Vliv geometrických zjednodušení na deformačně-napěťové stavy v modelu aneurysmatu.

Influence of geometric simplifications on stresses and strains in aneurysm model.

článek ve sborníku ve WoS nebo Scopus

en

The paper deals with a possibility of replacing real cross sections of abdominal aortic aneurysm (AAA) by simplified cross sections with a circular or elliptic shape and with the influence of these simplifications on results obtained by FEM solutions. The shapes of AAA cross sections are obtained from sequenced CT frames (scans??) of a real patient. Naturally, the assumption of simplified cross section shapes smoothes down many local shape variations. To assess the influence of this effect on the calculated stress-strain states, a comparison of two models has been carried out. First, the analysis was realized with an real geometry model, created from the original, unchanged CT frames of the AAA. Second, a geometric model was created from the simplified CT frames with circular or elliptical shape of the cross sections. The same FE stress-strain analysis was carried out in both cases with a hyperelastic constitutive model. Comparison of results is then made via maximal principal stresses and strains in the AAA wall.

Příspěvek se zabývá citlivostí výsledků deformačně napěťové analýzy na zjednodušení skutečné geometrie aneurysmatu.

The paper deals with a possibility of replacing real cross sections of abdominal aortic aneurysm (AAA) by simplified cross sections with a circular or elliptic shape and with the influence of these simplifications on results obtained by FEM solutions. The shapes of AAA cross sections are obtained from sequenced CT frames (scans??) of a real patient. Naturally, the assumption of simplified cross section shapes smoothes down many local shape variations. To assess the influence of this effect on the calculated stress-strain states, a comparison of two models has been carried out. First, the analysis was realized with an real geometry model, created from the original, unchanged CT frames of the AAA. Second, a geometric model was created from the simplified CT frames with circular or elliptical shape of the cross sections. The same FE stress-strain analysis was carried out in both cases with a hyperelastic constitutive model. Comparison of results is then made via maximal principal stresses and strains in the AAA wall.

břišní aorta, aneurysma, CT snímky, model geometrie, konečnoprvková analýza

abdominal aorta, aneurysm, CT frames, model geometry, finite element analysis

2009

10.02.2010

Springer

Munich, Germany

978-3-642-03897-6

IFMBE Proceedings

529–532

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