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Study on dynamic mechanical response of a polymer bonded explosive under high strain rates

XUANMING CAI1, WEI ZHANG1,* , DACHENG LI1, WENBO XIE1

Affiliation

  1. Hypervelocity Impact Research Center, Harbin Institute of Technology, Harbin 150080, China

Abstract

Dynamic compressive stress-strain curves of a polymer bonded explosive (PBX) at high strain rates (from 403s-1 to 2207 s-1) have been determined with a modified split Hopkinson pressure bar (SHPB). Pulse shaping was used to ensure that the PBX specimen deforms at a nearly constant strain rate under dynamically equilibrated stress. A nearly constant strain rate under dynamically equilibrated stress was provided based on the pulse shaping. The laser displacement meter was used to monitor the axial strain of the specimen in the experiments. The validity of the experiments was monitored by the polyvinylidene fluoride (PVDF) force sensors for dynamic stress equilibrium, and by a high-speed camera for specimen deformation. All results indicate that the material is sensitive to strain rate and the strain-rate sensitivity depends on the value of strain, and the compressive strength improves with the increase of RDX content..

Keywords

PBX, Mechanical response, SHPB.

Citation

XUANMING CAI, WEI ZHANG, DACHENG LI, WENBO XIE, Study on dynamic mechanical response of a polymer bonded explosive under high strain rates, Optoelectronics and Advanced Materials - Rapid Communications, 9, 3-4, March-April 2015, pp.502-506 (2015).

Submitted at: May 13, 2014

Accepted at: March 19, 2015