Jacobsen, C.

Lynnerup, N.

Mikkelsen, Lars Pilgaard

Sölvadóttir, A.E.

Thomsen, H.R.

Online Research Database In Technology

                       General rights Copyright and moral rights for the publications made accessible in the public portal are retained by the authors and/or other copyright owners and it is a condition of accessing publications that users recognise and abide by the legal requirements associated with these rights.  • Users may download and print one copy of any publication from the public portal for the purpose of private study or research. • You may not further distribute the material or use it for any profit-making activity or commercial gain • You may freely distribute the URL identifying the publication in the public portal   If you believe that this document breaches copyright please contact us providing details, and we will remove access to the work immediately and investigate your claim.     Downloaded from orbit.dtu.dk on: Dec 19, 2017Forensic FE study of skull fractureMikkelsen, Lars Pilgaard; Sölvadóttir, A.E.; Thomsen, H.R.; Lynnerup, N.; Jacobsen, C.Publication date:2009Link back to DTU OrbitCitation (APA):Mikkelsen, L. P., Sölvadóttir, A. E., Thomsen, H. R., Lynnerup, N., & Jacobsen, C. (2009). Forensic FE study ofskull fracture. Poster session presented at Stiftende generalforsamling og første årsmøde i Dansk BiomekaniskSelskab, Göteborg (SE), 17-18 Sep., .Forensic FE-Study of Skull FractureL.P. Mikkelsen, A.E. Sölvadóttir*) and H. R. Thomsen*), Materials Research Division, Risø DTU, RoskildeN. Lynnerup, C. Jacobsen, Department of Forensic Medicine, University of Copenhagen*)Now at Novo Nordisk A/S, HillerødAn important issue in forensic medicine is to determine how a specific skull fracture arose. This information can be critical for establishing if a criminal offense has taken place. Based on  CT-scan of an autopsy case, a full 3-D finite element model of a skull was built up in the commercial dynamic finite element code Abaqus/Explicit. The skull was exposed to a short dynamic impact from a blunt object and a simple element-removing algorithm describing the fracture process in the finite element model was used. Based on the simulations, a large sensitivity of the fracture modes was found even for small changes in the initial speed of the incoming object. Dependency on speed of incoming object7.3 /v m s= 2.5 /v m s=CT DICOMCut and labelling materialBuilt up 3-D structure-scan as Predicted and observed crack patternConclusionThe predicted and observed fracture patterns differ from each other for the specific case. This may be due to some of the simplifications used in the model as well as Surface representation, smoothening and exported as STL-filethe representation of the actual dynamic impact. A more realistic finite element model should take into account the real cranial vault structure, incorporating a spongy bone layer with a low density between two compact bone layers. In addition, the effects of the sutures between the single cranial bones should be included, as well as a more realistic dynamic fracture process simulation.Dynamic 3-D finite element model in Abaqus/Explicit with a mesh fixed to a triangle surface mesh from the STL representation

Forensic FE study of skull fracture

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Forensic FE study of skull fracture

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