In this work, the dynamic instability analysis of a rotating CNT reinforced fiber reinforced polymer (CNTFRP) composite plate is performed under in-plane periodic loads. The elastic properties of CNTFRP composite plate are obtained using the modified Halpin-Tsai equations and the two phase micromechanical approach. The governing differential equations of motion of the rotating fiber reinforced polymer composite (FRP) plate without and with addition of CNT are derived in the finite element formulation using first order shear deformation (FSDT) by incorporating the effects of pre-stress induced stiffness and displacement-dependent stiffness due to steady state rotation. The validity of developed finite element model is studied by comparing the fundamental natural frequency and dynamic instability regions using present FEA with those available in literature. Various parametric studies are also performed to study the effect of CNT volume fraction and CNT aspect ratio on the dynamic instability regions of CNTFRPC plate. It was seen that the primary and secondary dynamic instability regions of the composite plate are significantly influenced by CNT volume fraction. © 2018 Author(s).

Lakshmi Pathi Jakkamputi

Mechanical

School of Mechanical Engineering

Chennai Campus

Vasudevan R

Department of Design and Automation

Vellore Campus

Vellore Institute of Technology (VIT) is a private university located in&nbsp;Tamil Nadu, India. Founded in 1984, as Vellore Engineering College, the institution offers 20 undergraduate, 34 postgraduate, four integrated and four research programs. It has campuses in Vellore, Amravati, Bhopal and Chennai.

VIT is one of the top ranked private universities in India according to NIRF, THE and QS Rankings.&nbsp;Govt. of India has recognized&nbsp;VIT, Vellore as an&nbsp;Institution of Eminence. This has allowed VIT to take independent quality initiatives and move up in world ranking.

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VIT University

Numerical investigation of dynamic instability of a rotating CNT reinforced composite plate

AIP Conference Proceedings

In the present work, the dynamic characterization of carbon nano tubes (CNT)-reinforced GFRP composite beam under elevated temperature has been investigated experimentally. GFRP composite beams without and with CNT reinforcement have been fabricated using vacuum-assisted hand lay-up technique. Natural frequencies and damping ratio of the composite beams for the first three modes are being measured under clamped-free and clamped–clamped end conditions using experimental modal analysis. Further, the effect of variation of temperature of the GFRP composite beams without and with CNT reinforcement on natural frequencies and damping ratio have been studied. It was observed that the fundamental natural frequency of the CNT-GFRP hybrid composite beam is approximately 17.43% and 18.46% higher than that of GFRP composite beams without CNT reinforcement under CF and CC boundary conditions, respectively. The fundamental natural frequency of CNT-GFRP composite beam decreases by 3.47% and 11.19%, whereas the damping ratio at first mode increases by 22.64% and 35.41% under clamped-free (CF) and CC boundary conditions, respectively when the temperature increased from 30°C to 60°C. POLYM. COMPOS., 40:464–470, 2019. © 2017 Society of Plastics Engineers. © 2017 Society of Plastics Engineers

Polymer Composites

Dynamic characterization of CNT‐reinforced hybrid polymer composite beam under elevated temperature—an experimental study

Composite Structures

Dynamic instability assessment of carbon nanotube/fiber/polymer multiscale composite skew plates with delamination based on HSDT

In this paper, the dynamic instability characteristics of sandwich panels with carbon nanotube (CNT) reinforced facesheets subjected to in-plane periodic load is investigated using a shear flexible QUAD-8 serendipity element. The formulation accounts for the realistic variation of the displacements through the thickness, possible discontinuity in slope at the interface and the thickness stretch affecting the transverse deflection. The influence of the aerodynamic force due to airflow over the plate, the in-plane and the rotary inertia effects are also included in the formulation. The accuracy of the present formulation is demonstrated considering the problems for which solutions are available. A detailed numerical study is carried out to bring out the efficacy of the present higher-order plate theory over the first-order plate theory. The present study examines the influence of the volume fraction of the CNT, core-to-facesheet thickness, the plate thickness and aspect ratio, damping and temperature on the dynamic instability boundaries and its associated origin of instability forcing frequencies. The effect of airflow over such sandwich plate is also investigated. The boundaries of the principal instability region are represented in the non-dimensional excitation frequency-load amplitude plane. © 2016 Elsevier Ltd

Dynamic instability analysis of sandwich plates with CNT reinforced facesheets

Dynamic stability analysis of carbon nanotube-reinforced functionally graded cylindrical panels using the element-free kp-Ritz method

International Journal of Mechanical Sciences

Dynamics of rotating composite beams: A comparative study between CNT reinforced polymer composite beams and laminated composite beams using spectral finite elements

Journal	AIP Conference Proceedings
Publisher	Author(s)
ISSN	0094243X
Open Access	0