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The extraction of mechanical properties of tubes in the hoop direction was accomplished with the ring hoop tension test. In this test, a ring extracted from the tubes is placed over two D-shaped mandrels that are then parted with the aid of a testing machine. A detailed numerical investigation was performed to establish the validity of this test. In particular, the effect of the friction and of the radial through-thickness stresses that are induced due to the contact between the ring and the die was examined in detail. It was discovered that in a well-controlled test, these effects are comparable or lower to testing of a tube by hydraulic inflation which is a reliable method for obtaining the hoop properties of tubes. After the numerical investigation, a series of ring hoop tension tests were performed on Al-6061-T4 tubes. Three-dimensional Digital image correlation (DIC) was used to capture the strain evolution in the gage section of the specimens. By comparing the hoop with the axial response, the material anisotropy of the Al-6061-T4 tubes was established. As a further step, a series of notched ring hoop tension test specimens were designed and tested. By controlling the orientation of the notch, multiple points on the yield surface of the material are obtained

Assessment of Anisotropy of Extruded Tubes by Ring Hoop Tension Test