Ring Load
A load applied to a point, not located at the axis of revolution, in an axisymmetric model actually represents a ring load. Add a Ring Load to points located at R > 0 to model such loads.
Through-Thickness Location
Select a surface — Top Surface, Midsurface, or Bottom Surface. The default is that the load is applied at the midsurface. The effect of using another surface than the midsurface is that for a tangential load, the distance from the midsurface is used to compute an additional equivalent moment load.
To place the load at another distance from the midsurface, select the Offset check box, and enter a value for the offset, zoffset.
If the material model is Section Stiffness, there may physically not be a well-defined top and bottom surface. If the load is applied at such a surface, the thickness value used to compute the load is taken from the settings in the Thickness and Offset node.
If a selected point is connected to boundaries having different thicknesses, then the result of specifying Top Surface or Bottom Surface is not well-defined.
Force
Select the Load type — Force per unit length, Force per unit area, or Total force. Enter values or expressions for FL, FA, or Ftot.
Moment
Select the Load type — Moment per unit length, Moment per unit area, or Total moment. Enter values or expressions for ML, MA, or Mtot.
•
The Load list normally only contains User defined. When combining with another physics interface that can provide this type of load, it is also possible to choose a predefined load from this list.
•
The Total force and Total moment options should not be directly interpreted as resultants, since the orientation is changing. Rather, it should be interpreted as the per unit length values, multiplied by 2πr, where r is the radius of the point.
•
You can add the Phase subnode to specify the phase of this load in a frequency domain analysis.
•
You can specify this load to be a Harmonic Perturbation in a frequency domain analysis.
•
You can assign this load to a load group. See Load Cases in the Structural Mechanics Modeling chapter.
Location in User Interface
Context Menus
Shell>Ring Load
Ribbon
Physics tab with Shell selected:
Points>Shell>Ring Load