• Sharma, Vipin Kumar
• Bhardwaj, Harsh Kumar
• Bansal, Ashish
• Kumar, Ashwani

Abstract

Earlier, many experiments have been performed by researchers on specimens under quasi-static and dynamic conditions to determine the material property, stress-strain behavior and strain rate-time, etc. But there is no standard method that exists to calculate material property in dynamic conditions. In most experiments, the strain gauges were pasted on the specimen and the strains and corresponding stress were obtained. Our objective is to determine strain rate vs time curve for static as well as dynamic loading of the specimen. Dynamic tests are performed on the Split Hopkinson pressure bar to evaluate micro-strain vs time curve by the method of strain gauges. Strain gauges were mounted on the Hopkinson bar and signals of the strain gauges were acquired by a high-speed data acquisition system. The dynamic experiments were conducted by launching the projectile from the pressured chamber through a poppet valve along a long barrel. Compressed air inside the chamber is filled with the help of a storage tank through a control panel. A pulse shaper was placed between the projectile and the Hopkinson bar to give a smoother incident pulse.Keywords: Split Hopkinson pressure bar, Dynamic compression, Impact load.

Topics

• impedance spectroscopy
• experiment
• stress-strain behavior