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The development of a stabbing machine for forensic textile damage analysis.
Natasha Benson1, Robson Oliveira dos Santos2, Kate Griffiths3
1University of Technology Sydney, Centre for Forensic Science, PO Box 123, Broadway, NSW 2007, Australia.
Forensic Science International
|March 9, 2017
Summary
A novel horizontal stabbing machine was developed to precisely simulate stab events, offering reproducible positioning and variable force for forensic analysis. This tool aids in understanding textile damage from various stabbing scenarios.
Area of Science:
- Forensic Science
- Mechanical Engineering
- Materials Science
Background:
- Simulating stab events is crucial for forensic investigations.
- Existing methods may lack precision and reproducibility.
- Developing standardized tools is essential for reliable analysis.
Purpose of the Study:
- To develop and validate a horizontal stabbing machine for simulating stab events.
- To assess the machine's reproducibility and force control capabilities.
- To evaluate the instrument's utility in analyzing textile damage.
Main Methods:
- A horizontal stabbing machine with a motorized arm and pneumatic system was designed.
- The machine delivers 60 unique stabbing positions with high reproducibility (SD < 1.0mm x-axis, < 2.3mm y-axis).
- Variable force application up to ~221N and interchangeable knife holders were incorporated.
Main Results:
- The machine demonstrated robust mechanics and highly reproducible positioning.
- Stab simulations were conducted using four different knives and nine penetrating angles.
- Severance length and textile damage were measured to evaluate the instrument's suitability.
Conclusions:
- The developed horizontal stabbing machine provides a reliable and reproducible method for simulating stab events.
- The instrument's capabilities allow for detailed analysis of textile damage under controlled conditions.
- This tool has significant potential for enhancing forensic investigations and material testing.