This section summarizes the changes and the additions that have been made to the options that define an Abaqus model.
| mod | (S) | *ACOUSTIC FLOW VELOCITY |
This option can now be used only in linear perturbation analyses. | ||
| mod | (S) | *BASE MOTION |
In steady-state dynamic analysis, the LOAD CASE parameter has been replaced by the REAL and IMAGINARY parameters to define real and imaginary loading. | ||
| mod | (S) | *BOUNDARY |
In steady-state dynamic analysis, the LOAD CASE parameter has been replaced by the REAL and IMAGINARY parameters to define real and imaginary loading. | ||
| mod | (E) | *CAST IRON COMPRESSION HARDENING |
This option can now be used in Abaqus/Explicit to define the compression hardening data for the gray cast iron plasticity model. | ||
| mod | (E) | *CAST IRON PLASTICITY |
This option can now be used in Abaqus/Explicit to define the plastic properties for the gray cast iron plasticity model. | ||
| mod | (E) | *CAST IRON TENSION HARDENING |
This option can now be used in Abaqus/Explicit to define the tension hardening data for the gray cast iron plasticity model. | ||
| mod | (S) | *CECHARGE |
In steady-state dynamic analysis, the LOAD CASE parameter has been replaced by the REAL and IMAGINARY parameters to define real and imaginary loading. | ||
| mod | (S) | *CHANGE FRICTION |
For the default Coulomb friction model employing the penalty method, amplitude curves can now be used to change the allowable elastic slip during a step. | ||
| mod | (E) | *CLAY HARDENING |
This option can now be used in Abaqus/Explicit to define piecewise linear hardening/softening of the Cam-clay plasticity yield surface. | ||
| mod | (E) | *CLAY PLASTICITY |
This option can now be used in Abaqus/Explicit to specify the plastic part of the material behavior for elastic-plastic materials that use the Cam-clay plasticity model. | ||
| mod | (S) | *CLOAD |
In steady-state dynamic analysis, the LOAD CASE parameter has been replaced by the REAL and IMAGINARY parameters to define real and imaginary loading. | ||
| mod | (S) | *CONDUCTIVITY |
The new PORE FLUID parameter has been added to allow specification of the thermal conductivity of the pore fluid in a geostatic or soils consolidation analysis that models heat transfer in a fully coupled manner with the pore fluid flow and the mechanical deformations. | ||
| mod | (S) | *CONNECTOR LOAD |
In steady-state dynamic analysis, the LOAD CASE parameter has been replaced by the REAL and IMAGINARY parameters to define real and imaginary loading. | ||
| mod | (S) | *CONNECTOR MOTION |
In steady-state dynamic analysis, the LOAD CASE parameter has been replaced by the REAL and IMAGINARY parameters to define real and imaginary loading. | ||
| mod | (E) | *CONTACT CLEARANCE |
The SEARCH NSET parameter can now be used to identify initially bonded nodes in a crack propagation analysis using the VCCT criterion. | ||
| mod | (S)(E) | *CONTACT FORMULATION |
Two new values are available for the TYPE parameter. Set TYPE=SLIDING TRANSITION to control the smoothness of the surface-to-surface formulation upon sliding for specific interactions in Abaqus/Standard. Set TYPE=POLARITY to choose which sides of double-sided elements will be considered for node-to-face or Eulerian-Lagrangian contact with another surface in Abaqus/Explicit. | ||
| mod | (S) | *CONTACT INITIALIZATION DATA |
Set the new INITIAL CLEARANCE parameter equal to a positive value to specify an initial clearance distance. Include the INTERFERENCE FIT parameter without setting it to a value to treat initial overclosures as interference fits. Set this parameter equal to a positive value to specify an interference distance. If this parameter is omitted, initial overclosures are resolved with strain-free adjustments. Set the SEARCH ABOVE parameter equal to a positive value to ensure that the search zone for contact initialization includes gaps at least as large as the specified value. Set the SEARCH BELOW parameter equal to a positive value to ensure that the search zone for contact initialization includes overclosures at least as large as the specified value. | ||
| mod | (S) | * CONTACT PAIR |
Use the new MIDFACE NODES parameter to indicate if you want to automatically convert most three-dimensional second-order element types with no midface node (serendipity elements) that form a slave surface of a surface-to-surface contact pair into elements with a midface node. Use the new SLIDING TRANSITION parameter to control the smoothness of nodal contact force redistribution upon sliding for surface-to-surface contact pairs. | ||
| new | (S) | *CONTACT STABILIZATION |
Define contact stabilization controls for general contact. | ||
| mod | (S) | *CONTOUR INTEGRAL |
The new XFEM parameter allows you to indicate that the crack is modeled as an enriched feature with the extended finite element method. | ||
| new | (E) | *CONWEP CHARGE PROPERTY |
Define a CONWEP charge for incident waves. | ||
| mod | (S)(E) | *CO-SIMULATION |
Two new values are available for the PROGRAM parameter. Set PROGRAM=MULTIPHYSICS for exchange of data between Abaqus and the SIMULIA Co-Simulation Engine, which in turn can exchange data with third-party analysis programs that support the SIMULIA Co-Simulation Engine. Set PROGRAM=DCI for exchange of data between Abaqus and certain third-party analysis programs. Consult the User's Guide for the third-party analysis program to determine when this option is applicable. The PROGRAM=ACUSOLVE setting is no longer available. | ||
| mod | (S)(E) | *CO-SIMULATION CONTROLS |
The conditions for which the STEP SIZE parameter is required or optional are revised. Set STEP SIZE=MAX for Abaqus to select the maximum coupling step size based on the suggested coupling step size of Abaqus and the external program. Set STEP SIZE=MIN for Abaqus to select the minimum coupling step size based on the suggested coupling step size of Abaqus and the external program. The new COUPLING SCHEME and SCHEME MODIFIER parameters are available for specifying coupling behavior when using the *CO-SIMULATION, PROGRAM=MULTIPHYSICS option. Use the new FACTORIZATION FREQUENCY parameter in an Abaqus/Standard analysis to control the frequency of the interface matrix factorization. | ||
| mod | (S) | *DAMAGE INITIATION |
When the crack is modeled as an enriched feature with the extended finite element method, four new damage initiation criteria are supported. Set CRITERION=QUADE to specify a damage initiation based on the quadratic separation-interaction criterion. Set CRITERION=QUADS to specify a damage initiation based on the quadratic traction-interaction criterion. Set CRITERION=MAXE to specify a damage initiation based on the maximum nominal strain criterion. Set CRITERION=MAXS to specify a damage initiation based on the maximum nominal stress criterion. Use the new NORMAL DIRECTION parameter to specify the crack propagation direction for enriched elements when one of the four crack initiation criteria mentioned above is satisfied. | ||
| mod | (S) | *DAMPING CONTROLS |
This option can now be used with the *MATRIX GENERATE and *SUBSTRUCTURE GENERATE options. If the STRUCTURAL parameter is omitted or the option is not used as a suboption of *SUBSTRUCTURE PROPERTY, the substructure property uses COMBINED as the default with the structural factor specified under the *DAMPING, STRUCTURAL option. If the VISCOUS parameter is omitted or the option is not used as a suboption of *SUBSTRUCTURE PROPERTY, the substructure property uses COMBINED as the default with the mass and stiffness proportional Rayleigh damping factors specified under the *DAMPING, ALPHA or BETA option. | ||
| mod | (S) | *DEBOND |
The VISCOSITY parameter on this option has been removed. Use the new VISCOSITY parameter on the *FRACTURE CRITERION option to specify the viscosity coefficient used in the viscous regularization in Abaqus/Standard. | ||
| mod | (S) | *DECHARGE |
In steady-state dynamic analysis, the LOAD CASE parameter has been replaced by the REAL and IMAGINARY parameters to define real and imaginary loading. | ||
| mod | (S) | *DENSITY |
The new PORE FLUID parameter has been added to allow specification of the density of the pore fluid in a geostatic or soils consolidation analysis that models heat transfer in a fully coupled manner with the pore fluid flow and the mechanical deformations. | ||
| mod | (S) | *DLOAD |
In steady-state dynamic analysis, the LOAD CASE parameter has been replaced by the REAL and IMAGINARY parameters to define real and imaginary loading. | ||
| mod | (S) | *DSECHARGE |
In steady-state dynamic analysis, the LOAD CASE parameter has been replaced by the REAL and IMAGINARY parameters to define real and imaginary loading. | ||
| mod | (S) | *DSLOAD |
In steady-state dynamic analysis, the LOAD CASE parameter has been replaced by the REAL and IMAGINARY parameters to define real and imaginary loading. | ||
| mod | (S) | *DYNAMIC |
Use the new APPLICATION parameter to choose a general time integration method based on the nature of the analysis you are performing. Several other parameters have been added or revised to allow fine control over the time-integration scheme for dynamic analyses. | ||
| mod | (E) | *ELASTIC |
Use the new TYPE=SHEAR value to define the shear modulus of the material. This option replaces the *EOS SHEAR, TYPE=ELASTIC option. | ||
| mod | (E) | *EOS |
A new value is available for the TYPE parameter. Set TYPE=IGNITION AND GROWTH for an ignition and growth equation of state. Use the new DETONATION ENERGY parameter to specify the energy of detonation for an ignition and growth equation of state. | ||
| rem | (E) | *EOS SHEAR |
This option has been replaced by the *ELASTIC, TYPE=SHEAR option (to define shear elastic behavior) and by the *VISCOSITY option (to define the shear viscosity of the material). | ||
| new | (E) | *EULERIAN MESH MOTION |
Define the motion of an Eulerian mesh. | ||
| mod | (E) | *EULERIAN SECTION |
Use the new ADVECTION parameter to specify a first-order or second-order (default) advection algorithm to remap solution variables after remeshing has been performed. Set the new FLUX LIMIT RATIO parameter equal to the ratio between the maximum distance a node is allowed to move during one increment and the characteristic length of the Eulerian element containing the node. | ||
| mod | (S) | *EXPANSION |
Use the new FIELD parameter to identify the predefined field variable that will be used to drive field expansion strains. | ||
| mod | (S) | *FIELD |
Use the new OUTPUT VARIABLE parameter in conjunction with the FILE parameter to define predefined fields using nodal temperatures (NT), normalized concentrations (NNC), and electric potentials (EPOT) read from previously generated output databases. | ||
| mod | (E) | *FILTER |
Use the new INVARIANT parameter in conjunction with the OPERATOR parameter to indicate that you want the maximum, minimum, or absolute maximum of the output variable's invariant to be filtered and monitored over time. Use the filter in combination with element or nodal field output (*OUTPUT, FIELD). | ||
| mod | (E) | *FLUID EXCHANGE |
A new value is available for the EFFECTIVE AREA parameter. Set EFFECTIVE AREA=USER to indicate that user subroutine VUFLUIDEXCHEFFAREA will be used to define the effective area of the surface taking the local material state into account. Set the new CONSTANTS parameter equal to the number of fluid exchange constants needed as data to define the effective area for fluid exchange in user subroutine VUFLUIDEXCHEFFAREA. | ||
| mod | (E) | *FLUID EXCHANGE PROPERTY |
A new value is available for the TYPE parameter. Set TYPE=USER to indicate that user subroutine VUFLUIDEXCH is used to define fluid exchange by specifying the mass flow rate and/or heat energy flow rate. Set the new CONSTANTS parameter equal to the number of constant values needed as data to define the fluid exchange in user subroutine VUFLUIDEXCH. Set the new DEPVAR parameter equal to the number of solution-dependent state variables required for user subroutine VUFLUIDEXCH. | ||
| mod | (S)(E) | *FRACTURE CRITERION |
This option can now be used in Abaqus/Explicit to define brittle fracture crack propagation using a VCCT criterion in the context of general contact surface-based cohesive behavior. This option can also be used in Abaqus/Standard to specify a linear elastic fracture mechanics-based criterion for crack propagation in enriched elements. Use the new NORMAL DIRECTION parameter to specify the crack propagation direction for enriched elements. Use the new VISCOSITY parameter to specify the viscosity coefficient used in the viscous regularization in Abaqus/Standard. | ||
| new | (E) | *GAS SPECIFIC HEAT |
Define reacted product's specific heat for an ignition and growth equation of state. | ||
| mod | (S) | *GEOSTATIC |
Use the new HEAT parameter to specify if heat transfer is to be modeled when this procedure is used with the new family of coupled temperature–pore pressure elements. Use the new UTOL parameter to invoke automatic time incrementation and specify the tolerance for the maximum change of displacements. | ||
| mod | (S) | *GLOBAL DAMPING |
This option can now be used with the *MATRIX GENERATE and *SUBSTRUCTURE GENERATE options. | ||
| mod | (S)(E) | *INCIDENT WAVE INTERACTION |
In steady-state dynamic analysis, the LOAD CASE parameter has been replaced by the REAL and IMAGINARY parameters to define real and imaginary loading. Use the new CONWEP parameter to indicate interaction with a blast wave from an explosion in air. This parameter applies only to Abaqus/Explicit analyses. | ||
| mod | (E) | *INCIDENT WAVE INTERACTION PROPERTY |
Two new values are available for the TYPE parameter. Set TYPE=AIR BLAST or TYPE=SURFACE BLAST to indicate interaction with a blast wave from an explosion in air. | ||
| mod | (S)(E) | *INITIAL CONDITIONS |
Use the new OUTPUT VARIABLE parameter in conjunction with the TYPE=FIELD and FILE parameters to initialize predefined fields using nodal temperatures (NT), normalized concentrations (NNC), and electric potentials (EPOT) read from previously generated output databases. The INTERPOLATE parameter can now be used in conjunction with the TYPE=PORE PRESSURE and FILE parameters to initialize pore pressures from previously generated output databases with dissimilar meshes. | ||
| mod | (S) | *LATENT HEAT |
The new PORE FLUID parameter has been added to allow specification of the latent heat of the pore fluid in a geostatic or soils consolidation analysis that models heat transfer in a fully coupled manner with the pore fluid flow and the mechanical deformations. | ||
| mod | (S) | *MATRIX INPUT |
Use the new TYPE parameter to define the shape (symmetric or unsymmetric) of the matrix. | ||
| mod | (E) | *MOHR COULOMB |
This option can now be used in Abaqus/Explicit to define the yield surface and flow potential parameters for elastic-plastic materials that use the Mohr-Coulomb plasticity model. | ||
| mod | (E) | *MOHR COULOMB HARDENING |
This option can now be used in Abaqus/Explicit to define piecewise linear hardening/softening behavior for a material defined by the Mohr-Coulomb plasticity model. | ||
| mod | (E) | *NODAL ENERGY RATE |
This option can now be used in Abaqus/Explicit to define the variable critical energy release rates for a crack propagation analysis using the VCCT criterion. | ||
| mod | (S) | *PLASTIC |
You can now set HARDENING=JOHNSON COOK to specify Johnson-Cook hardening in an Abaqus/Standard analysis. | ||
| mod | (S) | *PRESSURE PENETRATION |
In steady-state dynamic analysis, the LOAD CASE parameter has been replaced by the REAL and IMAGINARY parameters to define real and imaginary loading. | ||
| mod | (S) | |
The default value for the SOLVE parameter is now YES. | ||
| mod | (S) | *RADIATION VIEWFACTOR |
Use the new INFINITESIMAL, INTEGRATION, and LUMPED AREA parameters to customize the accuracy and speed of viewfactor calculations. | ||
| mod | (S) | *RATE DEPENDENT |
You can now set TYPE=JOHNSON COOK to specify Johnson-Cook rate dependence in an Abaqus/Standard analysis. | ||
| new | (E) | *REACTION RATE |
Define the reaction rate for an ignition and growth equation of state. | ||
| mod | (E) | *SHELL GENERAL SECTION |
You can now define distributions of composite layer angles and shell general section stiffnesses in an Abaqus/Explicit analysis. | ||
| mod | (E) | *SHELL SECTION |
You can now define distributions of composite layer angles in an Abaqus/Explicit analysis. | ||
| mod | (S) | *SOILS |
Use the new HEAT parameter to specify if heat transfer is to be modeled when this procedure is used with the new family of coupled temperature–pore pressure elements. Use the new DELTMX parameter to invoke automatic time incrementation and to specify the maximum temperature change allowed within an increment. | ||
| mod | (S) | *SOLVER CONTROLS |
You can no longer specify the number of domains used by the iterative linear equation solver. | ||
| mod | (S) | *SPECIFIC HEAT |
The new PORE FLUID parameter has been added to allow specification of the specific heat of the pore fluid in a geostatic or soils consolidation analysis that models heat transfer in a fully coupled manner with the pore fluid flow and the mechanical deformations. | ||
| mod | (S) | *STEADY STATE DYNAMICS |
A new value is available for the INTERVAL parameter. Set INTERVAL=SPREAD to define frequency points spread around eigenfrequencies. | ||
| mod | (S) | *STEP |
A new value is available for the SOLVER parameter. Set SOLVER=ITERATIVE to use the iterative linear equation solver. The SOLVER=DDM setting is no longer available. | ||
| mod | (S)(E) | *SUBMODEL |
Use the new INTERSECTION ONLY parameter to specify that Abaqus ignore submodel driven nodes that are found to lie outside the region of the global model elements. | ||
| mod | (S)(E) | *SURFACE INTERACTION |
Use the new TRACKING THICKNESS parameter to specify a thickness that determines the contacting surfaces to be tracked. | ||
| new | (S)(E) | *TENSION CUTOFF |
Specify tension cutoff data for the Mohr-Coulomb plasticity model. | ||
| mod | (E) | *TRIAXIAL TEST DATA |
This option can now be used in Abaqus/Explicit to provide triaxial test data. | ||
| mod | (E) | *TRS |
This option can be used in Abaqus/Explicit only in conjunction with the *VISCOSITY option. | ||
| new | (E) | *VISCOSITY |
Define the shear viscosity of the material. This option replaces the *EOS SHEAR, TYPE=VISCOUS option. |