Composite chiral shear vibration damper

Agnese, Fabio; Remillat, Chrystel D L; Scarpa, Fabrizio; Payne, Chris

doi:10.1016/j.compstruct.2015.05.048

Cited by 21 publications

(6 citation statements)

References 38 publications

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“…For this purpose, several studies are proposed [111,112]. Such an example is the use of chiral structures coupling uniaxial and rotational deformations to provide a negative Poisson's ratio behaviour and high dissipation through shear strain energy; this feature is exploited by up-scaling the deformation mechanism of the chiral cell to design a damper that dissipates energy in the edgewise/shear modes, such as the ones occurring in wind turbine blades [113]. Other work describes the numerical and experimental assessment of using star-shaped biphase cells.…”

Section: Protection Against Erosionmentioning

confidence: 99%

A Comprehensive Analysis of Wind Turbine Blade Damage

2021

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The scope of this article is to review the potential causes that can lead to wind turbine blade failures, assess their significance to a turbine’s performance and secure operation and summarize the techniques proposed to prevent these failures and eliminate their consequences. Damage to wind turbine blades can be induced by lightning, fatigue loads, accumulation of icing on the blade surfaces and the exposure of blades to airborne particulates, causing so-called leading edge erosion. The above effects can lead to damage ranging from minor outer surface erosion to total destruction of the blade. All potential causes of damage to wind turbine blades strongly depend on the surrounding environment and climate conditions. Consequently, the selection of an installation site with favourable conditions is the most effective measure to minimize the possibility of blade damage. Otherwise, several techniques and methods have already been applied or are being developed to prevent blade damage, aiming to reduce damage risk if not able to eliminate it. The combined application of damage prevention strategies with a SCADA system is the optimal approach to adequate treatment.

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Section: Protection Against Erosionmentioning

confidence: 99%

A Comprehensive Analysis of Wind Turbine Blade Damage

2021

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“…[10][11][12][13][14]). This can therefore thought of as a starting point, which led to exploratory works on their applications such as aircraft structures [15,16], technical textiles [17,18], shock absorber and vibration controller [19][20][21][22][23][24], chemical filters [25][26][27][28], surgical and biomedical implants [29][30][31][32][33], safety devices [34], sports gear [35,36], composite structures [37,38], footwear [39,40] and cushions [41,42], to name a few. In addition to the experimental evidence of negative Poisson's ratio in the form of foams by Lakes [9], it is worth mentioning that auxetic 2D foams were studied by Pozniak et al [43].…”

Section: Introductionmentioning

confidence: 99%

Auxetic properties of a tangram-inspired metamaterial

Lim

2023

Eng. Res. Express

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This paper explores a new anisotropic auxetic system that consists of rotating rhombi and right triangles by inspiration from tangram pieces. The Poisson’s ratio was developed by geometrical analysis on the representative unit with prescribed boundary requirements. Upon assigning rotational stiffness to the hinges, the Young’s modulus was established by matching the potential energy stored in the spiral springs with the strain energy of the deformation for the homogenized continuum. Results indicate that the on-axes Poisson’s ratio and dimensionless Young’s moduli are governed by the shapes and separation angles of the rigid units which, in turn, determine the dimension of the representative unit of the metamaterial. For the special case where the Poisson’s ratio is -1 when stretched on either axis, the Young’s moduli are equal. For this special case, the separation angles and the on-axes Young’s moduli increase monotonically with the shape descriptor of the rigid units. The capability of combining rotating rigid units of quadrilateral and triangular shapes suggests that new combinations of mechanical properties can be designed from rotation-based auxetic systems.

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“…Lakes [9,10] developed foams characterized by a negative Poisson's ratio which do exist in nature and such materials and structures can be manufactured. Since its rediscovery in the late 1980s, [9][10][11][12][13] auxetic materials have been investigated for applications as cushions, [14,15] footwear, [16,17] aircraft structures, [18,19] shock and vibration control, [20][21][22][23][24][25] technical textiles, [26,27] chemical filters, [28][29][30][31] implants, [32][33][34][35][36][37] safety devices, [38] composite structures, [39,40] and even sport safety gear. [41,42] Further details of auxetic materials can be found in recent reviews by Saxena et al, [43] Lim, [44] Lakes, [45] and Ren et al [46] as well as recent special issues on auxetics in Physica Status Solidi B (e.g., previous studies [47][48][49] ), Materials (e.g., previous studies [50]…”

Section: Introductionmentioning

confidence: 99%

Maximum Stresses in Rectangular Auxetic Membranes

Lim

2020

Physica Status Solidi (b)

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Auxetic materials exhibit a negative Poisson's ratio. Herein, the performance of rectangular auxetic membranes, under uniform load, is evaluated in terms of the maximum stress encountered. To facilitate convenient calculation, empirical modeling is conducted on the exact solution to reproduce displacement coefficients that are sufficiently accurate. A dimensionless maximum stress is then introduced to allow the effect from the membrane's Poisson's ratio and aspect ratio to be directly observed. Results reveal that 1) the dimensionless maximum stress reduces monotonically and nonmonotonically for conventional and auxetic membranes, respectively, 2) for the same Poisson's ratio magnitude the stresses in auxetic membranes are lower than those from conventional ones, 3) the optimal Poisson's ratio, on the basis of dimensionless maximum stress minimization, falls within the negative range, and 4) the dimensionless maximum stress minimization is especially effective for square membranes as well as very long and narrow membranes. It is therefore recommended that material auxeticity be taken into account-alongside geometrical and other material properties-in designing membranes and highly compliant very thin plates.

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Composite chiral shear vibration damper

Cited by 21 publications

References 38 publications

A Comprehensive Analysis of Wind Turbine Blade Damage

A Comprehensive Analysis of Wind Turbine Blade Damage

Auxetic properties of a tangram-inspired metamaterial

Maximum Stresses in Rectangular Auxetic Membranes

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