Effect of electrospinning and carbonization on dielectric and charge transport properties of PAN–TiO2–CNT composite nanofibers Bijulin Greety D J, G Jims John Wessley, K Anton Savio Lewise Journal of Composite Materials, 2026 This study examines how processing methods influence the dielectric relaxation and charge transport behavior of composite nanofibrous materials. Composite films were fabricated using solution casting and electrospinning, followed by controlled carbonization under identical filler loading conditions to systematically evaluate the effect of structural evolution on electrical performance. Electrospinning generated a well-defined interconnected nanofibrous architecture with a high interfacial area, which significantly enhanced interfacial polarization. As a result, the electrospun samples exhibited high low-frequency dielectric permittivity (ε′ ≈ 10 3 –10 4 at 1 in the low-frequency regime (0.1–100 Hz)) and pronounced non-Debye relaxation behavior. Subsequent carbonization transformed the polymer matrix into a distorted carbonaceous framework, promoting the formation of an efficient conductive network. This structural transition shifted the dominant mechanism from polarization-governed relaxation to transport-controlled conduction, leading to an electrical conductivity of approximately 9.5 S m −1 . Electric modulus analysis and impedance-based equivalent circuit modeling revealed a progressive reduction in bulk resistance from 10 7 Ω for cast films to 10 2 –10 3 Ω after carbonization. Weibull statistical analysis further indicated improved dielectric reliability, with characteristic breakdown strengths reaching 180 MV m −1 . The results demonstrate that electrospinning combined with post-carbonization offers an effective processing strategy for tailoring dielectric relaxation and charge transport properties in composite nanofibrous systems, making them promising candidates for advanced functional applications.
Investigation on Mechanical and Microstructural Analysis of Friction Stir Welded Aluminium Reinforced with Zinc Powder V.S. Akash, J. Edwin Raja Dhas, K. Anton Savio Lewise, G. Ramanan International Journal of Vehicle Structures and Systems, 2025 Many researchers use a variety of methods to study Friction Stir Welding (FSW). Heat required for joining is obtained from the rotary action of the weld tool and the pieces to be joined. This results in the softening of the region near the weld tool. The quality of the weld is a matter of concern. It depends on the adjustment and control of the weld process parameters. Hence, proper knowledge is essential and required to monitor and effectively tune the weld parameters for a sound weld. In this work, investigations are done to explore the microstructural and mechanical properties of friction stir-welded Aluminium plates reinforced with Zinc. Pressure was applied to the Aluminium 7020 pieces through a CNC machine to create a friction stir effect. The mechanical test result justifies the higher value of tensile strength of 90.370 N/mm² and the hardness value of 40HRV. The quality of the weld is characterised by mechanical and microstructural properties. Observations show that this technique can be preferably used in shipbuilding and aerospace applications.
Study on the influence of FSSW process parameters on tensile strength of dissimilar materials joint (AA2014/AA7075) K Eqbert, K Anton Savio Lewise, N Jeyaprakash, Ibrahim A Alnaser, Sundara Subramanian Karuppasamy Physica Scripta, 2025 Friction Stir Spot Welding (FSSW) belongs to the category of solid-state welding process and is most suitable for joining lightweight materials. For obtaining highly efficient spot welds with good structural integrity, there is a need to optimize the process parameters involved in the FSSW process. This work is aimed at optimizing the process parameters for the spot welds fabricated in the AA2014-AA7075 alloy via the FSSW process. With the aid of Box-Behnken design, the sequence of experimental trials was performed at three levels along with the results obtained from the ANOVA methodology. The empirical modeling was established via Response Surface Methodology (RSM) and compared with the experimental trials. Results showed that the tool rotating speed serves as the most influential parameter followed by the tool shoulder diameter, plunge depth and dwell time. With the effect of response, contour and desirability plots, the optimal process parametric values were found and these values were correlated with the 7th experimental trial which was based on the maximum tensile strength offered by the spot weld. Further, the optical micrograph captured at the weld zone of the 7th trial specimen was rich in equiaxed grains with intermetallic phases. This grain refinement and intermetallic phases contributed to a higher hardness of the spot welds and thus offering maximum tensile strength with good structural integrity.
Effect of electrospinning and carbonization on dielectric and charge transport properties of PAN-TiO 2 -CNT composite nanofibers DJ Greety, G Wessley, J John, K Anton Savio Lewise JOURNAL OF COMPOSITE MATERIALS , 2026 2026
Effect of electrospinning and carbonization on dielectric and charge transport properties of PAN–TiO 2 –CNT composite nanofibers BG DJ, GJJ Wessley, K Anton Savio Lewise Journal of Composite Materials, 00219983261449158 , 2026 2026
Advances in aircraft aerodynamic analysis: a review of experimental, computational, and hybrid techniques: J. Anish et al. J Anish, GMJ Herbert, KAS Lewise International Journal of Dynamics and Control 14 (2), 65 , 2026 2026
Mechanical and Microstructural Property Characterization of Hybrid Aluminum AA8011/B 4 C/rGO Composites: Michael, Dhas, and Lewise A Michael, JER Dhas, KAS Lewise JOM 78 (1), 621-639 , 2026 2026
A review of aerodynamic systems in micro air vehicles J Anish, KAS Lewise, R Darshan International Journal of Aeronautical and Space Sciences 27 (1), 264-286 , 2026 2026 Citations: 2
Comparative Study of Oil Residues as Brake Pad Materials: Evaluating Mechanical Characteristics and Environmental Sustainability: Hemanth, Dhas, and Lewise MSK Hemanth, JER Dhas, KAS Lewise JOM 77 (8), 6121-6138 , 2025 2025 Citations: 1
Study on the influence of FSSW process parameters on tensile strength of dissimilar materials joint (AA2014/AA7075) K Eqbert, KAS Lewise, N Jeyaprakash, IA Alnaser, SS Karuppasamy Physica Scripta 100 (6), 065933 , 2025 2025 Citations: 1
Comprehensive Analysis of Copper–Stainless Steel 304 Dissimilar Joints Using Electron Beam Welding AR Rajendran, SJ Vijay, M Dev Anand, K Anton Savio Lewise, RSR Isaac Physics of Metals and Metallography 126 (4), 447-460 , 2025 2025 Citations: 1
Investigation on Mechanical and Microstructural Analysis of Friction Stir Welded Aluminium Reinforced with Zinc Powder VS Akash, JER Dhas, KAS Lewise, G Ramanan International Journal of Vehicle Structures & Systems 17 (5), 796-799 , 2025 2025
Performance analysis of FFNN and Kriging model on prediction of ionospheric TEC during April 2022–X 1.1 solar flare R Mukesh, SC Dass, M Vijay, G Ramanan, KAS Lewise, AV Anand International Journal of Ambient Energy 45 (1), 2304726 , 2024 2024
Development and Testing of Al 2024/SiC/Ti/Nb Multi-metal Alloy for Fuselage Panels DS Pasala, MJI Raj, KAS Lewise, R Benmoses International Conference on Sustainable Technologies and Advances in … , 2024 2024
A review on 2-D supersonic aerofoil shape optimization P Vijayaparkavan, KAS Lewise, RA Raj Computational Mathematics and Mathematical Physics 64 (11), 2559-2570 , 2024 2024 Citations: 2
Surface Roughness Prediction using Swarm Fuzzy SVR Technique VS Akash, J Edwin Raja Dhas, K Anton Savio Lewise, CP Jesuthanam Journal of Physics: Conference Series 2837 (1), 012082 , 2024 2024 Citations: 3
Quantitative phase analysis of electron beam weldments of copper and stainless steel 304 using XRD and SEM-EDX AR Rajendran, SJ Vijay, DA Manoharan, KAS Lewise, R Isaac Asia-Pacific Journal of Science and Technology 29 (05) , 2024 2024
14 Challenges and D Al Joints, KAS Lewise, JER Dhas, M Satheesh Friction Stir Spot Welding: Metallurgical, Mechanical and Tribological … , 2024 2024
10 Mechanical Properties S Boopathi, KAS Lewise, JER Dhas, M Satheesh Friction Stir Spot Welding: Metallurgical, Mechanical and Tribological … , 2024 2024
Mechanical properties and temperature distribution of friction stir spot welding process S Boopathi, KAS Lewise, JER Dhas, M Satheesh Friction Stir Spot Welding, 164-187 , 2024 2024 Citations: 2
Challenges and Application of Friction Stir Spot Welding of Dissimilar Al Joints KAS Lewise, JER Dhas, M Satheesh Friction Stir Spot Welding, 241-257 , 2024 2024
Friction stir spot welding: metallurgical, mechanical and tribological properties J Natarajan, KAS Lewise CRC Press , 2024 2024 Citations: 3
Parametric optimization of friction stir welding of ZE42 using NSGA-II AK Darwins, KAS Lewise, M Fahad, M Satheesh, JER Dhas, AV Anand International Journal on Interactive Design and Manufacturing (IJIDeM) 18 (5 … , 2024 2024 Citations: 10
MOST CITED SCHOLAR PUBLICATIONS
FSSW process parameter optimization for AA2024 and AA7075 alloy K Anton Savio Lewise, J Edwin Raja Dhas Materials and Manufacturing Processes 37 (1), 34-42 , 2022 2022 Citations: 43
Influences of Friction stir tool parameters for joining two similar AZ61A alloy plates V Haribalaji, S Boopathi, MM Asif, M Jeyakumar, R Subbiah, KAS Lewise Materials Today: Proceedings 50, 2547-2553 , 2022 2022 Citations: 38
Influence of nanoparticles in reinforced aluminium metal matrix composites in aerospace applications–A review J Qadir, AS Lewise, GJJ Wessley, GD Samuel Materials Today: Proceedings , 2023 2023 Citations: 33
Near-dry wire-cut electrical discharge machining process using water–air-mist dielectric fluid: an experimental study S Boopathi, KAS Lewise, R Subbiah, G Sivaraman Materials Today: Proceedings 49, 1885-1890 , 2022 2022 Citations: 33
Mechanical properties analysis of kenaf–grewia–hair fiber-reinforced composite S Boopathi, G Venkatesan, K Anton Savio Lewise Recent Advances in Mechanical Engineering: Select Proceedings of ICRAMERD … , 2022 2022 Citations: 29
Manufacturing and experimental characterization of new-developed natural fiber reinforced polymer Nanocomposite ER Dhas J, AS Lewise K, NK Kulandaiyappan, V Raja, CA Saleel, ... journal of materials research and technology 26, 6084-6095 , 2023 2023 Citations: 25
Challenges on friction stir welding of magnesium alloys in automotives MA Unnikrishnan, JER Dhas, KAS Lewise, JC Varghese, M Ganesh Materials Today: Proceedings , 2023 2023 Citations: 24
Optimizing FSW process parameters using RSM and regression analysis for similar and dissimilar aluminium materials S Suhin, SR Divahar, JER Dhas, KAS Lewise, MS Gupta Materials Today: Proceedings 64, 368-373 , 2022 2022 Citations: 19
Influences of Mg-Cr filler materials in Friction Stir Process of Aluminium-based dissimilar alloys V Haribalaji, S Boopathi, MM Asif, T Yuvaraj, D Velmurugan, KAS Lewise, ... Materials Today: Proceedings 66, 948-954 , 2022 2022 Citations: 19
Effect of fly ash on metal matrix composites–An overview R Ramesh, N Elangovan, KAS Lewise, R Anandan, S Sathish, ... Materials Today: Proceedings 50, 1315-1318 , 2022 2022 Citations: 19
Investigations on chemical behaviours on mechanical properties of natural fiber composites: an evaluation S Stevens, JER Dhas, KAS Lewise, A Mohammad, M Fahad Materials Today: Proceedings 64 (410-415), 410-415 , 2022 2022 Citations: 17
Wear behavior analysis of aluminium composites using Taguchi approach J Kirubakaran, SR Divahar, JER Dhas, KAS Lewise, AV Anand Materials Today: Proceedings 64, 345-351 , 2022 2022 Citations: 17
Preparation and characterization of Silk/Bamboo/Glass nano polymer composites S Subash, BSJ Retnam, JJ Happy, JER Dhas, KAS Lewise, M Ganesh Materials Today: Proceedings 64, 298-301 , 2022 2022 Citations: 16
Fabrication and wear characterization of stir cast AA7075-TiCp reinforced composite G Ramanan, JER Dhas, RRN Rajan, KAS Lewise, S Vishnu Materials Today: Proceedings 52, 1216-1222 , 2022 2022 Citations: 15
Metallurgical and mechanical investigation on FSSWed dissimilar aluminum alloy KAS Lewise, JER Dhas, R Pandiyarajan, S Sabarish Journal of Alloys and Metallurgical Systems 2, 100010 , 2023 2023 Citations: 13
Effect of coconut shell nanopowder reinforcement in the development of palm fiber composites JE Raja Dhas, KA Savio Lewise, KN Kumar, V Raja, HAZ AL-bonsrulah, ... Frontiers in Materials 9, 986011 , 2022 2022 Citations: 13
Submerged arc welding process parameter prediction using predictive modeling techniques JER Dhas, KAS Lewise, G Laxmi Materials Today: Proceedings 64, 402-409 , 2022 2022 Citations: 13
Parametric optimization of friction stir welding of ZE42 using NSGA-II AK Darwins, KAS Lewise, M Fahad, M Satheesh, JER Dhas, AV Anand International Journal on Interactive Design and Manufacturing (IJIDeM) 18 (5 … , 2024 2024 Citations: 10
An overview on characteristics and performance of ultrasonic welding process on different materials NM Jasmin, KAS Lewise, D Raguraman, M Murugan, S Aditya, ... Materials Today: Proceedings 50, 1508-1510 , 2022 2022 Citations: 10
Recast Layer Thickness and Residual Stress Analysis for EDD AA8011/h-BN/B 4 C Composites Using Cryogenically Treated SiC and CFRP Powder-Added Kerosene J Vivek, T Maridurai, KAS Lewise, R Pandiyarajan, K Chandrasekaran Arabian Journal for Science and Engineering 47 (12), 15613-15632 , 2022 2022 Citations: 9
