Optimal Design, Development and Experimental Analysis of a Tension–Torsion Hopkinson Bar for the Understanding of Complex Impact Loading Scenarios

Abstract Background Advanced testing methodologies and measurement techniques to identify complex deformation failure at high strain rates have drawn increasing attention in recent years. Objective The objective of the current study is development a novel combined tension–torsion split Hopkinson bar (TTHB) conceived generate combination tensile torsional stress waves single loading case, measure material data representative real case impact scenarios. Methods An energy store release mechanism was employed both longitudinal shear via rapid bespoke clamp assembly. A parametric geometry implemented numerical simulations optimise critical aspects wave generation. Thin-walled tube specimens made two metallic materials were utilised examine capability developed TTHB system by comparing experimental measurements with those obtained from conventional tension torsion bars. Results results demonstrate that synchronisation achieved within 15 microseconds. Different rise time controlled using fracture pins various materials. analysis indicates capable characterising dynamic behaviour under tension, torsion, as well wide range states. Conclusions presented apparatus, methods allow for direct population envelopes engineering accurate evaluation existing constitutive models.