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Flower Patterns on Honeycomb Structures

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Imperfect Bifurcation in Structures and Materials

Part of the book series: Applied Mathematical Sciences ((AMS,volume 149))

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Abstract

Bifurcation mechanism of honeycomb structures is elucidated by the study of a that is the direct product of O(2) and two reflection group. A flower pattern is theoretically assessed to branch from a triple bifurcation point and is actually found by a numerical analysis of a honeycomb cellular solid. Other bifurcating patterns of interest are found in this study through the analysis of bifurcation points with the multiplicity of six and twelve. Fundamentals of group representation theory in Chap. 7 and group-theoretic bifurcation theory in Chap. 8 are foundations of this chapter.

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Notes

  1. 1.

    Characteristic deformation patterns of honeycomb structures subjected to uniaxial and biaxial in-plane compression were found during experiments (e.g., Gibson and Ashby, 1997 [53]). In particular, a flower mode was observed experimentally (e.g., Papka and Kyriakides, 1999 [153]) and was simulated successfully by finite-element analyses (e.g., Guo and Gibson, 1999 [59]).

  2. 2.

    The theoretical and numerical analyses in this chapter are based on Saiki, Ikeda, and Murota, 2005 [166]. Corrections and revisions were made in the second edition of this book to supplement deficiencies and to present more details. In this third edition, a further extension is made based on Ikeda, Murota, and Akamatsu, 2012 [85]; Ikeda and Murota, 2014 [84]; Ikeda et al., 2014 [86]; and Ikeda, Murota, and Takayama, 2017 [89].

  3. 3.

    See, for example, Bénard, 1900 [11]; Chandrasekhar, 1961 [21]; and Koschmieder, 1966 [116], 1993 [118].

  4. 4.

    These patterns, for example, are hexagons, antihexagons, rolls, regular triangle, and patchwork quilt. The hexagonal lattice is employed in the description of convection of fluids and nematic liquid crystals (cf., Peacock et al., 1999 [154]; Golubitsky and Stewart, 2002 [56]; and Chillingworth and Golubitsky, 2003 [23]). For related issues, see Buzano and Golubitsky, 1983 [19]; Melbourne, 1999 [130]; and Bressloff et al., 2001 [17]. Refer to Crawford, 1994 [30] for a study of a square lattice.

  5. 5.

    Although \(\mathbb {Z}_{n}\) is isomorphic to Cn, it is appropriate to use \(\mathbb {Z}_{n}\) in the context of this chapter.

  6. 6.

    Notation \(\ \dot {+} \ \) for a semidirect product, instead of \(\ltimes \), is used, e.g., in Golubitsky, Stewart, and Schaeffer, 1988 [57].

  7. 7.

    The stability analysis for the group \({\mathrm {D}}_6 \ltimes {\mathrm {T}}^2\) was conducted, e.g., in Dionne, Silber, and Skeldon (1997) [39] and for the group \({\mathrm {D}}_6 \ltimes (\mathbb {Z}_n\times {\mathbb {Z}}_n)\) in Ikeda et al., 2018 [73].

  8. 8.

    Details of this analysis are available in Saiki, Ikeda, and Murota, 2005 [166].

  9. 9.

    Details of these irreducible representations can be found in Ikeda and Murota, 2014 [84, Chapter 6].

  10. 10.

    Group-theoretic bifurcation analysis of six-dimensional irreducible representations of the group \({\mathrm {D}}_6 \ltimes {\mathrm {T}}^2\), where T2 means a two-dimensional torus, was conducted to show the existence of possible bifurcating patterns: hexagons, rolls, and triangles (Kirchgässner, 1979 [112]; Buzano and Golubitsky, 1983 [19]; Dionne and Golubitsky, 1992 [38]; Golubitsky and Stewart, 2002 [56]).

  11. 11.

    The condition (17.89) plays no critical role in solving the bifurcation equations although it puts some constraints on some terms.

  12. 12.

    Group-theoretic bifurcation analysis of 12-dimensional irreducible representations of the group \({\mathrm {D}}_6 \ltimes {\mathrm {T}}^2\), where T2 means a two-dimensional torus, was conducted to show the existence of possible bifurcating patterns: simple hexagons and super hexagons (Kirchgässner, 1979 [112]; Dionne, Silber, and Skeldon, 1997 [39]; Judd and Silber, 2000 [104]).

  13. 13.

    The terms in [⋯ ] correspond to the index set Q in (17.148). See Example 17.4.

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Ikeda, K., Murota, K. (2019). Flower Patterns on Honeycomb Structures. In: Imperfect Bifurcation in Structures and Materials. Applied Mathematical Sciences, vol 149. Springer, Cham. https://doi.org/10.1007/978-3-030-21473-9_17

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