DEFORM-3D Keyword Documentation Part 10 pptx

OBJTYP OBJTYP Object, Otype, Ftype OPERAND DESCRIPTION DEFAULT Object Object Number None Otype Object deformability type None = 0 undefined = 1 rigid = 2 rigid plastic or viscoplastic = 3 porous = 4 elastic = 5 elastoplastic = 6 read from database (multiple operations only) = 7 user-defined (elasto-viscoplastic) Otype Object formulation type None For elastoplastic: = 0 Default = 1 Mixed = 2 Assumed strain DEFINITION OBJTYP specifies the deformability type of an object. REMARKS Rigid objects are treated as non-deformable materials. Elastic objects are treated as elastically deformable objects. The maximum material stress obtainable with an elastic object is the yield stress of the material. Plastic objects are treated as rigid viscoplastic materials. Plastic objects are assumed to be incompressible. Porous objects are treated the same as plastic objects except that the material density is calculated and updated as part of the simulation. Elastoplastic objects are treated as elastic objects until the yield point is reached. Then, any portions of the object that reach the yield point are treated as plastic, while the remainder of the object is treated as elastic. User defined objects require the user to write a subroutine that defines the constitutive relation for the material. For information on this routine, please refer to the user routines section in the user’ s manual. Any combination of object types can be used in a DEFORM simulation. Changing OBJTYP to zero will delete it when a database is written. Option 6 means that upon database generation, the information for that object will be obtained from the previous step in the database. This option is used in multiple operations as a means for carrying objects over from one operation to another. When this option is used, only a select group of settings may be changed in the user interface for this object (e.g. movement controls). Applicable object types: Rigid, Elastic, Plastic, Elastoplastic, Porous ODMAX ODMAX OuterDiameterOfRing OPERAND DESCRIPTION DEFAULT OuterDiameterOfRing stopping criterion of maximum diameter(radius) of ring 0.0 DEFINITION ODMAX limits the outside diameter of the ring object in the entire simulation. The simulation will be stopped when the outside diameter of the ring object reaches OuterDiameterOfRing , REMARKS Applicable simulation types: Ring Rolling Deformation RELATED TOPICS OTPRNG OTPRNG ObjNo, StopType, MinTemp, MaxTemp OPERAND DESCRIPTION DEFAULT ObjNo Object Number StopType: 0 - not activated 1 - stop when one node gets out of range 2 - stop when all nodes get out of range -n - stop when node n gets out of range Min Temp lower bound of the temperature range Max Temp lower bound of the temperature range DEFINITION OTPRNG specifies a stopping criteria which stops the FEM when temperature of the object is out of a range defined by minimum and maximum temperatures. It is meaningful only when the step definition STPDEF is Auto (which means step size is automatically determined by FEM, particularly useful for heat treating simulation). REMARKS PDIE PDIE Primary Die Primary Object OPERAND DESCRIPTION DEFAULT PrimaryDie Object number of the primary Die None PrimaryObject Object number of the primary object None DEFINITION PDIE specifies the primary die and primary object for simulation. REMARKS Characteristics of the primary die can be used to control various aspects of a simulation including  simulation time step size (DSMAX)  object movement (MOVCTL)  simulation termination criteria (SMAX, VMIN, LMAX). The primary die is usually assigned to the object most closely controlled by the forming machinery. For example, the die attached to the ram of a mechanical press would be designated as the primary object. If the primary die characteristics are not needed for controlling the time step size, object movement, or termination criteria, the object number assigned to be the primary die is immaterial. The primary workpiece is the object in which filling is determined for. If all the nodes are contacted on the surface of this object, the simulation will stop. Applicable simulation types: Isothermal Deformation Non-Isothermal Deformation RELATED TOPICS Primary object, Movement control, Termination parameters, Step parameters Keywords: SMAX, DSMAX, MOVCTL, LMAX, VMIN PENINF PENINF Penalty OPERAND DESCRIPTION DEFAULT Penalty Interface penalty constant 1.0E+12 DEFINITION PENINF is a large positive constant used to penalize the penetration velocity when a boundary node of one object comes into contact with another object [2]. REMARKS PENINF is needed to numerically model physical contact between deforming objects. When a slave and master object come into contact, there is a tendency for nodes from the slave object to penetrate the surface of the master object. PENINF reduces the penetration depth by reducing the penetration velocity [2]. velocitypen = contact pressure/ Penalty It is recommended that the interface penalty constant be at least 1000 times the volume penalty constant, PENVOL. Generally the default value of Penalty is satisfactory. Applicable simulation types: Isothermal Deformation Non-Isothermal Deformation RELATED TOPICS Node penetration, Inter-object contact Keywords: PENVOL PENVOL PENVOL Object, VolPenalty, Type OPERAND DESCRIPTION DEFAULT Object Object number None VolPenalty Volume penalty constant 106 Type Function type None = 1 Constant penalty constant DEFINITION PENVOL specifies a volume penalty constant that is used to enforce the volume constancy of plastic objects. This can be achieved by a constant or variable PENVOL. REMARKS The volume penalty constant can be determined using PENVOL > 1000 * average flow stress average strain rate The average flow stress can be determined by evaluating the flow stress data (FSTRES) at the average values of strain, strain rate, and temperature that the object will experience during the simulation. This value should be used as constant unless convergence problems are experienced, then one must use the variable PENVOL. The volume penalty constant is required for plastic objects. Applicable object types: Plastic RELATED TOPICS Keywords: AVGSTR [...]... POISSON specifies the Poisson's ratio of a particular material It is defined as the negative ratio of lateral and axial strains that result from an applied axial stress SYSTEM UNITS: (DIMENSIONLESS) EXAMPLES Example of type 4 data format … Concentration/ 800 900 100 0 0.1 0.3 0.4 0.5 0.2 0.6 0.23 0.35 0.3 0.32 0.12 0.15 Temperature POISSON 2 4 3 3 800 900 100 0 0.1 0.2 0.3 0.3 0.4 0.5 0.6 0.23 0.35 0.32... temperature =2 function of atom content Num Number of data pairs DEFINITION PHASLH is the latent heat that is produced when material 1 transforms into material 2 SYSTEM UNITS: N/mm2 EXAMPLE PHASLH 1 1 1 3 600 100 700 140 800 160 REMARKS PHASTF PHASTF Mat1, Mat2, Itype OPERAND DESCRIPTION DEFAULT Mat1 Material number 1 NONE Mat2 Material number 2 NONE Itype function type =0 no relationship =1 mat1  mat2 =2... Young's modulus Poisson Poisson's ratio Applicable Simulation Modules: Deformation Microstructure Applicable Simulation Modes: Deformation Applicable Objects: Elastic and Elastoplastic RELATED TOPICS Keywords: YOUNG PRSNAM PRSNAM Object Name OPERAND DESCRIPTION DEFAULT Object Object Number Name Press Name None None character string up to 64 characters DEFINITION PRSNAM provides a description of the... PreLoad, CurStretch OPERAND DESCRIPTION DEFAULT Object Object Number Stiffness Press stiffness None 0 Preload Pre-load of the press None CurStretch Current stretch of the press 0 DEFINITION PRSTRE This keyword is to incorporate the press stretch (elastic energy loss) into the simulation With die stretch, the total die displacement within step = current die increment current stretch increment The total . Inter-object contact Keywords: PENVOL PENVOL PENVOL Object, VolPenalty, Type OPERAND DESCRIPTION DEFAULT Object Object number None VolPenalty Volume penalty constant 106 Type Function. data format … Concentration/ Temperature 800 900 100 0 0.1 0.3 0.4 0.5 0.2 0.6 0.23 0.35 0.3 0.32 0.12 0.15 POISSON 2 4 3 3 800 900 100 0 0.1 0.2 0.3 0.3 0.4 0.5 . Deformation RELATED TOPICS Primary object, Movement control, Termination parameters, Step parameters Keywords: SMAX, DSMAX, MOVCTL, LMAX, VMIN PENINF PENINF Penalty OPERAND DESCRIPTION DEFAULT