Abstract
Dynamic material characterization is one of important factors in the development of modern transportation industry to overcome two main challenges, i.e. lightweight and crashworthy vehicles. The most commonly used apparatus to characterize the material in high strain rates is the Hopkinson bar. The Hopkinson bar can be conducted into several loading conditions such as compression, tension, shear, torsion and multiaxial. This paper focuses on the split Hopkinson shear bar testing, especially on the effect of the shear angles on generating the shear stress – shear strain curves, shear strain rates, and final shear strains. Four geometries of specimen were studied, i.e. circular hat-shaped (CHS), flat hat-shaped (FHS), punch (P) and double-notch (DN). This research is conducted with three main considerations, i.e. the same kinetic energy (7.34 Joule), the same shear area (±25 mm2), and the shear angles were varied as ±2.5°, 5°, 7.5°, 10° and 15°. This study shows that each testing has its own advantages and disadvantages and they generate different strain rate, strain rate gradient, final strain, and shear stress – shear strain relations which is not desirable. In term of shear angles, authors recommend using a shear angle of appoximately 5°. This shear angle generates the best purity on the shear loading among other shear angles and also the flow stress variation (among four tests) are quite acceptable ±16.4%.
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