Abstract
This study focused on the impact load produced by a projectile and its potential application in the Taylor impact test. Taylor impact tests were designed and carried out for projectiles with four types of nose shapes, and the impact deformation characteristics and variation of the impact load as a function of the nose shape and impact velocity were studied. The overall high g loading experienced by the projectile body during the impact was discussed, and based on classical Taylor impact theory, impact analysis models for the various nose-shape projectiles were established and the causes of the different impact load pulse shapes were analyzed. This study reveals that the nose shape has a significant effect on the impact load waveform and pulse duration characteristics, while the impact velocity primarily affects the peak value of the impact load. Thus, the loading of specific impact environments could be regulated by the projectile nose shape design and impact velocity control, and the impact load could be simulated. Research results support the assumption that the Taylor impact test can be applied to high g loading test.
Highlights
In the process of a precision attack on targets, the internal electronic equipment of advanced penetration weapons typically experience impacts that are several milliseconds in duration and tens of thousands of g (g = 9.8 m/s2) in magnitude
The specific information and results of each test are summarized in Table 3, where m is the projectile mass; L0 is the initial projectile length; Di is the initial nose diameter; Dc is the projectile cylindrical segment diameter; v0 is the impact velocity; Lf and Df are the projectile residual length and top diameter recovered after the test, respectively; F is the peak load produced by the impact; τ is the duration of loading; and ap is the peak acceleration, obtained by dividing the peak impact load by the projectile mass
One of the important characteristics of the Taylor impact test is that the sample nose undergoes a large plastic deformation, while the tail remains elastic
Summary
Under laboratory conditions, the main simulation methods of high-impact environments include the Machete hammer test, the Split-Hopkinson pressure bar (SHPB), and the drop tower test These methods can typically provide only a small impact energy, a short acceleration duration, and the test piece size is generally limited to dozens of grams, which is difficult to apply in the assessment of subsystem and component products with a large mass. In the SHPB test [18], the shape of the incident wave is controlled in two ways: one is by adding a waveform shaper at the impact end, and the other is by using bullets with a special shape designed to obtain the required incident waveform [19] In the latter, the waveform indicating the duration of the load generated by the impact can be adjusted by changing the nose shape of the projectile.
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