Is smaller always stiffer? On size effects in supposedly generalized continua

Wheel, M.A. and Frame, J.C. and Riches, P.E. (2015) Is smaller always stiffer? On size effects in supposedly generalized continua. International Journal of Solids and Structures, 67-68. pp. 84-92. ISSN 0020-7683

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    Abstract

    Heterogeneous materials having constitutive behaviour described by more generalized continuum theories incorporating additional degrees of freedom such as couple stress, micropolar or micromorphic elasticity are expected to exhibit size effects in which there is an apparent increase in stiffness as the size scale reduces. Here we briefly demonstrate that for a simple heterogeneous material the size effect predicted when loaded in bending depends on the nature of the sample surface. Diverse size effects may thus be exhibited by the same material. We then show by detailed finite element analysis of a more representative material with regular heterogeneity that this diversity of size effects might actually be observed in practice thereby providing an explanation for the contradictory size effects that have sometimes been reported for real materials.

    Creators(s): Wheel, M.A. ORCID logoORCID: https://orcid.org/0000-0002-1372-6324, Frame, J.C. and Riches, P.E. ORCID logoORCID: https://orcid.org/0000-0002-7708-4607;
    Item type:Article
    ID code:52459
    Keywords:heterogeneous material , size effects , finite element analysis, elasticity, Mechanical engineering and machinery, Bioengineering, Mechanical Engineering, Biomedical Engineering, Mechanics of Materials
    Subjects:Technology > Mechanical engineering and machinery
    Technology > Engineering (General). Civil engineering (General) > Bioengineering
    Department:Faculty of Engineering > Mechanical and Aerospace Engineering
    Faculty of Engineering > Biomedical Engineering
    Depositing user: Pure Administrator
    Date deposited:02 Apr 2015 09:30
    Last modified:24 Feb 2021 08:37
    URI:https://strathprints.strath.ac.uk/id/eprint/52459
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