On the use of the force time histories to determine the shock and steady state interface pressures exerted by the impact of a low-strength projectile

PDF

Authors
  1. Nandlall, D.
  2. Gakwaya, A.
Corporate Authors
Defence Research and Development Canada, Valcartier Research Centre, Quebec QC (CAN)
Abstract
The work presented in this report examines the impact process of a 10% gelatine soft body material projectile striking a rigid target attached to a quartz force ring sensor. Using the shock Hugoniot relations and the conservations equations, a theoretical relation was obtained for the interface shock pressure. The Alekseevskii-Tate penetration equations were used to interpret and determine the steady state pressure applied to the target. Impact tests were conducted and the time histories of the force applied to the target were measured. The force-time curves were examined to identify frequencies that were present in the results and may be coming from the natural vibrations of the various parts that make up the target. Bessel function solutions for the wave equation applied to the free vibration of plates were used to identify and quantify the frequencies of the various plates in the target assembly. These unwanted frequencies were removed using the Savitsky-Golay filter. The shock pressures were then derived and very good comparison was obtained with the theoretical values predicted by the interface shock pressure equation developed. The Alekseevskii-Tate equation predicted very well the duration of the interaction between the projectile and the target. However, the measured value of the pressure was in discordance with the expected stagnation pressure, Pstagnation = 1/2ρv2 i . In accordance with the Alexseevskii-Tate equation, the results indicate the presenc

Il y a un résumé en français ici.

Keywords
Low strength material impact;Soft body material impact;shock pressure of gelatin impact;bird impact loading;bird strike;impact and shock loading to human surrogate materials;shock pressure from force history;shock experiments;gelatine impact;gelatine shock hugoniot;bird impact;human tissue impact
Report Number
DRDC-RDDC-2018-R161 — Scientific Report
Date of publication
01 Jul 2018
Number of Pages
60
DSTKIM No
CA046236
CANDIS No
806947
Format(s):
Electronic Document(PDF)

Permanent link

Document 1 of 1

Date modified: