mp¶
- Mapdl.mp(lab='', mat='', c0='', c1='', c2='', c3='', c4='', **kwargs)¶
APDL Command: MP
Defines a linear material property as a constant or a function of temperature.
- Parameters
- 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:
- 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 full harmonic analysis or damping ratio in mode-superposition analysis.
- 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
, orSOLID98
, the program interprets the values as absolute permittivity. Values input forPLANE223
,SOLID226
, orSOLID227
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
PLANE223
,SOLID226
, andSOLID227
.- REFT
Reference temperature. Must be defined as a constant;
C1
throughC4
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%
); ifC0
is a table name,C1
throughC4
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\[Property = C_0 + C_1(T) + C_2(T)^2 + C_3(T)^3 + C_4(T)^4\]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
orMPTGEN
commands must be used for second and higher order properties to define appropriate temperature steps. To ensure that the number of temperatures defined via theMPTEMP
andMPTGEN
commands is minimally sufficient for a reasonable representation of the curve, ANSYS generates an error message if the number is less thanN
, and a warning message if the number is less than2N
. The valueN
represents the highest coefficient used; for example, ifC3
is nonzero andC4
is zero, a cubic curve is being used which is defined using 4 coefficients so thatN
= 4.