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piecewise polynomial material properties

piecewise polynomial material properties

Posted in the ANSYS Forum

hugo_CERN

Geneva, Switzerland

#1 Feb 10, 2012
I would like to describe the heat capacity of copper using a piecewise polynomial function.
I have 4 ranges of temperatures and then 4 different polynomial functions.
I use four times MPTGEN and MP commands to inform about the 4 ranges of temperature and the 5 coefficients of the polynoms for these 4 ranges.
The problem is that ansys re-compute the heat capacity for the previous range of temperature each time I use a new range of temperature...
How can I do to keep in memory the first polynom, the second, etc...?
cuivre = 3 !(OFHC)
ET,cuivre,PLANE55
!---------
Tinia= 0
Tfinia= 10
deltaT= 0.5
MPTGEN,,(Tfinia - Tinia)/deltaT , Tinia, deltaT
C4a=-3.4375E-06
C3a= 0.00080692
C2a=-0.000237723
C1a= 0.011383929
C0a=-0.000285714
MP, C, cuivre, C0a, C1a, C2a, C3a, C4a
!---------
Tinib= 10
Tfinib= 40
deltaT= 0.5
MPTGEN, 21,(Tfinib - Tinib)/deltaT , Tinib, deltaT
C4b=-3.40402E-05
C3b= 0.003337054
C2b=-0.050892857
C1b= 0.387276786
C0b=-0.920758929
MP, C, cuivre, C0b, C1b, C2b, C3b, C4b
MPPLOT,C,3

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