Supported design variables for model update solution process

The Model Update solution process supports the Simcenter Nastran formats of DESVAR, DVPREL1, and DVMREL1 cards.

Material properties

The following table shows which material property entries are supported as design variables in the Model Update solution process when you use the Design Variable — Material modeling object.

Material type	Card Type	Material Field (MPNAME)	Description
Isotropic	MAT1 NOTE	E	Young's modulus
G	Shear modulus
NU	Poisson's ratio
RHO	Mass density
A	Coefficient of thermal expansion
TREF	Reference temperature
GE	Structural element damping coefficient
Orthotropic	MAT3	EX, ETH, EY	Modulus of elasticity in the X, θ, and Z directions
NUXTH, NUTHZ, NUZX	Poisson's ratio in the X-θ, θ-Z, and Z-X directions
RHO	Mass density
GZX	Shear modulus
AX,ATH,AZ	Coefficient of thermal expansion in the X, θ, and Z directions
TREF	Reference temperature
GE	Structural element damping coefficient
MAT8	E1, E2	Modulus of elasticity in directions 1 and 2
NU12	Poisson's ratio
G12, G1Z, G2Z	Shear modulus in the 1-2, 1-Z, and 2-Z directions
RHO	Mass density
A1, A2	Coefficient of thermal expansion in directions 1 and 2
TREF	Reference temperature
XT, YT	Maximum stress or strain tension in directions 1 and 2
XC, YC	Maximum stress or strain compression in directions 1 and 2
S	Maximum in-plane shear stress or strain
GE	Structural element damping coefficient
Anisotropic	MAT2	G11, G12, G13, G22, G23, G33	Shear modulus in the 1-1, 1-2, 1-3, 2-2, 2-3, and 3-Z directions
RHO	Mass density
A1, A2, A3	Coefficient of thermal expansion in directions 1, 2, and 3
TREF	Reference temperature
GE	Structural element damping coefficient
MAT9	G11, G12, G13, G14, G15, G16G22, G23, G24, G25, G26G33, G34, G35, G36G44, G45, G46G55, G56G66	Elements of the 6 x 6 symmetric material property matrix in the material coordinate system
RHO	Mass density
A1, A2, A3, A4, A5, A6	Six coefficients of thermal expansion
TREF	Reference temperature
GE	Structural element damping coefficient
Fluid	MAT10	BULK	Bulk modulus
RHO	Mass density
C	Speed of sound
GE	Fluid element damping coefficient

Physical properties

The following table shows which physical property entries are supported as design variables in the Model Update solution process when you use the Design Variable — Property modeling object.

Physical property type	Physical Field (PNAME)	Description
PBAR	A	Area
I1, I2	Area moments of inertia in directions 1 and 2
I12	Inertia cross product
J	Torsional constant
NSM	Non-structural mass per unit length
K1, K2	Shear area factors
PBARL	NSM	Non-structural mass per unit length
PBEAM	A(A), A(B)	Area of ends A and B
I1(A), I2(A)I1(B), I2(B)	Area moments of inertia in directions 1 and 2 of ends A and B
I12(A), I12(B)	Inertia cross product of ends A and B
J(A), J(B)	Torsional constant of ends A and B
NSM(A), NSM(B)	Non-structural mass per unit length of ends A and B
CW(A), CW(B)	Warping coefficient of ends A and B
N1(A), N2(A)N1(B), N2(B)	Coordinates of neutral axis of ends A and B
PBEAML	NSM(A), NSM(B)	Non-structural mass per unit length of ends A and B
PBUSH	K1, K2, K3, K4, K5, K6	Six coefficients of spring stiffness
B1, B2, B3, B4, B5, B6	Six coefficients of viscous damping
GE1	Nominal structural damping coefficient
SA	Translational stress recovery coefficient
ST	Rotational stress recovery coefficient
EA	Translational strain recovery coefficient
ET	Rotational strain recovery coefficient
PDAMP	B1	Viscous damping extension or viscous damping rotation
PELAS	K1	Translational stiffness or rotational stiffness
GE1	Damping coefficient
S1	Stress coefficient
PGAP	U0	Initial gap opening
F0	Preload
KA	Closed gap axial stiffness
KB	Open gap axial stiffness
KT	Closed gap transverse stiffness
MU1	Static friction coefficient in the Y direction
MU2	Kinetic friction coefficient in the Z direction
PMASS	M1	Mass or inertia
PROD	A	Area
J	Torsional constant
C	Torsional stress coefficient
NSM	Non-structural mass per unit length
PSHEAR	T	Element thickness
NSM	Non-structural mass per unit area
F1	Effectiveness factor for extensional stiffness on edges 1-2 and 3-4
F2	Effectiveness factor for extensional stiffness on edges 2-3 and 1-4
PSHELL	T	Element thickness
12I/T**3	Bending moment of inertia ratio
TS/T	Transverse shear thickness ratio
NSM	Non-structural mass per unit area
Z1, Z2	Fiber distance for stress calculations in directions 1 and 2
PTUBE	OD	Outer diameter
T	Thickness
NSM	Non-structural mass per unit length
PVISC	CE1	Viscous damping extension
CR1	Viscous damping rotation

The following table shows which physical property entries are supported as design variables in the Model Update solution process when you use the Design Variable — Composite Property modeling object. For the Laminate physical property table, you specify the options that define the physical fields in the Laminate Modeler dialog box.

Physical property type	Physical Field (PNAME)	Description
PCOMP	Z0	Distance from the reference plane to the bottom surface
NSM	Non-structural mass per unit area
SB	Allowable interlaminar shear stress
TREF	Reference temperature
GE	Damping coefficient
Ti	Thickness of ply i
THETAiNote	Orientation angle of the longitudinal direction of ply i with the material axis of the element.
Laminate	Z0	Distance from the reference plane to the bottom surface that you set in the Bottom Fiber Distance box in the Laminate Properties group
NSM	Non-structural mass per unit area that you set in the Nonstructural Mass box in the Solver Properties group
SB	Allowable interlaminar shear stress that you set in the Allowable Stress For Bonding box in the Laminate Properties group
TREF	Reference temperature that you set in the Reference Temperature box in the Laminate Properties group
GE	Damping coefficient that you set in the Damping coefficient box in the Solver Properties group
Ti	Thickness of ply i that you set in the Thickness box in the Ply Layup tab
THETAiNote	Orientation angle of the longitudinal direction of ply i with the material axis of the element that you set in the Angle box in the Ply Layup tab

Note:

Nastran does not export design variables with values set to zero. If the starting value for the ply orientation angle is 0°, change the value to 360°.

How do I

Create design variables for the model update solution process

Create multiple physical design variables

Create the work solution for the model update solution process

Solve the work solution for the model update solution process

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Work solution for the model update solution process

Create Multiple Design Variables

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Supported design variables for model update solution process, Simcenter 3D 2021.1 Series

© 2020 Siemens

The properties E, G, and NU defined in the MAT1 card are mathematically related. When one of these is a design variable, either one of the other two should be left blank in order to respect the isotropic relation after update.

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