Table of Contents Author Guidelines Submit a Manuscript
International Journal of Aerospace Engineering
Volume 2017, Article ID 3616932, 15 pages
https://doi.org/10.1155/2017/3616932
Research Article

Nonlinear Material Behavior Analysis under High Compression Pressure in Dynamic Conditions

1School of Mechanical and Manufacturing Engineering, National University of Sciences and Technology, Islamabad, Pakistan
2Université Catholique de Louvain, Louvain-la-Neuve, Belgium
3Birmingham City University, Birmingham, UK
4School of Mechanical Engineering, Beijing Institute of Technology, Beijing, China

Correspondence should be addressed to Shahid Ikramullah Butt; kp.ude.tsun.emms@dihahsrd

Received 25 February 2017; Revised 7 June 2017; Accepted 4 July 2017; Published 29 August 2017

Academic Editor: Paul Williams

Copyright © 2017 Muhammad Zubair Zahid et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Gun chamber pressure is an important parameter in proofing of ammunition to ensure safety and reliability. It can be measured using copper crushers or piezoelectric sensor. Pressure calculations in copper crusher method are based on linear plastic deformation of copper after firing. However, crusher pressure deformation at high pressures deviates from the corresponding values measured by piezoelectric pressure transducers due to strain rate dependence of copper. The nonlinear deformation rate of copper at high pressure measurements causes actual readings from copper crusher gauge to deviate from true pressure values. Comparative analysis of gun chamber pressure was conducted for 7.62 × 51 mm ammunition using Electronic Pressure, Velocity, and Action Time (EPVAT) system with piezoelectric pressure transducers and conventional crusher gauge. Ammunitions of two different brands were used to measure chamber pressure, namely, NATO standard ammunition and non-NATO standard ammunition. The deformation of copper crushers has also been simulated to compare its deformation with real time firing. The results indicate erratic behavior for chamber pressure by copper crusher as per standard deviation and relative spread and thus prove piezo sensor as more reliable and consistent mode of peak pressure measurement. The results from simulation, cost benefit analysis, and accuracy clearly provide piezo sensors with an edge over conventional, inaccurate, and costly method of copper crusher for ballistic measurements due to its nonlinear behavior.