A comparative study on resistance spot and laser beam spot welding of ultra-high strength steel for automotive applications Paluchamy Rajalingam, Selvarajan Rajakumar, Tushar Sonar, Subramanian Kavitha International Journal of Lightweight Materials and Manufacture, 2024 In this study, the effect of resistance spot welding (RSW) and laser beam spot welding (LBSW) processes on evolution of microstructure, load endurance capabilities, heat affected zone (HAZ) softening, and corrosion resistance of ultra-high-strength (UHSS) steel joints welded in lap joint design is investigated. The UHSS sheets of dual phase 1000 grade (UHSDP1000) having 1.20 mm thickness were joined using the RSW and LBSW parameters optimized by response surface methodology (RSM). The microstructural features of welding regions of RSW and LBSW joints were studied using optical microscopy (OM). The load endurance capabilities of RSW and LBSW joints were assessed using the tensile shear failure load (TSFL) and cross-tensile failure load (CTFL) tests. The ruptured surfaces of TSFL and CTFL tested samples were examined utilizing scanning electron microscopy (SEM). The microhardness distribution of divergent regions of RSW and LBSW joints was evaluated and imputed to the TSFL and CTFL failure of joints. The corrosion resistance of RSW and LBSW joints was analyzed using potentiodynamic corrosion and immersion corrosion tests. The RSW joints showed 183% and 62.79% greater TSFL and CTFL endurance capabilities than LBSW joints. The TSFL and CTFL endurance capabilities of LBSW joints are inferior to RSW joints due to the smaller load bearing area. It causes the stress concentration in FZ and HAZ of LBSW joints. The RSW joints and LBSW joints disclosed TSFL and CTFL failure in button pull out rupture mode with tearing of HAZ. The failure of RSW and LBSW joints in HAZ is due to the softening caused by martensitic tempering and coarsening of grains. The LBSW joints disclosed inferior resistance to corrosion than RSW joints due to the higher martensite content which contributes to greater fraction of favorable pitting sites and decreased corrosion resistance.
Muga (Antheraea assamensis) silk electrospun scaffold for biomedical applications Subramanian Sundaramoorthy, Karthic Kumar Balan, Saravanan Ramaiyan Alwar, I. Caraline, S. Gowri, S. Kavitha International Journal of Materials Research, 2024 Wild silk varieties are less explored in the field of biomaterials than cultivated mulberry silk (Bombyx Mori). In the present work, an electrospun scaffold was produced from wild silk, muga (Antheraea assamensis), and it was assessed for the properties required for biomaterials. Scanning electron microscopy images showed that the electrospun fibers were formed without beads, and the majority of the fibers had diameters in the range of 500–900 nm. The scaffold started to decompose at 210 °C, which is higher than the temperature used for sterilization of the scaffold. The PBS uptake percentage was found to be 400 %, which is sufficient for the absorption of the medium used during cell culture. The scaffold had a hemolysis value of less than 5 %, which indicates that the scaffold exhibits good blood compatibility. The MTT assay showed cell viability of more than 80 % after 24 h and 48 h, and fluorescence microscopy showed that cells adhered and spread on the surface of the scaffold. The results show that muga silk electrospun mat can be used as an ideal biomaterial.
Ultrasonic spot-welding of AA 6061-T6 aluminium alloy: Optimization of process parameters, microstructural characteristics and mechanical properties of spot joints P. Rajalingam, S. Rajakumar, S. Kavitha, Tushar Sonar International Journal of Lightweight Materials and Manufacture, 2024 The main objective of this investigation is to optimize the ultrasonic spot welding (USW) parameters specifically welding time, amplitude and pressure for enhancing the tensile shear fracture load of lap joints of AA 6061-T6 aluminium alloy for automotive applications. The statistical response surface methodology (RSM) was utilized for generating strength prediction models (SPM) and validated using analysis of variance (ANOVA). The response surfaces were created using RSM and analyzed. The effect of USW parameters on macrostructure, microstructure and tensile fracture load (TSFL) of USW joints was studied. From the results, it was observed that the USW joints created using the welding amplitude of 100%, welding time of 21 s and welding pressure of 6 bar exhibited greater TSFL capacity of 5.08 kN. The SPM accurately predicted the TSFL of USW joints within 5% error on 95% confidence. Welding pressure disclosed major effect on TSFL of USW joints followed by welding amplitude and time. The greater TSFL of USW joints is imputed to the better coalescence of weld surfaces and refined microstructure.
Design and analysis of bulk micromachined piezoresistive MEMS accelerometer for concrete SHM applications Sensors and Transducers, 2012
Computer modelling, design and analysis of piezoresistive MEMS accelerometer for concrete SHM applications Journal of Structural Engineering India, 2012
Discrete and continuous state dynamic programming approach for piecewise quadratic optimization problem International Review on Modelling and Simulations, 2012
U-Net ensemble based segmentation and RESNET for brain tumor detection of magnetic resonance imaging (MRI) SSRKSVRR Selvarajan International Journal of System Assurance Engineering and Management , 2025 2025 Citations: 7
Low frequency design of high-performance MEMS based comb drive folded beam type capacitive accelerometers for structural health monitoring of concrete structure SKS Rajakumar International Journal on Interactive Design and Manufacturing (IJIDeM) , 2025 2025 Citations: 1
A comparative study on resistance spot and laser beam spot welding of ultra-high strength steel for automotive applications P Rajalingam, S Rajakumar, T Sonar, S Kavitha International Journal of Lightweight Materials and Manufacture 7 (5), 648-661 , 2024 2024 Citations: 30
Optimization of ultrasonic welding parameters to maximize the tensile shear fracture load bearing capability of lap welded ABS plastic sheets S Rajakumar, S Kavitha, T Sonar International Journal on Interactive Design and Manufacturing (IJIDeM) 18 (5 … , 2024 2024 Citations: 4
Comprehensive assessment of combining ability and heterosis for the development of superior three-line hybrids in rice (Oryza sativa L.) R Nivedha, S Manonmani, T Kalaimagal, M Raveendran, S Kavitha Electronic Journal of Plant Breeding 15 (1), 31-41 , 2024 2024 Citations: 14
Ultrasonic spot-welding of AA 6061-T6 aluminium alloy: Optimization of process parameters, microstructural characteristics and mechanical properties of spot joints P Rajalingam, S Rajakumar, S Kavitha, T Sonar International Journal of Lightweight Materials and Manufacture 7 (1), 25-36 , 2024 2024 Citations: 32
Optimization of laser beam spot welding (LBSW) parameters to maximize the load bearing capability of AHS-DP1000 steel lap joints P Rajalingam, S Rajakumar, V Balasubramanian, T Sonar, S Kavitha International Journal on Interactive Design and Manufacturing (IJIDeM) 17 (6 … , 2023 2023 Citations: 11
Studies on genetic variability, trait contribution for improved green fodder yield in lucerne (Medicago sativa L.). A Aruna, T Ezhilarasi, KN Ganesan, S Kavitha, M Thirunavukkarasu Electronic Journal of Plant Breeding 14 (3) , 2023 2023 Citations: 4
Prevention of sensitization and fracture analysis of keyhole plasma arc welded AISI 304 HCu tube joints PGSI Jones, S Rajakumar, S Kavitha, V Balasubramanian Journal of Failure Analysis and Prevention 23 (4), 1538-1549 , 2023 2023 Citations: 2
Multicriteria optimization of the weld characteristics of keyhole plasma arc welding on super austenitic stainless steel: a mathematical approach PG Sam Infant Jones, S Rajakumar, S Kavitha, V Balasubramanian International Journal on Interactive Design and Manufacturing (IJIDeM) 17 (4 … , 2023 2023 Citations: 1
Characterization of CuO–SnO2 composite nano powder by hydrothermal method for solar cell K Srinivasan, V Rukkumani, V Radhika, M Saravanakumar, S Kavitha Machine Learning and the Internet of Things in Solar Power Generation, 123-140 , 2023 2023 Citations: 3
Process Modelling And Characterisation Of Friction Surface Deposit Of Extruded nickel Aluminum Bronze Over Cast Nickel Aluminum Bronze N Muthukumar, K Srinivasan, S Rajakumar, S Kavitha, ... Advances in Materials and Processing Technologies 9 (3), 1116-1136 , 2023 2023 Citations: 1
Analyzing the mechanical and thermal property of hybrid natural fibers through reinforced polylactic acid composites JS Babu, R Girimurugan, N Prabhu, S Kavitha, L Girisha ADVANCES IN MANUFACTURING TECHNOLOGIES AND APPLICATION OF ARTIFICIAL … , 2023 2023 Citations: 10
A process of interpreting the performance of friction stir welding on two dissimilar materials R Jayaraman, R Girimurugan, T Sankaramoorthy, R Subbiah, S Kavitha ADVANCES IN MANUFACTURING TECHNOLOGIES AND APPLICATION OF ARTIFICIAL … , 2023 2023 Citations: 25
Keyhole and conduction mode of welding AISI 304HCu: A comparison PGSI Jones, S Rajakumar, S Kavitha, V Balasubramanian Transactions of the Indian Institute of Metals 76 (5), 1349-1358 , 2023 2023 Citations: 2
Tensile shear fracture load bearing capability, softening of HAZ and microstructural characteristics of resistance spot welded DP-1000 steel joints P Rajalingam, S Rajakumar, V Balasubramanian, T Sonar, S Kavitha Materials Testing 65 (1), 94-110 , 2023 2023 Citations: 25
Experimental studies on key-hole plasma arc welding process parameters of AISI 304 HCu stainless steel tube joints PG Sam Infant Jones, S Rajakumar, S Kavitha, V Balasubramanian Welding International 36 (11), 655-667 , 2022 2022 Citations: 10
Identification of anaerobic germination tolerant landraces and validation of molecular marker in rice (Oryza sativa L.). G Mohanapriya, S Kavitha, V Thiruvengadam, M Raveendran, ... Electronic Journal of Plant Breeding 13 (3) , 2022 2022 Citations: 10
Predicting the load-bearing capability of resistance spot welded advanced high strength DP-1000 steel spot joints for automotive structural and body frame applications P Rajalingam, S Rajakumar, V Balasubramanian, T Sonar, S Kavitha Manufacturing Technology Today 21 (7-8), 13-22 , 2022 2022 Citations: 1
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 2021 Citations: 16
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 2016 Citations: 119
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 2016 Citations: 79
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 2013 Citations: 55
Tensile behaviour of hybrid polymer composites–an experimental study R Girimurugan, N Senniangiri, B Pitchia Krishnan, DS Kavitha, M Vairavel IOP Conference Series: Materials Science and Engineering 1059 (1), 012033 , 2021 2021 Citations: 34
Ultrasonic spot-welding of AA 6061-T6 aluminium alloy: Optimization of process parameters, microstructural characteristics and mechanical properties of spot joints P Rajalingam, S Rajakumar, S Kavitha, T Sonar International Journal of Lightweight Materials and Manufacture 7 (1), 25-36 , 2024 2024 Citations: 32
A comparative study on resistance spot and laser beam spot welding of ultra-high strength steel for automotive applications P Rajalingam, S Rajakumar, T Sonar, S Kavitha International Journal of Lightweight Materials and Manufacture 7 (5), 648-661 , 2024 2024 Citations: 30
A process of interpreting the performance of friction stir welding on two dissimilar materials R Jayaraman, R Girimurugan, T Sankaramoorthy, R Subbiah, S Kavitha ADVANCES IN MANUFACTURING TECHNOLOGIES AND APPLICATION OF ARTIFICIAL … , 2023 2023 Citations: 25
Tensile shear fracture load bearing capability, softening of HAZ and microstructural characteristics of resistance spot welded DP-1000 steel joints P Rajalingam, S Rajakumar, V Balasubramanian, T Sonar, S Kavitha Materials Testing 65 (1), 94-110 , 2023 2023 Citations: 25
Enhancing the Properties of Ti6Al4Vas a Biomedical Material: A Review VE Annamalai, S Kavitha, SA Ramji Open Materials Science Journal 8, 1-17 , 2014 2014 Citations: 21
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 2017 Citations: 20
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 2021 Citations: 16
Comprehensive assessment of combining ability and heterosis for the development of superior three-line hybrids in rice (Oryza sativa L.) R Nivedha, S Manonmani, T Kalaimagal, M Raveendran, S Kavitha Electronic Journal of Plant Breeding 15 (1), 31-41 , 2024 2024 Citations: 14
Optimization of laser beam spot welding (LBSW) parameters to maximize the load bearing capability of AHS-DP1000 steel lap joints P Rajalingam, S Rajakumar, V Balasubramanian, T Sonar, S Kavitha International Journal on Interactive Design and Manufacturing (IJIDeM) 17 (6 … , 2023 2023 Citations: 11
Analyzing the mechanical and thermal property of hybrid natural fibers through reinforced polylactic acid composites JS Babu, R Girimurugan, N Prabhu, S Kavitha, L Girisha ADVANCES IN MANUFACTURING TECHNOLOGIES AND APPLICATION OF ARTIFICIAL … , 2023 2023 Citations: 10
Experimental studies on key-hole plasma arc welding process parameters of AISI 304 HCu stainless steel tube joints PG Sam Infant Jones, S Rajakumar, S Kavitha, V Balasubramanian Welding International 36 (11), 655-667 , 2022 2022 Citations: 10
Identification of anaerobic germination tolerant landraces and validation of molecular marker in rice (Oryza sativa L.). G Mohanapriya, S Kavitha, V Thiruvengadam, M Raveendran, ... Electronic Journal of Plant Breeding 13 (3) , 2022 2022 Citations: 10
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 2020 Citations: 9
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 2012 Citations: 9
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 2012 Citations: 9
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 2019 Citations: 8