Stress-strain State of Dispersion-hardened Aluminum Tube Under External and Internal Pressure

The paper presents research into the stress-strain state of a heavy-walled aluminum alloy tube strengthened by incoherent nanoparticles, subjected to the external and internal pressure. Mathematical simulation shows that one and the same localization of the plastic region corresponds to two different cases of the strass-strain state of the tube walls. When the internal pressure is lower than the external, the stress-strain state is characterized by the wall compression in a tangential direction. In the opposite case, tangent tensile stresses appear in the tube wall.