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Analysis of micropolar elastic beams

Ramezani, S ; Sharif University of Technology | 2009

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  1. Type of Document: Article
  2. DOI: 10.1016/j.euromechsol.2008.06.006
  3. Publisher: 2009
  4. Abstract:
  5. In this paper, a linear theory for the analysis of beams based on the micropolar continuum mechanics is developed. Power series expansions for the axial displacement and micro-rotation fields are assumed. The governing equations are derived by integrating the momentum and moment of momentum equations in the micropolar continuum theory. Body couples and couple stresses can be supported in this theory. After some simplifications, this theory can be reduced to the well-known Timoshenko and Euler-Bernoulli beam theories. The nature of flexural and longitudinal waves in the infinite length micropolar beam has been investigated. This theory predicts the existence of micro-rotational waves which are not present in any of the known beam theories based on the classical continuum mechanics. Also, the deformation of a cantilever beam with transverse concentrated tip loading has been studied. The pattern of deflection of the beam is similar to the classical beam theories, but couple stress and micro-rotation show an oscillatory behavior along the beam for various loadings. © 2008 Elsevier Masson SAS. All rights reserved
  6. Keywords:
  7. Continuum mechanics ; Elasticity ; Loading ; Mechanics ; Programming theory ; Rotation ; Beam theories ; Couple stress ; Elastic beams ; Euler Bernoulli beams ; Micro-rotation ; Micropolar beam ; Micropolar continuum ; Momentum equations ; Power series expansions ; Stresses
  8. Source: European Journal of Mechanics, A/Solids ; Volume 28, Issue 2 , 2009 , Pages 202-208 ; 09977538 (ISSN)
  9. URL: https://www.sciencedirect.com/science/article/pii/S0997753808000806