Dynamic Deformation Behavior of Soft Materials at the Low Temperature Using SHPB Technique and Pulse Shaper

Abstract

This paper presents a modified Split Hopkinson Pressure Bar(SHPB) technique to obtain compressive stress-strain data for a rubber material. An experimental technique with a modified the conventional SHPB has been developed for measuring the compressive stress strain responses of materials with low mechanical impedance and low compressive strengths such as a rubber. This paper uses an aluminum pressure bar to achieve a closer impedance match between the pressure bar and the specimen materials. In addition, a pulse shaper is utilized to lengthen the rising time of the incident pulse to ensure stress equilibrium and homogeneous deformation of a rubber. It is found that the modified technique can determine the dynamic deformation behavior of rubbers under various conditions such as high strain rate and low temperature effects.