Imre Bojtar

Budapest University of Technology and Economics · Department of Structural Mechanics

Recent reports have highlighted a notable prevalence of atypical hangman's fractures, yet their biomechanical aspects remain underexplored. Using a validated finite element model, this study assesses changes in rotation-moment characteristics of the upper cervical spine due to fractures involving the superior and inferior articular process, pars in...

Purpose Management of Anderson and D’Alonzo type II odontoid fractures continues to be controversial despite extensive research and increasing prevalence. To the authors' knowledge, the three odontoid ligaments, the alar ligament, the vertical portion of the cruciate ligament, and the transverse ligament, have not been biomechanically examined in t...

The human neck is vulnerable to dynamic loads that are not so uncommon in everyday life such as vehicular accidents, falls, or sport accidents. The damage due to these events can easily lead to catastrophic consequences such as paraplegia or death. In short, there is still a need to better understand the mechanical behavior of the cervical spine. I...

A high-speed study of tempered glass fracture propagation is presented. Tempered glass is used worldwide both architecturally and in the automotive industry, often playing a role in structural integrity. To accurately predict the brittle failure of the structural elements, it is essential to study crack initiation and formation. Cracks were initiat...

Present work is focused on the investigation of soda-lime-silica glass. The material is completely amorphous, therefore a 3D random network generation was done to produce the initial geometry. The systems were verified with neutron diffraction results. The simulation was done in two steps. First the geometry was generated and verified, then the sys...

This study deals with a statistically defined mechanical effect of the inhomogeneities remaining in structural glass plates after the manufacturing by floating process. Our goal was to define a stress limit that will not be exceeded with a 95% probability. We used Monte Carlo simulation to calculate the stress peaks that appear in structural glass....

This study was performed to assess the effect of aneurysm geometry on parameters that may have an impact on the natural history of intracranial aneurysms, such as intraaneurysmal flow pressure and shear stress. Flow was simulated in 21 randomly selected aneurysms using finite volume modeling. Ten aneurysms were classified as side-wall aneurysms, wi...

Numerical flow simulations have been performed on simplified artificial intracranial aneurysm models, as well as on real models obtained from rotational digital subtraction angiography images. The simplified geometries provide a basic understanding of the flow and allow the study of the influence of certain geometrical parameters with high accuracy...

The presentation is focused on the analysis of biophysical properties of cerebral aneurysms, diagnosed and delineated in living human individuals. An aneurysm is a bulging out of a part of the wall of a blood vessel. The aim of our research was to delineate flow patterns inside the aneurysm and its parent artery, to estimate stresses at critical po...

In the first part of this two-part study the possible uses of finite element analysis in studying the stress transmission of dental implants were reviewed. In the present second part our own experiments are presented. In the first series the effect of the geometric parameters and load types on mechanical stresses arising around cylindrical implants...

This paper focuses on the analysis of the haemodynamic pattern and biophysical properties of cerebral aneurysms, diagnosed and delineated in living human individuals. An aneurysm is a bulging out of part of the wall of a blood vessel. The aim of the research is to delineate flow patterns inside the aneurysm and its parent artery, to estimate stress...

Cardiovascular disease is one of the most frequent reasons of mortality in the western word. Nowadays the mechanical properties of biological soft tissues were treated from a continuum mechanical perspective. The aim of this article is to investigate the mechanical response of arterial tissue. We present some three-dimensional finite element model...

Koponyaűri aneurysmák áramlástani elemzését végeztük idealizált 2D és 3D geometriai modelleken valamint valós aneurysmákról készült rotációs angiográfia 3D rekonstrukciójából készült véges elemes modelleken, számítógépes áramlás szimulációval. Idealizált modelleken összefüggést találtunk az aneurysma bemeneti nyílásának ("nyak") átmérője illetve te...