Dytran > Building A Model > Introduction to Building a Model
XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX''">XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX''">   
Introduction to Building a Model
There are many aspects to building a finite element analysis model. In several cases, the forms used to create the finite element data are dependent on the selected analysis code and analysis type. Other parts of the model are created using standard forms.
The Analysis option on the Preferences menu brings up a form where the user can select the analysis code (e.g., Dytran).
The analysis code may be changed at any time during model creation. This is especially useful if the model is to be used for different analyses, in different analysis codes. As much data as possible will be converted if the analysis code is changed after the modeling process has begun. The analysis option defines what will be presented to the user in several areas during the subsequent modeling steps.
These areas include the material and element libraries, including multi-point constraints, the applicable loads and boundary conditions, and the analysis forms. The selected Analysis Type may also affect the allowable selections in these same areas. For more details, see The Analysis Form (p. 8) in the MSC.Patran Reference Manual.
Table 2‑1 summarize the various Dytran commands supported by the Patran Dytran Analysis Preference.
Table 2‑1
File Section
Subsection
Data Entry
Method
File Management Section
Prestress Analysis
BULKOUT, NASTDISP, PRESTRESS, SOLUOUT
Analysis/Initiating Calculation
New Analysis
NASTINP, NASTOUT, SOLINIT, START
Analysis/Initiating Calculation
Restart Control
RESTART, RSTFILE, RSTBEGIN
Analysis/Restart
User Code
USERCODE
Analysis/Initiating Calculation
File Selection
SAVE,
TYPE
Analysis/Output Requests
IMMFILE
Analysis/Initiating Calculation
Executive Control
Execution Control
CEND, MEMORY-SIZE, TIME
Analysis/Execution Controls
Case Control
Analysis Control
ENDSTEP,
ENDTIME
Analysis/Execution Controls
CHECK
Analysis/Initiating Calculation
Data Selection
SPC,
TIC,
TLOAD,
Analysis/Select Load Cases
Output Control
SET,
SETC
Analysis/Output Requests
TITLE
Analysis
Output Selection - Entity Specification
ACC,
COG,
CONTS,
PLSURFS,
CSECS,
EBDS,
LEMENTS,
BAGS,
GRIDS,
HIC,
MATS,
RELS,
RIGIDS,
UBSURFS,
URFACES
Analysis/Output Requests
PLANES, USASURFS
Not Supported
Output Selection - Variable Specification
CONTOUT,
CPLOUT,
SOUT,
BDOUT,
LOUT,
BAGOUT,
POUT,
ATOUT,
BOUT,
ELOUT,
UBSOUT,
SURFOUT
Analysis/Output Requests
Case Control (continued)
 
Output Frequency
STEPS,
TIMES
Analysis/Output Requests
User Defined Output
ELEXOUT, GPEXOUT
Analysis/Output Requests
Input File Control
INCLUDE
Analysis/Translation Parameter
Miscellaneous
PARAM
Analysis
Bulk Data
Grid Points
GRID
Finite Elements/Nodes
GRDSET
Analysis/Default Gridpoint
GROFFS
Analysis/Gridpoint Offset
Coordinate Systems
CORD2C, CORD2R, CORD2S
Geometry/Coordinates
CORD1C, CORD1R, CORD1S
Not Supported
CORD3R, CORD4R
Not Supported
CORDROT
Not Supported
Hourglass
HGSUPPR
Element Property
Lagrangian, 0-D
CONM2
Element Property
PDAMP
Element Property
PELAS, PELAS1, PELASEX
Element Property
Lagrangian, Solid Elements
CHEXA
Elements/3D
CPENTA
Elements/3D
CTETRA
Elements/3D
PSOLID
Element Property
Bulk Data (continued)
Lagrangian, Surface Elements
CQUAD4
Elements/2D
CTRIA3
Elements/2D
PSHELL
Element Property
PSHELL1
Element Property
PCOMP, PCOMPA
Element Property
Lagrangian, 1-D Elements
CBAR
Elements/1D
CBEAM
Elements/1D
CROD
Elements/1D
CDAMP1
Elements/1D
CDAMP2
Not Supported
CELAS1
Elements/1D
CELAS2
Not Supported
CSPR
Elements/1D
CVISC
Elements/1D
PBAR
Element Property
PBCOMP
Element Property
PBEAM, PBEAM1, PBEAML
Element Property
PBELT
Element Property
PDAMP
Element Property
PELAS, PELAS1, PELASEX
Element Property
PROD
Element Property
PSPR, PSPR1, PSPREX
Element Property
PVISC, PVISC1, PVISCEX
Element Property
PWELD, PWELD1, PWELD2
Element Property
Bulk Data (continued)
Eulerian, Solid Elements
CHEXA
Elements/3D
CPENTA
Elements/3D
CTETRA
Elements/3D
PEULER, PEULER1
Element Property
Mesh Generator
MESH
LBC/Mesh Generator
Constitutive Models
DMAT, DMATEL, DMATEP, DMATOR
Material
DYMAT14, DYMAT24, DYMAT25, DYMAT26
Material
FOAM1, FOAM2
Material
MAT1, MAT2, MAT8, MAT8A
Material
FABRIC
Material
RUBBER1
Material
SHEETMAT
Material
Yield Models
YLDEX,
YLDJC, YLDMC, YLDMSS, YLDPOL, YLDRPL, YLDTM, YLDVM, YLDZA
Material
YLDHY
Not Supported
Shear Models
SHREL,
SHREX, SHRLVE, SHRPOL
Material
Bulk Data (continued)
Equations of State
EOSEX, EOSGAM, EOSIG, EOSJWL, EOSPOL, EOSTAIT
Material
Failure Models
FAILEST, FAILEX, FAILEX1, FAILMES, FAILMPS, FAILPRS, FAILSDT
Material
Spallation Models
PMINC
Material
Rigid Bodies
MATRIG
Material
RBE2
Finite Elements/MPC’s
RBE2-FULLRIG
LBC
RBHINGE
LBC/Rigid Body Hinge
RELEX
Not Supported
RELLIPS
LBC/Rigid Ellipsoid
RIGID
LBC/Rigid Surface
RPLEX
Not Supported
ATB Interface
ATBACC, ATBJNT, ATBSEG
Not Supported
Lagrangian, Single Point Constraints
SPC, SPC1, SPC2, SPC3
LBC
Bulk Data (continued)
Lagrangian, Contact Surfaces
CONTACT, CONTFORC
LBC/Contact
SURFACE, SUBSURF, CFACE, SET1
LBC/Contact
CONTINI
Not Supported
CONTREL
LBC/Rigid Ellipsoid
CSEG,
CFACE1
Not Supported
Lagrangian, Connections
JOIN
Not Supported
BJOIN
LBC/Bjoin
KJOIN
LBC/Kjoin
RCONN
LBC/Rigid Connection
RCONREL
Not Supported
RJCYL, RJPLA, RJREV, RJSPH, RJUNI, RJTRA
LBC/Rigid Joint Constraint
Lagrangian, Rigid Wall
WALL
LBC/Planar Rigid Wall
Lagrangian, Rigid Body Constraint
RBC3
Not Supported
Lagrangian, Transient Loading
TLOAD1
LBC (Field)
DAREA
Not Supported
FORCE, FORCE1, FORCE2
LBC
MOMENT, MOMENT1, MOMENT2
LBC
PLOAD
LBC
PLOAD4
Not Supported
RFORCE
LBC/Follower Force
GRAV
Analysis/General Parameters
Bulk Data (continued)
Lagrangian, Enforced Motions
TLOAD1
LBC (Field)
TLOAD2
Not Supported
DAREA
Not Supported
FORCE
LBC
FORCE3, FORCEEX
Not Supported
MOMENT
LBC
Lagrangian, Initial Conditions
TIC3
LBC/Init. Rotation Field
TICGP
LBC/Init. Velocity
TICEL
LBC/Init. Cond. Euler
TIC, TIC1, TIC2, TICEEX, TICGEX
Not Supported
Eulerian, Single Point Constraints
ALEGRID, ALEGRID1
LBC/Coupling
SPC, SPC1, SPC2, SPC3
LBC
Eulerian, Flow Boundary
TLOAD1
LBC
FLOW
LBC/Flow
FLOWEX, FLOWDEF
Not Supported
PORFLOW
LBC/Coupling
CFACE
LBC
Eulerian, Wall
WALLET
LBC/Barrier
Eulerian, Gravity
GRAV
Analysis/Gen. Parameters
Bulk Data
(continued)
Eulerian, Initial Conditions
TIC3
LBC/Init. Rotation Field
TICGP
LBC/Init. Velocity
TICEUL, TICVAL
LBC/Init. Cond. Euler
CYLINDER, SPHERE
LBC/Init. Cond. Euler
MATINI
LBC/Init. Cond. Euler
BOX
Not Supported
Eulerian, Container
FFCONTR
LBC/Fluid Filled Containers
Lagrangian Loading and Constraints
PLOADEX
Not Supported
Detonation Wave
DETSPH
LBC/Detonation Wave
Body Force
BODYFOR
LBC/Body Force
Euler/Lagrange Coupling
COUPLE, COUOPT, COUPOR, COUHTR, COUINFL, COUPLE1, COUP1FL, COUP1INT
LBC/Coupling
HTRCONV, HTRRAD
LBC/Coupling
PORFLOW
LBC/Coupling
SURFACE, SUBSURF, CFACE, SET1
LBC/Coupling
ALE
LBC/Coupling
Bulk Data (continued)
Euler/Lagrange Coupling (continued)
GBAG, GBAGCOU, GBAGPOR, GBAGHTR, GBAGINFL
LBC/Airbag
COUPLE, COUOPT, COUPOR, COUHTR, COUINFL
LBC/Airbag
GBAGC
Not Supported
HTRCONV, HTRRAD
LBC/Airbag
INFLATR, INFLATR1, INFLHYB, INFLHYB1, INFLFRAC, INFLGAS, INFLTANK, INITGAS
LBC/Airbag
PERMEAB, PERMGBG, PORHOLE, PORLHOLE, PORFCPL, PORFGBG, PORFLCPL, PORFLGBG
LBC/Airbag
POREX
Not Supported
SURFACE, SUBSURF, CFACE, SET1
LBC/Airbag
Parameters
PARAM
Analysis
Tabular Input
TABLED1
Fields
TABLEEX
Not Supported
Bulk Data (continued)
Miscellaneous
IGNORE, MADGRP, SECTION, SGAUGE,
USA
Not Supported
Sets
SET1, SETC
Analysis/Special Features
Solution Control
ACTIVE
Analysis/Entity Activation
VISCDMP
Analysis/Dynamic Relaxation
Output
SECTION
Not Supported
Prestress Analysis
NASINIT
Analysis/Initiating Calculations
Include File Control
INCLUDE
Automatic
Bulk Data Control
BEGIN BULK
Automatic
END DATA
Automatic
Parameter Options
Coupling Subcycling
COSUBCYC, COSUBMAX
Analysis/Sub Cycling Params
Blending Control
DELCLUMP, FBLEND
Analysis/Coupling Parameter
Time Step Control
INISTEP, MAXSTEP, MINSTEP, STEPFCT, STEPFCTL
Analysis/Execution Control
License Control
AUTHQUEUE
Analysis/Execution Control
Mass Scaling
SCALEMAS
Analysis/Execution Control
Limits
FMULTI, LIMITER, MICRO, RHOCUT, RKSCHEME, ROHYDRO, ROMULTI, ROSTR
Analysis/Eulerian Parameter
SNDLIM
Analysis/General Parameters
VELCUT, VELMAX
Analysis/Eulerian Parameter
Parameter Options (continued)
Restart Control
RSTDROP
Analysis/Restart Control
Ale Motion Control
ALEITR, ALETOL, ALEVER
Analysis/ALE Parameters
Coupling Control
FASTCOUP
Analysis/Coupling Parameters
Contact Control
CONTACT, LIMCUB
Analysis/Contact Parameters
Miscellaneous
CFULLRIG
Analysis/General Parameters
EULTRAN
Analysis/Eulerian Parameter
Miscellaneous (continued)
EXTRAS
Analysis/User Subroutine Par
GEOCHECK
Analysis/General Parameters
IMM
Analysis/Initiating Calculations
MATRMRG1
Analysis/Rigid Body Merging
MIXGAS
Analysis/Eulerian Parameter
NZEROVEL
Analysis/Default Gridpoint
RJSTIFF
Analysis/General Parameters
UGASC
Analysis/Eulerian Parameter
VARACTIV
Analysis/Variable Activation
CLUMPENER, ENTROPY-FIX, FAILDT , FLOW -METHOD, HYDROBOD, IGNFRCER, MATRMERC, OLDLAGTET, PARALLEL, PLCOVCUT, TOLCHK, USA_CAV
Not Supported
Parameter Options (continued)
Material Parameter Control
BULKL, BULKQ, BULKTYP
Analysis/Bulk Viscosity Params
HGCMEM, HGCSOL, HGCTWS, HGCWRP, HGSHELL, HGSOLID
Analysis/Hourglass Params
HVLFAIL, PMINFAIL
Analysis/General Parameters
HGCOEFF, HGTYPE
Not Supported
Shell Options
SHELLFORM, SHELMSYS, SHPLAST, SHTHICK, SLELM
Analysis/General Parameters
Dynamic Relaxation
VDAMP
Analysis/Dynamic Relaxation
ATB Positioning
ATBSEGCREAT
Not Supported
Output Control
ATBAOUT, ATBHOUTPUT, ATBTOUT, AUTHOINFO, CONM2OUT, ELDLTH, FAILOUT, IEEE, INFO-BJOIN, MESHELL, MESHPLN, NASIGN, RBE2INFO, SHSTRDEF, STRNOUT
Analysis/Output Controls
ERRUSR, HICGRAV
Not Supported
Parameter Options (continued)
Pre-Stressing Analysis
INITFILE, INITNAS
Analysis/Initiating Calculation
Initial Metric Method
IMM
Analysis/Initiating Calculation