Technique for Combined Dynamic Compression–Shear Testing of PBXs

Abstract

We modify the split Hopkinson pressure bar and propose a compression-shear experimental method to investigate the dynamic behavior of polymer-bonded explosives (PBXs). The main apparatuses used include an incident bar with a wedge-shaped end and two transmission bars. We employ Y-cut quartzes with a rotation angle of 17.7°to measure the shear force and an optical system for shear strain measurement. A PBX with a density of 1.7 g/ cm 3 is investigated using the proposed method. Experimental results show that the specimen endures both compression and shear failure. Compression failure stress rises, and shear failure stress decreases as the strain rate increases. The sequences of shear and compression failure times are various at different strain rates. Based on the maximum shear failure criterion, we conclude that these phenomena are related to the experimental loading path.

Time-Resolved Dynamic Friction Testing of a Polyurethane Foam Against a Polymer/Clay Nano-composite Under Impact Loading

“…Since the total thickness of specimen, transducers and sheets is small, the dynamic stress equilibrium in the specimen can be obtained in most cases, which is similar to that in SHPB experiment [24]. The force measured by the transducers can be considered as the interfacial force, which has already been proved in published works [25,26]. According to the Coulomb's law of friction [27], the friction coefficient l is the ratio of friction force F to normal pressure N.…”

Time-resolved x-ray diffraction techniques for bulk polycrystalline materials under dynamic loading

“…[25][26][27] We expect, therefore, that the techniques described here can readily be adapted to a wide range of loading conditions. It should also be possible to combine in situ diffraction with in situ radiography and/or phase contrast imaging (as has previously been done in the context of rapid phase transformations 28 ).…”

Development of a True-Biaxial Split Hopkinson Pressure Bar Device and Its Application

“…However, the data processing is complicated by the shear stress wave produced in the steering heads from the incident bar to the cube specimen. Zhao and Lu et al [ 48 , 49 ] proposed a compression-shear experimental device with a wedge-shaped incident bar and two transmission bars, which could not only apply compression-shear load to the specimen, but also generate two transmission stress waves that propagate synchronously, the design of which can provide a good reference for the research of this paper. In this paper, the method including a striker bar strikes two incident bars or three incident bars is referenced, and a DWB is designed and applied into the development of biaxial SHPB.…”