Yiyang Chen
ABSTRACT
In the forensic injury identification work, the inference of the injury tool is very important, which directly affects the efficiency of tracking the murder weapon at the scene and the possibility of case detection. This article conducts an in-depth analysis of the inference process of injury tools based on fracture mechanics, elastic mechanics, and system control discipline models. First, for the wound conditions caused by sharp tools in different human body parts, a model based on the finite difference method was constructed to model the wound shape in detail. Through the analysis of wound boundary stress and related reasonable assumptions, the basic model of the wound formation process was determined. Secondly, the mechanism of collision between blunt injury tools and the human body was studied, a physical collision dynamics model was established, and the Laplace transform and finite difference method were used to solve the model. Finally, based on the aforementioned simulation results, an inversion model of the injury tool was constructed. In summary, this study uses the Westergard complex function method to quantify the lower boundary boundary conditions of the model. Calling the unit step function to simulate the actual force effect is beneficial to simplification of the model. Using multidisciplinary models and methods, through mathematical modeling and simulation analysis, the key issues regarding injury tools in forensic injury identification are solved, providing strong support for case detection.
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