A method for studying knife tool marks on bone |
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Authors: | Shaw Kai-Ping Chung Ju-Hui Chung Fang-Chun Tseng Bo-Yuan Pan Chih-Hsin Yang Kai-Ting Yang Chun-Pang |
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Affiliation: | Department of Forensic Pathology, Institute of Forensic Medicine, Ministry of Justice, Taipei, Taiwan. kpshaw596@gmail.com |
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Abstract: | The characteristics of knife tool marks retained on hard tissues can be used to outline the shape and angle of a knife. The purpose of this study was to describe such marks on bone tissues that had been chopped with knives. A chopping stage with a gravity accelerator and a fixed bone platform was designed to reconstruct the chopping action. A digital microscope was also used to measure the knife angle (θ) and retained V-shape tool mark angle (ψ) in a pig skull. The κ value (elasticity coefficient; θ/ψ) was derived and recorded after the knife angle (θ) and the accompanied velocity were compared with the proportional impulsive force of the knife and ψ on the bone. The constant impulsive force revealed a correlation between the V-shape tool mark angle (ψ) and the elasticity coefficient (κ). These results describe the tool marks--crucial in the medicolegal investigation--of a knife on hard tissues. |
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Keywords: | forensic science forensic anthropology biomechanical study bone trauma tool marks digital microscope |
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