Non-linear vibration and instability of a randomly distributed carbon nanotube fiber-reinforced composite (CNTFRC) plate under the action of different types of non-uniform in-plane periodic loadings are presented in this study. The composite plates are modeled considering von Karman non-linearity and Higher-order shear deformation theory (HSDT). The analytical expression for stresses ( σ x x , σ y y , and τ x y ) distribution within the CNTFRC plate due to non-uniform loads is developed by solving the in-plane elasticity problem using Airy’s stress approach. Using these stresses, Hamilton’s principle is applied to derive the non-linear partial differential equations for dynamic instability and non-linear vibration of CNTFRC plates. Employing the Galerkin method, the non-linear partial differential equations are transformed into a set of non-linear ordinary differential (Mathieu type) equations. After dropping the nonlinearity terms, the linear ordinary differential equations are solved by using Bolotin’s method to trace the boundaries of the dynamic instability region corresponding to periods 2T and T. In the end, the non-linear ordinary differential equations are solved by using the Incremental Harmonic Balance method (IHB) for analyzing the non-linear vibration behavior of the CNTFRC plate. The result obtained from the current work will help in the appropriate design of the CNTFRC plate against stability and vibration in presence of non-uniform in-plane loadings.

Non-linear vibration and instability of multi-phase composite plate subjected to non-uniform in-plane parametric excitation: Semi-analytical investigation

The use of carbon nanotubes (CNTs) in augmenting the mechanical properties of fiber-reinforced laminated composites is a fact. In this paper, the semianalytical studies on the dynamic insta...

Semianalytical Development of Dynamic Instability and Response of a Multiscale Laminated Hybrid Composite Plate

Carbon nanotubes (CNTs) have attracted many researchers during the last three decades due to their versatile nature and exceptional mechanical properties. In this study, a functionally grad...

Instability and Vibration Analyses of Functionally Graded Carbon Nanotube–Reinforced Laminated Composite Plate Subjected to Localized In-Plane Periodic Loading

Carbon nanotube has attracted many researchers from last two decades due to its exceptional mechanical and multiuse properties. In this article, a semi-analytical study is performed to determine the dynamic instability of a Functionally Graded Carbon Nanotube Reinforced Composite (FG-CNTRC) plate exposed to uniform and various non-uniform in-plane loadings. The efficient mechanical properties for the plate are estimated using rule of mixture where CNTs are distributed aligned and distributed across the plates’ thickness such as Uniformly distributed (UD) and Functionally Graded (FG-X and FG-O). Here, The FG-CNTRC plate is modeled by means of higher order shear deformation theory (HSDT) and the stress distributions (σxx, σyy, τxy) within the plate because of non-uniform loadings are calculated using Airy’s stress method. Then, the Hamilton’s principle is applied to obtain the governing partial differential equations of the FG-CNTRC plate, and which is later solved with the help of Galerkin’s method to convert it to ordinary (Mathieu type) differential equations. Next, these Mathieu type equations are solved employing Bolotin’s method to trace the instability boundaries corresponding to period 2T. At last, the consequence of different parameters like volume fraction of CNT, types of non-uniform loading, static load factor, types of CNTs distribution on instability of the FG-CNTRC plate are examined.

Parametric Instability Analysis of Functionally Graded CNT-Reinforced Composite (FG-CNTRC) Plate Subjected to Different Types of Non-uniform In-Plane Loading

Since printed capacitive sensors provide better sensing performance, they can be used in automotive bezel applications. It is necessary to fabricate such sensors and apply an optimization approach for choosing the optimal sensor pattern. In the present work, an effort was made to formulate interdigitated pattern-printed Silver (Ag) electrode flexible sensors and adopt the Taguchi Grey Relational (TGR)-based optimization approach to enhance the flexible sensor’s panel for enhanced automobile infotainment applications. The optimization technique was performed to derive better design considerations and analyze the influence of the sensor’s parameters on change in capacitance when touched and production cost. The fabricated flexible printed sensors can provide better sensing properties. A design pattern which integrates an overlap of 15 mm, an electrode line width of 0.8 mm, and an electrode gap 0.8 mm can produce a higher change in capacitance and achieve a lower weight. The overlap has a greater influence on sensor performance owing to its optimization of spatial interpolation.

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Design, Fabrication, and Optimization of a Printed Ag Nanoparticle-Based Flexible Capacitive Sensor for Automotive IVI Bezel Display Applications

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 C...

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

Reliable assessment of an individual’s driving skills is very important. The growing population of unskilled drivers will result in disastrous and fatal road accidents. Current situation demands better and accurate automated assessment technique for driver performance. This research aims to development a portable independent assessment system which can be installed in any vehicle. This system will monitor and understand the driver’s skills based on the data from sensors and access their performance using machine learning algorithm. Machine learning based classifiers with more than 90% accuracy are developed for classifying the driver skills. This proposed system will ensure one from possibilities of beaching the formal process and getting the license without qualification, it is a suggestion to the conventional method of assessment. This system could help in building better-skilled driver on the road for a healthy road environment.

https://ieeexplore.ieee.org/ielx7/6287639/6514899/09992235.pdf

Jakkamputi Lakshmi Pathi

Papers

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

Assessment of Vehicle Handling Performance of Drivers Using Machine Learning Algorithms