Abaqus to OptiStruct Conversion Mapping

Care has to be taken so that the element and property mappings are consistent. A valid mapping scheme is provided in the ConfigurationFile.txt file. This document explains the scope and limitations of the mapping scheme.

Contact and Pretension Groups

Contacts
- NLPARM card is automatically created and assigned to a nonlinear quasi-static subcase for models containing contacts.
- *SURFACE INTERACTION property with clearance/pressure versus conductivity is mapped to PCONTHT with TABLED1 cards.
- *MODELCHANGE conversion is supported for both element set and contact group.
- *CONTACT PAIR will be mapped to FINITE when SMALL SLIDING is not defined.
- *CONTACT PAIR will be mapped to its default (SLIDE) when SMALL SLIDING is defined.
- *CONTACT CONTROLS are converted to CNTSTB and is mapped to loadstep.
Bolt Pretension
- *PRETENSION SECTION group maps to a PRETENS entity set with reference to a 1D pretension element or a 3D pretension surface (SURF).
- *CLOAD applied to a pretension node converts to PTFORCE.
- *BOUNDARY applied to a pretension node converts to PTADJST.
- *BOUNDARY, FIXED option in step converts to STATSUB(PRETENS) on a preceding pretension subcase.

Table 1. Supported Contact and Pretension Group Mappings
Abaqus type	HM config, OptiStruct type
*SURFACE (node based)	set, SET
*SURFACE (element based)	contact surface, SURF
*FRICTION	PCONT FRICESL
*CHANGE FRICTION	PCONT+TABLEG
*CONTACT CLEARENCE	CONTACT PAIR+MODCHG
*CONTACT PAIR	group, CONTACT
*CONTACT PAIR,FINITE	CONTACT,CONSLI
*TIE	group, TIE
*TIE (1D)	group, TIE(N2N)
*PRETENSION SECTION	set, PRETENS contact surface, SURF
*SURFACE INTERACTION, Separation, No/Yes	Property, PCONT, Separation, No/Yes
*CONTACT CONTROLS	Load collector, CNTSTB
*MODEL CHANGE	MODCHG
* RIGID BODY	rbody, RBODY
*SHELL TO SOLID COUPLING	Group, TIE
NONSTRUCTURAL MASS	Group, NSML1

Elements

Engineering Solutions elements have two basic attributes – configuration (or config) and type. The "config" defines the basic geometrical shape of an element. For example, tria3 configuration is a 3 node triangular element and hexa8 is an 8-node hexahedral element. The "type" defines the solver specific element type of a particular configuration. For example, the 4-node quadrilateral (quad4) element in Abaqus can be any of the following types: S4, S4R, M3D4, R3D4, and so on. The Element Types panel shows all supported element configurations and their types for a user profile.

For a specific configuration, you can map any supported Abaqus element type to any supported OptiStruct element type, or vice versa. For example, for an Abaqus to OptiStruct direction, several 2-noded element configurations such as spring, rigid, bar2, rid, and so on, are supported. Because all of them are 2-noded elements, conversion across these configurations is also allowed for some element types. For example, CBUSH is of "spring" configuration in the OptiStruct user profile and CONN3D2 is of "rod" configuration in the Abaqus user profile. It is possible to map a CBUSH to CONN3D2 even though their configurations are different. The element mapping scheme must be under the *ElemTypeConversion block in the ConfigurationFile.txt file. You need to provide both configuration and type information to specify the element mapping scheme.

Table 2. Supported Element Mappings
HM configuration	Abaqus	OptiStruct type
Mass	MASS	CONM2
	ROTARYI	CONM2
	SPRING1	CELAS1, CELAS2, CBUSH
	DASHPOT1	CDAMP1
	CONN3D2	CBUSH
	CONN2D2	CBUSH
rigid	BEAM	RBE2
	LINK	RBE2
	PIN	RBE2
	TIE	RBE2
	KINCOUP	RBE2
	COUP_KIN	RBE2
	COUP_DIS	RBE2
	RB3D2	RBE2
	R2D2	RBE2
	RAX2	RBE2
	RB2D2	RBE2
rbe3	DCOUP3D	RBE3
	COUP_DIS	RBE3
	DCOUP2D	RBE3
rigidlink	KINCOUP	RBE2
	RB3D2	RBE2
	BEAM	RBE2
	LINK	RBE2
	PIN	RBE2
	TIE	RBE2
	COUP_KIN	RBE2
	COUP_DIS	RBE3
	R2D2	RBE2
	RAX2	RBE2
	RB2D2	RBE2
spring	SPRING2	CELAS1, CBUSH
	SPRINGA	CBUSH
	DASHPOT2	CDAMP1, CBUSH
	DASHPOTA	CBUSH
	JOINTC	CBUSH
bar2	B31	CBAR,CBEAM
	B31H	CBAR,CBEAM
	B33	CBAR,CBEAM
	B33H	CBAR,CBEAM
	B31OS	CBAR,CBEAM
	B31OSH	CBAR,CBEAM
	PIPE31	CBAR,CBEAM
	PIPE31H	CBAR,CBEAM
	ELBOW31	CBAR,CBEAM
	ELBOW31B	CBAR,CBEAM
	ELBOW31C	CBAR,CBEAM
	AC1D2	CBAR,CBEAM
	GK3D2	CBAR,CBEAM
	GK3D2N	CBAR,CBEAM
	SAX1	CBAR,CBEAM
	B21	CBAR,CBEAM
	B21H	CBAR,CBEAM
	B23	CBAR,CBEAM
	B23H	CBAR,CBEAM
	PIPE21	CBAR,CBEAM
	PIPE21H	CBAR,CBEAM
	F2D2	CBAR,CBEAM
	FAX2	CBAR,CBEAM
bar3	B32	CBAR,CBEAM
	B32H	CBAR,CBEAM
	B32OS	CBAR,CBEAM
	B32OSH	CBAR,CBEAM
	PIPE32	CBAR,CBEAM
	PIPE32H	CBAR,CBEAM
	ELBOW32	CBAR,CBEAM
	AC1D3	CBAR,CBEAM
	MGAX2	CBAR,CBEAM
	SFMAX2	CBAR,CBEAM
	SFMGAX2	CBAR,CBEAM
	SAX2	CBAR,CBEAM
	B22	CBAR,CBEAM
	B22H	CBAR,CBEAM
	PIPE22	CBAR,CBEAM
	PIPE22H	CBAR,CBEAM
rod	T3D2	CROD
	T3D2H	CROD
	T3D2T	CROD
	T3D2E	CROD
	MGAX1	CROD
	SFMAX1	CROD
	SFMGAX1	CROD
	CONN3D2	CBUSH
	T2D2	CROD
	T2D2H	CROD
	T2D2T	CROD
	T2D2E	CROD
	GK2D2	CROD
	GK2D2N	CROD
	CONN2D2	spring CELAS1,CELAS2,CBUSH
gap	GAPUNI	CGAP
	GAPCYL	CGAP
	GAPSPHER	CGAP
tria3	S3	CTRIA3,CTRIAR
	S3R	CTRIA3,CTRIAR
	STRI3	CTRIA3,CTRIAR
	M3D3	CTRIA3,CTRIAR
	SFM3D3	CTRIA3,CTRIAR
	R3D3	CTRIA3,CTRIAR
	DS3	CTRIA3,CTRIAR
	CPE3	CTRIA3,CTRIAR
	CPE3H	CTRIA3,CTRIAR
	CPE3E	CTRIA3,CTRIAR
	CPS3	CTRIA3
	CPS3E	CTRIA3,CTRIAR
	CAX3	CTRIA3,CTRIAR
	CAX3H	CTRIA3,CTRIAR
	CAX3E	CTRIA3,CTRIAR
	CGAX3	CTRIA3,CTRIAR
	CGAX3H	CTRIA3,CTRIAR
	AC2D3	CTRIA3,CTRIAR
	ACAX3	CTRIA3,CTRIAR
	DCAX3	CTRIA3,CTRIAR
	DCAX3E	CTRIA3,CTRIAR
	DC2D3	CTRIA3,CTRIAR
	DC2D3E	CTRIA3,CTRIAR
quad4	S4	CQUAD4,CQUADR
	S4R	CQUAD4,CQUADR
	S4R5	CQUAD4,CQUADR
	M3D4	CQUAD4,CQUADR
	M3D4R	CQUAD4,CQUADR
	SFM3D4	CQUAD4,CQUADR
	SFM3D4R	CQUAD4,CQUADR
	R3D4	CQUAD4,CQUADR
	DS4	CQUAD4,CQUADR
	GK3D4L	CQUAD4,CQUADR
	GK3D4LN	CQUAD4,CQUADR
	F3D4	CQUAD4,CQUADR
	CPE4I	CQUAD4,CQUADR
	CPE4	CQUAD4,CQUADR
	CPE4H	CQUAD4,CQUADR
	CPE4IH	CQUAD4,CQUADR
	CPE4R	CQUAD4,CQUADR
	CPE4RH	CQUAD4,CQUADR
	CPE4T	CQUAD4,CQUADR
	CPE4HT	CQUAD4,CQUADR
	CPE4E	CQUAD4,CQUADR
	CPS4	CQUAD4
	CPS4I	CQUAD4,CQUADR
	CPS4R	CQUAD4,CQUADR
	CPS4T	CQUAD4,CQUADR
	CPS4E	CQUAD4,CQUADR
	CAX4	CQUAD4,CQUADR
	CAX4H	CQUAD4,CQUADR
	CAX4I	CQUAD4,CQUADR
	CAX4IH	CQUAD4,CQUADR
	CAX4R	CQUAD4,CQUADR
	CAX4RH	CQUAD4,CQUADR
	CAX4T	CQUAD4,CQUADR
	CAX4HT	CQUAD4,CQUADR
	CAX4E	CQUAD4,CQUADR
	CAXA4N	CQUAD4,CQUADR
	CAXA4HN	CQUAD4,CQUADR
	CAXA4RN	CQUAD4,CQUADR
	CAXA4RHN	CQUAD4,CQUADR
	CGAX4	CQUAD4,CQUADR
	CGAX4H	CQUAD4,CQUADR
	CGAX4R	CQUAD4,CQUADR
	CGAX4RH	CQUAD4,CQUADR
	AC2D4	CQUAD4,CQUADR
	ACAX4	CQUAD4,CQUADR
	DC2D4	CQUAD4,CQUADR
	DC2D4E	CQUAD4,CQUADR
	DCAX4	CQUAD4,CQUADR
	DCAX4E	CQUAD4,CQUADR
	DCCAX4	CQUAD4,CQUADR
	DCCAX4D	CQUAD4,CQUADR
	GKPS4	CQUAD4,CQUADR
	GKPE4	CQUAD4,CQUADR
	GKPS4N	CQUAD4,CQUADR
tria6	STRI65	CTRIA6
	M3D6	CTRIA6
	SFM3D6	CTRIA6
	DS6	CTRIA6
	CPE6	CTRIA6
	CPE6H	CTRIA6
	CPE6M	CTRIA6
	CPE6MH	CTRIA6
	CPS6	CTRIA6
	CPS6M	CTRIA6
	AC2D6	CTRIA6
	ACAX6	CTRIA6
	DCAX6	CTRIA6
	DC2D6	CTRIA6
	DCAX6E	CTRIA6
	DC2D6E	CTRIA6
	CAX6	CTRIA6
	CAX6H	CTRIA6
	CAX6M	CTRIA6
	CAX6MH	CTRIA6
	CGAX6	CTRIA6
	CGAX6H	CTRIA6
quad8	S8R	CQUAD8
	S8R5	CQUAD8
	S8RT	CQUAD8
	M3D8	CQUAD8
	M3D8R	CQUAD8
	SFM3D8	CQUAD8
	SFM3D8R	CQUAD8
	DS8	CQUAD8
	CPE8	CQUAD8
	CPE8H	CQUAD8
	CPE8R	CQUAD8
	CPE8RH	CQUAD8
	CPS8	CQUAD8
	CPS8R	CQUAD8
	AC2D8	CQUAD8
	ACAX8	CQUAD8
	DC2D8	CQUAD8
	DCAX8	CQUAD8
	DCAX8E	CQUAD8
	DC2D8E	CQUAD8
	CAX8	CQUAD8
	CAX8H	CQUAD8
	CAX8HT	CQUAD8
	CAX8R	CQUAD8
	CAX8RH	CQUAD8
	CAX8RHT	CQUAD8
	CAX8RT	CQUAD8
	CGAX8	CQUAD8
	CGAX8H	CQUAD8
	CGAX8R	CQUAD8
	CGAX8RH	CQUAD8
	CAXA8N	CQUAD8
	CAXA8HN	CQUAD8
	CAXA8PN	CQUAD8
	CAXA8RN	CQUAD8
	CAXA8RHN	CQUAD8
	CAXA8RPN	CQUAD8
tetra4	C3D4	CTETRA
	C3D4H	CTETRA
	C3D4E	CTETRA
	AC3D4	CTETRA
	DC3D4	CTETRA
	DC3D4E	CTETRA
	C3D4T	CTETRA
penta6	AC3D6	CPENTA
	C3D6	CPENTA
	C3D6H	CPENTA
	DC3D6	CGASK6
	DC3D6E	CGASK6
	GK3D6	CPENTA
	GK3D6N	CPENTA
	SC6R	CPENTA
	COH3D6	CPENTA
hex8	C3D8I	CHEXA
	C3D8	CHEXA
	C3D8T	CHEXA
	C3D8H	CHEXA
	C3D8HT	CHEXA
	C3D8IH	CHEXA
	C3D8R	CHEXA
	C3D8RH	CHEXA
	C3D8E	CHEXA
	AC3D8	CHEXA
	DC3D8	CHEXA
	DC3D8E	CHEXA
	DCC3D8	CHEXA
	DCC3D8D	CHEXA
	GK3D8	CGASK8
	GK3D8N	CGASK8
	SC8R	CHEXA
	COH3D8	CIFHEX
tetra10	C3D10	DC3D10
	C3D10H	DC3D11
	C3D10M	DC3D12
	C3D10MH	DC3D13
	C3D10E	DC3D14
	DC3D10E	DC3D15
	AC3D10	DC3D16
	DC3D10	DC3D17
penta15	C3D15H	CPENTA
	C3D15E	CPENTA
	AC3D15	CPENTA
	DC3D15	CPENTA
	DC3D15E	CPENTA
hex20	C3D20	CHEXA
	C3D20H	CHEXA
	C3D20R	CHEXA
	C3D20RH	CHEXA
	C3D20E	CHEXA
	C3D20RE	CHEXA
	C3D20T	CHEXA
	C3D20HT	CHEXA
	C3D20RT	CHEXA
	C3D20RHT	CHEXA5
	DC3D20	CHEXA
	AC3D20	CHEXA
	DC3D20E	CHEXA
Pyramid	C3D8I	CPYRA

Abaqus CONN3D2 connector C3D20R elements are converted to OptiStruct CBUSH, PBUSH or JOINTG using the following guidelines:

Connector1 types converted:
- AXIAL: Active = [1], Rigid = [-]
- CARTESIAN, PROJECTION CARTESIAN: Active = [123], Rigid = [-]
- JOIN: Active = [-], Rigid = [123]
- RADIAL-THRUST: Active = [13]*, Rigid = [-]
  Note: Requires cylindrical system
- SLIDE-PLANE: Active = [23], Rigid = [1]
- SLOT: Active = [1], Rigid = [23]
Connector2 types converted:
- ALIGN: Active = [-], Rigid = [456]
- CARDAN, EULER, ROTATION, FLEXION-TORSION, PROJECTION FLEXION-TORSION: Active = [456], Rigid = [-]
- REVOLUTE: Active = [4], Rigid = [56]
Special assembled Connector1 types:
- BEAM, WELD = (JOIN + ALIGN): Active = [-], Rigid = [123456]
- CYLINDRICAL = (SLOT + REVOLUTE): Active = [14], Rigid = [2356]
- HINGE = (JOIN + REVOLUTE): Active = [4], Rigid = [12356]
- PLANAR = (SLIDE-PLANE + REVOLUTE): Active = [234], Rigid = [156]
- TRANSLATOR = (SLOT + ALIGN): Active = [1], Rigid = [23456]
- BUSHING = (PROJECTION CARTESIAN + PROJECTION FLEXION-TORSION): Active = [123456], Rigid = [-]
PBUSH stiffness and damping values (Ki, Bi) for active DOFs are mapped from *CONNECTOR BEHAVIOR material data. Rigid DOFs map to RIGID option inside PBUSH.
CBUSH orientation is mapped from *CONNECTOR SECTION Orientation system.
- Only 1 Orientation system can be mapped to CBUSH CID.
- If 2 Orientation systems are present in the Abaqus card, Engineering Solutions only maps the first one.

It is possible to use a simplified conversion of Abaqus connectors (CONN3D2) to rbe2 elements when modifying ConfigurationFile.txt in the following way (change the entry for rod element type configuration: rod,CONN3D2 rigid,rbe2

CONN3D2 elements will now be converted to RBE2 elements. Depending on the connection type set in the CONNECTOR SECTION (such as AXIAL or HINGE), degrees of freedom will be set for the RBE2 element. If systems are associated to the connector elemental nodes they will be assigned to the nodes of the RBE2 as well. Not all connection types are supported. If a system is ignored by a particular CONNECTOR SECTION, it will not be assigned to the nodes of the RBE2 either.

These connector types are currently considered in conversion: AXIAL, JOIN, LINK, SLIDE-PLANE, SLOT, ALIGN, REVOLUTE, BEAM, CYLINDRICAL, HINGE, PLANAR, TRANSLATOR, WELD.

*KINEMATIC COUPLING constraints with element based surfaces, currently mapped to groups in Engineering Solutions, are converted into RBE2 rigid elements. *DISTRIBUTING COUPLING constraints are converted to RBE3 elements.

All SPRING and DASHPOT related conversions (including JOINTC) map to CELAS1, CDAMP1, or CBUSH/PBUSH using the following guidelines:

SPRING1/2 without ORIENTATION converts to CELAS1
SPRINGA or SPRING1/2 with ORIENTATION converts to CBUSH/PBUSH/PBUSHT with K/KN lines. For SPRING1/2, ORIENTATION maps to CBUSH, CID.
DASHPOT1/2 without ORIENTATION converts to CDAMP1
DASHPOTA or DASHPOT1/2 with ORIENTATION converts to CBUSH/PBUSH/PBUSHT with B line. For DASHPOT1/2, ORIENTATION maps to CBUSH, CID.
Convertor has an additional option: Convert *SPRING defined with Orientation to CBUSH. If this option is enabled, *SPRING is converted to CBUSH if not enabled to CELAS.

Refer to the following table for Connector Section values:

Connector Section	Values
AXIAL	AXIAL
AXIAL ALIGN	AXIAORIE
AXIAL, ALIGN	AXIAL, ORIENT
BEAM (JOIN + ALIGN)	BALL + ORIENT OR CBUSH, Pbush (RIGID all)
LINK	RROD
LINK ALIGN	RLINORIE
LINK, ALIGN	RROD, ORIENT
JOIN	BALL
JOIN, ROTATION	BALL, CARDAN
HINGE (JOIN + REVOLUTE)	REVOLUTE, BALL
SLOT	INLINE
SLOT CARDEN	INLICARD
CYLINDRICAL (SLOT + REVOLUTE)	INLINE + REVOLUTE
TRANSLATOR (SLOT + ALGIN)	INLINE, ORIENT
CARTESIAN	CARTESIAN
SLIDE-PLANE	INLINE
UJOINT (JOIN + UNIVERSAL)	BALL, UNIVERSAL
HINGE	RBAR + REVOLUTE

Nodal thickness is mapped to respective grid post conversions.

HTML report supported for Joints.

Configuration file paths are selected in batch mode conversion. Conversion options can be used in batch mode conversion by editing the configuration file.

Sectional Properties

Some of the properties in one solver can be converted to two different sections in the other solver. For an Abaqus to OptiStruct conversion, for example, *DASHPOT can be converted to *PELAS or PDAMP. The property mapping scheme can be edited under the *PropertyConversion block in the ConfigurationFile.txt file.

The property conversion scheme and corresponding element conversion scheme must be consistent. For example, if you define *CONNECTOR SECTION to PBUSH at the property mapping scheme, the corresponding element CONN3D2 must map to CBUSH in the element mapping scheme.

For SOLID SECTION the converter will always convert to PSOLID unless the property has a data line indicating a cross-sectional area for a truss element. In this case conversion results in a PROD property.

For BEAM (GENERAL) SECTION the algorithm automatically decides which property to convert to depending on the element type chosen in the ElementTypeConversion section of the ConfigurationFile.txt. For example, if you want to convert B31 elements to CBAR, the beam property will get converted to a PBAR or PBARL property. If you choose to convert B31 elements to CBEAM, then the converter creates PBEAM or PBEAML properties accordingly. The same logic applies to B32 elements; the difference is that they are changed to first order beam elements first on conversion.

Table 3. Supported Sectional Property Mappings
Abaqus type	OptiStruct type
*SURFACE INTERACTION	PCONT
*SURFACE BEHAVIOR, PRESSURE -OVERCLOSURE = EXPONENTIAL	PCONT SOFT YES + STFEXP
*FRICTION	PCONT
*GASKET SECTION	PGASK
*BEAM GENERAL SECTION	PBAR(L), PBEAM(L)
*BEAM SECTION	PBAR(L), PBEAM(L)
*COHESIVE SECTION	PCOHE, MCOHE
*CONNECTOR SECTION	JOINTG
*CONNECTOR SECTION-JOIN	JOINTG-BALL
*CONNECTOR SECTION-REVOLUTE	JOINTG-REVOLUTE
*CONNECTOR SECTION-UNIVERSAL	JOINTG-UNIVERSAL
*DASHPOT	PELAS,PDAMP
*GAP	PGAP
*MASS	CONM2
*MEMBRANE SECTION	PSHELL
*ROTARY INERTIA	CONM2
*RIGID BODY	RBODY(GPAD=NONE)
*SHELL GENERAL SECTION	PSHELL
*SHELL GENERAL SECTION	PSHELL
*SHELL SECTION	PSHELL
*SOLID SECTION	PSOLID
*SPRING	PELAS, PBUSH, PBUSHT
*SOLID SECTION (Homogeneous)	PROD
*SHELL SECTION(SC8R)	PCOMPLS
*SHELL GENERAL SECTION (Homogeneous)	PSHELL
*SHELL GENERAL SECTION (User)	PSHELL
*SHELL SECTION (Composite)	PCOMP, PCOMPG
*SHELL SECTION COMPOSITE	Property, PCOMPLS
*SHELL GENERAL SECTION (Composite)	PCOMP, PCOMPG

Materials

The material mapping scheme can be edited under *PropertyConversion block in the ConfigurationFile.txt file.

Table 4. Supported Material Mappings
Abaqus type		OptiStruct type
*MATERIAL	*CONDUCTIVITY	MAT4, K
	*ELASTIC, ISOTROPIC	MAT1
	*ELASTIC, ISOTROPIC E, poisson's ratio, T	MATT1 with TABLEM1 for E and poisson's ratio
	*ELASTIC, LAMINA	MAT8
	Gasket Material	MGASK,TABLEG
	*HYPERELASTIC	MATHE((uniaxial,biaxial,shear and volumetric)
	*PLASTIC stress (x), plastic strain (y)	MATS1 with TYPSTRN=1 for plastic strain. TABLES1 with stress (y) vs plastic strain (x)
	*PLASTIC stress (x), plastic strain (y), Temp	For each T, need a separate TABLES1. TABLEST to define T and corresponding TABLES1.
	*SPECIFIC HEAT	MAT4, CP, M4ATT
	*EXPANSION expansion coeff, T	MATT1 with TABLEM1 for expansion coeff (A)
	*ELASTIC TYPE=ENGINEERING CONSTANTS	MAT8
*GASKET BEHAVIOR	*GASKET ELASTICITY, COMPONENT = MEMBRANE	MGASK + MAT1
	*GASKET ELASTICITY, COMPONENT = TRANSVERSE SHEAR	MGASK + MAT1 GPL field of MGASK card
	*GASKET THICKNESS BEHAVIOR, DIRECTION = LOADING pressure (x), closure (y)	TABLES1 curve with pressure (y) vs closure (x) definition TABLES1 referred in TABLED field of MGASK
	*GASKET THICKNESS BEHAVIOR, DIRECTION = LOADING for TYPE = ELASTO-PLASTIC	BEHAV = 0 in MGASK
	*GASKET THICKNESS BEHAVIOR, DIRECTION = LOADING for TYPE = DAMAGE	BEHAV = 1 in MGASK
	*GASKET THICKNESS BEHAVIOR, DIRECTION=LOADING for TYPE = DAMAGE or ELASTO-PLASTIC with TENSILE STIFFNESS FACTOR	EPL in MGASK
	*GASKET THICKNESS BEHAVIOR, DIRECTION = UNLOADING pressure, closure, Max closure	For "n" max/plastic closure values, creates "n" TABLES1 for individual unloading pressure vs closure curves. TABLES1 referred in TABLU1 TABLUn fields in MGASK.
	*EXPANSION expansion coeff, T
*MATERIAL	*CONDUCTIVITY	MATT4,TABLEM1
*MATERIAL	*HYPERELASTIC, MOONEY, RIVLIN, REDUCED, POLYNOMIAL, ARRUDA, BOYCE, YEOH, NEO HOOKE	MATHE, MOONEY, RIVLIN, REDUCED, POLYNOMIAL, ARRUDA, BOYCE, YEOH, NEO HOOKE
*MATERIAL		MATERIAL
*CREEP		MATVP
*VISCOELASTIC		MATVE
HYPERELASTIC+VISCOELASTIC		MATHE+MATVE
*Hyperfoam (uniaxial,biaxial and planar test data)		MATHE, FOAM (tab1,tab2 and tab4)
*ELASTIC, TYPE = ENGINEERING CONSTANTS		MAT9ORT
*CONNECTOR BEHAVIOR		PBUSH, PELAS

Table 5. Connector Section
Connector Section	Values
ROTATION	ROTATION
CARTESIAN,ROTATION	CARTROTA
PLANE,ALIGN	INPLORIE
SLOT, ALIGN	TRANSLAT
JOIN	RPIN
JOIN,ROTAION	RPINROTA

Loads

HM loads have two basic attributes – configuration (or config) and type. The supported load "configs" are: force, moment, constraint, pressure, temperature, flux, velocity, acceleration and equation. The load "type" defines the solver specific type of a particular configuration. For example, pressure load can be any of the following OptiStruct types: PLOAD, PLOAD2, or PLOAD4. The Load Types panel shows all supported load configurations and their types for a user profile.

The converter also converts distributed surfaces loads (*DLSOAD) applied on faces of shell or solid elements into pressure loads (PLOAD4).

Temperature with *INTIAL condition is converted to TEMP(INTIAL) and mapped to Global Case Control.

FILM loads are converted to CHBDYE elements, sink temperatures are converted to SPC and heat transfer coefficient(H) with PCONV.

SFILM loads are converted to CHBDYE elements, sink temperatures are converted to SPC and heat transfer coefficient(H) with PCONV.

Distributed surfaces loads (*DLSOAD) applied on faces of shell or solid elements into pressure loads (PLOAD4).

For a specific configuration, you can map any supported Abaqus load type to any supported OptiStruct load type. The conversion tool does not support conversion across load configurations. The load mapping scheme can be edited under the *BCsTypeConversion block in the ConfigurationFile.txt file. You need to provide both configuration and type information to specify the mapping scheme.

Abaqus *connector behavior STOP/LOCK with Elastic/Non-linear/RIGID convert to PJOINTG with STOP/LOCK with ELAS/NLELAS/RIGID.

Table 6. Supported Load Mappings
HM configuration	Abaqus type	OptiStruct type
temperature	TEMPERATURE	TEMP
pressure	DLOAD	PLOAD,PLOAD2,PLOAD4
pressure	*DLOAD,P	PLOADSF
pressure	*DLOAD,P1-P6	PLOADSF
pressure	DLOAD,ROTA	RACC
pressure	*DLOAD,TRSHR	PLOADSF
pressure	*DLOAD,TRVEC	PLOADSF
pressure	*DSLOAD	PLOADSF
pressure	CENTRIFUGAL	RFORCE
pressure	FILM	SPC
	SFILM	SPC
	DFLUX	QBDY1
Constraint	ACCELERATION	SPCD
	VELOCITY	SPCD
	BOUNDARY	SPC,SUPORT
	BOUNDARY on pretension node	PTADJST
moment	CLOAD	MOMENT
force	CLOAD	FORCE
force	CLOAD on pretension node	PTFORCE
equation	EQUATION	MPC
temperature	BOUNDARY	SPC
Connector Load	CONNECTOR LOAD	LOADJG
Connector Motion	CONNECTOR MOTION	MOTIONJG

Sets

Table 7. Supported Set Mappings
Abaqus type	OptiStruct type
*NSET	SET
*ELSET	SET

Control Cards

Node set and element set from output block for displacement and stress are mapped.
PARAM, INREL, -2 is created if there is *INERTIA RELIEF in the OptiStruct deck.
PARAM, RBE3COL is created if there are rbe3 elements in the OptiStruct deck.
Displacement, Stress and Contact pressure output card is created on conversion and is mapped to respective loadstep.
Node set and element set from output block for displacement and stress are mapped if mapped to step.
PARAM,INREL,-2 is created if there is *INERTIA RELIEF in the Abaqus deck.
PARAM,RBE3COL is created if there are rbe3 elements in the Abaqus deck.
*PREPRINT,CONTACT=YES to OptiStruct CONTPRM,PREPRT,YES.
If OUTPUTBLOCK is not mapped to any loadstep these are updated in GLOBAL CASE CONTROL.
*RESTART,WRITE,OVRELAY is converted to OS RESTARTW= 1 ,COVER

Systems

Table 8. Supported System Mappings
Abaqus type	OptiStruct type
*ORIENTATION	CORD2C,CORD2R,CORD2S
*SYSTEM	CORD2C,CORD2R,CORD2S
*TRANSFORM	CORD2C,CORD2R,CORD2S
*TRANSFORM- USER DEFINED NSET	CORD2C,CORD2R,CORD2S

Load Steps and Analysis Type

The conversion tool maps between Abaqus steps and OptiStruct subcases. It does not convert Abaqus analysis types to the solution type. You must define it manually using the Loadsteps Browser.

The converter converts *STEP into respective supported SUBCASE. Load collector references are maintained upon conversion. If multiple load collectors of a particular step have constraints, an SPCADD card is created automatically. Similarly, a LOAD card is created for homogeneous loads and mapped to step.

For models containing contacts, NLPARM card is automatically created and assigned to a nonlinear quasi-static subcase.

Abaqus models that contain both conductivity and temperature defined under *CONDUCTIVITY in *MATERIAL is converted to a non-linear Heat transfer (NLHEAT) analysis type in OptiStruct.

NLGEOM is set to YES in a loadstep with id 'i', CNTNLSUB will be set checked on, OPTION set to YES and SCID points to the previous loadstep in loadstep with id 'i+1'. The chain continues for the loadsteps.

*PERTURBUTION steps are converted to linear static.

*FREQUENCY RESIDUAL=YES is converted to RESVEC=YES on conversion.

*FREQUENCY (analysis type) is converted to normal modes with the EIGRL card (load collector) mapped in the loadstep on conversion.

*SELECTEIGENMODES converted OptiStruct MODESELECT.

SUBCASE (MONITOR) converted to MONITOR and updated in the Loadstep.

*STATIC load step wuth Int_INC is mapped to NLPARM load collector with NINC=1/Int_INC.

*STATIC load step with MinIcr is mapped to NLADAPT,DTMIN load collector.

*STATIC load step with MaxIncr is mapped to NLADAPT,DTMAX load collector.

*STEP with unsymm=yes is converted to PARAM, UNSYMSLV.

*ENDLOADCASE conversion supported.

Dynamic NLGEOM=yes to Transient Nonlinear analysis.

*HEADER in the include file is moved to master include on conversion

*TIMEPOINTS converted to NLOUT, TIME,SET,<NUM>,time, list.

Joints

Table 9. Supported Joint Mappings
Abaqus type	OptiStruct type
*CONNECTOR DAMPING	PJOINTG,DAMP
*CONNECTOR JOIN	RPIN