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I understand that it would be easy to just conduct a physical experiment but I am trying to find some way to model this theoretically if it is at all possible. Thanks for the help though.

Thanks for that B.E. I am more looking for actual calculations/equations which might give a required expansion pressure to crush the pipe for different materials.

I am looking at how various materials react to conditions in a fire and how different materials soften and then are ultimately crushed by an intumescent fire collar in a penetration. Industry standards (Australian) require no fire and smoke to be able to move through the penetration and only a...

The pipes im looking at are various common water pipes. ie. PP, PVC, HDPE, PEX.

Okay thanks for the tips! I'm looking at hard char intumescents which do produce some expansion pressure. Do you have any idea how much strength would remain in the pipe as it gets up to high temperatures or does it just melt away? I'm really looking for a way to calculate what an applied force...

There will be nothing in the pipe, just looking at a section which will penetrate a ceiling with about 20 cm out at each end, not sealed.

I'm looking to calculate the force required to crush various polymer-type pipes through the use of intumescent materials in fire collars. The force contact patch would be around 20mm in length on the outside of the pipe, with the force crushing the pipe from all directions circumferentially on...