Study On The Influence Of Zr-based Active Fragment States On Impact Energy Release

With the increasing diversity of threats from the air,the importance of air defense operations has become increasingly prominent,and its success or failure has become a decisive factor in the success or failure of modern high-tech warfare.The traditional inert fragment damage element of air defense warheads relies on a single kinetic energy to strike targets,which can no longer meet the requirements of modern efficient military applications.In this era,new active materials with both mechanical properties and energy release characteristics have gradually entered the field of vision of researchers.Countries are actively exploring and developing new energetic materials containing active metals to enhance the efficient damage ability of warheads.Zirconium based active materials are currently a research hotspot in active materials due to their excellent mechanical properties and energy density.Due to the close correlation between the impact response and energy release behavior of materials and their mechanical properties,this article selects and prepares two types of zirconium based metal type active materials,and conducts in-depth research on their mechanical properties and impact reaction mechanism.A metal type active fragment was designed and prepared using active metal zirconium(Zr)as the main raw material.Design and study the sintering temperature and process to obtain Zr/W material samples prepared by hot pressing sintering process;Different shapes of zirconium titanium(Zr/Ti)based bulk amorphous alloy fragments were designed,and cubic specimens with a side length of 8 mm and cylindrical specimens with a diameter and height of8 mm were selected as experimental and numerical simulation research objects.Using a universal material testing machine MTS and a split Hopkinson compression bar SHPB experimental device,experimental studies were conducted on Zr/W fragments under quasi static and dynamic compression at room temperature.The results showed that Zr/W samples exhibited different mechanical properties before and after sintering.The material before sintering exhibited a failure mode of compression brittle fracture,and the material after sintering exhibited strong ductility during compression,resulting in significant plastic deformation under static compression.Compare the mechanical behavior of samples under different strain rates,and analyze the mechanism of fracture at medium and low strain rates.The material exhibits strain rate sensitivity.The experimental study on compression of Zr/Ti based amorphous alloy materials shows that the zirconium based amorphous alloy undergoes brittle fracture under compressive load,accompanied by the formation of Mars during fracture,and the debris particles formed by local compression brittle fracture are ignited in the air;The fracture characteristics of amorphous alloy samples with different shapes are different,and the stress distribution under load is different.The static pressure elastic modulus of amorphous alloy cylinder samples is larger than that of cube samples.A ballistic impact energy release test was designed to investigate the temperature release of two types of zirconium based active fragment impact energy release sealing devices under different operating conditions.Use a transient temperature testing device to test the temperature time history curve,observe the damage effect of the impact end cover,observe the damage effect of the aluminum plate on the front end cover of the sealing box,and recover the broken samples in the energy release sealing device.The severity of the chemical reaction of the active material during the impact process is analyzed from the test temperature,the damage effect of the sealing device end cap,and the crushing reaction state of the recovered sample.The process parameters of shock energy release reaction were analyzed,and the reaction mechanism was explained accordingly.On the basis of experiments,numerical simulation of the high-speed impact process of Zr based amorphous alloy fragments was carried out,and the energy release characteristics,fragmentation degree,and stress distribution of two types of active fragments were compared.Based on the mechanical properties of materials,appropriate constitutive models were selected to simulate the impact mechanical response characteristics of the finite element model,and different types of zirconium based active fragments were analyzed.The research results in this paper can provide support for the structural design of active fragment warheads,provide a reference scheme for the testing and analysis of macroscopic impact energy release characteristics parameters of active materials in the fields of amorphous alloys,weapons engineering,and other fields,and have important practical significance and application value for guiding the development of efficient damage warhead technology in the future and improving the damage power of weapons and ammunition.