Design and Application of a Gripping Apparatus for Torsion Testing of Aluminum/Composite Tubes

As is known, hybrid composite shafts with fibers and metals offer remarkable improvements in terms of mechanical performance, and research is still ongoing in this field. Due to the nature of torsional loading, it is seen that various holding apparatuses are applied for specimens of different diameters to test the specimen without slipping between the test jaws, especially for large parts. This study examines specimen types and connection elements used in torque tests, and a practical solution that can be used in universal testing machines is investigated. In this context, experiments were carried out for unreinforced aluminum tubes and [±452/Al] arrayed specimens using screw clamp connection and shape-bonded designs. It was found that reinforcement of the clamping region of the specimens with an additional layer in hybrid tubes is a preferable solution for shape-bonded connections