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A COMPARATIVE STUDY OF LARGE DEFLECTIONS OF COMPOSITE BEAMS UNDER THERMOMECHANICAL LOADING

卷 10, 册 4, 2019, pp. 311-332
DOI: 10.1615/CompMechComputApplIntJ.2019028577
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摘要

The present investigation is concerned with the predictions of different beam theories for a laminated composite beam under thermomechanical loading. Different levels of complexity in the strain field are taken into consideration based on the finite deformations and the first-order shear deformation theory of laminated beams. The theories under considerations include the Timoshenko beam theory of nonlinear large deflections (TNL), the Timoshenko beam theory of nonlinear moderately large deflections (TML), the Timoshenko beam theory of linear small deflections (TL), and the Euler-Bernoulli beam theory linear small deflection of linear small deflections (EB). A simply supported laminated composite beam is considered under a combination of thermal gradient with a concentrated load, both in the transverse direction. The approach is based on expressing the applied thermomechanical loads in terms of strains and displacements to come up with the transverse and longitudinal deflections. The effects of temperature, load, and properties of the laminated composite material are studied. The differences between the predictions of the different theories are attributed mainly to the combined effects of thermal and mechanical loading, in addition to the nonlinearities and shear deformation effects.

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