Abstract
Taylor impact test is characterized by high impact energy, low cost, and good repeatability, giving it the technical foundation and development potential for application in high-g loading. In this paper, the feasibility of performing high-g load impact testing to a missile-borne recorder by conducting Taylor impact test was studied by combining simulation analyses with experimental verification. Acccording to the actual dimensions of the missile-borne recorder, an experimental piece was designed based on the Taylor impact principle. The impact loading characteristics of the missile-borne recorder were then simulated and analyzed at different impact velocities. In addition, the peak acceleration function and the pulse duration function of the load were fitted to guide the experimental design. A Taylor-Hopkinson impact experiment was also conducted to measure the impact load that was actually experienced by the missile-borne recorder and the results were compared with the results of strain measurements on the Hopkinson incident bar. The results showed that the peak value of impact load, the pulse duration and the waveform of the actual experimental results were in good agreement with the results predicted by the simulations. Additionally, the strain data measured on the incident bar could be used to verify or replace the acceleration testing of the specimen to simplify the experimental process required. Based on the impact velocity, high-g loading impact was achieved with peak values in the 7,000–30,000 g range and durations of 1.3–1 ms, and the waveform generated was a sawtooth wave. The research results provide a new approach for high amplitude and long pulse duration impact loading to large-mass components, and broaden the application field of Taylor impact test.
Highlights
IntroductionAdvanced penetrating weapons such as the ordnance penetrator can sense environmental information and control their burst point using the electronic equipment on the bomb (e.g., smart fuze, missile-borne recorder) when striking the target, maximizing the damage and effectiveness of the weapon
Advanced penetrating weapons such as the ordnance penetrator can sense environmental information and control their burst point using the electronic equipment on the bomb when striking the target, maximizing the damage and effectiveness of the weapon
The results show that the rising edge of the load becomes steeper and the peak value of impact load increases significantly with increasing impact velocity
Summary
Advanced penetrating weapons such as the ordnance penetrator can sense environmental information and control their burst point using the electronic equipment on the bomb (e.g., smart fuze, missile-borne recorder) when striking the target, maximizing the damage and effectiveness of the weapon During this process, the onboard electronic equipment generally needs to experience an impact of tens of thousands of g (where 1 g 9.8 m/s2) with a duration of several milliseconds. Under laboratory conditions, the main methods used for high impact environment simulations are the Machete hammer test, the drop tower test and the Hopkinson bar test Among these methods, the Machete hammer test is commonly used in safety testing of energetic materials and in impact tests to verify the cushioning performances of potting materials (Li et al, 2016) The experimental operation required for this test is simple but the impact duration is short (generally tens of microseconds) and the load consistency is poor. Rocket sled experiments and airdrop experiments enable realistic impact environments, but these test methods are expensive, with long cycle times and poor repeatability, which means that they are not suited to performing large numbers of research experiments
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