Thermal Stress analysis give result far away from hand calculation result

Anonymous — Fri, 21 Jul 2017 13:52:38 GMT

HI,

I am trying to make a simple Thermal Stress simulation for a Assembly shown below in Fusion 360.

For the Top Block (in Molybdenum), the Force Load is 500kN downward and the thermal load is 700C. Frictionless Constrained on 2 surface

The middle part has a curve contact surface which matches the groove curvature on both the Top and Bottom part. It is made in Avesta253. Frictionless Constrained on 2 surface

For the bottom part in Copper, Frictionless Constrained on 3 surface

Top and the middle part material is set to be temperature dependent. I also did a simple stress analysis without thermal load and the result looks promising (as shown on bottom left).

My questions are the following:

1. Why whenever I set the part material to be temperature depoendent, in the result view, the safety factor of the part is always red and not showing the real safety factor?

2. II understand that the themal expansion will cause the middle part contact surface slide a bit on the top part contact surface. Should I define the contact as Sliding or speperation ? any more specific suggestion on how to define the contact is welcome

BR,

Keith

Re: Thermal Stress analysis give result far away from hand calculation result

Anonymous — Thu, 03 Aug 2017 15:15:36 GMT

Hi,

can you maybe include your hand calculation and your Design?

topic Thermal Stress analysis give result far away from hand calculation result in Fusion Design, Validate & Document Forum

Thermal Stress analysis give result far away from hand calculation result

Re: Thermal Stress analysis give result far away from hand calculation result