Textile Engineering Faculty, Amirkabir University of Technology (Tehran Polytechnic), Tehran, Iran.
Textile Engineering Faculty, Amirkabir University of Technology (Tehran Polytechnic), Tehran, Iran.
Forensic Sci Int. 2020 Jan;306:110097. doi: 10.1016/j.forsciint.2019.110097. Epub 2019 Nov 29.
In this study, the penetration procedure of sharp objects with various geometries in the fabric was considered. To this end, five objects consisted of two single edged knives, a double edged knife and two spikes were employed. Tests were performed on fabrics with different applications such as shirting, worsted, elastic denim, artificial leather and tarpaulin. The fabric's tensile behavior and the tools geometry were probed. Then, the stab resistances of fabrics against mentioned devices were examined and their penetration force, depth and energy were considered. Outcomes illustrated that tool's geometry has a determinant influence on the stabbing parameters. Fabrics with lower tensile modulus extend easily; therefore, higher penetration depth was obtained and this fact postponed the penetration phenomenon. In addition, the increase in the fabric's strength resulted in higher penetration force. A direct relation was achieved between sharp tool's geometry and fabrics destruction, in a way that damages obtained by knives are straight and slim line with cut yarns and fibers in the cross-section; however, the penetration of spikes makes damage with a circle shape and torn and protruded fibers are observed in the cross-section.
在这项研究中，考虑了具有不同几何形状的锐器在织物中的穿透过程。为此，使用了两种单刃刀、一种双刃刀和两种尖刺的五种物体进行了测试。测试对象是具有不同用途的织物，如衬衫、精纺、弹性牛仔布、人造革和防水油布。研究了织物的拉伸行为和工具的几何形状，然后检查了织物对上述设备的抗刺能力，并考虑了它们的穿透力、深度和能量。结果表明，工具的几何形状对刺戳参数有决定性的影响。拉伸模量较低的织物容易伸展，因此获得了更高的穿透深度，这一事实推迟了穿透现象。此外，织物强度的增加导致了更高的穿透力。锐器的几何形状与织物的破坏之间存在直接关系，刀具造成的损坏是直线和细长的，横截面中有切断的纱线和纤维；然而，尖刺的穿透会造成圆形的损伤，并且在横截面中可以观察到撕裂和突出的纤维。
