The linear material properties used by the element type are listed under Material Properties in the input table for each element type.
Tabular input is also available for some material properties.
Table 3.1: Linear Material Properties (Defined via
MP,Lab)
Material Property
(Lab Value) | Units | Description |
|---|---|---|
| EX | Force/Area | Elastic modulus, element x direction |
| EY | Elastic modulus, element y direction | |
| EZ | Elastic modulus, element z direction | |
| PRXY | None | Major Poisson's ratio, x-y plane |
| PRYZ | Major Poisson's ratio, y-z plane | |
| PRXZ | Major Poisson's ratio, x-z plane | |
| NUXY | Minor Poisson's ratio, x-y plane | |
| NUYZ | Minor Poisson's ratio, y-z plane | |
| NUXZ | Minor Poisson's ratio, x-z plane | |
| GXY | Force/Area | Shear modulus, x-y plane |
| GYZ | Shear modulus, y-z plane | |
| GXZ | Shear modulus, x-z plane | |
| ALPX | Strain/Temp | Secant coefficient of thermal expansion, element x direction |
| ALPY | Secant coefficient of thermal expansion, element y direction | |
| ALPZ | Secant coefficient of thermal expansion, element z direction | |
| CTEX | Strain/Temp | Instantaneous coefficient of thermal expansion, element x direction |
| CTEY | Instantaneous coefficient of thermal expansion, element y direction | |
| CTEZ | Instantaneous coefficient of thermal expansion, element z direction | |
| THSX | Strain | Thermal strain, element x direction |
| THSY | Thermal strain, element y direction | |
| THSZ | Thermal strain, element z direction | |
| REFT | Temp | Reference temperature (as a property) (see also TREF) |
| MU | None | Coefficient of friction (or, for FLUID29, boundary admittance) |
| ALPD | None | Mass matrix multiplier for damping (also see ALPHAD) |
| BETD | None | Stiffness matrix multiplier for damping (also see BETAD) |
| DMPR | None | Damping ratio |
| DMPS | None | Constant structural damping coefficient |
| DENS | Mass/Vol | Mass density |
| KXX | Heat*Length/ (Time*Area*Temp) | Thermal conductivity, element x direction |
| KYY | Thermal conductivity, element y direction | |
| KZZ | Thermal conductivity, element z direction | |
| C | Heat/Mass*Temp | Specific heat |
| ENTH | Heat/Vol | Enthalpy (
DENS*C d(Temp)) |
| HF | Heat / (Time*Area*Temp) | Convection (or film) coefficient |
| EMIS | None | Emissivity |
| QRATE | Heat/Time | Heat generation rate for thermal mass element MASS71 |
| None | Fraction of plastic work converted to heat (Taylor-Quinney coefficient) for coupled-field elements PLANE222, PLANE223, SOLID225, SOLID226, and SOLID227 | |
| VISC | Force*Time/ Length2 | Viscosity |
| SONC | Length/Time | Sonic velocity (FLUID29, FLUID30, FLUID129, and FLUID130 elements only) |
| MURX | None | Magnetic relative permeability, element x direction |
| MURY | Magnetic relative permeability, element y direction | |
| MURZ | Magnetic relative permeability, element z direction | |
| MGXX | Current/Length | Magnetic coercive force, element x direction |
| MGYY | Magnetic coercive force, element y direction | |
| MGZZ | Magnetic coercive force, element z direction | |
| RSVX | Resistance*Area/Length | Electrical resistivity, element x direction |
| RSVY | Electrical resistivity, element y direction | |
| RSVZ | Electrical resistivity, element z direction | |
| PERX | None | Electric relative permittivity, element x direction |
| PERY | Electric relative permittivity, element y direction | |
| PERZ | Electric relative permittivity, element z direction | |
| LSST | None | Dielectric loss tangent |
| SBKX | Voltage/Temp | Seebeck coefficient, element x direction |
| SBKY | Seebeck coefficient, element y direction | |
| SBKZ | Seebeck coefficient, element z direction | |
| DXX | Length2/Time | Diffusion coefficient, element x direction |
| DYY | Diffusion coefficient, element y direction | |
| DZZ | Diffusion coefficient, element z direction | |
| CSAT | Mass/Length3 | Saturated concentration |
| CREF | Mass/Length3 | Reference concentration |
| BETX | Length3/Mass | Coefficient of diffusion expansion, element x direction |
| BETY | Coefficient of diffusion expansion, element y direction | |
| BETZ | Coefficient of diffusion expansion, element z direction |
Some element types support material properties defined as a function of primary variables, accomplished by using tabular input when defining the property.
Tabular input for linear material properties is typically defined via the MP family of commands, although the TB family of commands can be used for some linear material properties.
To input a table, dimension the table array parameter (*DIM) and identify the variables. Enclose the table name within % characters:
MP,Lab,,%tabname%
|
The possible primary variables for material tabular input are:
Time (TIME) or frequency (FREQ)
X location (X) in local or global coordinates
Y location (Y) in local or global coordinates
Z location (Z) in local or global coordinates
Temperature (TEMP) load or degree of freedom
Concentration (CONC) degree of freedom
Pressure (PRESSURE) degree of freedom
Computed fluid velocity (VELOCITY)
Example 3.1: Using Tabular Input (via MP) with One Primary Variable to Define Resistivity
A temperature-dependent resistivity is specified using a table array (as an alternative to using MPTEMP and MPDATA).
*DIM,RSV_T,TABLE,5,,,TEMP ! Define RSV_T with TEMP
! primary variable
RSV_T(1,0)=0.,50.,100.,150.,200. ! Assign temperature values
RSV_T(1,1)=1.e-8,1.4e-8,1.6e-8,1.8e-8,2.e-8 ! Assign resistivity values
MP,RSVX,1,%RSV_T% ! Input RSV_T on the MP command
Example 3.2: Using Tabular Input (via MP) with Two Primary Variables to Define the Diffusivity Coefficient
The diffusivity coefficient is dependent on both concentration (CONC) and time (TIME).
*DIM,DXX_CT,TABLE,3,4,,CONC,TIME ! Define DXX_CT with
! CONC and TEMP primary variables
*TAXIS,DXX_CT,1, 0,1,2 ! X-axis is CONC, normalized
*TAXIS,DXX_CT,2, 1,2,3,4 ! Y-axis is TIME, hours
DXX_CT(1,1)= 2.e-6,3.e-6,4.e-6 ! Assign DXX vs CONC at TIME = 1 hr
DXX_CT(1,2)= 1.6e-6,2.4e-6,3.8e-6 ! Assign DXX vs CONC at TIME = 2 hr
DXX_CT(1,3)= 1.4e-6,2.2e-6,3.5e-6 ! Assign DXX vs CONC at TIME = 3 hr
DXX_CT(1,4)= 1.1e-6,2.e-6,3.1e-6 ! Assign DXX vs CONC at TIME = 4 hr
MP,DXX,1,%DXX_CT% ! Input DXX_CT on the MP command
To input a table via the TBDATA command, dimension the table array parameter (*DIM) and identify the variables. Enclose the table name within % signs.
TBDATA,STLOC,%tabname% |
where STLOC is the starting location in the table for
entering data. (Default = last location filled + 1.)
Example 3.3: Using Tabular Input (via TBDATA) with the TEMP Primary Variable
The temperature-dependent elastic coefficient c66 is defined for anisotropic elasticity (TB,ANEL).
*DIM,c66_T,TABLE,5,,,TEMP c66_T(1,0)= 20,40,60,80,100 ! Temperature c66_T(1,1)= 39.8e9,40.0e9,40.1e9,40.3e9,40.4e9 ! Stiffness coefficient TB,ANEL,1,,,0 ! Anisotropic elasticity material data table ... TBDATA,21,%c66_T% ! Tabular input for elastic constant 21
Table 3.2: Supported Elements, Material Properties, Primary Variables
| Material Property | Primary Variables |
|---|---|
| Coupled-Field Solids: PLANE222, PLANE223, SOLID225, SOLID226, SOLID227 | |
| Diffusivity coefficients (DXX, DYY, DZZ) | TIME, X, Y, Z, TEMP, CONC |
| Saturated concentration (CSAT) | TIME, X, Y, Z |
| Electrical resistivities (RSVX, RSVY, RSVZ) | TIME, X, Y, Z, TEMP, CONC |
| Coefficients of diffusion expansion (BETX, BETY, BETZ) | TIME, X, Y, Z, TEMP, CONC |
| Reference concentration (CREF) | TIME, X, Y, Z, TEMP, CONC |
| Anisotropic Elasticity (ANEL) | TEMP, FREQ[a] |
| Piezoelectricity (PIEZ) | TEMP, FREQ[a] |
| Anisotropic Electric Permittivity (DPER) | TEMP, FREQ[a] |
| Diffusion Solids: PLANE238, SOLID239, SOLID240 | |
| Diffusivity coefficients (DXX, DYY, DZZ) | TIME, X, Y, Z, TEMP, CONC |
| Saturated concentration (CSAT) | TIME, X, Y, Z |
| Coupled Thermal-Fluid Pipe: FLUID116 | |
| Thermal conductivity (KXX) | TIME, X, Y, Z, TEMP, PRESSURE, VELOCITY |
| Specific heat (C) | TIME, X, Y, Z, TEMP, PRESSURE, VELOCITY |
| Mass Density (DENS) | TIME, X, Y, Z, TEMP, PRESSURE, VELOCITY |
| Coefficient of friction (MU) | TIME, X, Y, Z, TEMP, PRESSURE, VELOCITY |
| Viscosity (VISC) | TIME, X, Y, Z, TEMP, PRESSURE, VELOCITY |
| Film coefficient (HF) | TIME, X, Y, Z, TEMP, PRESSURE, VELOCITY |
| Hydrodynamic Bearing: FLUID218 | |
| Viscosity (VISC) | X, Y, Z, TEMP, PRESSURE |
| Mass density (DENS) | X, Y, Z, TEMP, PRESSURE |
| Thermal Mass: MASS71 | |
| Heat-generation rate (QRATE) | TIME, X, Y, Z, TEMP |
For more information about using tabular input and additional examples, see:
Information about element-specific usage of tabular input for material properties is available in the description of the element that you are using.