Nonlinear Vibrational Analysis of Nanobeams Embedded in an Elastic Medium including Surface Stress Effects

Azizi, Shohreh; Safaei, Babak; Fattahi, A. M.; Tekere, Memory

doi:10.1155/2015/318539

Cited by 26 publications

(8 citation statements)

References 20 publications

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“…Pulse software used for data processing and the necessary settings were made to improve the data quality. This method is beneficial for obtaining frequency response function (FRF) charts, which represent the system behaviour, and can be used to extract behaviour the system and more importantly the natural frequencies [30][31][32].…”

Section: Experimental Methodsmentioning

confidence: 99%

A New Conceptual Modelling Method for Vehicle Subframe to Evaluate Dynamic Performance of Structures at Conceptual Design Stage

Azaripour

Masoumi

2019

IJAME

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In recent years, the reduction of noise and vibrations caused by the road or internal components of vehicles have been a significant factor in the satisfaction and comfort of the occupants of cars. Therefore, to minimize these vibrations, the dynamic behaviour of the components of the vehicle should be considered in detail to reduce their level by setting useful parameters on structures. Nowadays, the conceptual model method can be regarded as a suitable alternative to the fundamental sophisticated computational techniques in measuring the vibration of vehicle components. Accordingly, the advanced finite element (FE) model examined for the subframe structure under the vehicle engine, and its conceptual model is developed by the one-dimensional beam elements to justify the dynamic behaviour of the subframe. The results of the experiments in the laboratory as well as the advanced subframe model are adapted, and the integrity of the natural frequencies and the mode shapes at low frequencies represented comprehensively. The result of the subframe concept model compared to the experimental model and computer-aided-engineering (CAE) model showed that the modal assurance criterion (MAC) is above 0.75 for the first four mode shapes of subframe structure and is above 0.9 for first and fourth mode shapes, and also the error percentage of natural frequency is lower than 8%. Therefore, for the analysis of the subframe performance in noise, vibration, and harshness (NVH) domain, the presented model could be considered in the conceptual phase design to reduce the solution time significantly.

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Section: Experimental Methodsmentioning

confidence: 99%

A New Conceptual Modelling Method for Vehicle Subframe to Evaluate Dynamic Performance of Structures at Conceptual Design Stage

Azaripour

Masoumi

2019

IJAME

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“…Liu et al [46] developed a novel method for solving nonlinear forced vibrations of functionally graded (FG) piezoelectric shells in multiphysics fields. However, there have been many studies on nonlinear vibration behaviors of various materials [47][48][49][50][51][52][53][54]. The nonlinear forced vibration behaviors of third-order shear deformable nanobeams in the presence of both surface stress and surface inertia due to high surface to volume ratio were investigated by Sahmani et al [55].…”

Section: Introductionmentioning

confidence: 99%

Thermal Buckling and Bending Analyses of Carbon Foam Beams Sandwiched by Composite Faces Under Axial Compression

Safaei

Onyibo²,

Hurdoganoglu³

2022

FU Mech Eng

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The bending and critical buckling loads of a sandwich beam structure subjected to thermal load and axial compression were simulated and temperature distribution across sandwich layers was investigated by finite element analysis and validated analytically. The sandwich structure was consisted of two face sheets and a core, carbon fiber and carbon foam were used as face sheet and core respectively for more efficient stiffness results. The analysis was repeated with different materials to reduce thermal strain and heat flux of sandwich beams. Applying both ends fixed as temperature boundary conditions, temperature induced stresses were observed, steady-state thermal analysis was performed, and conduction through sandwich layers along with their deformation nature were investigated based on the material properties of the combination of face sheets and core. The best material combination was found for the reduction of heat flux and thermal strain, and addition of aerogel material significantly reduced thermal stresses without adding weight to the sandwich structure.

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“…The presented method should have high precision, be simple and could be done with minimum costs. More recently, several theoretical and experimental research works with CNTs as reinforcing fibers have been conducted to determine mechanical and electrical properties of nanotube-based composites [13][14][15][16][17][18][19][20][21][22][23][24][25][26][27].…”

Section: Introductionmentioning

confidence: 99%

Evaluation of elastic modulus in PE/CNT composites subjected to axial loads

Roozpeikar

Fattahi

2018

SN Appl. Sci.

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In this paper, a range of matrix materials from polymer to metal matrix were considered which have extensive applications in various industries. The effective mechanical properties of CNT-based composites were evaluated using a 3-D cylindrical representative volume element (RVE). Continuum mechanics model was used for estimating the effective Young's modulus in the axial direction of the RVE. The load transfer conditions between carbon nanotubes and matrix were modeled using a separated interfacial region. Numerical examples using FEM are presented which demonstrated that load carrying capacities of CNTs in a matrix were significant. With the addition of CNTs into a matrix at volume fractions of only about 2% and 5%, the stiffness of the composite was increase as high as 0.7 and 9.7 times for short and long CNTs, respectively. Also the effect of CNT addition to polyethylene matrix was studied. These simulation was performed using ABAQUS software and the obtained results were consistent with the experimental results reported in the literature.

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Nonlinear Vibrational Analysis of Nanobeams Embedded in an Elastic Medium including Surface Stress Effects

Cited by 26 publications

References 20 publications

A New Conceptual Modelling Method for Vehicle Subframe to Evaluate Dynamic Performance of Structures at Conceptual Design Stage

A New Conceptual Modelling Method for Vehicle Subframe to Evaluate Dynamic Performance of Structures at Conceptual Design Stage

Thermal Buckling and Bending Analyses of Carbon Foam Beams Sandwiched by Composite Faces Under Axial Compression

Evaluation of elastic modulus in PE/CNT composites subjected to axial loads

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