Investigation of the impact behavior of windowpane glass plates by low velocity 9mm spherical projectile.

Ahuja P.; Panchal A.; Dahiya M S

Volume : VI, Issue : IX, September - 2017

Investigation of the impact behavior of windowpane glass plates by low velocity 9mm spherical projectile.

Ahuja P. , Panchal A. , Dahiya M S

Abstract :

In cases involving Firearms, it is very multifaceted work to investigate and authenticate cause behind the crime. In real life cases which involve glass as a target or mid target, it is very difficult to determine the distance of shooting. For near distance firing, GSR evaluation is effective, but the need of the day is to stronger the investigation for all firing ranges. For material like Glass panels or Glass windows, glass fractures when found in ballistic cases can help in evaluation of distance of firing and even velocity of fire. In this study, glass plates of equivalent dimensions were coated with thin film lamination and subjected to impact by projectiles at varying distance. The assessment firing was carried out at Ballistic Testing Range existing in our campus, during the assessment 9mm Projectile were impacted on the glass plates with velocity around 400 � 20 m/s. Experiments were carried out to obtain basic data for estimating the impact distances of projectiles from the morphology of the fracture. Projectiles of 9mm caliber were shot onto laminated windowpane glass plates firmly held around a frame. It was assumed that impact distance would create differences in surface tension on the glass plates, which in turn affects the fractography of glass under observation. A strong experimental correlation was found between fractures and the impact distances. A unique relationship was obtained between crack area and impact distance from the numerical analysis of the fracture of the glass plates.