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connector behavior, and
materials defined in user subroutines UMAT and VUMAT.
For all other material models only stresses will be imported. No other state variables will be imported.
If the material behavior is defined in a user subroutine, you must ensure that the UMAT and VUMAT are consistent.
If connector elements are imported, the state can be imported provided that the configuration is not updated.
Input Usage:
File Use the following option to specify that the material state should be
imported:
*IMPORT, STATE=YES
Use the following option to specify that the material state should not be imported:
*IMPORT, STATE=NO
For models that are defined as assemblies of part instances, the *IMPORT option must appear within a part instance definition.
Abaqus/CAE In Abaqus/CAE you can import model data and results only from Usage:
models that are defined as assemblies of part instances. Abaqus/CAE
always imports the material state. If you want to import only the deformed mesh, you can import an orphan mesh from a selected step and increment of an output database; see “What kinds of files can be imported and exported from Abaqus/CAE?,” Section 10.1.1 of the Abaqus/CAE User's Manual.
Redefining constraints upon import
Most constraints (such as multi-point constraints and surface-based tie constraints) are not imported from the original analysis and must be redefined in the import analysis. For constraints such as surface-based ties it is appropriate to redefine these constraints in the original reference configuration. This ensures identical constraint data are regenerated in the import analysis. In an Abaqus/Standard analysis with adaptive meshing and acoustic-to-structure tie constraints, the structural as well as the acoustic nodes may move from their initial positions. When such acoustic and structure meshes are imported from Abaqus/Standard into Abaqus/Explicit and the tie constraint is redefined, the acoustic elements at the interface may appear distorted when viewed in the undeformed plot mode in the Visualization module of Abaqus/CAE (the deformed plot at time=0 displays the correct mesh). To regenerate constraints in the original configuration, specify that the reference configuration should not be updated to the imported configuration. If a new constraint is defined in the import analysis, it is appropriate to generate the
constraint data based on the current configuration. See “Updating the imported configuration” above for more information.
Importing element set and node set definitions
All element set and node set definitions associated with the imported elements are imported by default. For models that are not defined as assemblies of part instances, you can also selectively import only specified element set or node set definitions. This capability provides a convenient way of selectively reusing the element or node sets defined in the original analysis. However, any members of such sets that do not belong to the imported elements are removed from the specified sets.
For example, suppose three element sets—SHELL3D, MEMB, and ALL—are defined in the original analysis. Element set ALL contains all of the elements in element sets SHELL3D and MEMB, as well as other elements. You choose to import only the element sets SHELL3D and MEMB (i.e., the elements in these sets as well as the element set definitions). In addition, you selectively import the element set definition ALL (but not the elements in this set). If element 100 belongs to element set ALL but not to either element set SHELL3D or element set MEMB, it will not be imported and will be removed from the list of elements belonging to element set ALL. The imported element set definitions are processed before any node or element definitions; therefore, even if element 100 is subsequently redefined in the
import analysis, it will not belong to element set ALL (unless it is explicitly assigned to element set ALL in the import analysis).
Only node and element sets defined in the original or previous import analysis are available for importing. New sets defined during a restart run cannot be imported.
Input File Use either or both of the following options immediately following the Usage: *IMPORT option to import selected element or node set definitions:
*IMPORT ELSET *IMPORT NSET
For models that are defined as assemblies of part instances, you cannot selectively import element and node set definitions. All element and node set definitions are imported automatically.
Abaqus/CAE In Abaqus/CAE you can import model data and results only from Usage:
models that are defined as assemblies of part instances. You cannot selectively import element and node set definitions in Abaqus/CAE. All element and node set definitions are imported automatically.
Specifying a tolerance for shell normals in the updated configuration
When the imported configuration is updated upon import, the mesh discretization may not satisfy the mesh geometry checks imposed in Abaqus/Explicit or
Abaqus/Standard to evaluate whether or not a mesh is reasonable. In the case of highly warped shell elements it is possible that the normal at the center of the element that is calculated from the midsurface interpolation may differ from the normal that is interpolated from the rotated normals at the nodes. If the difference exceeds the tolerance specified, the analysis will terminate. This suggests that a fine mesh may be required to model areas of high curvature change to achieve a successful analysis.
The unit normal computed from the midsurface interpolation, predicted by the interpolation of the rotated normals at the nodes, the condition:
where you can specify the tolerance, default value of
= 0.1 is used.
, and that , must satisfy
. If you do not specify a tolerance value, a
Input File If you update the reference configuration to be the imported Usage:
configuration, you can specify a tolerance for error checking on shell normals:
*IMPORT CONTROLS, NORMAL TOL=
Abaqus/CAE Usage: The shell normal tolerance is not supported in Abaqus/CAE.
Abaqus Analysis User's Manual