The characterisation of materials underneath dynamic loadings has constantly stood essential for determining their precise behaviour under dynamic situations, such as explosions, shakings, bullet penetrations, crashworthiness of vehicles and bullet-resistant shields. Utilising experimental techniques such as Split Hopkinson Pressure Bar (SHPB) and Taylor Impact Tests, these dynamic characteristics are determined. These procedures are extremely expensive and hard to execute. The performance of resources underneath dynamic conditions can however be simulated numerically. Using ABAQUS/Explicit 6.14, numerical simulations of the aluminium alloy 7075 under varying striker bar shapes and striker velocity changes at high strain rates are performed. The effects of specimen aspect ratio are also investigated under dynamic conditions. To demonstrate the result of shape, geometry of the striker is altered. In addition, the impact velocity is varied between 60 and 100 m/s to observe the influence of speed underneath high-strain loadings. The wave properties and flow curve of AA 7075 are reliant on the striker factors and sample aspect ratio, according to the results.