Author(s)

N. Ishikawa, N. Tanaka, Y. Nishimoto & T. Ohno

Abstract

The impact resistance of hybrid gel-rubber materials is studied experimentally by shooting bullets in order to collect the bullets after firing from the viewpoint of preventing the lead pollution. The shooting test is conducted by using a rifle and the residual velocity is measured in order to examine the effects of hybrid rubber materials, temperature and bullet type on the rubber depth. The shooting process of a bullet at the back face of rubber is also taken by the high-speed video. Finally, the effect of a hybrid rubber-steel plate on stopping bullets is also investigated. Keywords: rifle bullet, lead pollution, hybrid rubber materials, impact resistance, residual velocity. 1 Introduction Recently environmental problems have increased with the development of civilization and comfortable life-style of people. For instance, lead bullets after shooting have influenced pollution of soil near a firing range [1, 2]. Therefore, protective technology [3] has to solve the environmental pollution problems by making use of industrial materials [4]. This paper presents an experimental approach for the collection method of bullets by using various kinds of hybrid rubber materials for protection and prevention of contamination of lead bullets at firing range. First, the rubber depth of soft gel-rubber for stopping bullets is examined by measuring the residual velocity after shooting bullet at the initial velocity about 700m/s. Herein, the shooting process of a bullet is taken by a high-speed video

Keywords

rifle bullet, lead pollution, hybrid rubber materials, impact resistance, residual velocity.