Learning Forum

[Henry Powell]

Hey all, new to ANSYS and trying to run a static structural for a power module. I keep getting a warning about the thermal expansion coefficients, as seen below. I have my enviromental reference set to 25C currently, altought I have also tested with 20C. In addition, I keep getting the same warning and error messages when I try to run, also seen below. Are these two problems related and if so, how to go about fixing them?

*** WARNING ***                         CP =     244.427   TIME= 01:40:28
 Material property ALPX of material 7 of element 1751129 is evaluated at 
 a temperature of 20, which is below the supplied temperature range.     
 Temperature range checking terminates.                                  

 *** ERROR ***                           CP =     244.427   TIME= 01:40:28
 Thermal strain in element 1751129 with material 7 has caused the        
 element to invert.  Please check the thermal expansion definition and   
 the temperature change.         

[Ashish Khemka]

Hi Henry,

The warning message is about property being evaluated at the temperature out of range. Double check the material definitions, especially for material '7'. It is easy to accidentally miss the - in the exponent of a thermal expansion coefficient i.e. entering something like 1.7E6 instead of 1.7E-6.

Regards,

Ashish Khemka