Autodesk Inventor Nastran Validation 11 - Thermal Stress of a Thick Walled Cylinder

This video is a thermal stress results validation model of a thick walled cylinder. The outer radius is 2", inner radius is 1", height is 4" with a temp. difference of 10°F (cooler inside). We compare the hoop stress on the inside and outside of the cylinder from our Autodesk Inventor Nastran simulation with theory. We start with a linear steady state heat transfer analysis and use the temperature output of that for the load in the linear static analysis.

[@CJR789]

i''m absolutely beginner thanks you very much for posting this video, this really help me to learn...

[@mikefiedler2039]

You're very welcome!

[@pablobegazzo7596]

gracias por la buena explicacion

[@juratomorad8641]

Thank you for a very informative video. You applied a temperature load on the inside surface, and on the outside surface. What temperatures does NASTRAN apply automatically to the surfaces on which no temperatures are applied? Is it T_REF? Or is it simply 0°C?

[@mikefiedler2039]

Hello Jura! Because it is a steady state linear thermal analysis, the program is finding the thermal distribution after some 'infinite' amount of time, so the initial temperatures of the 'other' nodes does not matter because the lowest and highest temperatures in the model will be dictated by the loads that we did apply to the model and all other nodes will end up somewhere between those extremes. That said, two things to note (1.) if no load of any type is applied to a surface, the surface is treated as an adiabatic surface and (2.) the temperature of the other nodes would matter in a transient thermal analysis where we might want to see how fast something heats up or cools down. If it is a transient thermal analysis, then you would want to make sure that an initial temp is defined... this could be done with the 'initial condition' load with the 'sub type' of temperature - or first running a steady thermal to get the starting distribution for the transient analysis. I'll make sure to get to some transient thermal analysis as an example.

[@juratomorad8641]

@@mikefiedler2039 Thank you for a clear explanation!