Experimental and Static Structural Analysis of AHSS Material with Varying Slenderness Ratios Using Split Hopkinson Pressure Bar

Abstract

Material behavior at high strain rates is frequently characterized using the Split Hopkinson Pressure Bar Tests. It is a key testing tool for materials' dynamic mechanical characteristics. In the SHPB test, the material properties obtained are influenced by the specimen's shape. It is important to select the specimen dimensions understanding the behaviour. This study examines how strain and stress values are affected by varying the specimen diameter. The outcomes of the experiments were compared and verified using Ansys. In this study 5mm, 6mm, 7mm, 8mm and 10mm cylindrical specimens of Advanced High Strength Steels (AHSS) were tested under 0.5Mpa, 1Mpa and 1.5 Mpa along with different slenderness ratios. The length (L) of the specimens and the bar requirements were unaltered. The results showed that when the specimen's area decreased, the reflected ratio increased while the transmitted ratio decreased. By altering the specimen diameter, it was demonstrated that the impedance relationship and strain rate could be changed without altering the bar's actual size or composition. The input stress-strain curve and the actual computed stress-strain states in the specimen are compared with the stress-strain behaviour of the specimen, which is reconstructed using the pressure bars' calculated response.