Citation

Aliverdipour N, Ezazshahabi N, Mousazadegan F. Forensic Sci. Int. 2019; 306: e110097.

Affiliation

Textile Engineering Faculty, Amirkabir University of Technology (Tehran Polytechnic), Tehran, Iran. Electronic address: f_mousazadegan@aut.ac.ir.

Copyright

(Copyright © 2019, Elsevier Publishing)

DOI

10.1016/j.forsciint.2019.110097

PMID

31821941

Abstract

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.

Copyright © 2019 Elsevier B.V. All rights reserved.

Language: en

Keywords

Penetration; Sharp objects; Stab resistance; Tensile modulus