Thickness Effect of Pulse Shaper on Dynamic Stress Equilibrium in the NBR Rubber Specimen

Abstract:

This paper presents an experimental finding in the Split Hopkinson Pressure Bar (SHPB) technique to obtain a better compressive stress strain data for rubber materials. An experimental technique which modifies 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 rubber. This paper uses an all-polymeric pressure bar to achieves 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 rubber materials. It is found that the modified technique can determine the dynamic deformation behavior of a rubber more accurately.

• Periodical: Key Engineering Materials (Volumes 306-308)
• Pages: 1007-1012
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.306-308.1007
• Online since: March 2006
• Authors: Ouk Sub Lee, Sung Hyun Kim, Jong Won Lee
• Keywords: Dynamic Deformation, Dynamic Stress Equilibrium, High Strain Rate, Pulse Shaper, Rising Time, Rubber, Split Hopkinson Pressure Bar (SHPB)

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