High-Temperature Static Analysis

Simulation Generality
1

Hello everyone, I want to thank you for your help

I'm simplifying the question as much as possible in a basic case. I have a problem with a fairly simple static study, a steel bar (or beam) (AISI 1020) fixed at one of its ends and its upper face is subjected to a force (bending) of 2500 N for example. 
When I run the simulation without setting a temperature condition (ambient temperature by default) the distribution of constraints is logical. But when I add more than the previous conditions,  a temperature condiiton (I put a temperature on the whole bar) quite high (between 150 and 200 °C) the distribution of the stresses becomes illogical, I have too high Von Miises stresses that exceed 500 MPa. This result is physically incorrect, it is true that the properties of steels degrade with the increase in temperature, but such a raised stress: it does not seem coherent to me at all...

Thank you for your help

Ibrahim


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2

A quick search led me to this discussion: http://forums.futura-sciences.com/technologies/568140-limite-elastique-de-differents-materiaux.html that should provide you with elements to correlate your values (hypotheses and results).

The temperature behaviour of steels seems to be a fairly narrow field, although 200°C is not extreme.

3

I know that elastic limits decrease according to temperatures, there are standards that give values at different temperatures.

However, my problem is not in the elastic limit but in the distribution of the stresses itself between a temperature of 20 ° and 200 °C the stresses in the beam increase 10 times more. This is not normal

4

Apparently Young's module is also evolving

5

Indeed,  Young's modulus decreases with temperature, between 20 °C and 200 °C it varies from 210 to 180 GPa for conventional steels. But this does not justify the significant constraints, even when I introduced the good mechanical properties at 200°C, it unfortunately did not change much ...

6

Hi everyone

I managed to solve my problem, to do a static study at high temperature on SolidWorks, it is not wise to put the temperature as a boundary condition in the static study, you must first run a thermal study, then go back to the static study and import the thermal results by adding the other conditions on the movements and loads.
Ps: to import the results of the thermal study you have to go to

 

External Loading Advisor => Thermal Effects then check on Temperature from a thermal study

 

Run the calculation 

 

A++

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