||Forensic Finite Element Simulation of Skull Fracture
||Skytte, Tina Lercke (Materials Research Division, Risø National Laboratory for Sustainable Energy, Technical University of Denmark, DTU, DK-2800 Kgs. Lyngby, Denmark)
||Technical University of Denmark, DTU, DK-2800 Kgs. Lyngby, Denmark
||The aim of this master's thesis is to construct 3D models of human skulls intended for
investigation of skull fractures in forensic practice. Six models of the upper part of the
skull bone were created from CT scans of humans and imported into the nite element
software Abaqus. To model the propagation of a fracture, the extended nite element
method was used, with damage for traction separation laws and maximum nominal stress
as the damage criterion. Damage evolution was dened by energy.
The models were used to investigate variations in the mechanical response between dierent
skulls, to determine, if it is necessary to construct a specic model for each skull. Large
dierences in the stiness of the skulls were found, but also the pattern of the damaged
region varied. A parametric study showed, that the response of the models depend on the
fracture energy and the nominal stresses. An increase in the fracture energy, reduce the
size of the region of damage, as well as the severity of the damage. Changes in the nominal
stresses had a huge eect on the models. By increasing all three of the nominal stress, the
size of the fracture is reduced, while a decrease in the nominal stresses results in excessive
damage. A change in one of the nominal stresses, may relocate the region of damage to
other elements at the top of the skull.
Further improvements of the models are needed, before they can be used in forensic practice.
This also includes a validation of the models.
||Danmarks Tekniske Universitet, Risø Nationallaboratoriet for Bæredygtig Energi : Roskilde
||Materialer og energilagring; Materials and energy storage; Lette stærke materialer til energiformål; Light strong materials for energy purposes
Creation date: 2010-10-20
Update date: 2010-12-01