Quad9 class

Parent class

Element classes

Class doc

9-node quadrilateral

Full bi-quadratic interpolation

       1
    x     y
x^2   x*y   y^2
  x^2*y x*y^2
    x^2*y^2

class femedu.elements.finite.Quad9.Quad9(node0, node1, node2, node3, node4, node5, node6, node7, node8, material, label=None)

class: representing a plane 9-node quadrilateral

This element works as 2D plate, loaded in-plane, and as a 3D membrane element.

For 2D plate behavior, define nodes as two-dimensional nodes
For 3D membrane behavior, define nodes as three-dimensional nodes

computeSurfaceLoads()

compute surface loads using faces

This method should be called during updateState() by every element supporting surface loads

resetLoads(): default implementation for resetting element loads.

setSurfaceLoad(face, pn, ps=0)

face ID	nodes defining that face
0	`node 0` to `node 4` to `node 1`
1	`node 1` to `node 5` to `node 2`
2	`node 2` to `node 6` to `node 3`
3	`node 3` to `node 7` to `node 0`

Parameters:

face – face ID for the laoded face
pn – magnitude of distributed normal load per area. Tension on a surface is positive.
ps – magnitude of distributed shear load per area. Positive direction is defined as shown in the above table.

updateState()