Main Help → All Commands → FEA Boundary Conditions → FixLine
Nodal and element face boundary conditions in FEA analyses can be applied to nodes or elements by using a series of FixLine
commands. There are two versions of the command. The first one selects a line through the mesh.
FixLine (x1),(y1),(x2),(y2),<(tol)> (Displacement and Load) (optional Rotate and/or Select command) EndFixLine
All nodes close to that line can be assigned load or dislacement conditions or rotated for skewed boundary conditions. The second version selects a previously defined Path:
FixLine (id) (Displacement, Load, and Stress commands) (optional Rotate and/or Select command) EndFixLine
All nodes or element faces along that path can be assigned nodal load or displacement conditions, rotated for skewed boundary conditions, or assigned stresses on element faces. The parameters int he above commands are:
(x1,y1)
and (x2,y2)
define (x,y)
coordinates (in length units) for the points at the beginning and end of the line (or (R, Z)
coordinates in axisymmetric calculations).(tol)
is optional tolerance (in length units). If omitted, a small tolerance suitable for the current mesh will be selected automatically.(id)
is the id
of a previously defined path.Within FixLine
blocks, there can be Displacement and Load commands to set displacements or loads in the x
and/or y
direction, a Rotate command to rotate the nodes for skewed boundary conditions, Stress commands to apply normal and/or tangential stresses on element faces, or a Select command to select nodes for conditional output of results. All nodes within a distance specified by (tol)
of the selected line or along the defined path (id)
will be assigned each specified nodal boundary condition or rotated.
Stress boundary conditions can only be applied along paths specified by their (id)
. Furthermore, You cannot set Stress boundary conditions along interior paths; they can only be assigned to paths on the edge of the mesh.
FixLine
command is only allowed for FEA analyses.