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Linear micropolar elastic crack-tip fields under mixed mode loading conditions

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Abstract

Micropolar elasticity laws provide a possibility to describe constitutive properties of materials for which internal length scales may become important. They are characterized by the presence of couple stresses and nonsymmetric Cauchy stress tensor. Beyond the classical displacement field, the kinematical variables are augmented by a so-called microrotation field and its gradient, the latter introducing an internal length scale in the theory. For an isotropic, linear micropolar elastic material, the near-tip asymptotic field solutions for mode I and mode II cracks are derived. It is shown that these solutions behave similar to those according to the so-called couple stress theory, which has been investigated by Huang et al. (1997a), or similar to those derived for cellular materials by Chen et al. (1998). In particular, the singular fields have an order of singularity r −1/2 and are governed by some amplitude factors, having the meaning of stress intensity factors as in the classical linear elastic theory. The effect of material parameters on the stress intensity factors is studied by applying the finite element method to calculate the values of the stress intensity factors for an edge-cracked specimen of finite width.

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Authors and Affiliations

  1. Forschungszentrum Karlsruhe, Institut für Materialforschung, Germany

    Eberhard Diegele

  2. DaimlerCrysler AG, HPZB 209, 70546, Stuttgart, Germany

    Rainer ElsÄßer

  3. TU Darmstadt, Institut für Mechanik, AG 1 Kontinuumsmechanik (Materialtheorie), Hochschulstraße 1, 64289, Darmstadt, Germany

    Charalampos Tsakmakis

Authors
  1. Eberhard Diegele
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  2. Rainer ElsÄßer
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  3. Charalampos Tsakmakis
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Diegele, E., ElsÄßer, R. & Tsakmakis, C. Linear micropolar elastic crack-tip fields under mixed mode loading conditions. International Journal of Fracture 129, 309–339 (2004). https://doi.org/10.1023/B:FRAC.0000049492.13523.5a

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  • DOI: https://doi.org/10.1023/B:FRAC.0000049492.13523.5a

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