This section summarizes the changes and the additions that have been made to the options that define an ABAQUS model.
| mod | (S) | *ADAPTIVE MESH CONTROLS |
You can now use the GEOMETRIC ENHANCEMENT parameter in ABAQUS/Standard to specify enhanced smoothing algorithms. A new volume-based smoothing method is available in ABAQUS/Standard. | ||
| new | (E) | *BLOCKAGE |
Control the combination of surfaces that can cause blockage of flow out of a surface-based fluid cavity. | ||
| mod | (S)(E) | *CLEARANCE |
Include the new BOLT parameter to indicate that the appropriate contact normal directions for a thread bolt connection will be generated automatically based on thread geometry data and two points on the axis of the bolt/bolt hole specified on the data lines. | ||
| mod | (S) | *COMPLEX FREQUENCY |
You can use the PROPERTY EVALUATION parameter to specify the frequency at which frequency-dependent materials properties are evaluated in the complex eigenvalue extraction procedure. | ||
| mod | (S) | *CONNECTOR DAMAGE EVOLUTION |
You can now use this option in ABAQUS/Standard to define connector damage evolution for connector elements that have available components of relative motion. | ||
| mod | (S) | *CONNECTOR DAMAGE INITIATION |
You can now use this option in ABAQUS/Standard to define connector damage initiation criteria for connector elements that have available components of relative motion. | ||
| mod | (E) | *CONNECTOR LOCK |
Use the new DEPENDENCIES parameter in ABAQUS/Explicit to specify the number of field variable dependencies included in the definition of the connector lock data, in addition to temperature. If this parameter is omitted, it is assumed that the connector lock is independent of field variables. | ||
| mod | (S) | *CONNECTOR SECTION |
Use the new DEPENDENCIES parameter to specify the name of a section controls definition to be used for the connector elements. This parameter applies only in ABAQUS/Standard. | ||
| mod | (S) | *CONSTRAINT CONTROLS |
Use the new, optional PRINT parameter to print the constraint chains to the message file. If this parameter is omitted, the constraint chains will not be printed. | ||
| mod | (S)(E) | *CONTACT CONTROLS |
Use the new LAGRANGE MULTIPLIER parameter to specify whether contact constraints will be enforced with Lagrange multipliers. Setting LAGRANGE MULTIPLIER=NO is not recommended for problems with a high stiffness because it may lead to numerical problems (such as singularities) during equation solution. | ||
| mod | (E) | *CONTACT INCLUSIONS |
The ALL ELEMENT BASED parameter has been replaced by the new ALL EXTERIOR parameter, which specifies self-contact for a default unnamed, all-inclusive surface that includes all element-based surface facets as well as all analytical rigid surfaces. If ALL EXTERIOR is omitted, the contact surfaces must be specified on the data lines. | ||
| mod | (S)(E) | *CONTACT PAIR |
The TYPE parameter is now allowed with finite-sliding contact. | ||
| mod | (S) | *CONTROLS |
Set FIELD=MATERIAL FLOW to set parameters for the material flow degree of freedom for connector elements. | ||
| mod | (S)(E) | *CO-SIMULATION |
Use this option to identify the external program for co-simulation with ABAQUS. Set PROGRAM=MPCCI to solve fluid-structure interaction problems with the structure modeled in ABAQUS and the fluid in a third-party CFD analysis tool that can interface through MpCCI. For crash safety simulations with the vehicle modeled in ABAQUS/Explicit and the occupant or the pedestrian modeled in the MADYMO program, set PROGRAM =MADYMO. The definition of the interface regions and the selection of solution quantities to be communicated between ABAQUS and the external program is now moved to the new *CO-SIMULATION REGION option. | ||
| new | (S)(E) | *CO-SIMULATION REGION |
Use this option to identify the interface regions in the ABAQUS model and select the solution quantities to be exchanged with the external program in a co-simulation. | ||
| mod | (S)(E) | *DAMAGE EVOLUTION |
This option can now be used for elements with a plane stress formulation (plane stress, shell, continuum shell, and membrane elements) used with the damage model for fiber-reinforced materials. You can now define data lines to specify damage evolution for TYPE=ENERGY, SOFTENING=LINEAR for the damage model for fiber-reinforced materials. | ||
| mod | (E) | *DAMAGE INITIATION |
Use CRITERION=HASHIN to specify damage initiation criteria based on the Hashin analysis. Use CRITERION=JOHNSON COOK to specify the Johnson-Cook damage initiation criterion. Use CRITERION=MSFLD to specify a damage initiation criterion based on the Müschenborn-Sonne forming limit diagram. | ||
| mod | (S) | *DIRECT CYCLIC |
Use the new TIME POINTS parameter to specify the name of the *TIME POINTS option that defines the time points at which the response of the structure will be evaluated. | ||
| mod | (S)(E) | *DISTRIBUTING |
Use the new COUPLING parameter to specify the coupling method used to couple the displacement and rotation of the reference node to the average motion of the surface nodes within the influence radius. Set COUPLING=CONTINUUM (default) to couple the displacement and rotation of each attachment point to the average displacement of the surface nodes within the influence radius. Set COUPLING=STRUCTURAL to couple the displacement and rotation of each attachment point to the average displacement and rotation of the surface nodes within the influence radius. The STRUCTURAL parameter value is available only in three-dimensional analyses. | ||
| mod | (S)(E) | *DLOAD |
Use the new REF NODE parameter to define a reference node to obtain the relative velocity for viscous pressure, stagnation pressure, viscous body, and stagnation body loads in ABAQUS/Explicit. | ||
| mod | (S)(E) | *DSLOAD |
Use the new REF NODE parameter to define a reference node to obtain the relative velocity for viscous pressure and stagnation pressure loads in ABAQUS/Explicit. | ||
| mod | (S)(E) | *FASTENER |
Include the new COUPLING parameter to specify the coupling method used to couple the displacement and rotation of each attachment point to the average motion of the surface nodes within the radius of influence from the fastener projection point. Set COUPLING=CONTINUUM (the default value) to couple the displacement and rotation of each attachment point to the average displacement of the surface nodes within the radius of influence. Set COUPLING=STRUCTURAL to couple the displacement and rotation of each attachment point to the average displacement and rotation of the surface nodes within the radius of influence. | ||
| mod | (E) | *FLUID CAVITY |
Include the new AMBIENT TEMPERATURE parameter to define the ambient temperature for heat energy flow between a fluid cavity and its environment. The MINIMUM VOLUME parameter can now be set equal to a positive value or to INITIAL VOLUME. When MINIMUM VOLUME=INITIAL VOLUME, the minimum volume of fluid cavity will be set equal to the initial volume of the cavity. Set MIXTURE=MOLAR FRACTION to use the molar fraction for a mixture of ideal gases. The default value is MIXTURE=MASS FRACTION. | ||
| new | (E) | *FLUID EXCHANGE ACTIVATION |
This option has replaced the *FLUID EXCHANGE INTERACTION option to activate fluid exchange definitions. | ||
| rem | (E) | *FLUID EXCHANGE INTERACTION |
This option has been replaced by the *FLUID EXCHANGE ACTIVATION option. | ||
| mod | (E) | *FLUID EXCHANGE PROPERTY |
The TYPE parameter can now take the values ENERGY FLUX and ENERGY RATE LEAKAGE to define the heat energy flow rate. | ||
| new | (E) | *FLUID INFLATOR ACTIVATION |
This option has replaced the *FLUID INFLATOR INTERACTION option to activate fluid inflator definitions. | ||
| rem | (E) | *FLUID INFLATOR INTERACTION |
This option has been replaced by the *FLUID INFLATOR ACTIVATION option. | ||
| mod | (E) | *FLUID INFLATOR MIXTURE |
Use the new TYPE parameter to define the type of gas species used for a fluid inflator. Set TYPE=MOLAR FRACTION to use the molar fraction for a mixture of ideal gases; use the default value of TYPE=MASS FRACTION to use the mass fraction for a mixture of ideal gases.. | ||
| new | (S) | *FLUID LEAKOFF |
This new option defines leak-off coefficients for pore pressure cohesive elements. | ||
| mod | (S) | *FREQUENCY |
Use EIGENSOLVER=AMS to select the automatic multi-level substructuring (AMS) eigensolver. | ||
| new | (S) | *GAP FLOW |
This new option defines tangential flow constitutive parameters for pore pressure cohesive elements. | ||
| mod | (S) | *HYSTERESIS |
This option now allows the specification of an extra material parameter that helps regularize the creep strain rate at zero strain. | ||
| mod | (S)(E) | *IMPEDANCE |
Two new required, mutually exclusive parameters have been added. Include the PROPERTY parameter to specify the name of the *IMPEDANCE PROPERTY option defining the table of impedance values to be used. Include the NONREFLECTING parameter to provide nonreflecting boundary conditions to define impedances. The IMPROVED PLANE parameter has been removed, and the improved plane wave radiation condition is now specified using NONREFLECTING=IMPROVED. | ||
| mod | (S)(E) | *IMPEDANCE PROPERTY |
This option now allows either admittance values or impedance values to define an impedance. Include the new DATA parameter to specify the type of data used in a table of impedance values. The TYPE parameter has been removed, and nonreflecting boundary conditions are now specified using the NONREFLECTING parameter of the *IMPEDANCE or *SIMPEDANCE option. | ||
| mod | (S)(E) | *INCIDENT WAVE |
This option has been superseded by the *INCIDENT WAVE INTERACTION option and will be removed in a subsequent release of ABAQUS. | ||
| mod | (S)(E) | *INCIDENT WAVE FLUID PROPERTY |
This option has been superseded by the *INCIDENT WAVE INTERACTION PROPERTY option and will be removed in a subsequent release of ABAQUS. | ||
| new | (S)(E) | *INCIDENT WAVE INTERACTION |
New interface for applying incident wave loading. | ||
| new | (S)(E) | *INCIDENT WAVE INTERACTION PROPERTY |
New interface for defining geometric data and fluid properties for incident wave loading. | ||
| mod | (S)(E) | *INCIDENT WAVE PROPERTY |
This option has been superseded by the *INCIDENT WAVE INTERACTION PROPERTY option and will be removed in a subsequent release of ABAQUS. | ||
| mod | (S)(E) | *INCIDENT WAVE REFLECTION |
This option now accepts a single reflection coefficient value instead of an impedance property name. | ||
| mod | (S)(E) | *INCLUDE |
When referencing an encrypted external file, set the new PASSWORD parameter equal to the file's password. Passwords are case-sensitive. | ||
| mod | (S)(E) | *INITIAL CONDITIONS |
The TYPE parameter can now take the value INITIAL GAP to identify the elements within which tangential fluid flow exists initially. The TYPE parameter can now take the value PLASTIC STRAIN to define initial values of the plastic strain tensor. Include the SECTION POINTS parameter to specify plastic strains at individual section points through the thickness of a shell element. The TYPE parameter can now take the value REF COORDINATE in ABAQUS/Explicit to define a reference mesh for membrane elements. | ||
| mod | (S) | *MATRIX ASSEMBLE |
Include the new MASS parameter to specify the name of the mass matrix. | ||
| mod | (S)(E) | *OUTPUT |
Include the new TIME POINTS parameter to specify the name of the set of time points that defines the time points at which output is to be written. | ||
| mod | (S)(E) | *REBAR LAYER |
Include the new GEOMETRY parameter to specify the type of rebar geometry you want to define. The default value is CONSTANT, which specifies constant rebar spacing in the element. The ANGULAR SPACING parameter has been removed. | ||
| mod | (S)(E) | *RESTART |
For ABAQUS/Standard analyses, you can now use the NUMBER INTERVAL parameter to specify the number of intervals to which restart data will be written, and you can now use the TIME MARKS parameter to write results at the exact times dictated by the NUMBER INTERVAL parameter. This functionality was previously available only for ABAQUS/Explicit analyses. | ||
| mod | (S) | *SECTION CONTROLS |
For modified tetrahedral and triangular elements in ABAQUS/Standard, you can now use HOURGLASS=ENHANCED to specify the enhanced hourglass control method (default) or use HOURGLASS=STIFFNESS to select the total stiffness approach. | ||
| mod | (S)(E) | *SIMPEDANCE |
Two new required, mutually exclusive parameters have been added. Include the PROPERTY parameter to specify the name of the *IMPEDANCE PROPERTY option defining the table of impedance values to be used. Include the NONREFLECTING parameter to provide nonreflecting boundary conditions to define impedances. The IMPROVED PLANE parameter has been removed, and the improved plane wave radiation condition is now specified using NONREFLECTING=IMPROVED. | ||
| mod | (S)(E) | *SOLID SECTION |
The REF NODE parameter is now required for acoustic infinite elements. | ||
| mod | (S) | *STEADY STATE TRANSPORT |
The optional STABILIZE parameter is now available for steady-state transport analyses. Include this parameter to use automatic stabilization if the problem is expected to be unstable due to local instabilities. | ||
| mod | (S)(E) | *STEP |
Include the new CONVERT SDI parameter to specify how severe discontinuities (such as contact changes) are accounted for during nonlinear analysis. If CONVERT SDI=NO (the default setting), ABAQUS/Standard forces a new iteration if severe discontinuities occur during an iteration; if CONVERT SDI=YES, ABAQUS/Standard estimates residual forces associated with severe discontinuities and checks whether the equilibrium tolerances are satisfied. | ||
| mod | (S)(E) | *SURFACE BEHAVIOR |
The new PENALTY parameter applies only to ABAQUS/Standard analyses with a default hard pressure-overclosure relationship, and it enables you to choose the penalty method for enforcement of the contact constraint. The PRESSURE-OVERCLOSURE parameter can now take the value SCALE FACTOR in ABAQUS/Explicit to define an exponential pressure-overclosure relationship based on the default contact stiffness. | ||
| mod | (E) | *SURFACE PROPERTY ASSIGNMENT |
The PROPERTY=FEATURE EDGE CRITERIA option in ABAQUS/Explicit has two new data line items to activate feature edges: PICKED EDGES activates particular feature edges in the model, and ALL EDGES activates all edges of a particular surface. | ||
| mod | (S) | *SYMMETRIC MODEL GENERATION |
The optional TRANSPORT parameter has been removed. The generated model can be used to perform a steady-state transport analysis only if it is a full 360° body. The optional PERIODIC parameter can now take a value of CONSTANT (default) to indicate that each generated sector in the periodic model has a constant angle or a value of VARIABLE to indicate that each generated sector in the periodic model can have a variable angle. | ||
| mod | (S)(E) | *TIME POINTS |
Include the new NAME parameter to specify a label that will be used to refer to the time points. | ||
| mod | (S)(E) | *TRANSVERSE SHEAR STIFFNESS |
You can now define the slenderness compensation factor for Timoshenko beams by giving a value or including a label SCF on the data line. If the label SCF is included, the values of the transverse shear stiffness and the slenderness compensation factor will be calculated from the elastic material definition used with the beam section. | ||
| new | (S)(E) | *UNDEX CHARGE PROPERTY |
Define an UNDEX charge for incident waves. | ||
| mod | (S) | *VISCOELASTIC |
Two new optional parameters have been added. The TYPE parameter specifies whether the *VISCOELASTIC option is used for specifying continuum material properties (TYPE=ISOTROPIC) or effective thickness-direction gasket properties (TYPE=TRACTION). The PRELOAD parameter can be used to specify the nature of the preload used to specify the frequency-domain properties of dynamic stiffness and damping. It can be set equal to either UNIAXIAL or VOLUMETRIC, corresponding to uniaxial or volumetric preloads, respectively. |