Cohesive Zone Model Analysis, Development, and Application in Mixed-Mode Arterial Dissection

FitzGibbon, Brian; Fereidoonnezhad, Behrooz; McGarry, Patrick

doi:10.1007/978-3-030-92339-6_4

Cited by 1 publication

(1 citation statement)

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“…Our study confirms, in a 3D setting of in‐plane tear propagation, that the critical pressure is lowered with the increasing size of initial tear. However, one should not go further to assume the tear would propagate without limit, since the possible crack‐tip blunting effect predicted in FitzGibbon, Fereidoonnezhad, and McGarry, 37 as well as the influence from bifurcation arteries, were not considered in this study. While the critical pressure was shown to be correlated to the tissue stiffness and the critical energy of tearing by Ban et al, 19 our paper highlights the influence from the mode of damage.…”

Section: Discussionmentioning

confidence: 99%

Finite‐element simulation of in‐plane tear propagation in the dissected aorta: Implications for the propagation mechanism

Han

Guo

Gao

et al. 2023

Numer Methods Biomed Eng

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Computer modeling and numerical simulation are essential for understanding the progression of aortic dissection. However, tear propagation has not been properly modeled and simulated. The in‐plane dissection propagation between concentrically distributed elastic lamellae is modeled using the cohesive zone method with a bilinear traction‐separation law. The parameters of cohesive elements are calibrated for the three modes of interfacial damage in the media, enabling quantitative predictions of in‐plane tear propagation. An idealized cylindrical tube‐shaped bilayer thick‐wall model of the aorta is employed to elucidate the influence of geometrical parameters, loading conditions and residual stress on the tear propagation. While the model is capable of replicating that deeper, larger tears are associated with lower critical pressure, new findings include: (i) Larger axial stretch leads to lower critical pressure; (ii) Increased magnitude of residual stress is associated with higher critical pressure; (iii) Pressure difference between true and false lumen alters the critical pressure; (iv) The interfacial damage is mostly opening mode in the axial direction, but shear‐dominated in the circumferential direction; (v) Damage due to the opening mode is associated with smaller fracture energy, which makes it easier to propagate than the shear and the mixed modes. (vi) The deformed shape of the tear, which is related to its geometrical features and loading conditions, modulates the critical pressure via two pathways: (a) deformed shapes are associated with specific modes of damage, which influences the critical pressure, and (b) deformed shapes modulate the critical pressure directly via geometrical constraints.

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Section: Discussionmentioning

confidence: 99%