Researchs On The Constitutive Behavior Of Three Kinds Of Energetic Materials

Energetic materials are the main charge of weapon and the dynamical energy resource for widely uses. The safeties of energetic materials under different condition are very important by no means for each use. The study of damage and mechanical performance of energetic material become more important.In this paper, three energetic materials have been studied on their material dynamical performance, damage mechanics and constitutive relation, etc.(1) The dynamic compressive stress-strain curves of the three energetic materials are obtained at different strain rates from 10'3 s-1 to 1000 s-1 by both SHPB tests and quasi-static compressive tests. A pulse shaping technique has been used in split Hopkinson bar (SHPB) experiment, for ensuring the specimen in dynamic stress equilibrium and loaded under constant strain rate during the test.(2) Mechanical performance of the three energetic materials is examed based on the compressive stress-strain curves at different strain rates which show the strain rate effects for the three energetic materials parameters.(3) The surface of raw materials and the fracture surface of the tested specimen have been observed by scanning electron microscope (SEM) and the characteristics on microstructures are obtained. The fracture mechanism of PBX and Comp.B under low strain rates compression is analysed, and the damage evaluation equations for the three energetic material under low strain rates compression have been derived.(4) According to the experimental results of the three energetic materials under different strain rates, the constitutive relations have been derived for the compression behavior of the three energetic materials, which agrees well with the results of static and dynamic tests.The jobs of this dissertation reveal some characteristics of mechanical behaviors of the three energetic materials. All the experimental results and recognization in this paper provide a good exploration for the further research and application of mechanical behavior of energetic materials.