MP

MP, Lab, MAT, C0, C1, C2, C3, C4
Defines a linear material property as a constant or a function of temperature.

Compatible Products: DesSpc | Pro | Premium | Enterprise | Ent PP | Ent Solver | DYNA

Lab

Valid material property label. Applicable labels are listed under "Material Properties" in the input table for each element type in the Element Reference.

ALPD

 — 

Mass matrix multiplier for damping.

ALPX

 — 

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

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.


BETX

 — 

Coefficient of diffusion expansion (also BETY, BETZ)

BVIS

 — 

Bulk viscosity

C

 — 

Specific heat

CREF

 — 

Reference concentration (may not be temperature dependent)

CSAT

 — 

Saturated concentration

CTEX

 — 

Instantaneous coefficients of thermal expansion (also CTEY, CTEZ)

CVH

 — 

Heat coefficient at constant volume per unit of mass

DENS

 — 

Mass density.

DMPR

 — 

Constant structural damping coefficient in harmonic analysis (full and QRDAMP mode-superposition). Damping ratio in non-QRDAMP mode-superposition analysis. As a constant structural damping coefficient, it is also supported in transient analyses (full and QRDAMP mode-superposition) when an average excitation frequency is specified (DMPSFreq on TRNOPT).

DXX

 — 

Diffusivity coefficients (also DYY, DZZ)

EMIS

 — 

Emissivity.

ENTH

 — 

Enthalpy.

EX

 — 

Elastic moduli (also EY, EZ)

GXY

 — 

Shear moduli (also GYZ, GXZ)

HF

 — 

Convection or film coefficient

KXX

 — 

Thermal conductivities (also KYY, KZZ)

LSST

 — 

Electric loss tangent

LSSM

 — 

Magnetic loss tangent

MGXX

 — 

Magnetic coercive forces (also MGYY, MGZZ)

MURX

 — 

Magnetic relative permeabilities (also MURY, MURZ)

MU

 — 

Coefficient of friction

NUXY

 — 

Minor Poisson's ratios (also NUYZ, NUXZ) (NUXY = νyx, as described in Stress-Strain Relationships in the Mechanical APDL Theory Reference)

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.


PRXY

 — 

Major Poisson's ratios (also PRYZ, PRXZ) (PRXY = νxy, as described in Stress-Strain Relationships in the Mechanical APDL Theory Reference)

QRATE

 — 

Heat generation rate for thermal mass element MASS71. Fraction of plastic work converted to heat (Taylor-Quinney coefficient) for coupled-field elements PLANE222, PLANE223, SOLID226, and SOLID227.

REFT

 — 

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

RH

 — 

Hall Coefficient.

RSVX

 — 

Electrical resistivities (also RSVY, RSVZ).

SBKX

 — 

Seebeck coefficients (also SBKY, SBKZ).

SONC

 — 

Sonic velocity.

THSX

 — 

Thermal strain (also THSY, THSZ).

VISC

 — 

Viscosity.

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.

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.

Some elements (for example, FLUID116) support tabular input for material properties. Use the *DIM command to create the table of property values as a function of the independent variables. Then input this table name (C0 = %tabname%) when defining the property via the MP command. Tabular material properties are calculated before the first iteration (that is, using initial values [IC]). For a list of elements that support tabular material properties and associated primary variables, see Defining Materials Using TABLE Type Array Parameters in the Mechanical APDL 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 – | – | Premium | Enterprise | Ent PP | Ent Solver | DYNA
ALPX DesSpc | Pro | Premium | Enterprise | Ent PP | Ent Solver | DYNA
ALPY DesSpc | Pro | Premium | Enterprise | Ent PP | Ent Solver | DYNA
ALPZ DesSpc | Pro | Premium | Enterprise | Ent PP | Ent Solver | DYNA
BETD– | – | Premium | Enterprise | Ent PP | Ent Solver | DYNA
BETX– | Pro | Premium | Enterprise | Ent PP | Ent Solver | DYNA
BETY– | Pro | Premium | Enterprise | Ent PP | Ent Solver | DYNA
BETZ– | Pro | Premium | Enterprise | Ent PP | Ent Solver | DYNA
BVIS– | Pro | Premium | Enterprise | Ent PP | Ent Solver | –
CREF– | Pro | Premium | Enterprise | Ent PP | Ent Solver | DYNA
CSAT– | Pro | Premium | Enterprise | Ent PP | Ent Solver | DYNA
DXX– | Pro | Premium | Enterprise | Ent PP | Ent Solver | DYNA
DYY– | Pro | Premium | Enterprise | Ent PP | Ent Solver | DYNA
DZZ– | Pro | Premium | Enterprise | Ent PP | Ent Solver | DYNA
CDesSpc | Pro | Premium | Enterprise | Ent PP | Ent Solver | DYNA
CTEXDesSpc | Pro | Premium | Enterprise | Ent PP | Ent Solver | DYNA
CTEYDesSpc | Pro | Premium | Enterprise | Ent PP | Ent Solver | DYNA
CTEZDesSpc | Pro | Premium | Enterprise | Ent PP | Ent Solver | DYNA
CVH– | Pro | Premium | Enterprise | Ent PP | Ent Solver | –
DENSDesSpc | Pro | Premium | Enterprise | Ent PP | Ent Solver | DYNA
DMPR– | – | Premium | Enterprise | Ent PP | Ent Solver | DYNA
EMISDesSpc | Pro | Premium | Enterprise | Ent PP | Ent Solver | DYNA
ENTHDesSpc | Pro | Premium | Enterprise | Ent PP | Ent Solver | DYNA
EXDesSpc | Pro | Premium | Enterprise | Ent PP | Ent Solver | DYNA
EYDesSpc | Pro | Premium | Enterprise | Ent PP | Ent Solver | DYNA
EZDesSpc | Pro | Premium | Enterprise | Ent PP | Ent Solver | DYNA
GXYDesSpc | Pro | Premium | Enterprise | Ent PP | Ent Solver | DYNA
GXZDesSpc | Pro | Premium | Enterprise | Ent PP | Ent Solver | DYNA
GYZ DesSpc | Pro | Premium | Enterprise | Ent PP | Ent Solver | DYNA
HFDesSpc | Pro | Premium | Enterprise | Ent PP | Ent Solver | DYNA
KXX DesSpc | Pro | Premium | Enterprise | Ent PP | Ent Solver | DYNA
KYYDesSpc | Pro | Premium | Enterprise | Ent PP | Ent Solver | DYNA
KZZDesSpc | Pro | Premium | Enterprise | Ent PP | Ent Solver | DYNA
LSSM– | – | – | Enterprise | Ent PP | Ent Solver | –
LSST – | – | – | Enterprise | Ent PP | Ent Solver | –
MGXX – | – | – | Enterprise | Ent PP | Ent Solver | DYNA
MGYY – | – | – | Enterprise | Ent PP | Ent Solver | DYNA
MGZZ – | – | – | Enterprise | Ent PP | Ent Solver | DYNA
MU – | Pro | Premium | Enterprise | Ent PP | Ent Solver | DYNA
MURX DesSpc | Pro | Premium | Enterprise | Ent PP | Ent Solver | DYNA
MURY DesSpc | Pro | Premium | Enterprise | Ent PP | Ent Solver | DYNA
MURZ DesSpc | Pro | Premium | Enterprise | Ent PP | Ent Solver | DYNA
NUXY DesSpc | Pro | Premium | Enterprise | Ent PP | Ent Solver | DYNA
NUXZ DesSpc | Pro | Premium | Enterprise | Ent PP | Ent Solver | DYNA
NUYZ DesSpc | Pro | Premium | Enterprise | Ent PP | Ent Solver | DYNA
PERX – | – | – | Enterprise | Ent PP | Ent Solver | DYNA
PERY – | – | – | Enterprise | Ent PP | Ent Solver | DYNA
PERZ – | – | – | Enterprise | Ent PP | Ent Solver | DYNA
PRXY DesSpc | Pro | Premium | Enterprise | Ent PP | Ent Solver | DYNA
PRXZ DesSpc | Pro | Premium | Enterprise | Ent PP | Ent Solver | DYNA
PRYZ DesSpc | Pro | Premium | Enterprise | Ent PP | Ent Solver | DYNA
QRAT DesSpc | Pro | Premium | Enterprise | Ent PP | Ent Solver | DYNA
REFT DesSpc | Pro | Premium | Enterprise | Ent PP | Ent Solver | DYNA
RH– | Pro | Premium | Enterprise | Ent PP | Ent Solver | DYNA
RSVX DesSpc | Pro | Premium | Enterprise | Ent PP | Ent Solver | DYNA
RSVY DesSpc | Pro | Premium | Enterprise | Ent PP | Ent Solver | DYNA
RSVZ DesSpc | Pro | Premium | Enterprise | Ent PP | Ent Solver | DYNA
SBKX– | Pro | Premium | Enterprise | Ent PP | Ent Solver | –
SBKY – | Pro | Premium | Enterprise | Ent PP | Ent Solver | –
SBKZ– | Pro | Premium | Enterprise | Ent PP | Ent Solver | –
SONC– | Pro | Premium | Enterprise | Ent PP | Ent Solver | DYNA
THSX– | Pro | Premium | Enterprise | Ent PP | Ent Solver | DYNA
THSY– | Pro | Premium | Enterprise | Ent PP | Ent Solver | DYNA
THSZ– | Pro | Premium | Enterprise | Ent PP | Ent Solver | DYNA
VISC– | Pro | Premium | Enterprise | Ent PP | Ent Solver | DYNA

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 18.2 - © ANSYS, Inc. All rights reserved.