A rigorous derivation of hemitropy in nonlinearly elastic rods

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July 2011, 16(1): 265-282. doi: 10.3934/dcdsb.2011.16.265

A rigorous derivation of hemitropy in nonlinearly elastic rods

Timothy J. Healey ^1,

1.	Department of Mathematics and Department of Mechanical & Aerospace Engineering, Cornell University, Ithaca, NY, United States

Received April 2010 Revised September 2010 Published April 2011

Abstract
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We consider a class of nonlinearly hyperelastic rods with helical symmetry, cf. [7]. Such a rod is mechanically invariant under the symmetries of a circular-cylindrical helix. Examples include idealized DNA molecules, wire ropes and cables. We examine the limit as the pitch of the helix characterizing the symmetry approaches zero and show that the resulting model is a hemitropic rod. The former is mechanically invariant under all proper rotations about its centerline and generally possesses chirality or handedness in its mechanical response, cf. [7]. An isotropic rod is also rotationally invariant but, in addition, enjoys certain reflection symmetries, which rule out chirality. Isotropy implies hemitropy, but the converse is not generally true. We employ both averaging methods and methods of gamma convergence to obtain the effective or homogenized (hemitropic) problem, the latter not corresponding to a naïve average.

Keywords: Cosserat rods, effective elastic properties., nonlinearly elastic, Hemitropy.

Mathematics Subject Classification: Primary: 74K10, 74Q05; Secondary: 34L30, 49J0.

Citation: Timothy J. Healey. A rigorous derivation of hemitropy in nonlinearly elastic rods. Discrete and Continuous Dynamical Systems - B, 2011, 16 (1) : 265-282. doi: 10.3934/dcdsb.2011.16.265

References:

[1]	S. S. Antman, "Problems of Nonlinear Elasticity," Springer-Verlag, New York, 2cnd edition, 2005.
[2]	J. M. Ball, Remarques sur l'existence et la régularité des solutions d'elatostatique non linéar, Recent Contributions to Nonlinear Partial Differential Equations, eds., H Berestycki & H. Brezis, Pitman, London, (1981), 50-62.
[3]	A. Braides, "Gamma Convergence for Beginners,'' Oxford University Press, Oxford, 2002. doi: 10.1093/acprof:oso/9780198507840.001.0001.
[4]	D. Cioranescu and P. Donato, "An Introduction to Homogenization,'' Oxford University Press, Oxford, 2002.
[5]	B. Dacorogna, "Direct Methods in the Calculus of Variations,'' Springer-Verlag, New York, 1989.
[6]	J. Guckenheimer and P. Holmes, "Nonlinear Oscillation, Dynamical Systems, and Bifurcations of Vector Fields,'' Springer-Verlag, New York, 1983.
[7]	T. J. Healey, Material symmetry and chirality in nonlinearly elastic rods, Math. Mech. Solids, 7 (2002), 405-420.
[8]	T. J. Healey and P. Mehta, Straightforward computation of spatial equilibria of geometrically exact Cosserat rods, Int. J. Bifur.Chaos, 15 (2005), 949-965. doi: 10.1142/S0218127405012387.
[9]	J. Jost and X. Li-Jost, "Calculus of Variations,'' Cambridge University Press, Cambridge, 2008.
[10]	S. Kerhbaum and J. H. Maddocks, Effective properties of elastic rods with high intrinsic twist, in M. Deville and R. Owens, editors, "Proceedings of the 16th IMACS World Congress 2000,'' pp. 1-8, 2000.
[11]	S. Mudaliar, M. Eng. Report, Cornell University, 2009.
[12]	R. T. Rockafellar, "Convex Analysis,'' Princeton University Press, Princeton, N.J., 1970.

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References:

[1]	S. S. Antman, "Problems of Nonlinear Elasticity," Springer-Verlag, New York, 2cnd edition, 2005.
[2]	J. M. Ball, Remarques sur l'existence et la régularité des solutions d'elatostatique non linéar, Recent Contributions to Nonlinear Partial Differential Equations, eds., H Berestycki & H. Brezis, Pitman, London, (1981), 50-62.
[3]	A. Braides, "Gamma Convergence for Beginners,'' Oxford University Press, Oxford, 2002. doi: 10.1093/acprof:oso/9780198507840.001.0001.
[4]	D. Cioranescu and P. Donato, "An Introduction to Homogenization,'' Oxford University Press, Oxford, 2002.
[5]	B. Dacorogna, "Direct Methods in the Calculus of Variations,'' Springer-Verlag, New York, 1989.
[6]	J. Guckenheimer and P. Holmes, "Nonlinear Oscillation, Dynamical Systems, and Bifurcations of Vector Fields,'' Springer-Verlag, New York, 1983.
[7]	T. J. Healey, Material symmetry and chirality in nonlinearly elastic rods, Math. Mech. Solids, 7 (2002), 405-420.
[8]	T. J. Healey and P. Mehta, Straightforward computation of spatial equilibria of geometrically exact Cosserat rods, Int. J. Bifur.Chaos, 15 (2005), 949-965. doi: 10.1142/S0218127405012387.
[9]	J. Jost and X. Li-Jost, "Calculus of Variations,'' Cambridge University Press, Cambridge, 2008.
[10]	S. Kerhbaum and J. H. Maddocks, Effective properties of elastic rods with high intrinsic twist, in M. Deville and R. Owens, editors, "Proceedings of the 16th IMACS World Congress 2000,'' pp. 1-8, 2000.
[11]	S. Mudaliar, M. Eng. Report, Cornell University, 2009.
[12]	R. T. Rockafellar, "Convex Analysis,'' Princeton University Press, Princeton, N.J., 1970.

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