Looking for reference materials on the strength calculation of double-layer cylinders
Thread Content
It is a large cylinder, with a smaller cylinder attached to it axially; there is a water pressure of 7.0 MPa between the two cylinders. Now I need to determine the wall thickness and material for these cylinders. I was wondering if anyone here has any reference materials on this topic? Thank you so much
Is the large cylinder under internal pressure while the small cylinder is under external pressure? It’s a bit confusing with regard to the cylinders you mentioned – are they quite thick? Are there any without end caps? How to support it? How to connect? Boundary conditions have a significant impact on the calculation results and the methods used for calculation; it’s difficult to proceed with descriptions like this!
Uh, sorry I’m a newbie. It is a situation where the large cylinder is under internal pressure while the small cylinder is under external pressure. The inner diameter of the large cylinder is 28 mm, the outer diameter of the small cylinder is 25 mm, and O-rings are used for sealing. I just want to understand the stress conditions on it, and then calculate the required thickness – for example, how thick would it need to be if ordinary copper is used. I don’t know where to find the relevant information
In this case, is it sufficient to calculate separately the internal pressure acting on the large cylinder and the external pressure acting on the small cylinder?
This is likely a die-cast part (made of copper or aluminum alloy), with a cavity being formed directly within it; one end of this cavity is sealed using an O-ring. It’s just two components, sealed with an O-ring, and then fixed together with screws. I’m not sure if I expressed myself clearly. This thing is hanging. Moreover, 8 nozzles will be designed at that time, along with one water inlet and one water outlet, with an internal water pressure of 7.0 Mpa.
Your product is rather special; it can only be said that the calculation can be done based on the wall thickness according to GB150. As for the calculations related to sealing and connection structures, that’s more difficult to determine.
Calculate the internal pressure of the outer cylinder and the external pressure of the inner cylinder in accordance with GB/T150. With SW6, results are obtained quickly; if the inner tube is made of S30408 with a wall thickness of 2.5 mm, it can withstand an external pressure of 8 MPa at temperatures below 100 degrees.