High Amplitude Torsional Shear of Porcine Thoracic Aorta

  • Akshay Rao
  • Manoj Myneni
  • C. C. BenjaminEmail author
  • K. R. Rajagopal
Conference paper
Part of the Conference Proceedings of the Society for Experimental Mechanics Series book series (CPSEMS)


Studying the mechanics of aortic tissue is a crucial component in understanding its behavior under healthy as well as diseased conditions. Wall shear stress and circumferential stress have been largely accepted as significant factors in arterial growth and remodeling as a response to changes in flow and pressure. But, experimental studies on aortic tissues have largely focused on uniaxial and biaxial tests which are more suited for investigating circumferential stress. This may be explained by the inherent convenience of gripping tissue and then applying deformations in the uniaxial and biaxial modes. As such, the behavior of aortic tissue under shear has been left relatively unstudied. We propose to study the response of porcine aortic wall tissue under cyclic constant torsional shear strain rate for high amplitude (50%) and at different shear strain rates (4%/s and 40%/s). Three to four 12.5 mm diameter samples are obtained from the descending porcine aorta. Initial results clearly indicate a non linear response for the moment as a function of the angle of twist while many popular models predict a linear response for the arterial wall even under large shear strain.


Shear Rate-dependence Torsion Thoracic aorta Rheometer 


  1. 1.
    R. Avazmohammadi, D.S. Li, T. Leahy, E. Shih, J.S. Soares, J.H. Gorman, R.C. Gorman, M.S. Sacks, An integrated inverse model-experimental approach to determine soft tissue three-dimensional constitutive parameters: application to post-infarcted myocardium. Biomech. Model. Mechanobiol. 17(1), 31–53 (2018). CrossRefGoogle Scholar
  2. 2.
    S.X. Deng, J. Tomioka, J.C. Debes, Y.C. Fung, New experiments on shear modulus of elasticity of arteries. Am. J. Physiol. Heart Circ. Physiol. 266(35), H1–H10 (1994). CrossRefGoogle Scholar
  3. 3.
    S. Dokos, I.J. LeGrice, B.H. Smaill, J. Kar, A.A. Young, A triaxial-measurement shear-test device for soft biological tissues. J. Biomech. Eng. 122(5), 471 (2000). CrossRefGoogle Scholar
  4. 4.
    S. Dokos, B.H. Smaill, A.A. Young, I.J. LeGrice, Shear properties of passive ventricular myocardium. Am. J. Physiol. Heart Circ. Physiol. 283(6), H2650–H2659 (2002)CrossRefGoogle Scholar
  5. 5.
    H.W. Haslach, L.N. Leahy, P. Fathi, J.M. Barrett, A.E. Heyes, T.A. Dumsha, E.L. McMahon, Crack propagation and its shear mechanisms in the bovine descending aorta. Cardiovasc. Eng. Technol. 6(4), 501–518 (2015). CrossRefGoogle Scholar
  6. 6.
    V.A. Kasyanov B.A. Purinya, E.T. Determination of the shear modulus of human blood vessel walls. Polym. Mech. (2) (1979). CrossRefGoogle Scholar
  7. 7.
    X. Lu, J. Yang, J.B. Zhao, H. Gregersen, G.S. Kassab, Shear modulus of porcine coronary artery: contributions of media and adventitia. Am. J. Physiol. Heart Circ. Physiol. 285(5), H1966–H1975 (2003). CrossRefGoogle Scholar
  8. 8.
    G. Sommer, M. Eder, L. Kovacs, H. Pathak, L. Bonitz, C. Mueller, P. Regitnig, G.A. Holzapfel, Multiaxial mechanical properties and constitutive modeling of human adipose tissue: a basis for preoperative simulations in plastic and reconstructive surgery. Acta Biomater. 9(11), 9036–9048 (2013). CrossRefGoogle Scholar
  9. 9.
    G. Sommer, A.J. Schriefl, M. Andrä, M. Sacherer, C. Viertler, H. Wolinski, G.A. Holzapfel, Biomechanical properties and microstructure of human ventricular myocardium. Acta Biomater. 24, 172–192 (2015). CrossRefGoogle Scholar
  10. 10.
    A.T.J. Vossoughi, Determination of an effective shear modulus of aorta. Russ. J. Biomech. 1, 20–35 (1998)Google Scholar

Copyright information

© Society for Experimental Mechanics, Inc. 2020

Authors and Affiliations

  • Akshay Rao
    • 1
  • Manoj Myneni
    • 1
  • C. C. Benjamin
    • 1
    Email author
  • K. R. Rajagopal
    • 1
  1. 1.Department of Mechanical EngineeringTexas A&M UniversityCollege StationUSA

Personalised recommendations