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The Effects of Compressibility on Inhomogeneous Deformations for a Class of Almost Incompressible Isotropic Nonlinearly Elastic Materials

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Abstract

Experimental data for simple tension suggest that there is a power–law kinematic relationship between the stretches for large classes of slightly compressible (or almost incompressible) non-linearly elastic materials that are homogeneous and isotropic. Here we confine attention to a particular constitutive model for such materials that is of generalized Varga type. The corresponding incompressible model has been shown to be particularly tractable analytically. We examine the response of the slightly compressible material to some nonhomogeneous deformations and compare the results with those for the corresponding incompressible model. Thus the effects of slight compressibility for some basic nonhomogeneous deformations are explicitly assessed. The results are fundamental to the analytical modeling of almost incompressible hyperelastic materials and are of importance in the context of finite element methods where slight compressibility is usually introduced to avoid element locking due to the incompressibility constraint. It is also shown that even for slightly compressible materials, the volume change can be significant in certain situations.

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Authors and Affiliations

  1. Structural and Solid Mechanics Program, Department of Civil Engineering, University of Virginia, Charlottesville, VA, 22904, USA

    C. O. Horgan

  2. Department of Mechanical Engineering, Dublin City University, Glasnevin, Dublin 9, Ireland

    J. G. Murphy

Authors
  1. C. O. Horgan
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  2. J. G. Murphy
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Correspondence to C. O. Horgan.

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Horgan, C.O., Murphy, J.G. The Effects of Compressibility on Inhomogeneous Deformations for a Class of Almost Incompressible Isotropic Nonlinearly Elastic Materials. J Elasticity 88, 207–221 (2007). https://doi.org/10.1007/s10659-007-9131-3

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  • DOI: https://doi.org/10.1007/s10659-007-9131-3

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