Nonlinear viscoelastic analysis of thin-walled beams in composite material |
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Authors: | Branca F. Oliveira Guillermo J. Creus |
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Affiliation: | CEMACOM (Centre for Applied and Computational Mechanics), Department of Civil Engineering, Federal University of Rio Grande do Sul, Av. Osvaldo Aranha, 99, 3° andar, 90035-190, Porto Alegre, RS, Brazil |
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Abstract: | Laminated composites of polymeric matrix show anisotropic viscoelastic behaviour, enhanced by temperature and humidity effects. The consideration of anisotropy and viscoelasticity are important for the determination of deformations and, as a consequence, of deformation-related phenomena, as elastic and creep buckling. This paper studies the behaviour of thin-walled beams of composite material under flexure and buckling, taking account of creep effects. The analysis uses a nonlinear viscoelastic finite element code with shell elements, whose basic formulation is given. The use of shell elements allows a better representation of constitutive properties and boundary conditions. Comparison with available analytical results is made for several cases like flexure of an I beam, buckling of beam columns and lateral buckling of this beams. The results show good correlation. |
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Keywords: | Composite materials Finite element Viscoelasticity Thin-walled beams Buckling |
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