S.Kavitha

Verified email at rediffmail.com

Assistant Professor, Department of Electronics and Instrumentation Engineering, Faculty of Engineering and Technology
Annamalai University



                             

https://researchid.co/kavitha

RESEARCH INTERESTS

Microelectronics and MEMS

14

Scopus Publications

177

Scholar Citations

6

Scholar h-index

4

Scholar i10-index

Scopus Publications

  • Influence of process parameters on hot tensile behavior of rotary friction welded In 718/AISI 410 dissimilar joints
    Alex Anandaraj J, S Rajakumar, V Balasubramanian, and S Kavitha

    CIRP Journal of Manufacturing Science and Technology, ISSN: 17555817, Pages: 830-838, Published: November 2021 Elsevier BV

  • Stir zone stress corrosion cracking behavior of friction stir welded AA7075-T651 aluminum alloy joints
    Prabhuraj Parasuraman, Rajakumar Selvarajan, Balasubramanian Visvalingam, Rajkumar Ilamurugan, and Kavitha Subramanian

    Corrosion Reviews, ISSN: 03346005, Pages: 55-62, Published: 1 February 2021 Walter de Gruyter GmbH
    Abstract AA7075 high-strength aluminum alloy, which has many applications in the aircraft, marine and automobile industries, happens to be susceptible to stress corrosion cracking (SCC) when exposed to corrosive environments, resulting in reduced service life of the components. Inappropriate fabrication processes may augment this behavior. The fabrication of AA7075 components using conventional fusion welding processes may produce defects that include hot cracking and porosity. Friction stir welding (FSW) is a solid-state joining process that can avoid these problems and being widely used for components made of aluminum alloys. Because the joining occurs at a temperature that is lower than the melting point of the material, solidification cracking defects can be eliminated. This study investigates the SCC behavior of FSW AA7075-T651 joints. Horizontal-type SCC test was conducted on circumferential-notched tensile (CNT) specimens exposed to 3.5 wt. % NaCl solutions under various axial stress conditions. The different regions of the fractured specimens, such as the machined notch, SCC region and region of ultimate mechanical failure were analyzed by scanning electron microscopy (SEM) to establish the mechanism of SCC. The threshold stress of parent metal (PM) and stir zone (SZ) of the FSW joint were found to be 242 and 175 MPa, respectively.

  • Effect of Different SiCp Particle Sizes on the Behavior of AA 7075 Hot Deformation Composites Using Processing Maps
    M. Rajamuthamilselvan, S. Rajakumar, and S. Kavitha

    Springer Proceedings in Materials, ISSN: 26623161, eISSN: 2662317X, Pages: 1233-1244, Published: 2021 Springer Singapore
    The mechanical reaction of 7075 Al alloy and Al 7075/15% SiCp with 5 μm, 20 μm, and 63 μm metal-matrix composites is investigated using a hot compression sample. In order to achieve the processing map of the studied material following the dynamic material model, the flow stress curves obtained in temperature ranges of 300–500 °C and strain rate ranges of 0.001–1.0 s-1, respectively. All flow instability zones are analyzed by an optical microscope. Microstructural characterization carried out using an optical microscope image analyzer on compressed composite specimens showed safe domains and non-safe domains. The composites of AA7075/20 μm SiCp showed higher efficiency, flow stress, and lower regimes of instability than alloy.

  • Advanced Signal Processing Techniques for Damage Detection in Reinforced Concrete Beams
    S. Kavitha, K. Sumangala, R. Joseph Daniel, and S. Rajakumar

    Lecture Notes in Civil Engineering, ISSN: 23662557, eISSN: 23662565, Volume: 111, Pages: 87-100, Published: 2021 Springer Singapore

  • Exploratory study on the effect of amplitude on ultrasonic spot welding of aerospace materials
    P. Rajalingam, S. Rajakumar, V. Balasubramanian, S. Kavitha and M. M. Selvan

    Materials Today: Proceedings, eISSN: 22147853, Pages: 799-803, Published: 2021
    Abstract The recent developments in aerospace materials to enhance the properties of strength to weight ratio led to the joining of dissimilar metals like aluminum to titanium alloys particularly applied in parts like fuselage of aeroplanes prefer better processes to join dissimilar metals with higher joint efficiency. The major issue in joining of dissimilar materials by fusion welding techniques is the rate at which the metals reaches its melting point and flow of material on melting. This can be overthrown by choosing solid state techniques over the conventional ones. The process of Ultrasonic spot-welding leads to be a better option as the joint produced utilizes lower energy than other solid-state techniques with higher productivity and better joint strength. The experiment was carried out with AA6061-T6 (75 × 25 × 1.5 mm) and Ti-6Al-4V (75 × 25 × 0.75 mm) in lap welded position. The experiment aimed at evaluating the effect of amplitude of welding with other parameters set constant. The samples joined with amplitude 90% of the power of machine exposed maximum load carrying capacity of 2.9 kN. The samples that failed exhibited ductile mode of fracture with the parent materials pull apart from each other. From the experimental results, the joints fabricated with lower welding amplitude resulted in joints with lower strength and with amplitude to the maximum capacity of machine resulted in joint with strength lower than the joint that were fabricated at optimum level.

  • Mechanical and Microstructural Characteristics of Conventional and Robotic Gas Metal Arc Welded Low Carbon Steel Joints: A Comparative Study
    S. Rajakumar, P. Vimal Kumar, S. Kavitha, and V. Balasubramanian

    Metallography, Microstructure, and Analysis, ISSN: 21929262, eISSN: 21929270, Pages: 337-344, Published: 1 June 2020 Springer Science and Business Media LLC

  • ZnO nanostructured 2D layered SAW based hydrogen gas sensor with enhanced sensitivity
    Nimmala Harathi, S. Kavitha, and Argha Sarkar

    Materials Today: Proceedings, eISSN: 22147853, Pages: 2621-2625, Published: 2020 Elsevier BV
    Abstract Surface acoustic wave sensors have wide variety of applications. The application of SAW sensors includes measurement of different physical parameters like temperature, torque, acceleration, pressure, humidity etc. SAW sensor can also be used as gas sensor with certain construction constrains. The performance of gas sensor can be increased by adding nanomaterial to the MEMS (Micro-Electro Mechanical Systems) based gas sensor. In this study a 2D Surface Acoustic Wave sensor is designed to sense hydrogen gas. The sensor is designed with zinc oxide (ZnO) as sensing layer to increase the sensitivity. The performance of sensor is evaluated with gas and without gas with respect to the displacement and operating frequency. The maximum displacement obtained by the sensor is 0.00857 µm at the operating frequency of 30 MHz in absences of gas and 0.00502 µm displacements in presences of gas at the same operating frequency. Analysis of sensor is done with Finite Element Modeling (FEM). The sensor is simulated with COMSOL Multi Physics.

  • Multicriteria Optimization, Sensitivity Analysis, and Prediction of Bond Characteristics of Vacuum Diffusion Bonded Aero Engine Ti6Al4V Alloy Joints
    T. Pragatheswaran, S. Rajakumar, V. Balasubramanian, S. Kavitha, Vijay Petley, and Shweta Verma

    SAE International Journal of Aerospace, ISSN: 19463855, eISSN: 19463901, Published: 13 December 2019 SAE International

  • Design and Analysis of MEMS Comb Drive Capacitive Accelerometer for SHM and Seismic Applications
    S. Kavitha, R. Joseph Daniel, and K. Sumangala

    Measurement: Journal of the International Measurement Confederation, ISSN: 02632241, Pages: 327-339, Published: 1 November 2016 Elsevier BV

  • High performance MEMS accelerometers for concrete SHM applications and comparison with COTS accelerometers
    S. Kavitha, R. Joseph Daniel, and K. Sumangala

    Mechanical Systems and Signal Processing, ISSN: 08883270, eISSN: 10961216, Volume: 66-67, Pages: 410-424, Published: 2016 Elsevier BV

  • A simple analytical design approach based on computer aided analysis of bulk micromachined piezoresistive MEMS accelerometer for concrete SHM applications
    S. Kavitha, R.Joseph Daniel, and K. Sumangala

    Measurement: Journal of the International Measurement Confederation, ISSN: 02632241, Pages: 3372-3388, Published: 2013 Elsevier BV
    Abstract Structural Health Monitoring (SHM) using non destructive testing generally involves measurement of shift in natural frequency of the monitored structure. This paper presents the simulation using CoventorWare MEMS design tool and analysis of three bulk micromachined piezoresistive MEMS accelerometers namely device A, B and C that are specifically intended for SHM applications. The devices A and B have been designed for the same natural frequency (100 Hz) but with different geometries. The device C has the maximum deflection sensitivity. The modal, piezoresistive and stress analyses show that beam length ( L ) must be less than the half side length (a) of the proof mass for achieving maximum voltage sensitivity. Thus Device-A has been selected for further analysis and the various performance factors for the Device-A have been obtained using simulation experiments and the results show that this device has excellent voltage sensitivity (3.56 mV/g/V), appreciably smaller cross axes sensitivities (32.8 μV/g/V), very low noise floor ( 4.53 μ g / Hz ) and high resolution (12.72 μg) compared with the already reported piezoresistive accelerometer designed for SHM applications and certain general purpose accelerometers available in the global market. The frequency analysis on two devices (Devices A and D) show that the resonant frequency of the sensor should be low for achieving maximum sensitivity and the damping factor ( ξ ) must be 0.7 for getting the maximum bandwidth over which the sensitivity remains constant (60 Hz). Finally, a standard analytical design procedure for the design of piezoresistive MEMS accelerometers has been developed and presented based on the various observations and results of this study. Further, the design approach for high packing density has also evolved.

  • Design and analysis of bulk micromachined piezoresistive MEMS accelerometer for concrete SHM applications
    Sensors and Transducers, eISSN: 17265479, Volume: 144, Pages: 62-75, Published: 2012

  • Computer modelling, design and analysis of piezoresistive MEMS accelerometer for concrete SHM applications
    Journal of Structural Engineering (India), ISSN: 09700137, Pages: 29-34, Published: April 2012

  • Computer aided design and eeffects of beam placement in bulk micromachined piezoresistive MEMS accelerometer for concrete SHM applications
    S.Kavitha, R.Joseph Daniel, and K. Sumangala

    Procedia Engineering, ISSN: 18777058, Pages: 2033-2047, Published: 2012 Elsevier BV

RECENT SCHOLAR PUBLICATIONS

  • Influence of process parameters on hot tensile behavior of rotary friction welded In 718/AISI 410 dissimilar joints
    A Anandaraj, S Rajakumar, V Balasubramanian, S Kavitha
    CIRP Journal of Manufacturing Science and Technology 35, 830-838 2021

  • Advanced Signal Processing Techniques for Damage Detection in Reinforced Concrete Beams
    SR S.Kavitha, K. Sumangala, R. Joseph Daniel
    2021

  • Effect of Different SiCp Particle Sizes on the Behavior of AA 7075 Hot Deformation Composites Using Processing Maps
    M Rajamuthamilselvan, S Rajakumar, S Kavitha
    Advances in Materials Research, 1233-1244 2021

  • Advanced Signal Processing Techniques for Damage Detection in Reinforced Concrete Beams
    S Kavitha, K Sumangala, R Joseph Daniel, S Rajakumar
    Advances in Construction Materials and Structures, 87-100 2021

  • Multi-thresholding with Kapur’s Entropy—A Study Using Bat Algorithm with Different Search Operators
    V Rajinikanth, N Dey, S Kavitha
    Applications of bat algorithm and its variants, 61-78 2021

  • Exploratory study on the effect of amplitude on ultrasonic spot welding of aerospace materials
    P Rajalingam, S Rajakumar, V Balasubramanian, S Kavitha, MRM Selvan
    Materials Today: Proceedings 45, 799-803 2021

  • Mechanical and Microstructural Characteristics of Conventional and Robotic Gas Metal Arc Welded Low Carbon Steel Joints: A Comparative Study
    S Rajakumar, P Vimal Kumar, S Kavitha, V Balasubramanian
    Metallography, Microstructure, and Analysis 9 (3), 337-344 2020

  • Multicriteria Optimization, Sensitivity Analysis and Prediction of Bond Characteristics of Vacuum Diffusion Bonded Aero Engine Ti6Al4V Alloy Joints
    T Pragatheswaran, S Rajakumar, V Balasubramanian, S Kavitha, ...
    International Journal of Aerospace (SAE) 12 (2), 77-96 2019

  • Identification Of The Most Critical Friction Stir Welding Process And Tool Parameters To Attain A Maximum Tensile Strength Of The AA6061-T6 Aluminium Alloy *
    SK S. Rajakumar
    International Journal of Research in Advent Technology, Special Issue 2018

  • DUAL AXES FOLDED BEAM COMB DRIVE CAPACITIVE MEMS ACCELEROMETER FOR GREATER CROSS AXIS PERFORMANCE
    S.Kannan, R. Joseph Daniel, S Kavitha
    ISSS National Conference on MEMS, Smart Materials, Structures and Systems 2018

  • Multiresonant frequency piezoelectric energy harvesters integrated with high sensitivity piezoelectric accelerometer for bridge health monitoring applications
    PR Bhaskaran, JD Rathnam, S Koilmani, S Kavitha
    Smart Materials Research 2017 2017

  • Design and Analysis of MEMS Comb Drive Capacitive Accelerometer for SHM and Seismic Applications
    S Kavitha, KS R.JosephDaniel
    Measurement 93 (Nov-16), 327-339 2016

  • Integrated Piezoelectric Accelerometer Harvesters for SHM Applications
    B. Prathish Raajaa, R. Joseph Daniel, K. Sumangala, S Kavitha
    Smart Materials, Structures and Systems 2016

  • High performance MEMS accelerometers for concrete SHM applications and comparison with COTS accelerometers
    S Kavitha, KS R.Joseph Daniel
    Mechanical Systems and Signal Processing 66 (2016), 410–424 2016

  • Enhancing the properties of Ti6Al4V as a biomedical material: a review
    VE Annamalai, S Kavitha, SA Ramji
    The Open Materials Science Journal 8 (1) 2014

  • A Novel MEMS Capacitive Accelerometer Structure for Structural Health Monitoring (SHM) and Seismic Applications
    S Kavitha, KS R.JosephDaniel
    International Conference on MEMS and Sensors 2014

  • A simple analytical design approach based on computer aided analysis of bulk micromachined piezoresistive MEMS accelerometer for concrete SHM applications
    S Kavitha, KS R.JosephDaniel
    Measurement 46 (2013), 3372–3388 2013

  • Performance Comparison Studies on MEMS Piezoresistive and Comb Drive Capacitive Accelerometers for Concrete SHM applications
    S Kavitha, KS R.JosephDaniel
    6th ISSS National Conference on MEMS 2013

  • LOW FREQUENCY SMALL MEMS COMB DRIVE ACCELEROMETER FOR CONCRETE SHM APPLICATIONS
    S Kavitha, KSAS R. Joseph Daniel
    Recent Trends in Instrumentation and Control 2013

  • Design and Analysis of Bulk Micromachined Piezoresistive MEMS Accelerometer for Concrete SHM Applications
    S Kavitha, KS R.JosephDaniel
    Sensors & Transducers 144 (2012), 62-75 2012

MOST CITED SCHOLAR PUBLICATIONS

  • Design and Analysis of MEMS Comb Drive Capacitive Accelerometer for SHM and Seismic Applications
    S Kavitha, KS R.JosephDaniel
    Measurement 93 (Nov-16), 327-339 2016
    Citations: 54

  • High performance MEMS accelerometers for concrete SHM applications and comparison with COTS accelerometers
    S Kavitha, KS R.Joseph Daniel
    Mechanical Systems and Signal Processing 66 (2016), 410–424 2016
    Citations: 42

  • A simple analytical design approach based on computer aided analysis of bulk micromachined piezoresistive MEMS accelerometer for concrete SHM applications
    S Kavitha, KS R.JosephDaniel
    Measurement 46 (2013), 3372–3388 2013
    Citations: 33

  • Enhancing the properties of Ti6Al4V as a biomedical material: a review
    VE Annamalai, S Kavitha, SA Ramji
    The Open Materials Science Journal 8 (1) 2014
    Citations: 15

  • Multiresonant frequency piezoelectric energy harvesters integrated with high sensitivity piezoelectric accelerometer for bridge health monitoring applications
    PR Bhaskaran, JD Rathnam, S Koilmani, S Kavitha
    Smart Materials Research 2017 2017
    Citations: 8

  • Design and Analysis of Bulk Micromachined Piezoresistive MEMS Accelerometer for Concrete SHM Applications
    S Kavitha, KS R.JosephDaniel
    Sensors & Transducers 144 (2012), 62-75 2012
    Citations: 8

  • Design and Analysis of Piezo resistive MEMS Accelerometer for Concrete SHM Applications
    S Kavitha, KS R.JosephDaniel
    6th International Conference on Smart Materials Structures and Systems 2012
    Citations: Piezo resistive MEMS Accelerometer for Concrete SHM Applications

  • Computer aided design and effects of beam placement in Bulk Micromacnined Piezoresistive MEMS accelerometer for Concrete SHM Applications
    S Kavitha, RJDK Sumangala
    Procedia Engineering 38 (2012), 2033-2047 2012
    Citations: 5

  • Mechanical and Microstructural Characteristics of Conventional and Robotic Gas Metal Arc Welded Low Carbon Steel Joints: A Comparative Study
    S Rajakumar, P Vimal Kumar, S Kavitha, V Balasubramanian
    Metallography, Microstructure, and Analysis 9 (3), 337-344 2020
    Citations: 3

  • Multi-thresholding with Kapur’s Entropy—A Study Using Bat Algorithm with Different Search Operators
    V Rajinikanth, N Dey, S Kavitha
    Applications of bat algorithm and its variants, 61-78 2021
    Citations: 2

  • Exploratory study on the effect of amplitude on ultrasonic spot welding of aerospace materials
    P Rajalingam, S Rajakumar, V Balasubramanian, S Kavitha, MRM Selvan
    Materials Today: Proceedings 45, 799-803 2021
    Citations: 2

  • Multicriteria Optimization, Sensitivity Analysis and Prediction of Bond Characteristics of Vacuum Diffusion Bonded Aero Engine Ti6Al4V Alloy Joints
    T Pragatheswaran, S Rajakumar, V Balasubramanian, S Kavitha, ...
    International Journal of Aerospace (SAE) 12 (2), 77-96 2019
    Citations: 2

  • Computer modelling, design and analysis of piezoresistive MEMS accelerometer for concrete SHM applications
    S Kavitha, KS R.JosephDaniel
    Seventh Structural Engineering Convection, Annamalai University,Chidambaram 2012
    Citations: 2

  • Influence of process parameters on hot tensile behavior of rotary friction welded In 718/AISI 410 dissimilar joints
    A Anandaraj, S Rajakumar, V Balasubramanian, S Kavitha
    CIRP Journal of Manufacturing Science and Technology 35, 830-838 2021
    Citations: 1