Poisson's ratio Membrane section editor: Section Poisson's ratio
Contact angle computation in SLIPRING-type connector elements
The contact angle, , made by the belt wrapping around node b (see
“Connection-type library,” Section 28.1.5) is computed automatically in Abaqus/Explicit, ignoring the value specified within the Abaqus/Standard analysis.
Constraints
Most types of kinematic constraints (including multi-point constraints and surface-based tie constraints) specified in the original analysis are not imported and must be defined again in the import analysis; however, embedded element constraints are imported by default. See “Kinematic constraints: overview,” Section 31.1.1, for a discussion of the various types of kinematic constraints.
Interactions
Contact definitions specified in the original analysis and the contact state are not imported. Contact can be defined again in the import analysis by specifying the surfaces and contact pairs; however, you may not be able to use the exact contact
definitions that were used in the original analysis because of differences in the contact capabilities between Abaqus/Standard and Abaqus/Explicit.
The contact constraint enforcement may be different in Abaqus/Standard and Abaqus/Explicit. Examples of potential causes for differences include:
? Abaqus/Standard typically uses a “pure master-slave” approach, whereas Abaqus/Explicit typically uses a “balanced master-slave” approach.
? Depending on the contact formulations used, Abaqus/Standard and Abaqus/Explicit sometimes treat shell thicknesses and midsurface offsets differently.
Thus, when the contact conditions are defined in the import analysis, the contact state that existed in the previous analysis may not be reproduced at the beginning of the import analysis. This could lead to a redistribution of stresses and an analysis that differs from what you desire. In some cases this problem can be mitigated by using nondefault options, such as ignoring shell thicknesses in the contact calculations, to match behaviors in Abaqus/Standard and Abaqus/Explicit.
For a detailed description of the contact capabilities in Abaqus and the differences in the contact capabilities between Abaqus/Standard and Abaqus/Explicit, see “Contact interaction analysis: overview,” Section 32.1.1.
Output
Output can be requested for an import analysis in the same way as for an analysis in which the results are not imported. The output variables available in Abaqus/Standard are listed in “Abaqus/Standard output variable identifiers,” Section 4.2.1. The output variables available in Abaqus/Explicit are listed in “Abaqus/Explicit output variable identifiers,” Section 4.2.2.
The values of the following material point output variables will be continuous in an import analysis when the material state is imported: stress, equivalent plastic strain (PEEQ), and solution-dependent state variables (SDV) for UMAT and VUMAT. Similarly, for a connector behavior, the plastic relative displacement (CUP), kinematic hardening shift force (CALPHAF), overall damage (CDMG), damage initiation criteria (CDIF, CDIM, CDIP), friction accumulated slip (CASU), and connector status (CSLST, CFAILST) will be continuous.
If the reference configuration is not updated, the displacements, strains, whole element variables, section variables, and energy quantities will be reported relative to the original configuration. Accelerations are recomputed at the start of an import analysis in Abaqus/Explicit and may be different from those obtained at the end of an Abaqus/Standard analysis. The differences in accelerations arise from the recalculation of the internal forces created by the imported stresses using the Abaqus/Explicit element formulation algorithms.
If the reference configuration is updated, displacements, strains, whole element variables, section variables, and energy quantities will not be continuous in an
import analysis and will be reported relative to the updated reference configuration.
Time and step number will not be continuous between the original and the import analyses if the reference configuration is updated. Time and step number will be continuous only if the reference configuration is not updated.
Limitations
The import capability has the following known limitations. Where applicable, details are given in the relevant sections.
? The same release of Abaqus/Explicit and Abaqus/Standard must be run on computers that are binary compatible.
? The capability is not available for fluid elements; infinite elements; and spring, mass, dashpot, and rotary inertia elements. Connector elements can be imported from Abaqus/Standard to Abaqus/Explicit but not vice versa. See the discussion on “Elements” earlier in this section for further details.
? If connector elements are imported, the configuration can be updated provided that the state is not imported and the state can be imported provided that the configuration is not updated.
? All elements and nodes must be included in at least one set in the original analysis when importing part instances.
? Node sets that are generated from existing element sets (see “Node definition,” Section 2.1.1) must be defined in the original analysis.
? Surface definitions, contact pair definitions, and general contact definitions are not imported. Analytical rigid surfaces will not be imported.
? If the material state is imported, only stresses will be imported for material models other than those defined by linear elasticity, hyperelasticity, Mullins effect, hyperfoam, viscoelasticity, Mises plasticity (including the kinematic hardening models), extended Drucker-Prager plasticity, crushable foam plasticity, Mohr-Coulomb plasticity, critical state (clay) plasticity, cast iron plasticity, concrete damaged plasticity, damage for cohesive elements, damage for ductile metals, or damage for fiber-reinforced composites. See “Importing the material state” in “Transferring results between Abaqus analyses: overview,” Section 9.2.1, for details.
? If the state is imported for connector elements with behavior defined, the plastic displacements, the frictional slip, and the damage state are imported and the connector forces are recomputed. Some of the connector output variables, such as CU, are also recomputed on import. The recomputed variables may differ slightly at the point of import due to precision and algorithmic differences between the two solvers across import. See “Importing the material state” in “Transferring results between Abaqus analyses: overview,” Section 9.2.1, for details.