Release 11.0 Documentation for ANSYS
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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 <> PP <>
Valid material property label. Applicable labels are listed under "Material Properties" in the input table for each element type in the Elements Reference. See Linear Material Properties of the Elements 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). |
DAMP | — | K 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. |
VISC | — | Viscosity. |
SONC | — | Sonic velocity. |
RSVX | — | Electrical resistivities (also RSVY, RSVZ). |
PERX | — | |
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). |
Material reference number to be associated with the elements (defaults to the current MAT setting [MAT]).
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.
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.
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 of the Elements 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 (i.e., 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 on the MPTEMP and MPTGEN commands is minimally sufficient for a reasonable representation of the curve, an error message is output if the number is less than N and a warning message is output if the number is less than 2N. N is 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 = DAMP. 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 (i.e., using initial values [IC]). For more information on using table type array parameters, see the discussion on applying tabular boundary conditions in the Basic Analysis Guide.
This command is also valid in SOLUTION.
The following ANSYS product restrictions apply to the MP command:
In ANSYS Emag, only these properties are valid: RSV_, PER_, MUR_, MG__, and LSST.
In ANSYS Professional, all structural and thermal properties are valid except for DAMP and MU.
The SBK_ property is valid inANSYS Multiphysics, ANSYS PrepPost, and ANSYS ED only.