Abstract：
:The formation of skull fractures is an important topic in legal medicine. In particular, the influence of boundary conditions is controversially discussed in the literature. A study focusing solely on this aspect was missing. This study aimed to investigate the influence of boundary conditions on the energy threshold for head fractures. Because of the great variability of biological tissue of real skulls, we opted for a head model made from a polyurethane sphere filled with gelatin. Furthermore, we decided to investigate two opposite situations: A fixed configuration where a model was placed on a rigid surface and a (quasi) free boundary configuration where the head model was held at a force of 5 N compensating for gravity. For both configurations, we determined the acceleration signal of the impactor, the force, and the energy threshold for head fracture. It turned out that the fracture forces for both configurations were the same whereas the energy threshold was 11.0 J for the fixed and 13.6 J for the free boundary. The difference seems to be negligible if compared to the effect of varying structural mechanical properties of real human heads. This means that in a forensic case, the two situations most probably cannot be distinguished. To investigate the influence of the impactor mass, we developed a mathematical model and fitted the experimental data. As a result, we found that in the free configuration, a larger mass increases the energy threshold for head fracture. So that in principle, the two configurations are distinguishable.
journal_name
Int J Legal Medjournal_title
International journal of legal medicineauthors
Siegenthaler L,Strehl M,Vaghi A,Zysset P,Kneubuehl BP,Frenz Mdoi
10.1007/s00414-019-02023-2subject
Has Abstractpub_date
2020-03-01 00:00:00pages
553-563issue
2eissn
0937-9827issn
1437-1596pii
10.1007/s00414-019-02023-2journal_volume
134pub_type
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pub_type： 杂志文章,多中心研究
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journal_title：International journal of legal medicine
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journal_title：International journal of legal medicine
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