Vol. 8, No. 1, 2013

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Wave velocity formulas to evaluate elastic constants of soft biological tissues

Pham Chi Vinh and Jose Merodio

Vol. 8 (2013), No. 1, 51–64

We use the equations governing infinitesimal motions superimposed on a finite deformation in order to establish formulas for the velocity of (plane homogeneous) shear bulk waves and surface Rayleigh waves propagating in soft biological tissues subject to uniaxial tension or compression. Soft biological tissues are characterized as transversely isotropic incompressible nonlinearly elastic solids. The constitutive model is given as an strain-energy density expanded up to fourth order in terms of the Green strain tensor. The velocity formulas are written as ρv2 = a0 + a1e + a2e2 where ρ is the mass density, v is the wave velocity, ak are functions in terms of the elastic constants and e is the elongation in the loading direction. These formulas can be used to evaluate the elastic constants since they determine the exact behavior of the elastic constants of second, third, and fourth orders in the incompressible limit.

incompressible transversely isotropic elastic solids, soft biological tissues, shear bulk waves, Rayleigh waves, wave velocity, elastic constants
Received: 23 August 2012
Revised: 15 November 2012
Accepted: 17 November 2012
Published: 28 March 2013
Pham Chi Vinh
Faculty of Mathematics, Mechanics and Informatics
Hanoi University of Science
334, Nguyen Trai Str., Thanh Xuan
Hanoi 1000
Jose Merodio
Department of Continuum Mechanics and Structures
E.T.S. Ingeniería de Caminos, Canales e Puertos
Universidad Politecnica de Madrid
28040 Madrid