Restoration of Natural Frequency of Cracked Cantilever Beam Using CNT Composite Patch: A Finite Element Study

Nahas, Mahmoud Nadim; Alzahrani, Mahmoud A.

doi:10.1155/2013/678412

Cited by 5 publications

(3 citation statements)

References 31 publications

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“…So in order to evaluate the mechanical characteristics of this material it needs the analytical evaluation as well because, it has the anisotropic property and complicate structure. Hence in this paper, the modeled specimen was analyzed by using commercially available finite element analysis software (ANSYS) [12][13][14][15][16][17][18][19].…”

Section: Introductionmentioning

confidence: 99%

Finite Element Analysis of IPN Reinforced Woven Fabric Composite

Suresh¹,

Jayakumari

Dinesh³

2017

Matéria (Rio J.)

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A series of E-Glass fiber reinforced polyurethane (PU)/vinyl ester(VER) resin interpenetrating polymer network (IPN) composites were prepared. The Mechanical Properties like tensile, flexural and impact of IPN composite were studied. Results revealed that addition of PU increases the impact strength by 8.33%, 7.69%, 14.28%, 12.5%, 11.11% for the proportinate of 0%PU, 10%PU, 20%PU, 30%PU, 40%PU, 50%PU respectively, at the slight expense of decrease in flexural and tensile modulus. The obtained experimental results were compared with the Finite Element Analysis data's (ANSYS 10). The comparison shows good agreement with experimental data's.

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Section: Introductionmentioning

confidence: 99%

Finite Element Analysis of IPN Reinforced Woven Fabric Composite

Suresh¹,

Jayakumari

Dinesh³

2017

Matéria (Rio J.)

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“…The stresses acting in the longitudinal direction was assumed to be negligible. [27][28][29][30][31][32] Results and discussions…”

Section: Stiffness Testmentioning

confidence: 99%

“…All the six FE models show the similar kind of mechanism, from the shear crack initiation (blue regionlow-intensity stress) continues with shear crack propagation (green region-medium-intensity stress) at last ends up with burst (red region-high-intensity stress), along the entire length (longitudinal) of the pipe. [30][31][32]…”

Section: Fea Of Burst Testmentioning

confidence: 99%

Analyzing the mechanical behavior of E-glass fibre-reinforced interpenetrating polymer network composite pipe

Suresh¹,

Jayakumari²

2016

Journal of Composite Materials

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In this study, a mixture of vinyl ester (VER) and polyurethane (PU) prepolymer was used in the field of pipe manufacturing as a matrix material (interpenetrating polymer networks) with E-glass fibre as reinforcement. In order to evaluate the mechanical strength of the fibre-reinforced VER-PU interpenetrating polymer network composite pipe, tests like hydrostatic, hoop, stiffness, and axial compression were conducted systematically with five proportions of PU-loaded VER (0%, 10%, 20%, 30%, 40%, and 50%). It was observed that during the stiffness test, all the PU-loaded VER specimens have regained its original shape, size, and also retains its structural integrity. VER glass fibre composite pipes (0% PU) exhibited crazing, wall delamination, and rupture on compression. With increase in PU content, there were no such effects after the compression, but a slight drop in mechanical properties like hoop, stiffness, and axial compression was observed. The obtained experimental results were found to be in good agreement with finite element analysis data.

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An Improved Variational Vibration Model of Damaged Beams to Obtain an Unconditionally Numerical Stable Model

Alzahrani

Choi

2015

Volume 8: 27th Conference on Mechanical Vibration and Noise

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Fault detection methods are significant in health monitoring of critical system components, including aerospace applications. Failure in such systems is unacceptable, even though engineers try to achieve very low failure probability in these systems. The ability to accurately model and analyze the characteristics of such systems would reduce the rates of false positives and missed detections in structural health monitoring. Previously, a detection model was developed to investigate the effects of combined impact of geometrical variations of machining errors and crack presence in beams. The model utilized the Leap Frog finite difference method, which had a restrictive condition on stability of the numerical method. This restriction would show to be critical with materials with high modulus and low density values. The proposed work will overcome the drawback of the current detection model by utilizing other finite difference methods to remove or relax the stability condition of the method; namely, the Weighted Average method and Du Fort-Frankel method. The presented result clearly shows that the Theta method could be used to obtain an unconditionally stable finite difference model with high accuracy. It is also observed that the result from the Du Fort-Frankel method is still conditionally stable, but the stability condition is more relaxed compared to the Leap Frog method. The results obtained from the improved model show good agreement with the example in the literature. The improved model is also applied to investigate a cantilevered beam with the presence of cracks and geometrical variations.

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Restoration of Natural Frequency of Cracked Cantilever Beam Using CNT Composite Patch: A Finite Element Study

Cited by 5 publications

References 31 publications

Finite Element Analysis of IPN Reinforced Woven Fabric Composite

Finite Element Analysis of IPN Reinforced Woven Fabric Composite

Analyzing the mechanical behavior of E-glass fibre-reinforced interpenetrating polymer network composite pipe

An Improved Variational Vibration Model of Damaged Beams to Obtain an Unconditionally Numerical Stable Model

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