Circumferential vibration analysis of nano-porous-sandwich assembled spherical-cylindrical-conical shells under elastic boundary conditions

Sobhani, Emad; Masoodi, Amir R.; Ahmadi-Pari, Amir Reza

doi:10.1016/j.engstruct.2022.115094

Cited by 32 publications

(6 citation statements)

References 67 publications

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“…[ 12–16 ] According to research studies, dispersing carbon‐based nanomaterials such as multiwalled carbon nanotube (MWCNT) as reinforcement in epoxy can significantly improve the mechanical properties of nanocomposite even at very low concentrations. [ 17–19 ]…”

Section: Introductionmentioning

confidence: 99%

“…[12][13][14][15][16] According to research studies, dispersing carbon-based nanomaterials such as multiwalled carbon nanotube (MWCNT) as reinforcement in epoxy can significantly improve the mechanical properties of nanocomposite even at very low concentrations. [17][18][19] Due to the attractive advantages of conductive nanocomposite foams, a large number of studies have been conducted with a focus on the fabrication of these materials for various applications. For example, soft polymer CNT sponges fabricated by the process of chemical vapor deposition, [20] thermoplastic polyurethane (TPU) foams enhanced with graphene fabricated by thermalinduced phase separation (TISP) method, [21] sponge polydimethylsiloxane (PDMS) coated with graphene, [22] and microcellular silver coated poly(ether-block-amide) beads and foamed by supercritical CO 2 method.…”

Section: Introductionmentioning

confidence: 99%

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Mechanical characterization of multifunctional highly porous carbon nanotube‐reinforced foams

et al. 2023

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In recent years, novel features of ultra‐flexible nanocomposite foams have drawn tremendous attention toward these materials to be utilized in a variety of engineering applications. Since Young's modulus of nanocomposite foams is related to their mechanical strength and directly affects their applications, in this study, this property was evaluated experimentally and theoretically. In this regard, polydimethylsiloxane (PDMS)/multiwalled carbon nanotube (MWCNT) nanocomposite foams with different filler contents (e.g., 0.1, 0.25, and 0.5 wt%) and different porosities (e.g., 60%, 70%, and 80%) were fabricated by solvent casting and particulate leaching methods. The results suggested that the optimum value for foam porosity and MWCNT content is required to elevate Young's modulus of nanocomposite foams. The experimental data indicated that in the samples with 60% porosity increasing MWCNT content improved Young's modulus of the samples; however, in the samples with 70% porosity Young's modulus was elevated when the filler content was up to 0.25 wt%. Moreover, using the experimental data, a theoretical approach was successfully extended to predict Young's modulus of nanocomposite foams with the combination of different void fractions and CNT contents.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Mechanical characterization of multifunctional highly porous carbon nanotube‐reinforced foams

et al. 2023

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“…The continuous development and technological update requirements of aerospace platforms and high-speed rails have led to great efforts for designing new structures and materials that integrate both lightweight and special multifunctional properties [ 1 , 2 , 3 , 4 , 5 , 6 ]. However, sandwich plates generate harmful vibration and radiated noise that can negatively impact both equipment functionality and operator safety.…”

Section: Introductionmentioning

confidence: 99%

Vibration and Bandgap Behavior of Sandwich Pyramid Lattice Core Plate with Resonant Rings

Chen

Jiao

2023

Materials

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The vibration suppression performance of the pyramid lattice core sandwich plates is receiving increasing attention and needs further investigation for technical upgrading of potential engineering applications. Inspired by the localized resonant mechanism of the acoustic metamaterials and considering the integrity of the lattice sandwich plate, we reshaped a sandwich pyramid lattice core with resonant rings (SPLCRR). Finite element (FE) models are built up for the calculations of the dispersion curves and vibration transmission. The validity of the bandgap of the SPLCRR and remarkable vibration suppression are verified by experimental observations and the numerical methods. Furthermore, the effects of geometric parameters, material parameters and period parameters on the bandgaps of the SPLCRR are systematically investigated, which offers a deeper understanding of the underlying mechanism of bandgap and helps the SPLCRR structure meet the technological update requirements of practical engineering design.

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“…Fiber-reinforced polymer (FRP) composites are widely used in the fields of aerospace, automobiles, energy, and civil engineering owing to their lightweight, high strength, superior fatigue, and durability [ 1 , 2 , 3 , 4 , 5 ]. For the joining of structural components and to give access to the interior of the structure, notched composite panels are widely employed [ 6 ].…”

Section: Introductionmentioning

confidence: 99%

Analytical Method for the Optimization of the Open-Hole and Filled-Hole Laminates at the Preliminary Design Stage

et al. 2023

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In recent years, there has been an increasing interest in open-hole and filled-hole laminate failure analysis. The open and filled-hole laminate failure analysis is used in several important areas, especially in designing mechanically fastened composite joints. Various analytical, empirical, and numerical methods are available for the design of mechanically fastened composite joints. The large number of material and geometrical design variables at the preliminary design stage makes the empirical and numerical methods effortful, expensive, and time-consuming. Therefore, analytical methods are recommended over numerical and empirical methods at the preliminary design stage merely because of their simplification in calculations, making them computationally efficient. Taking this into consideration, current research presents an improvement to the analysis capabilities of the previously introduced analytical method, i.e., the coupled approach of Classical laminate theory (CLT) and Lekhnitskii solutions. These improvements include the development of failure envelops for the open-hole and filled-hole laminates, estimation of optimized filling material for attaining maximum load-bearing capacity of filled-hole laminates, and optimization of stacking sequence for maximum load-bearing capacity of open-hole and filled-hole laminates. From the failure envelop results, it was found that failure envelopes of filled-hole laminates are bigger than open-hole laminates. Furthermore, it was found that the stiffness of the filling material should be equal to the stiffness of the laminate to achieve maximum bearing strength of the filled-hole laminate. It was also demonstrated that the coupled approach of CLT and Lekhnitskii solutions may provide carpet plots that can be utilized to optimize the stacking sequence for open-hole and filled-hole laminates.

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Circumferential vibration analysis of nano-porous-sandwich assembled spherical-cylindrical-conical shells under elastic boundary conditions

Cited by 32 publications

References 67 publications

Mechanical characterization of multifunctional highly porous carbon nanotube‐reinforced foams

Mechanical characterization of multifunctional highly porous carbon nanotube‐reinforced foams

Vibration and Bandgap Behavior of Sandwich Pyramid Lattice Core Plate with Resonant Rings

Analytical Method for the Optimization of the Open-Hole and Filled-Hole Laminates at the Preliminary Design Stage

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