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The Effect of Material Model Formulation in the Stress Analysis of Abdominal Aortic Aneurysms

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Abstract

A reliable estimation of wall stress in Abdominal Aortic Aneurysms (AAAs), requires performing an accurate three-dimensional reconstruction of the medical image-based native geometry and modeling an appropriate constitutive law for the aneurysmal tissue material characterization. A recent study on the biaxial mechanical behavior of human AAA tissue specimens demonstrates that aneurysmal tissue behaves mechanically anisotropic. Results shown in this communication show that the peak wall stress is highly sensitive to the anisotropic model used for the stress analysis. In addition, the present investigation indicates that structural parameters (e.g., collagen fiber orientation) should be determined independently and not by means of non-linear fitting to stress–strain test data. Fiber orientation identified in this manner could lead to overestimated peak wall stresses.

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Acknowledgments

This work is supported in part by the Pennsylvania Infrastructure Technology Alliance (a partnership of Carnegie Mellon University, Lehigh University and the Commonwealth of Pennsylvania Department of Community and Economic Development), the Spanish Ministry of Science and Technology through research grant DPI2004-07410-C03-01, the University of Zaragoza, an allocation of advanced computing resources granted by the National Science Foundation through the TeraGrid project at the Pittsburgh Supercomputing Center, and NIH grants R21EB007651, from the National Institute of Biomedical Imaging and Bioengineering, and R15HL087268, from the National Heart, Lung, and Blood Institute. The content is solely the responsibility of the authors and does not necessarily represent the official views of the National Institutes of Health.

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Authors and Affiliations

  1. Group of Structural Mechanics and Materials Modeling, Aragon Institute of Engineering Research (I3A) Torres Quevedo Building, María de Luna 3, Zaragoza, 50018, Spain

    Jose F. Rodríguez & Manuel Doblaré

  2. Royal Institute of Technology, Department of Solid Mechanics, 100 44, Stockholm, Sweden

    Giampalo Martufi

  3. Institute for Complex Engineered Systems, Biomedical Engineering Department and Department of Mechanical Engineering, Carnegie Mellon University, 5000 Forbes Avenue, 1205 Hamburg Hall, Pittsburgh, PA, 15213-3890, USA

    Ender A. Finol

Authors
  1. Jose F. Rodríguez
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  2. Giampalo Martufi
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  3. Manuel Doblaré
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  4. Ender A. Finol
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Correspondence to Ender A. Finol.

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Rodríguez, J.F., Martufi, G., Doblaré, M. et al. The Effect of Material Model Formulation in the Stress Analysis of Abdominal Aortic Aneurysms. Ann Biomed Eng 37, 2218–2221 (2009). https://doi.org/10.1007/s10439-009-9767-1

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  • DOI: https://doi.org/10.1007/s10439-009-9767-1

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