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Towards the investigation of shooting incidents: evaluation of fracture pattern on polymethylmethacrylate sheet made by .2200 and .17700caliber air rifle
به سمت بررسی حوادث تیراندازی: ارزیابی الگوی شکستگی روی ورق پلی متیل متاکریلات ساخته شده توسط تفنگ بادی کالیبر 2200 و .170000-2020 Scientific examination of the physical evidence provides significant information beyond a reasonable doubt. Due
to the increasing use of the glassy polymer i.e. polymethylmethacrylate instead of glass, the probability of the
occurrence of the fractured polymethylmethacrylate sheet in a shooting incident cannot be ignored. Analysis of
fracture pattern offers several analytical approaches that assist the forensic investigator. The use of air guns in
criminal activities is increasing as well as these weapons have found to be fatal for living beings. This study was
conducted to evaluate the fracture pattern on the polymethylmethacrylate by using an air rifle. The fracture
pattern formed on polymethylmethacrylate sheets by the air guns shows some specific characteristics that may
help to reconstruct the crime scene. The polymethylmethacrylate sheets were test-fired with Spring-Piston air
rifles of .2200 (5.5 mm) and .17700 (4.5 mm). Data obtained from the measurements were then statistically analysed
with the Chi-Square test. A consistency in hole diameter was observed. Analysis of fracture patterns may provide a
lead to the investigator and may help to reconstruct a shooting incident. It can also distinguish between the
standard firearm and air gun. The fracture on polymethylmethacrylate sheets gave significant findings that may
efficaciously contribute to the forensic investigation of shooting incidences. Keywords: Materials science | Mechanical engineering | Mechanics | Polymethylmethacrylate | Air rifle | Fracture pattern | Shooting incident | Physical evidence | Glassy polymer |
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