Undesirable stresses due to attaching (with adhesive) 2 different CTE parts 3

[elinah34]

hey,

I have ULTEM 1000 (CTE=55e-6 1/c) part that is attached (using adhesive) to a steel part (CTE=10e-6 1/c).
The ULTEM 1000 part is the orange ring in the photos below:

By the way, the parts' materials and the joining method by adhesion are constraints.
We are very worrid about stresses that will develop in the interface (adhesive) when exposing these parts to temperature change.
Someone claimed that splitting the ULTEM 1000 ring to some segments may help to reduce the thermal stresses, but I am not sure about it.

What can you say about it? an explanation would be great.

 

[moon161]

^ Are you considering essentially a force fit at one temperature extreme? Cause I think that's a great idea. Bore wall will contain the part and you won't hardly have a shear on the adhesive.

 

[SnTMan]

elinah34, you might try wishing. It works occasionally.

Regards.

Mike

The problem with sloppy work is that the supply FAR EXCEEDS the demand

 

[3DDave]

The range given is small - what happens during storage? It's a sad thing to pull a part from a cold transport truck, the belly of an aircraft, or a trailer left baking in the sun to find that the item no longer functions.

 

[elinah34]

3DDave - this range covers the product's entire life cycle temperature exposure.
Some offered using a counterbore or even a square shoulder. A cross section sketch might be blessed for making sure I understood you well.

Thanks again all of you!

 

[3DDave]

Not many products have the luxury of staying in a climate controlled facility. Lucky you.

 

[moon161]

 

[elinah34]

moon161 thank you for your effort