Experimental study on the aeroelastic behavior of a typical airfoil section with superelastic shape memory alloy springs

Sousa, Vagner Candido de; Marqui, Carlos De

doi:10.1177/1045389x17721024

Cited by 8 publications

(9 citation statements)

References 44 publications

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“…The widely consolidated spring-assisted rigid airfoil configuration is considered, where steel springs provide stiffness to the pitch and plunge degrees of freedom (DoFs) of the aeroelastic model [16,22,24,28,34,36]. This benchmark model exhibits important behaviors of elastic wings and blades with bending-torsion coupled vibration modes.…”

Section: Airfoil Model Design and Constructionmentioning

confidence: 99%

“…A mechanism based on the pseudoelastic hysteresis of superelastic shape-memory alloy (SMA) elements is numerically investigated in [33]. The mechanism is experimentally demonstrated by wind tunnel tests of a PAPA model with SMA helical springs in [34,35] (the energy harvesting feature is not considered in the experiment). Other works focus on the aerodynamically nonlinear behavior of PAPA models in aeroelastic and electroaeroelastic cases [15][16][17][18][19].…”

Section: Introductionmentioning

confidence: 99%

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Wind Tunnel Bench Test of a Pitch-and-Plunge Aeroelastic Model Undergoing Nonlinear Post-Flutter Oscillations

Santos,

Adeodato,

Dağlı

et al. 2024

Preprint

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Purpose: The nonlinear post-flutter aeroelastic behavior of a classical pitch-and-plunge airfoil model in low-speed wind tunnel bench tests is reported in this study for a range of airflow speeds where stable oscillations are observed. Methods: An experimental airfoil prototype is designed, characterized and evaluated. Time domain data of the airfoil motion as well as other pertinent frequency and bifurcation characteristics are presented for different values of airflow speed, starting at the critical linear flutter speed of the airfoil model and increasing up to the sudden manifestation of violent unstable oscillations (when the test is interrupted for the safety of the structural apparatus). Results: Stable post-flutter nonlinear oscillations, mainly attributed to the dynamic stall phenomenon and in a lesser degree to hardening structural effects, are observed for a range of airflow speeds starting at the neutral stability boundary of the aeroelastic system. The amplitudes of oscillation increase with increasing airflow speed and settle onto a limit-cycle. The coupled frequency of oscillation is dominated by the plunge degree-of-freedom and also increases with increasing airflow speed. The observed critical airfoil cut-in speed of limit-cycle onset is about 8.1 \mps, and the observed cut-out speed of unstable response is about 9.5 \mps. Conclusion: This work contributes with the literature of Aeroelasticity by presenting the realization, evaluation, and wind tunnel test data of a pitch-and-plunge airfoil model undergoing nonlinear post-flutter oscillations that may be useful to support other studies for verification purposes of eventual numerical simulations of similar aeroelastic systems.

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Section: Airfoil Model Design and Constructionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Wind Tunnel Bench Test of a Pitch-and-Plunge Aeroelastic Model Undergoing Nonlinear Post-Flutter Oscillations

Santos,

Adeodato,

Dağlı

et al. 2024

Preprint

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“…They showed the effect of pseudoelastic and ferroelastic hysteresis loop on damping capacity of the material. The aeroelastic behavior of a 2-degree-of-freedom typical airfoil section with superelastic SMA springs was studied by Candido de Sousa and De Marqui (2018). They demonstrated linear unstable postflutter behavior and the role of SMA springs to enhance the aeroelastic response of a structure.…”

Section: Introductionmentioning

confidence: 99%

Nonlinear free vibration and damping analysis of a microbeam with pseudoelastic shape memory alloy layer based on the modified couple stress theory

Ashrafi

Ghaffari

Elahinia

et al. 2020

Journal of Vibration and Control

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The aim of this investigation is to evaluate the size effects on the nonlinear free vibration of the sandwich composite microbeam with an extensible shape memory alloy layer in the midplane. A one-dimensional constitutive model is considered to simulate the pseudoelastic behavior of the shape memory alloy layer. The governing equation of motion is derived using the Euler–Bernoulli beam theory together with the modified couple stress theory through the Hamilton’s principle. Midplane stretching and phase transformation of the shape memory alloy which are sources of nonlinearity were considered, and a numerical solution method is presented. A damped response of the sandwich composite microbeam is observed because of the hysteresis behavior of the extensible shape memory alloy layer in the midplane. Results are appraised by comparing with the available literature. The influence of material length scale, temperature, and initial velocity on the loss factor and other pivotal vibrational behavior is evaluated. Results show that increasing the material length scale to thickness ratio has a decreasing effect on damping capacity.

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“…For larger deformations, hysteretic behavior is associated with stress-induced martensitic phase transformation, providing additional damping capabilities. [31][32][33][34][35][36] Although many different SMA models are available, 24,[37][38][39][40][41] the models by Liang and Rogers 31,42,43 and Brinson 23 are among the most commonly employed and extended SMA models due to their simplicity and relatively good experimental agreement. The work of Liang and Rogers 31,43 presented the modeling of SMA helical springs based on classical spring design by employing the pure shear assumption and proposed the use of SMA springs in vibration problems.…”

Section: Introductionmentioning

confidence: 99%

“…Other efforts [44][45][46] further split the stress-induced martensite into tension and compression components in order to represent the asymmetric behavior usually observed in SMAs. Due to the attractive damping characteristics of SMAs, [31][32][33] the literature on the use of these materials in vibration attenuation and control problems includes seismic response enhancement and/or base isolation of structures, [47][48][49][50][51] adaptive vibration absorbers, [52][53][54] and beam-like (or platelike) structures with embedded SMA members, [55][56][57] as well as beams or plates made of SMAs [58][59][60] and passive mitigation of aeroelastic oscillations, [34][35][36] among other applications.…”

Section: Introductionmentioning

confidence: 99%

Adaptive locally resonant metamaterials leveraging shape memory alloys

Sousa

Sugino

Marqui

et al. 2018

Journal of Applied Physics

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Locally resonant metamaterials leveraging shape memory alloy (SMA) springs are explored in this work in an effort to develop adaptive metamaterial configurations that can exhibit tunable bandgap properties as well as enhanced damping capabilities. An analytical model for a locally resonant metamaterial beam in transverse vibrations is combined with an SMA model for the resonator springs to investigate and leverage the potential of temperature-induced phase transformations and stress-induced hysteretic behavior of the springs. Two case studies are presented for this new class of smart metamaterials and the resulting finite metastructures. In one case, SMA resonators operate in the linear elastic regime, first at low temperature (martensitic behavior) and then at high temperature (austenitic behavior), demonstrating how the bandgap can be tuned to a different frequency range by altering the SMA elastic modulus with temperature. In the second case, the SMA springs are kept at high temperature at all times to operate in the nonlinear regime, so that the hysteresis associated with the SMA pseudoelastic effect is manifested, yielding additional dissipation over a range of frequencies, especially for the modes right outside the bandgap.

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Experimental study on the aeroelastic behavior of a typical airfoil section with superelastic shape memory alloy springs

Cited by 8 publications

References 44 publications

Wind Tunnel Bench Test of a Pitch-and-Plunge Aeroelastic Model Undergoing Nonlinear Post-Flutter Oscillations

Wind Tunnel Bench Test of a Pitch-and-Plunge Aeroelastic Model Undergoing Nonlinear Post-Flutter Oscillations

Nonlinear free vibration and damping analysis of a microbeam with pseudoelastic shape memory alloy layer based on the modified couple stress theory

Adaptive locally resonant metamaterials leveraging shape memory alloys

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