MP
MP, Lab, MAT, C0, C1, C2, C3, C4
Defines a linear material property as a constant or a function of temperature.
MP ME ST PR PRN DS DSS FL EM EH DY PP <> EME MFS
Lab

Valid material property label. Applicable labels are listed under "Material Properties" in the input table for each element type in the Element Reference. See Linear Material Properties in the Material Reference for more complete property label definitions:

EX — 

Elastic moduli (also EY, EZ).

ALPX — 

Secant coefficients of thermal expansion (also ALPY, ALPZ).

CTEX — 

Instantaneous coefficients of thermal expansion (also CTEY, CTEZ).

THSX — 

Thermal strain (also THSY, THSZ).

REFT — 

Reference temperature. Must be defined as a constant; C1 through C4 are ignored.

PRXY — 

Major Poisson's ratios (also PRYZ, PRXZ).

NUXY — 

Minor Poisson's ratios (also NUYZ, NUXZ).

GXY — 

Shear moduli (also GYZ, GXZ).

ALPD — 

Mass matrix multiplier for damping.

BETD — 

Stiffness matrix multiplier for damping.


Note:

If used in an explicit dynamic analysis, the value corresponds to the percentage of damping in the high frequency domain. For example, 0.1 roughly corresponds to 10% damping in the high frequency domain.

DMPR — 

Constant material damping coefficient.

MU — 

Coefficient of friction.

DENS — 

Mass density.

C — 

Specific heat.

ENTH — 

Enthalpy.

KXX — 

Thermal conductivities (also KYY, KZZ).

HF — 

Convection or film coefficient.

EMIS — 

Emissivity.

QRATE — 

Heat generation rate for thermal mass element MASS71. Fraction of plastic work converted to heat (Taylor-Quinney coefficient) for coupled-field elements PLANE223, SOLID226, and SOLID227.

VISC — 

Viscosity.

SONC — 

Sonic velocity.

RSVX — 

Electrical resistivities (also RSVY, RSVZ).

PERX — 

Electric relative permittivities (also PERY, PERZ).


Note:

If you enter permittivity values less than 1 for SOLID5, PLANE13, or SOLID98, the program interprets the values as absolute permittivity. Values input for PLANE223, SOLID226, or SOLID227 are always interpreted as relative permittivity.

MURX — 

Magnetic relative permeabilities (also MURY, MURZ).

MGXX — 

Magnetic coercive forces (also MGYY, MGZZ).

LSSM — 

Magnetic loss tangent.

LSST — 

Electric loss tangent.

SBKX — 

Seebeck coefficients (also SBKY, SBKZ).

DXX — 

Diffusion coefficients (also DYY, DZZ)

CSAT — 

Saturated concentration

CREF — 

Reference concentration (may not be temperature dependent)

BETX — 

Coefficient of diffusion expansion (also BETY, BETZ)

MAT

Material reference number to be associated with the elements (defaults to the current MAT setting [MAT]).

C0

Material property value, or if a property-versus-temperature polynomial is being defined, the constant term in the polynomial. C0 can also be a table name (%tabname%); if C0 is a table name, C1 through C4 are ignored.

C1, C2, C3, C4

Coefficients of the linear, quadratic, cubic, and quartic terms, respectively, in the property-versus-temperature polynomial. Leave blank (or set to zero) for a constant material property.

Notes

MP defines a linear material property as a constant or in terms of a fourth order polynomial as a function of temperature. (See the TB command for nonlinear material property input.) Linear material properties typically require a single substep for solution, whereas nonlinear material properties require multiple substeps; see Linear Material Properties in the Material Reference for details.

If the constants C1 - C4 are input, the polynomial

Property = C0 + C1(T) + C2(T)2 + C3(T)3 + C4(T)4

is evaluated at discrete temperature points with linear interpolation between points (that is, a piecewise linear representation) and a constant-valued extrapolation beyond the extreme points. First-order properties use two discrete points (±9999°). The MPTEMP or MPTGEN commands must be used for second and higher order properties to define appropriate temperature steps. To ensure that the number of temperatures defined via the MPTEMP and MPTGEN commands is minimally sufficient for a reasonable representation of the curve, ANSYS generates an error message if the number is less than N, and a warning message if the number is less than 2N. The value N represents the highest coefficient used; for example, if C3 is nonzero and C4 is zero, a cubic curve is being used which is defined using 4 coefficients so that N = 4.

A polynomial input is not valid in an explicit dynamic analysis or for Lab = ALPD and BETD. C1, C2, C3, and C4 are ignored.

The use of tabular material properties (C0 = %tabname%) is available only for FLUID116. Fluid properties can be evaluated as a function of pressure, temperature, velocity, time, and location (independent variables). Use the *DIM command to create the table of property values as a function of the independent variables. Then refer to this table via the MP command for the property. If using temperature or pressure independent variables, you need to activate the appropriate pressure or temperature degrees of freedom on the element. Tabular material properties are calculated before the first iteration (that is, using initial values [IC]). For more information about using table-type array parameters, see the discussion on applying tabular boundary conditions in the Basic Analysis Guide.

When defining a reference temperature (MP,REFT), you can convert temperature-dependent secant coefficients of thermal expansion (SCTE) data from the definition temperature to the reference temperature. To do so, issue the MPAMOD command.

This command is also valid in SOLUTION.

Product Restrictions

Command Option LabAvailable Products
ALPD MP ME ST <> <> <> <> <> <> <> DY PP <> EME MFS
ALPX MP ME ST PR PRN DS DSS <> <> <> DY PP <> EME MFS
ALPY MP ME ST PR PRN DS DSS <> <> <> DY PP <> EME MFS
ALPZ MP ME ST PR PRN DS DSS <> <> <> DY PP <> EME MFS
BETDMP ME ST <> <> <> <> <> <> <> DY PP <> EME MFS
BETXMP ME <> <> <> <> <> <> <> <> <> PP <> EME MFS
BETYMP ME <> <> <> <> <> <> <> <> <> PP <> EME MFS
BETZMP ME <> <> <> <> <> <> <> <> <> PP <> EME MFS
CREFMP ME <> <> <> <> <> <> <> <> <> PP <> EME MFS
CSATMP ME <> <> <> <> <> <> <> <> <> PP <> EME MFS
DXXMP ME <> <> <> <> <> <> <> <> <> PP <> EME MFS
DYYMP ME <> <> <> <> <> <> <> <> <> PP <> EME MFS
DZZMP ME <> <> <> <> <> <> <> <> <> PP <> EME MFS
C MP ME ST PR PRN DS DSS <> <> <> DY PP <> EME MFS
CTEX MP ME ST PR PRN DS DSS <> <> <> DY PP <> EME MFS
CTEY MP ME ST PR PRN DS DSS <> <> <> DY PP <> EME MFS
CTEZ MP ME ST PR PRN DS DSS <> <> <> DY PP <> EME MFS
DENS MP ME ST PR PRN DS DSS <> <> EH DY PP <> EME MFS
DMPR MP ME ST PR PRN <> <> <> <> <> DY PP <> EME MFS
EMIS MP ME ST PR PRN DS DSS <> <> <> DY PP <> EME MFS
ENTH MP ME ST PR PRN DS DSS <> <> <> DY PP <> EME MFS
EX MP ME ST PR PRN DS DSS <> <> <> DY PP <> EME MFS
EY MP ME ST PR PRN DS DSS <> <> <> DY PP <> EME MFS
EZ MP ME ST PR PRN DS DSS <> <> <> DY PP <> EME MFS
GXY MP ME ST PR PRN DS DSS <> <> <> DY PP <> EME MFS
GXZ MP ME ST PR PRN DS DSS <> <> <> DY PP <> EME MFS
GYZ MP ME ST PR PRN DS DSS <> <> <> DY PP <> EME MFS
HF MP ME ST PR PRN DS DSS <> <> <> DY PP <> EME MFS
KXX MP ME ST PR PRN DS DSS <> <> <> DY PP <> EME MFS
KYY MP ME ST PR PRN DS DSS <> <> <> DY PP <> EME MFS
KZZ MP ME ST PR PRN DS DSS <> <> <> DY PP <> EME MFS
LSSM MP <> <> <> <> <> <> <> EM EH <> PP <> EME <>
LSST MP ME <> <> <> <> <> <> EM EH <> PP <> EME MFS
MGXX MP ME <> <> <> <> <> <> EM <> DY PP <> EME MFS
MGYY MP ME <> <> <> <> <> <> EM <> DY PP <> EME MFS
MGZZ MP ME <> <> <> <> <> <> EM <> DY PP <> EME MFS
MU MP ME ST <> PRN <> <> <> <> <> DY PP <> EME MFS
MURX MP ME ST PR PRN DS DSS FL EM EH DY PP <> EME MFS
MURY MP ME ST PR PRN DS DSS FL EM EH DY PP <> EME MFS
MURZ MP ME ST PR PRN DS DSS FL EM EH DY PP <> EME MFS
NUXY MP ME ST PR PRN DS DSS <> <> <> DY PP <> EME MFS
NUXZ MP ME ST PR PRN DS DSS <> <> <> DY PP <> EME MFS
NUYZ MP ME ST PR PRN DS DSS <> <> <> DY PP <> EME MFS
PERX MP ME <> <> <> <> <> FL EM EH DY PP <> EME MFS
PERY MP ME <> <> <> <> <> FL EM EH DY PP <> EME MFS
PERZ MP ME <> <> <> <> <> FL EM EH DY PP <> EME MFS
PRXY MP ME ST PR PRN DS DSS FL <> <> DY PP <> EME MFS
PRXZ MP ME ST PR PRN DS DSS FL <> <> DY PP <> EME MFS
PRYZ MP ME ST PR PRN DS DSS FL <> <> DY PP <> EME MFS
QRAT MP ME ST PR PRN DS DSS <> EM <> DY PP <> EME MFS
REFT MP ME ST PR PRN DS DSS <> <> <> DY PP <> EME MFS
RSVX MP ME ST PR PRN DS DSS FL EM EH DY PP <> EME MFS
RSVY MP ME ST PR PRN DS DSS FL EM EH DY PP <> EME MFS
RSVZ MP ME ST PR PRN DS DSS FL EM EH DY PP <> EME MFS
SBKXMP ME <> <> <> <> <> <> EM <> <> PP <> EME MFS
SBKY MP ME <> <> <> <> <> <> EM <> <> PP <> EME MFS
SBKZMP ME <> <> <> <> <> <> EM <> <> PP <> EME MFS
SONCMP ME <> <> <> <> <> FL <> <> DY PP <> EME MFS
THSXMP ME ST <> <> <> <> FL <> <> DY PP <> EME MFS
THSYMP ME ST <> <> <> <> FL <> <> DY PP <> EME MFS
THSZMP ME ST <> <> <> <> FL <> <> DY PP <> EME MFS
VISCMP ME ST <> <> <> <> FL <> <> DY PP <> EME MFS

Menu Paths

Main Menu>Preprocessor>Loads>Load Step Opts>Other>Change Mat Props>Material Models
Main Menu>Preprocessor>Material Props>Material Models
Main Menu>Solution>Load Step Opts>Other>Change Mat Props>Material Models

Release 14.0 - © 2011 SAS IP, Inc. All rights reserved.