hello dear fellows, I would like to know about the possible capability of sim scale to model the shrink fit pressure cylinders. I would like to know that how much residual stress gets imparted in my cylinders in the steady state at the start of analysis. then further i will continue with the internal pressure. Its OK if i can apply both conditions simultaneously.

the example picture is from another FE software, i want to do it in simscale to increase the computational size of my geometry and add more complex loading.

Hi @hur_rehman

The thermomechanical solver will calculate heat transfer through a solid and the resulting stresses and displacements. It also enables you to do a transient study. You can define a new material with a negative coefficient of thermal expansion. If need be the coefficient can be defined as a function of temperature (as it might not be a fixed value) . As long as you know the value of this coefficient and a few other material properties such as its thermal conductivity and youngâ€™s modulus then you should be able to simulate it.

Hello roy,

actually my question is not about heat transfer and stresses due to thatâ€¦, rather I am asking how can I model the shrink fit phenomenonâ€¦ ? in this you press a relatively larger diameter cylinder into a big cylinder whose internal bore diameter is slightly less than the pressing cylinder. This induces stresses in both cylindersâ€¦

Well in this case the inner diameter of the outer cylinder is larger than the outer diameter of the inner cylinder but iâ€™m almost certain that it is not ok to leave an empty gap between the two cylinders so I think you will have to model it as if there is no gap and make the cylinders touch. You could also try defining a 3rd cylinder in the middle to take the place of the gap and give this new cylinder a very very low youngâ€™s modulus but to be honest iâ€™m not sure this will work as it will cause the middle cylinder to be compressed by a huge amount and if the gap is very thin it will also be problematic to mesh. The thermomechanical solver uses a static mesh so there is a limit to how much deformation can be accurately modeled. @jousefm can you find out for us how much strain is permissible?

actually roy,

sorry but you again misunderstood it have a look at it

https://www.google.com/imgres?imgurl=https%3A%2F%2Fwww.ctemag.com%2Fsites%2Fwww.ctemag.com%2Ffiles%2Farticle_images%2F09%252c%2520Machine%2520Technology_opt.jpeg&imgrefurl=https%3A%2F%2Fwww.ctemag.com%2Fnews%2Farticles%2Fshrink-fit-toolholder-fundamentals&docid=oIVz5FTYN1Ox6M&tbnid=-rJuMeawwzCwAM%3A&vet=10ahUKEwjSydGtkNPjAhULBWMBHT6NCsMQMwhcKBMwEw..i&w=528&h=519&bih=674&biw=1536&q=shrink%20fit&ved=0ahUKEwjSydGtkNPjAhULBWMBHT6NCsMQMwhcKBMwEw&iact=mrc&uact=8

its standard in other FE softwares just wondering if simscale supports such contact, because apparently it did not worked out with meâ€¦

Could you explain what it is for?

Cool project idea @hur_rehman!

You can make use of the geometries rotational symmetry and use the cyclic symmetry boundary condition, an example can be found here (unfortunately with an outdated geometry but re-uploading will do the job): **Tool Holder - Shrink Fit Analysis**

Best,

Jousef