Stress analysis and temperature input

[methoni]

Having recently modeled a pressure vessel part, the next phase was to determine the thickness was adequate for the pressure and temperature.

Adding the pressure to the part is straight forward, however when one comes to the input of the temperature this seems to be a problem ,the question being is there any facility in inventor for temp. input.

We know that as temperature rises the yield strength of the metal decreases.  I assume that inventor bases the temperature/yield strength of the steel at room level.

 At present using other available  software i can determine the reduction in yield strength ,this figure i can then use for a custom material

each time altering if need be the yield strength relative to the diffent temperatures.This does seem to be a long winded method,is there temperature input in analysis or not?

Regards

[admaiora]

Hi Methoni,

no there is not, for now.

[Vish777]

Hi,

In a case of a pressure vessel operating at a high temperature. So then stresses on the model would be due to internal pressure as well as stresses at BC due to thermal expansion with a decrease in yield strength taken into account.

In order to accomplish this I would then have to apply the pressure, find the equivalent material properties at the elevated temperature and use that as input in order to analyze the model?

As it is at higher temperature there would be expansion. Will inventor take this into account or will I have to determine the thermal expansion and then input it as a displacement BC.

Does this approach make sense and would it be a fair "Design by Analysis" method as the various codes require. Or is it safer to use dedicated FEM packages?

Thanks,

Vish