Learning Forum

[FeRo220]

Hello,

I was using ANSYS (2021R) Steady-State Thermal and was wondering how the program determines Thermal Conductivity if the value is dependent on Temperature.

For example, for Aluminum Alloy, the plot is as followed:

[Vinayak Vipradas]

Linear extrapolation is used within the temperature range specified. However, if the temperature falls below or rises above the defined temperature range of tabular data, then ANSYS assumes the defined extreme minimum or maximum value respectively for the material property outside the defined range.
For further information on how thermal conductivity and other material properties are evaluated, please refer to the following link:
1.6. How Material Properties Are Evaluated (ansys.com)

Thanks Vinayak

[FeRo220]

Okay thank you, So for my example, ANSYS would just use 114 for any temperature less than or equal to -100 C.

[Vinayak Vipradas]

Yes, ANSYS would use the value of thermal conductivity as 114 W/mK for your example, for any temperature less than or equal to -100 degree Celsius.

Thanks,
Vinayak