The SurfaceTraction object defines surface traction on a region.
The SurfaceTraction object is derived from the Load object.
import load mdb.models[name].loads[name]
This method creates a SurfaceTraction object.
mdb.models[name].SurfaceTraction
Required arguments
A String specifying the load repository key.
A String specifying the name of the step in which the load is created.
A Region object specifying the region to which the load is applied.
A Float or Complex specifying the load magnitude. magnitude is optional if distributionType=USER_DEFINED.
Optional arguments
A SymbolicConstant specifying how the surface traction is distributed spatially. Possible values are UNIFORM, USER_DEFINED, and FIELD. The default value is UNIFORM.
A String specifying the name of the AnalyticalField object associated with this load. The field argument applies only when distributionType=FIELD. The default value is an empty string.
A String or the SymbolicConstant UNSET specifying the name of the amplitude reference. UNSET should be used if the load has no amplitude reference. The default value is UNSET. You should provide the amplitude argument only if it is valid for the specified step.
A Float specifying an additional rotation of directionVector about an axis. The default value is 0.0.
A SymbolicConstant specifying the axis about which to apply an additional rotation of directionVector. Possible values are AXIS_1, AXIS_2, and AXIS_3. The default value is AXIS_1.
None or a DatumCsys object specifying the local coordinate system of the load's degrees of freedom. If localCsys=None, the degrees of freedom are defined in the global coordinate system or by the userCsys parameter if defined. When this member is queried, it returns an Int. The default value is None.
A String specifying a CSYS defined by a user-subroutine. If userCsys=None, the degrees of freedom are defined in the global coordinate system or by the localCsys parameter if defined. The default value is "None".
A VertexArray object of length 2 specifying the direction of the load. Instead of through a Vertex, each point may be specified through a tuple of coordinates. If traction is SHEAR, then directionVector will be projected onto the region surface. This parameter is available only if traction is GENERAL or SHEAR.
A Boolean specifying whether the direction of the force changes with rotation. The default value is ON.
This parameter may be modified only if traction is GENERAL. You should provide the follower argument only if it is valid for the specified step.
A Boolean specifying whether the to maintain a constant resultant force by defining traction per unit undeformed area. If resultant is OFF, traction is defined per unit deformed area. The default value is OFF.
You should provide the resultant argument only if it is valid for the specified step.
A SymbolicConstant specifying how to apply surface traction. Possible values are SHEAR and GENERAL. The default value is SHEAR.
Return value
A SurfaceTraction object.
Exceptions
This method modifies the data for an existing SurfaceTraction object in the step where it is created.
Required arguments
Optional arguments
The optional arguments to setValues are the same as the arguments to the SurfaceTraction method, except for the name and createStepName arguments.
Return value
Exceptions
This method modifies the propagating data for an existing SurfaceTraction object in the specified step.
Required argument
A String specifying the name of the step in which the load is modified.
Optional arguments
A Float, a Complex, or the SymbolicConstant UNCHANGED specifying the load magnitude. UNCHANGED should be used if the magnitude is propagated from the previous analysis step.
A String or a SymbolicConstant specifying the name of the amplitude reference. Possible values for the SymbolicConstant are UNCHANGED and FREED. UNCHANGED should be used if the amplitude is propagated from the previous analysis step. FREED should be used if the load has no amplitude reference. You should provide the amplitude argument only if it is valid for the specified step.
Return value
Exceptions
The SurfaceTraction object can have the following members:
A String specifying the load repository key.
A Float specifying an additional rotation of directionVector about an axis. The default value is 0.0.
A SymbolicConstant specifying the axis about which to apply an additional rotation of directionVector. Possible values are AXIS_1, AXIS_2, and AXIS_3. The default value is AXIS_1.
A Boolean specifying whether the direction of the force changes with rotation. The default value is ON.
This parameter may be modified only if traction is GENERAL. You should provide the follower argument only if it is valid for the specified step.
A Boolean specifying whether the to maintain a constant resultant force by defining traction per unit undeformed area. If resultant is OFF, traction is defined per unit deformed area. The default value is OFF.
You should provide the resultant argument only if it is valid for the specified step.
A SymbolicConstant specifying how to apply surface traction. Possible values are SHEAR and GENERAL. The default value is SHEAR.
A SymbolicConstant specifying how the surface traction is distributed spatially. Possible values are UNIFORM, USER_DEFINED, and FIELD. The default value is UNIFORM.
A String specifying the name of the AnalyticalField object associated with this load. The field argument applies only when distributionType=FIELD. The default value is an empty string.
A String specifying a CSYS defined by a user-subroutine. If userCsys=None, the degrees of freedom are defined in the global coordinate system or by the localCsys parameter if defined. The default value is "None".
None or a DatumCsys object specifying the local coordinate system of the load's degrees of freedom. If localCsys=None, the degrees of freedom are defined in the global coordinate system or by the userCsys parameter if defined. When this member is queried, it returns an Int. The default value is None.
A VertexArray object of length 2 specifying the direction of the load. Instead of through a Vertex, each point may be specified through a tuple of coordinates. If traction is SHEAR, then directionVector will be projected onto the region surface. This parameter is available only if traction is GENERAL or SHEAR.
A Region object specifying the region to which the load is applied.