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| Test method for interior ballistic mechanical characteristics of series launched projectile |
| HANG Yu, KONG Deren, SHANG Fei |
| School of Mechanical Engineering ,Nanjing University of Science and Technology, Nanjing 210094，China |
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Abstract Aiming at measuring the projectile’s interior ballistic mechanical properties of small caliber series launch weapon, a simultaneous measurement method based on the storage testing technology was proposed for the bottom pressure and front pressure of the projectile. Simulated projectiles and small Polyvinylidene Difluoride（PVDF） piezoelectric force sensors were designed. Two force sensors were used as the simulated projectile’s bottom screw and head screw component to withstand and measure the projectile’s bottom pressure and front pressure. The system’s measurement equation under high-overload ballistic environment was derived according to the mechanical analysis of the force sensor. The influence of the mass and the thickness of the force transmission block, the thickness and the area of the PVDF film on the dynamic characteristics and temperature rise of the sensor were analyzed. The sensitivity of the force sensor was analyzed and the calibration experiment was carried out. The results shown that the greater the preload of the PVDF film, the lower the sensor’s sensitivity. The calibration results were consistent with the theoretical analysis. A series launch test was carried out based on two simulated projectiles, and the measured interior ballistic mechanical properties of the projectiles were in accordance with the numerical simulation results.
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Received: 16 September 2020
Published: 15 February 2022
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