WITHDRAWN: Optimization design of vibration characterizations for functionally graded porous metal sandwich plate structure

Njim, Emad Kadum; Bakhy, Sadeq H.; Al-Waily, Muhannad

doi:10.1016/j.matpr.2021.03.235

Cited by 14 publications

(2 citation statements)

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“…Theoretical results confirmed empirically, literature findings and simulation showed how 3D printing could create complex lattice cores [27]. The optimal design of core characteristics and skins is also discussed for inhomogeneous [28] and soft polymers [29]. To predict the stability of isotropic composite plates reinforced by different types of powder, Chiad et al (2020) developed a combined finite element and experimental work [30].…”

Section: Introductionmentioning

confidence: 67%

Sandwiched Plate Vibration Analysis with Open and Closed Lattice Cell Core

Raad

Njim

Jweeg³

et al. 2023

Phys. Chem. Solid St.

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This work attempts to replace the sandwich core's traditional shape and material with a cellular pattern, where the cells have a regular shape, distribution, and size. The contribution of this paper is to design two structures, one open-celled and the other closed, and to evaluate the performance of sandwich plates with lattice cell core as it is used for many industrial applications, particularly in automobile engineering. The new theoretical formulations are constructed for two structures to find the free vibration characteristics. The results of the new design are compared with the traditional shape. Derivation of equations to predict mechanical properties based on relative density with the chosen shapes, specific vibration equation of three-layer sandwich plate, and substitution by equation using excel sheet. Results are promising, and the effectiveness of cellular pattern theoretical analysis estimation. Limitations and error rates for the mechanical properties come through the empirical equations, and their ratio to the relative density values are higher depending on the behavior of the core material. Findings reveal, with open cell decrease in modulus of elasticity by (PLA: -90.4%) and (TPU: -90.4%), increases natural frequency by (PLA: 44.5%) and (TPU: 46.4%), as for closed-cell decreases in the modulus of elasticity by (PLA: -66.9%) and (TPU: -64.4%), increases natural frequency by (PLA: 36%) and (TPU: 37.7%). Converting a solid substance or replacing a foam form with a cellular pattern is one way to better performance and save weight through the selected cell pattern in absorbing the energy of the vibration wave.

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Section: Introductionmentioning

confidence: 67%

Sandwiched Plate Vibration Analysis with Open and Closed Lattice Cell Core

Raad

Njim

Jweeg³

et al. 2023

Phys. Chem. Solid St.

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“…Wang et al [ 34 ] proposed a high-efficiency optimization procedure to obtain the optimal structural stiffness and vibration attenuation of laser-welded corrugated-core sandwich panels with polyurea-metal skins. By combing the response surface optimization method with finite element models established in ANSYS software, Njim et al [ 35 ] conducted the optimization design of functionally graded (FG) porous sandwich sheets, in which the maximized fundamental frequencies and the minimized mass of the FG core were considered.…”

Section: Introductionmentioning

confidence: 99%

Optimization Design of the Bending-Vibration Resistance of Magnetorheological Elastomer Carbon Fibre Reinforced Polymer Sandwich Sheets

et al. 2023

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An optimization design of the bending-vibration resistance of magnetorheological elastomer carbon fibre reinforced polymer sandwich sheets (MECFRPSSs) was studied in this paper. Initially, by adopting the classical laminate theory, the Reddy’s high-order shear deformation theory, the Rayleigh-Ritz method, etc., an analytical model of the MECFRPSSs was established to predict both bending and vibration parameters, with the three-point bending forces and a pulse load being considered separately. After the validation of the model was completed, the optimization design work of the MECFRPSSs was conducted based on an optimization model developed, in which the thickness, modulus, and density ratios of magnetorheological elastomer core to carbon fibre reinforced polymer were taken as design variables, and static bending stiffness, the averaged damping, and dynamic stiffness parameters were chosen as objective functions. Subsequently, an artificial bee colony algorithm was adopted to execute single-objective, dual-objective, and multi-objective optimizations to obtain the optimal design parameters of such structures, with the convergence effectiveness being examined in a validation example. It was found that it was hard to improve the bending, damping, and dynamic stiffness behaviours of the structure simultaneously as the values of design variables increased. Some compromised results of design parameters need to be determined, which are based on Pareto-optimal solutions. In further engineering application of the MECFRPSSs, it is suggested to use the corresponding design parameters related to a turning point to better exert their bending-vibration resistance.

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