Profile beams with adaptive bending–twist coupling by adjustable shear centre location

Raither, Wolfram; Bergamini, Andrea; Ermanni, Paolo

doi:10.1177/1045389x12458040

Cited by 12 publications

(12 citation statements)

References 17 publications

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“…No experimental results of adaptive composite beams were found in the scientific literature, and therefore the model accuracy was analysed with experimental movements of aluminium beams, as reported by Raither et al [10]. These authors present experi mental data on cantilever beams with a box section, with three walls made of aluminium and the fourth (one of the webs) of a PMMA polymer.…”

Section: Model Validationmentioning

confidence: 99%

“…The second cross section has lower shear stiffness due to the position of the adaptive walls, and thus the influence of temperature in the shear stiffness is high. The two sections have no variable stiffness flanges, since in some applications (as in aircraft structures) the principal bending stiffnesses should be affected as little as possible [10].…”

Section: Problem Descriptionmentioning

confidence: 99%

“…The vertical displacement and torsional rotation and the free end of the beam, and calculated by the analytical model were compared with those in Ref. [10] and are listed in Table 1.…”

Section: Model Validationmentioning

confidence: 99%

“…Isotropic beams have been analysed elsewhere [10], where the authors study a beam made of aluminium with a variable stiffness web. In another work [11], the authors examine an airfoil section made of composite material where several interfaces with controllable shear stiffness (PVC) are placed and the concept is based in variable bending twist coupling.…”

Section: Introductionmentioning

confidence: 99%

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Stiffness control in adaptive thin-walled laminate composite beams

Rivas

Barbero

2016

Composites Part A: Applied Science and Manufacturing

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a b s t r a c tThe aim of this paper is to verify the control of the stiffness that is feasible to achieve in a thin walled box beam made from a laminate by including an adaptive material with variable stiffness. In this work, a material having a strongly varying Young Modulus under minor temperature changes was included in the cross section. An analytical model was used to estimate the position of shear centre and the axial, bending, torsional, and shear stiffnesses of the cross section. Two cross sections were analysed, one with an adaptive wall and another with two adaptive walls. In both sections, the torsional stiffness could be strongly altered with minor temperature variations. In the section with one adaptive wall, the shear centre and thus the bending twist coupling was also strongly modified. A study was made of the influ ence on the control of stiffnesses exerted by the overall cross section thickness and the thickness of the adaptive walls.

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Section: Model Validationmentioning

confidence: 99%

Section: Problem Descriptionmentioning

confidence: 99%

“…The vertical displacement and torsional rotation and the free end of the beam, and calculated by the analytical model were compared with those in Ref. [10] and are listed in Table 1.…”

Section: Model Validationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Stiffness control in adaptive thin-walled laminate composite beams

Rivas

Barbero

2016

Composites Part A: Applied Science and Manufacturing

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“…14,15 While testing of a scaled experimental airfoil structure and numerical upscaling to the conditions of a glider wing have shown the great potential of the structural concept, the applied smart material, which exploits the glass transition of integrated polymer layers, suffers from high energy demand and long activation times. These issues are addressed by the work on hand by the investigation of an adaptive-twist airfoil based on a similar structural design, but equipped with a smart material system relying on electromechanical coupling which promises advances in energy efficiency and activation speed.…”

Section: Introductionmentioning

confidence: 99%

Adaptive-Twist Airfoil Based on Electrostatic Stiffness Variation

Raither

Simoni

Lillo

et al. 2014

22nd AIAA/ASME/AHS Adaptive Structures Conference

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Shape-adaptable airfoils with variable shear center location and torsional stiffness represent a promising solution for controlling the aerodynamic loads on a wing by continuous deformations instead of rigid-body attachments. In the present article, a structural concept for an adaptive-twist airfoil based on wing spars with variable mechanical topology is investigated. The integration of a smart material system relying on controllable electrostatic attraction forces in the spars allows for reversible opening of the wing box and thusfor controlling the airfoil's twist. While finite element simulations and static testing of an experimental airfoil demonstrate the concept's effectiveness, a numerical upscaling to the dimensions of a glider wing evaluates its potential with respect to a realistic application. Under the considered conditions, the upscaled adaptive-twist airfoil permits changes in lift coefficient by around 20% in such an implementation.

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