Browsing by Author "Saminathan, R."

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    Effect of BTO piezoceramic on the mechanical and dielectric properties of 3D-printed PLA.BTO functional polymer composite
    (Springer Nature, 2025) Senthil Murugan, S.; Kattimani, S.; Saminathan, R.
    The development of polymer composite materials for additive manufacturing is critical for advancing industrial applications. This study enhances the functional performance of poly-lactic acid (PLA) by incorporating barium titanate (BTO/BaTiO?) particles. Uniform dispersion of BTO within the PLA matrix was achieved, and filaments were fabricated using fused deposition modelling (FDM) with a 60% infill rate, adhering to ASTM standards. The influence of BTO fillers on the mechanical and dielectric properties of PLA.BTO composites were analysed and compared to pure PLA. FESEM microstructural analysis confirmed distinct layering, defect-free deposition, and uniform BTO distribution. Mechanical testing revealed notable improvements, including increases in tensile strength (16.4%), flexural strength (17.1%), shore hardness (4.7%), impact strength (17.7%), and drop-weight energy absorption for a 5 mm plate (26%), attributed to enhanced interfacial bonding and reduced void formation. The dielectric properties exhibited significant enhancements, with a 12.9% increase in dielectric strength, a 15% higher dielectric constant, an 8% greater breakdown strength, and a 21.74% rise in electrical susceptibility. Furthermore, reductions in loss tangent (19.1%), AC conductivity (7.8%), and dielectric loss (6.8%) demonstrated the material’s ability to store and withstand electric fields efficiently. Ferroelectric analysis revealed improved remanence, coercivity, and polarization, underscoring the composite’s potential as a piezoelectric material. These findings highlight the suitability of PLA.BTO composites for energy storage devices, sensors, and biodegradable functional applications, offering a promising balance of mechanical durability and superior dielectric performance. © Qatar University and Springer Nature Switzerland AG 2025.
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    INVESTIGATION OF SINGLE-SIDED TIG WELDING IN DISSIMILAR AISI 316L AND 304L STAINLESS STEEL JOINTS
    (Galati University Press, 2025) Senthil Murugan, S.S.; Kattimani, S.; Saminathan, R.; John Iruthaya Raj, M.J.I.
    This study investigates the Tungsten Inert Gas (TIG) welding of dissimilar austenitic stainless steels, AISI 304L and AISI 316L, each with a thickness of 3.2 mm. A single-pass butt joint was welded using a 100 A current with argon shielding gas. The joints underwent mechanical testing, including tensile, bend, impact, and hardness tests. The tensile test revealed a 25% reduction in the weld joint strength compared to the base metal, primarily due to differences in thermal expansion and mechanical properties, resulting in an overall joint efficiency of 75%. Macro and microstructural analyses indicated good fusion without defects, and typical weld metal microstructures were observed. The heat-affected zone (HAZ) of AISI 304L showed larger grains, while AISI 316L exhibited a flaky structure. The hardness test indicated the highest value in the weld zone (191 HV), compared to the HAZ (177 HV) and the parent metal (170 HV), which can be attributed to grain refinement and the use of the SS304 filler rod. Impact tests demonstrated good impact resistance (45 J), with the HAZ exhibiting higher toughness compared to the parent metal. Bend tests revealed no cracks on the weld face, whereas cracks were observed in the root bend tests. The study demonstrated sufficient strength, toughness, and hardness in the dissimilar TIG joint for engineering applications, despite the reduced tensile strength compared to the base metals. © Galati University Press, 2025.