You can choose constant, isotropic, linear material properties from a material library available through
the GUI.Young's modulus, density, coefficient of thermal expansion, Poisson's ratio, thermal conductivity
and specific heat are available for 10 materials in four unit systems.
CautionThe property values in the material library are provided for your convenience. They are typ-
ical values for the materials you can use for preliminary analyses and noncritical applications.
As always,you are responsible for all data input to the program.To define temperature-dependent material properties, you can use the MP command in combination
with the MPTEMP or MPTGEN command. You also can use the MPTEMP and MPDATA commands.
The MP command allows you to define a property-versus-temperature function in the form of a poly-
nomial. The polynomial may be linear, quadratic, cubic, or quartic:
Property = C 0 + C 1 T + C 2 T^2 + C 3 T^3 + C 4 T^4Cn are the coefficients and T is the temperature. You enter the coefficients using the C0,C1,C2,C3, and
C4 arguments on the MP command. If you specify just C0, the material property is constant; if you
specify C0 and C1, the material property varies linearly with temperature; and so on.When you specify
a temperature-dependent property in this manner, the program internally evaluates the polynomial at
discrete temperature points with linear interpolation between points (that is, piecewise linear represent-
ation) and a constant-valued extrapolation beyond the extreme points. You must use the MPTEMP or
MPTGEN command before the MP command for second and higher-order properties to define appro-
priate temperature steps.
The second way to define temperature-dependent material properties is to use a combination of
MPTEMP and MPDATA commands.MPTEMP (or MPTGEN) defines a series of temperatures, and MP-
DATA defines corresponding material property values. For example, the following commands define a
temperature-dependent enthalpy for material 4:
MPTEMP,1,1600,1800,2000,2325,2326,2335! 6 temperatures (temps 1-6)
MPTEMP,7,2345,2355,2365,2374,2375,3000! 6 more temps (temps 7-12)
MPDATA,ENTH,4,1,53.81,61.23,68.83,81.51,81.55,82.31! Corresponding
MPDATA,ENTH,4,7,84.48,89.53,99.05,112.12,113.00,137.40! enthalpy valuesIf an unequal number of property data points and temperature data points are defined, the program
uses only those locations having both points defined for the property function table. T o define a different
set of temperatures for the next material property, you should first erase the current temperature table
by issuing MPTEMP (without any arguments) and then define new temperatures (using additional
MPTEMP or MPTGEN commands).
The MPPLOT command displays a graph of material property versus temperature.Figure 1.1: Sample
MPPLOT Display (p. 6) shows a plot of the enthalpy-temperature curve defined in the example above.
The MPLIST command lists material properties.
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