Dynamic responses of copper and impact velocity of split Hopkinson pressure bar strikers

Abstract

Copper high-impact analysis is critical for understanding characterization at dynamic strain rates. The dynamic behaviour of any material is influenced by numerous components of a split Hopkinson pressure bar (SHPB), such as striker forms, striker speed, striker length, bar geometry, and so on. There is also a significant information gap in the literature when it comes to determining the behaviour of copper under high strain rates, especially when the SHPB parameters are varied. Using ABAQUS/Explicit 6.14, this paper numerically investigates the dynamic behaviour of copper under different striker bar shapes (circular flat, circular round, and square) and impact velocities (10, 12.5, 15, 17.5, and 20 m/s). To understand the effects of the specimen's shape under high strain rate loadings, the geometry of the copper specimen is also changed from circular to square. Copper's behaviour was found to be positively sensitive to strain rates, and compressive strength increased by 32%. For the common velocity of the striker, the maximum copper strength was found for a circular flat-shaped striker and the minimum for a circular round-shaped striker. The true yield strength and ultimate strength increase by 8% and 3%, respectively, when the shape of the specimen changes from circular to square.