Why are there requirements for the bonding strength of composite sheets used in pressure vessels?
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I’ve always heard that composite panels cannot be used to manufacture pressure vessels due to insufficient bonding strength, but I don’t understand what role the bonding strength of these panels plays in pressure vessels, nor what consequences arise when this bonding strength is much lower than the required standard. I hope the seniors here can help me figure this out
As the main material for pressure vessels, the bonding strength of composite sheets is a very important parameter. Components such as end caps and cylinders need to be formed through stamping or rolling; if the composite sheets do not have sufficient bonding strength, delamination and cracking can occur during the manufacturing process.
Also, it is inevitable to weld the internal components of containers; for tower-type containers, even more welding is required for their internal parts. Welding these components inevitably creates certain tensile stresses, and without sufficient bonding strength, the laminates can be torn apart.
It seems I was overthinking it; my current company also manufactures equipment, specifically atmospheric pressure reactors, which use hot-rolled composite sheets. The adhesion strength of these sheets is only in the range of a few dozen megapascals, but it is still sufficient to meet the requirements for processing the reactor vessels. But I heard from senior employees that pressure vessels require explosive clad plates, and I thought there was a direct relationship between the operating pressure of the vessel and the bonding strength of the clad plate. Thank you for your answer
The shear strength of rolled composite steel plates is also very high at present; the shear strength of stainless steel composites according to the YB/T 4282-2012 standard exceeds 210 MPa as well. I don’t know what standards you use.
What we do is zirconium steel compositing; rolling cannot achieve such high shear strength. We use composites to replace linings, as the requirements for shear strength are not very high
Composite plate containers made from this material have not been developed yet – it’s a high-tech product!
Explosive bonding is recommended for pressure vessels