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การวิเคราะห์รอยแตกของกระจกลามิเนตที่เกิดจากกระสุนปืนขนาด .22 Long Rifle ในมุมยิงที่ต่างกัน |
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| รหัสดีโอไอ | |
| Creator | เสกสรรค์ สโมสรสุข |
| Title | การวิเคราะห์รอยแตกของกระจกลามิเนตที่เกิดจากกระสุนปืนขนาด .22 Long Rifle ในมุมยิงที่ต่างกัน |
| Contributor | มาศฤดี หนูแป้น, วรดา สโมสรสุข, ธีรนันต์ นคินทร์พงษ์ |
| Publisher | King Mongkut’s University of Technology Thonburi |
| Publication Year | 2564 |
| Journal Title | KMUTT Research and Development Journal |
| Journal Vol. | 44 |
| Journal No. | 3 |
| Page no. | 381-394 |
| Keyword | Laminated Glass, .22 Long Rifle, Crack Mark, Ricochet Mark, Firing Angle |
| URL Website | https://journal.kmutt.ac.th/ |
| Website title | เว็บไซต์วารสารวิจัยและพัฒนา มจธ. |
| ISSN | 2697-5521 |
| Abstract | This research analyzed fractures on a laminated glass, kinetic energy of theprojectile exerted on the laminated glass and characteristics of bullets afterhitting the laminated glass when firing from different angles through thesimulation of firing a .22 long rifle at the same bullet velocity. Six-mm thicklaminated glass coated with 2-mm thick window film was shot from distancesbetween 550 and 650 yards at various angles, including 90, 60, 45, and 30degrees. The results revealed that at a firing angle of 90 degrees, bullet marksappeared on the laminated glass, forming concentric and radial fractureswithout penetrating into the glass. At angles of 60, 45, and 30 degrees, thebullets resulted in ricochet marks on the laminated glass, but not in crack.The width to length (W/L) ratio of ricochet mark and bullet hole could beused to calculate the angle of firing. In addition, bullet breakdown after hittingthe laminated glass could be used to calculate the firing angle. Microscopiccomparison procedure is more accurate than the calculation procedure whenit comes to the estimation of the firing angle from the size of the bulletentrance hole and concentric fracture or size of ricochet marks. Contactbetween the bullet and laminated glass led to kinetic energy change; kineticenergy loss of the bullet can cause the bullet to change its direction and alsomade fractures on the laminated glass, which would vary according to thefiring angle. |
