**Degrees of Freedom** **(at each vertex node)**" "AXIS_SI ", "DX: corresponds to the radial displacement DY: corresponds to the longitudinal displacement" "D_ PLAN_SI ", "DX: next move :math:`X` DY: next move :math:`Y`" "C_ PLAN_SI ", "DX: next move :math:`X` DY: next move :math:`Y`" Support mesh for stiffness matrices ------------------------ The support cells for finite elements can be triangles or quadrangles. The elements are iso-parametric. Only the element based on mesh QUAD8 is under-integrated. .. csv-table:: "**Models**", "**Mesh**", "**Interpolation**", "**integration**" "AXIS_SI D_ PLAN_SI C_ PLAN_SI "," TRIA3 QUAD4 TRIA6 QUAD8 QUAD9 ", "Linear Bi-linear Quadratic Serendip Bi-Quadratic", "complete Reduced completes Reduced complete" Cargo support mesh ------------------------------ .. csv-table:: "**Models**", "**Mesh**", "**Interpolation**" "AXIS_SI D_ PLAN_SI C_ PLAN_SI "," SEG2 SEG3 ", "Linear or Quadratic"