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The parts will be assembled at 1000 degrees C and then cooled, it is the cooling where the two different CTE come in. The problem is that the ceramic in the middle does not have published strength data, and therefore I need to understand the forces acting on it and then generate tests on the...

Fair question and at the moment I really do not know, other than I need to prove that the hole is sufficient for the requirements. Is there any formula for making a calculation on this? Thanks

The material at the center will be dimensionally stable, but as yet unknown, therefore is there any way of knowing the forces acting on it? Thanks

It is a small unit, with components inside, the volume is the air space inside the box. The pressure decay in required for a unit going from ground to altitude (exact level unknown), the only info supplied is the 70mbar/sec and the 0.8 bar in 27 secs. Thanks

Through the temperature range the internal part remains stable (whatever the material selected is going to be), however the external part although it can become smaller than dia.13mm, is will apply a force onto the internal part. Is there anyway of assessing what this force may be without...

Sorry missed the wall thickness, the hole will go through a side wall on the unit of 8mm in length.

A unit is being designed out of aluminium, and will have a lid to cover the main enclosure, but not sealed. The box needs to have a vent hole in it to ensure there is no pressure build up inside the unit. The vent hole has to meet the following requirements:- Maximum pressure decay rate of 70...

I have a thin ceramic tape formed into a disc (washer shape)- 0.2mm thick, external diameter 30mm, internal diameter 13mm. This works through a temperature range of 0 - 1000 degrees C. The change to the internal diameter through this temperature change is around 1.5mm. The material has a Youngs...