The normal and tangential displacement imposed condition
allows you to specify the normal and tangential displacement components on the
boundary section. The normal displacement component is denoted by d
and the tangential component by d
. This condition is used when the boundary section is either fixed
or embedded. Though the default condition corresponds to d
= d
= 0, you can assign nonzero values for one or both of the
components.
Important: In 3D, d
is a vector with two components.
Note the sign convention for d
and d
. A positive d
signifies that the displacement emerges from the domain of the
sub-task.
A positive d
is oriented in 2D along the anticlockwise direction on the
closed curve surrounding the domain of the sub-task for an external
boundary. For internal boundaries of 2D domains that are not simply
connected, the orientation is reversed. It is complicated to assign a value of d
in 3D because the definition of d
depends on conventions of orientation that are not easy to
define. Therefore in 3D, the normal and tangential displacement condition is used for a zero tangential displacement only.
To define the normal and tangential displacement on a boundary section you will need to do the following:
Select Normal and tangential displacement imposed (dn, ds) from the list of boundary conditions.
Normal and tangential displacement imposed (dn, ds)
Specify d
as Constant, Linear
function of coordinates, Map from CSV (Excel)
file, or User-defined function. Select the Upper level menu. Ansys Polydata will open the menu where you can specify d
in a similar manner (2D only).