Relaxed incremental variational approach for the modeling of damage-induced stress hysteresis in arterial walls

In this paper, a three-dimensional relaxed incremental variational damage model is proposed, which enables the description of complex softening hysteresis as observed in supra-physiologically loaded arterial tissues, and which thereby avoids a loss of convexity of the underlying formulation. The pro...

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Veröffentlicht in:Journal of the mechanical behavior of biomedical materials Jg. 58; S. 149 - 162
Hauptverfasser: Schmidt, Thomas, Balzani, Daniel
Format: Journal Article
Sprache:Englisch
Veröffentlicht: Netherlands Elsevier Ltd 01.05.2016
Schlagworte:
Adjustment
Algorithms
Aorta - pathology
Arteries
Atherosclerotic arteries
Carotid Arteries - pathology
Convexity
Cyclic loads
Damage
Finite Element Analysis
Humans
Hysteresis
Mathematical models
Mesh-independency
Models, Cardiovascular
Orientation distribution
Soft biological tissues
Softening
Stress, Mechanical
Three dimensional
Atherosclerotic arteries
Orientation distribution
Convexity
Softening
Soft biological tissues
Mesh-independency
ISSN:1751-6161, 1878-0180, 1878-0180
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Zusammenfassung:In this paper, a three-dimensional relaxed incremental variational damage model is proposed, which enables the description of complex softening hysteresis as observed in supra-physiologically loaded arterial tissues, and which thereby avoids a loss of convexity of the underlying formulation. The proposed model extends the relaxed formulation of Balzani and Ortiz [2012. Relaxed incremental variational formulation for damage at large strains with application to fiber-reinforced materials and materials with truss-like microstructures. Int. J. Numer. Methods Eng. 92, 551–570], such that the typical stress-hysteresis observed in arterial tissues under cyclic loading can be described. This is mainly achieved by constructing a modified one-dimensional model accounting for cyclic loading in the individual fiber direction and numerically homogenizing the response taking into account a fiber orientation distribution function. A new solution strategy for the identification of the convexified stress potential is proposed based on an evolutionary algorithm which leads to an improved robustness compared to solely Newton-based optimization schemes. In order to enable an efficient adjustment of the new model to experimentally observed softening hysteresis, an adjustment scheme using a surrogate model is proposed. Therewith, the relaxed formulation is adjusted to experimental data in the supra-physiological domain of the media and adventitia of a human carotid artery. The performance of the model is then demonstrated in a finite element example of an overstretched artery. Although here three-dimensional thick-walled atherosclerotic arteries are considered, it is emphasized that the formulation can also directly be applied to thin-walled simulations of arteries using shell elements or other fiber-reinforced biomembranes.
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ISSN:1751-6161
1878-0180
1878-0180
DOI:10.1016/j.jmbbm.2015.08.005