Analysis of micropolar elastic beams |
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| Authors: | S Ramezani R Naghdabadi S Sohrabpour |
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| Institution: | 1. Department of Mechanical Engineering, McGill University, Montreal, Quebec, Canada H3A 0C3;2. School of Mechanical Engineering, University of Adelaide, South Australia 5005, Australia;3. School of Mechanical, Materials & Mechatronic Engineering, University of Wollongong, NSW 2522, Australia;1. Department of Mechanical Engineering, Islamic Azad University, Bandar Anzali Branch, Anzali, Iran;2. Department of Mechanical Engineering, Faculty of Engineering, University of Guilan, Rasht, Iran |
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| Abstract: | 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. |
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