Defining a Shell Thickness Bound

Shell thicknesses can be controlled to vary between a lower or upper bound (CHECK_TYPE = THICKNESS_BOUNDS). For the definition of the thickness bounds, either an absolute or relative value for the upper and lower bound can be defined. In case of relative bounds a real number is specified for each bound which is multiplied with the initial value for the shell thickness to get the absolute upper and lower bounds.

This task shows you how to:

See Also
In Other Guides
DVCON_SIZING

Context:

Shell thicknesses can be controlled to vary between a lower or upper bound (CHECK_TYPE = THICKNESS_BOUNDS). For the definition of the thickness bounds, either an absolute or relative value for the upper and lower bound can be defined. In case of relative bounds a real number is specified for each bound which is multiplied with the initial value for the shell thickness to get the absolute upper and lower bounds.

The parameter MAGNITUDE defines if the lower and upper bound are defined as absolute or relative values.

Define Thickness Bounds in Tosca Structure.gui

  1. Choose Command > DVCON_SIZING in Tosca Structure.pre screen.
  2. Apply an ID_NAME and select the element group that is to be frozen. If the element group is not already defined, it is necessary to define it in advance using the GROUP_DEF command.
  3. Choose Type = Thickness_bounds and define a relative (REL) or absolute (ABS) upper and lower value:

Parameter File

The resulting command looks like: 
DVCON_SIZING
  ID_NAME     = dvcon_thickness_bounds
  EL_GROUP    = my_group 
  CHECK_TYPE  = THICKNESS_BOUNDS
  MAGNITUDE   = REL/ABS 
  LOWER_BOUND = …
  UPPER_BOUND = …
END_