Dresden 2020 – scientific programme

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MM: Fachverband Metall- und Materialphysik

MM 30: Poster Session II

MM 30.13: Poster

Tuesday, March 17, 2020, 18:15–20:00, P4

Fracture Matching of Metals in Forensic Science — •Jens Balzer, Bert Weimar, Horst Katterwe, and Werner Deinet — Kriminaltechnisches Institut, Bundeskriminalamt, 65173 Wiesbaden

The comparison of marks caused by firearms and tools as well as of marks on fracture surfaces is of great importance in forensic sciences. Very often a forensic laboratory is asked to prove whether two or more pieces of a broken metal originally were part of one and the same object. Examiners magnify the marks using comparison light microscopes or comparison scanning electron microscopes. In a pattern fit analysis the matching is based on characteristic features of the fracture surface. Sometimes the question arises whether the degree of similarity is sufficient to make the statement that the two broken pieces were originally one.This corresponds in the toolmark case to the question, if two marks were produced by the same tool. For these, efforts have been made to obtain objective criteria for an identification using probability theory models. References: 1) Voss-de Haan, Katterwe, Simross *Physik in der Kriminaltechnik*, Physik Journal 2, 35, 2003; 2) Katterwe, Körschgen, Ahlhorn *Proceedings Marks*, ISBN 3-00-009338-9, Berlin 2001; 3) Katterwe *Fracture Matching*, AFTE Journal 37, 229, 2005; 4) Weimar, Katterwe, Braune *Formspuren* in Widmaier *Strafverteidigung*, Beck 2014; 5) Katterwe, Braune, Körschgen, Radke, Weimar *Comparison SEM in Forensic Science*, AFTE Journal 41, 283, 2009; 6) Stone *Probabilistic Model of Fractures in Brittle Metals*, AFTE Journal 36, 297, 2004; 7) Deinet, Katterwe *Probability Models*, AFTE Journal 39, 4, 2007.