Stress-Strain State of Disperse-Hardened Aluminum Joint Tube Under Internal Pressure

The paper presents research into the stress-strain state of an interference-fit connected tube made of dispersehardened aluminum alloy and subjected to the uniform internal pressure. The contact pressure and interference are determined to enhance the elastic resistance limit of the joint tube compared to a one-piece tube. It is shown that with increasing temperature and distance between strengthening particles at the same volume fraction, the maximum allowable interference decreases. In the case of small thickness, the elastic resistance limit of the inner tube increases linearly with the interference growth. The increase in the contact pressure at a comparable thickness of the outer and the inner tubes causes the higher stresses in the outer tube wall and contributes to its plastic deformation.