Dynamic Mechanical Properties Of Tungsten Zirconium Active Material

Active material is a new kind of damage material,and the wounded fragment made of this material has good mechanical strength,and at the same time,the impact or explosion effect will be produced rapidly when the target is hit at high speed,at the same time,a large amount of heat and chemical energy are released,which results in better damage to the target.Because of the special properties of active materials,there will be a great prospect in the military field.In this paper,the preparation process,mechanical properties and shock response characteristics of zirconium tungsten active materials were studied.The main work of this paper is:Two kinds of tungsten zirconium active materials were prepared by compression sintering process,and the static compression test of the specimen was carried out by universal material testing machine.The results show that the specimens are cracked in axial cleavage,which is a typical brittle material.In the process of compression sintering,there are many micro defects in the material.When the compression test occurs,the crack initiates and accompanies the sound,corresponding to the energy release,the specimen is broken and unloaded instantaneously and accompanied by sparks.The dynamic mechanical properties of tungsten zirconium active materials were studied by SHPB experimental equipment.The dynamic stress-strain curves of three kinds of zirconium materials with different strain rates were obtained.The results show that the compressive strength and critical strain of zirconium tungsten active materials become larger with the increase of strain rate,and there is an obvious strain rate effect.Based on the one-dimensional elastic brittle damage model and the experimental data,the constitutive equations of zirconium and tungsten active materials are fitted.The impact reaction process of tungsten zirconium active materials under impact loading was obtained by means of high-speed camera.Under impact loading,the specimen rapidly breaks into tiny particles,forming dust clouds in the local space.When the concentration reaches a certain level,the heat generated during the fragmentation of the specimen is ignited.The specimens with large loading speed had a short reaction time and a severe reaction.At the same strain rate,the reaction time of the specimens with high zirconium content is long and the reaction degree is severe.The penetration process of tungsten zirconium active material to steel target plate was studied by using 12.7mm caliber ballistic gun.In the process of collision,fragments are broken due to great impact and release large amounts of light and heat.Specimens of the same ratio,the depth of the test holes increases with the increase of speed,but the three groups test under almost constant aperture.The highest reaction temperature obtained by the high-speed infrared imager is related to the material ratio.The samples with more zirconium content give more energy when the reaction occurs,the reaction degree is large,and the reaction temperature is high.For specimens of the same proportion,the specimens with high penetration rate have severe reaction degree and high reaction temperature.