Róbert Nagy

Róbert Nagy
Budapest University of Technology and Economics · Department of Structural Mechanics

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9
Publications
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73
Citations

Publications

Publications (9)
Article
The estimation of blood flow‐induced loads occurring on the artery wall is affected by uncertainties hidden in the complex interaction of the pulsatile flow, the mechanical parameters of the artery, and the external support conditions. To circumvent these difficulties, a specific tool is developed by combining the aorta displacements measured by an...
Article
Full-text available
We present a new algorithm to reconstruct the volumetric flux in the aorta. We study a simple 1D blood flow model without the viscosity term and sophisticated material model. Using the continuity law, we could reduce the original inverse problem related to a system of PDEs to a parameter identification problem involving a Riccati-type ODE with peri...
Article
In this paper a novel method is employed for the buckling analysis of thin-walled members. The method is basically a shell finite element method, but constraints are applied which enforce the thin-walled member to deform in accordance with specific mechanical criteria, e.g., to force the member to buckle in flexural, or lateral-torsional or distort...
Article
Full-text available
We present a novel numerical algorithm developed to reconstuct pulsatile blood flow from ECG-gated CT angiography data. A block-based optimization method was constructed to solve the inverse problem corresponding to the Riccati-type ordinary differential equation that can be deduced from conservation principles and Hooke's law. Local flow rate for...
Article
We aim to introduce a novel, inverse method for in vivo material parameter identification of human abdominal aortic aneurysms (AAA), which could overcome one of the greatest sources of uncertainty in patient-specific simulations, and could also serve as a rapid, patient-calibrated, novel measure of aneurysm rupture risk. As an initial step, the det...
Article
Full-text available
Local biomechanical effects play an important role in aneurysm formation and rupture. It is hypothesised that the main governing factors of the pathogenetic process are the temporal variation and spatial distribution of the flow induced wall shear stress (WSS). The present paper investigates the geometry of the carotid bifurcation, a typical locati...
Chapter
Clinical treatment of abdominal aortic aneurysms is decided mainly on the maximal dilatation diameter. Biomechanics based criteria calculated by numerical fluid structure interaction simulations on patient specific geometries are superior to that approach, but are extremely time and resource consuming and require high expertise, furthermore they fa...

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