Influence of the perforation configuration on dynamic behaviors of multilayered beam structure

Almitani, Khalid H.; Abdelrahman, Alaa A.; Eltaher, Mohamed A.

doi:10.1016/j.istruc.2020.09.055

Cited by 22 publications

(12 citation statements)

References 37 publications

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“…The effect of perforations, in various perforation shapes and distributions, on the natural frequencies of plates has been described in works by Cunningham et al [22], Abdelrahman et al [23], Ghonasgi et al [24], Jeong and Jhung [25], and others, where it was found in all these works that the presence of perforations reduced the overall stiffness of the plates and which hence reduced their natural frequencies. Almitani et al [26] studied the effect of the presence of perforations in multilayered beams on their natural frequencies and found a similar effect, namely that the number of perforations had an inversely proportional effect on the natural frequencies due to the reduction of stiffness. Sun et al [27] considered the effect of perforations on the aerodynamic flutter of large composite wind turbine blades and concluded that a higher rigidity and better flutter suppression damping was achieved through implementing the perforations.…”

Section: Introductionmentioning

confidence: 93%

Modal Analysis of Conceptual Microsatellite Design Employing Perforated Structural Components for Mass Reduction

2022

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Mass reduction is a primary design goal pursued in satellite structural design, since the launch cost is proportional to their total mass. The most common mass reduction method currently employed is to introduce honeycomb structures, with space qualified composite materials as facing materials, into the structural design, especially for satellites with larger masses. However, efficient implementation of these materials requires significant expertise in their design, analysis, and fabrication processes; moreover, the material procurement costs are high, therefore increasing the overall program costs. Thus, the current work proposes a low-cost alternative approach through the design and implementation of geometrically-shaped, parametrically-defined metal perforation patterns, fabricated by standard processes. These patterns included four geometric shapes (diamonds, hexagons, squares, and triangles) implemented onto several components of a structural design for a conceptual satellite, with a parametric design space defined by two scale factors and also two aspect ratio variations. The change in the structure’s fundamental natural frequency, as a result of implementing each pattern shape and parameter variation, was the selection criterion, due to its importance during the launcher selection process. The best pattern from among the four alternatives was then selected, after having validated the computational methodology through implementing experimental modal analysis on a scaled down physical model of a primary load-bearing component of the structural design. From the findings, a significant mass reduction percentage of 23.15%, utilizing the proposed perforation concept, was achieved in the final parametric design iteration relative to the baseline unperforated case while maintaining the same fundamental frequency. Dynamic loading analysis was also conducted, utilizing both the baseline unperforated and the finalized perforated designs, to check its capability to withstand realistic launch loads through applying quasi-static loads. The findings show that the final perforated design outperformed the baseline unperforated design with respect to the maximum displacements, maximum Von Mises stresses, and also the computed margin of safety. With these encouraging outcomes, the perforated design concept proved that it could provide an opportunity to develop low-cost satellite structural designs with reduced mass.

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Section: Introductionmentioning

confidence: 93%

Modal Analysis of Conceptual Microsatellite Design Employing Perforated Structural Components for Mass Reduction

2022

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“…Prasanth et al [ 44 ] designed structures with non-uniform shape and found that the pull-in voltage increased as the taper degree increased. Almitani et al [ 45 ], Abdelrahman et al [ 46 ], and Eltaher et al [ 47 – 48 ] proposed a perforated-beam structure, based on cantilever and bridge structures. Their studies showed that the filling rate of holes significantly affected the resonant frequency of the beam.…”

Section: Reviewmentioning

confidence: 99%

Electrostatic pull-in application in flexible devices: A review

Cai¹,

Fang²,

Fang³

et al. 2022

Beilstein J. Nanotechnol.

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The electrostatic pull-in effect is a common phenomenon and a key parameter in the design of microscale and nanoscale devices. Flexible electronic devices based on the pull-in effect have attracted increasing attention due to their unique ductility. This review summarizes nanoelectromechanical switches made by flexible materials and classifies and discusses their applications in, among others, radio frequency systems, microfluidic systems, and electrostatic discharge protection. It is supposed to give researchers a more comprehensive understanding of the pull-in phenomenon and the development of its applications. Also, the review is meant to provide a reference for engineers to design and optimize devices.

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“…Materials containing regular holes at equal intervals in a sequential manner are called perforated materials. In nuclear power plants, ships, offshore structures, micro-electro-mechanical systems and nanoelectro-mechanical systems, a perforated structure is created due to design requirements [1][2][3]. Onedimensional bending elements made of perforated materials are also called perforated beams.…”

Section: Introductionmentioning

confidence: 99%

Bending Analysis of a Perforated Microbeam With Laplace Transform

UZUN,

YAYLI

2023

Konya Journal of Engineering Sciences

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In recent years, the analysis of materials and elements with dimensions at nano/micro levels has gained momentum. While analyzing these small-scale materials and elements, higher-order elasticity theories have started to be used instead of classical elasticity theories (CETs). One of these theories, which includes a small-scale parameter in its constitutive equations, is the modified couple stress theory (MCST). In this study, the bending analysis of a cantilever perforated microbeam is investigated by MCST and Euler-Bernoulli (EB) beam theory. First, the perforation characteristics of the microbeam are described and incorporated into the equation governing the bending problem based on the modified couple stress theory found in the literature. Then, the Laplace transform is applied to the governing equation. The known boundary conditions of the cantilever microbeam are substituted into the equation and the inverse Laplace transform is applied to obtain the deflection equation.

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Influence of the perforation configuration on dynamic behaviors of multilayered beam structure

Cited by 22 publications

References 37 publications

Modal Analysis of Conceptual Microsatellite Design Employing Perforated Structural Components for Mass Reduction

Modal Analysis of Conceptual Microsatellite Design Employing Perforated Structural Components for Mass Reduction

Electrostatic pull-in application in flexible devices: A review

Bending Analysis of a Perforated Microbeam With Laplace Transform

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