Mr. Mahalingam Nainaragaram Ramasamy
Faculty of Mechanical Engineering, VŠB-TUO, Ostrava, Moravskoslezský Kraj, Czech Republic
open for collaboration
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Academic Career Length
2Years (2025-Present)
(Calculated once Scilit publication data is synced: current year − year of first publication + 1)
Representative Publications
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Journal Article
Mahalingam Nainaragaram Ramasamy
Aleš Slíva
Prasath Govindaraj
Akash NagThis research article outlines our aim to perform topology optimization (TO) by reducing the mass of the connecting rod of an internal combustion engine based on static structural and dynamic analyses. The basic components of an internal combustion engine like the connecting rods, pistons, crankshaft, and cylinder liners were designed using Autodesk Inventor Professional 2025. Using topology optimization, we aimed to achieve lesser maximum von Mises stress during static structural analysis and maintain a factor of safety (FOS) above 2.5 during rigid body dynamics. A force of 64,500 N was applied at the small end of the connecting rod while the big end was fixed. Topology optimization was carried out using ANSYS Discovery software at various percentages on a trial-and-error basis to determine better topology with lesser maximum von Mises stress. Target reduction was set to 4%, and as a result, 5.66% mass reduction from the original design and 6.25% reduced maximum von Mises stress was achieved. Later, transient analysis was carried out to evaluate the irregular motion loads and moments acting on the connecting rod at 1000 rpm. The results showed that the FOS remained above 2.5. Finally, the optimized connecting rod was simulated and verified for longevity using Goodman fatigue life analysis.
Journal Article
Mahalingam Nainaragaram RamasamyAleš SlívaAkash NagQMQuoc-Phu Ma
Quoc-Phu MaOHOndřej Hilšer
Ondřej Hilšer
Ján Dižo +3
Material-extrusion (MEX) printing with automated filament switching enables single-build multi-material laminates, but interfaces between dissimilar polymers may govern failure. Here, monolithic PETG, monolithic PC–ABS, and an alternating PETG/PC–ABS laminate (COMP) with 0.2 mm laminae (4 mm total) were fabricated and benchmarked. Tensile behavior was measured using ISO 527-2 Type 1B specimens at 5 and 50 mm/min, complemented by three-point bending in horizontal/vertical orientations, unnotched Charpy impact (ISO 179), Shore D hardness (ISO 868), and SEM fractography. COMP delivered the highest horizontal flexural strength (159.82 ± 25.42 MPa), exceeding both single-material baselines, indicating improved bending load capacity in the preferred orientation. In Charpy impact, COMP absorbed more energy than PETG in the horizontal condition (0.86 ± 0.14 J vs. 0.57 ± 0.06 J) but remained below PC–ABS. In tension, COMP strength decreased by ~21–23% relative to PETG and by ~5–6% relative to PC–ABS at both speeds, consistent with interface-controlled damage. SEM revealed void-assisted crack initiation and interfacial debonding aligned with raster paths, highlighting interfacial strengthening and porosity reduction as key routes to improve tensile performance while retaining favorable flexural and impact response.
Journal Article
JKJana Karásková
Jana KaráskováAleš SlívaMahalingam Nainaragaram RamasamyIOIvana Olivková
Ivana OlivkováPBPetr Besta
Petr BestaJán DižoHigh-precision calibration of inertial measurement units for automotive safety systems combines fixed automated chamber cycles with semi-manual loading, alignment, and transfer. Motion waste and ergonomic constraints can therefore dominate throughput and cycle time stability. This study redesigns a production calibration workstation using time-and-motion analysis, operator observation, and structured root-cause analysis based on the Ishikawa diagram and the five whys. Three interventions were implemented and validated with pre- and post-measurements: bundled handling that consolidates full-set transfers and reduces non-value-adding motions; a fixture and material handling redesign with a manual lifting aid to reduce physical load and enable reliable single-operator operation; and a modular workstation layout that supports the phased addition of chambers. Total cycle time decreased from 4475 s to 1230 s, a 72 percent reduction, and weekly output rose from 800 to 4500 units without additional staffing or significant automation investment. Overall equipment efficiency improved from 75.3 percent to 85.2 percent, while the quality rate remained at 98.8 percent.
Journal Article
Jude EmeleAleš SlívaMahalingam Nainaragaram RamasamyMFMartin Fusek
Martin FusekPBPetr Besta
Petr BestaJán DižoThis study reviews and experimentally investigates critical logistics and transport models in stainless-steel (SS) fluid storage tanks, focusing on stainless steel grades 316 and 304L. Conceptual vessel schematics emphasize hygienic drainability, refill uniformity, and thermal control, supported by representative 316L properties for heat-transfer, stress, and fluid–structure analyses. At the logistics scale, modelling integrates component-level simulations, computational fluid dynamics (CFD), and Finite Element Method (FEM) with network-level approaches, such as Continuous Approximation, to address facility location, refilling schedules, and demand variability. Experimental characterization using EDS and XRF confirmed the expected Cr/Ni backbone and grade-consistent Mo in 316, while unexpected C, Mn, and Cu readings were attributed to instrumental limits or statistical variance. Unexpected detection of Europium in 304L highlights the need for further mechanical testing. Overall, combining simulation, logistics modelling, and compositional verification offers a coherent framework for safe, efficient, and thermally reliable stainless-steel tank design.
Journal Article
Jude EmeleAleš SlívaMahalingam Nainaragaram RamasamySBSilvie Brožová
Silvie BrožováJán DižoThis study establishes an integrated qualification workflow combining mechanical testing, microstructural characterization, and statistically defined eddy current testing (ECT) on the same material heats to provide a coherent and traceable material qualification methodology. Forged 316 and rolled 304L were fully annealed and subsequently subjected to a 700 °C/1 h low-temperature stress-relief (recovery) treatment. Room-temperature tensile testing and Charpy impact testing at room and cryogenic temperatures were performed alongside optical and electron microscopy to quantify grain size, δ-ferrite content, and representative fracture morphology under the investigated conditions. ECT responses were evaluated using a statistically defined threshold (T = μ + 3σ) as a decision criterion for indication screening under assumed noise conditions and calibrated near-surface inspection sensitivity. The tested specimens showed stable measured mechanical responses, the examined fracture surfaces were consistent with predominantly ductile fracture behavior, and no reportable ECT indications were observed above the adopted threshold. The proposed framework provides a reproducible and scalable strategy for reducing uncertainty in material qualification and strengthening integration between destructive and non-destructive evaluation in stainless steel applications.
4 June 2026 in Discover Materials
Journal Article
Mahalingam Nainaragaram RamasamyASAles Sliva
Ales Sliva
SSSubramaniam Sankar
Subramaniam SankarSKStanislav Kovar
Stanislav Kovar
SGStanislav Gona
Stanislav Gona
About Me
My current research focuses on metamaterial design for electromagnetic interference (EMI) shielding. I conduct waveguide-based electromagnetic characterization across 1–18 GHz and use ANSYS HFSS to investigate scattering parameters, transmission and reflection, electromagnetic field distributions, and metamaterial performance.
My research interests include particle engineering, advanced materials, RVE/FEM modelling, additive manufacturing, electromagnetic characterization, EMI shielding, and metamaterials. I also have experience in patent and prior-art searches using Espacenet and Czech Industrial Property Office databases.
I welcome research collaborations in particle engineering, computational modelling, advanced materials, electromagnetic characterizationI am a researcher at the Particle Engineering Centre, Institute of Transport, Faculty of Mechanical Engineering, VŠB–Technical University of Ostrava, Czechia. My research combines particle characterization, computational modelling, material analysis, and electromagnetic engineering.
I have experience in particle-size, shape, and morphological analysis using laser diffraction and dynamic image analysis, including Mie and Fraunhofer scattering methods and rheological measurements. My computational work includes Representative Volume Element (RVE) modelling and finite element analysis using ANSYS, including transient simulations.
My current research focuses on metamaterials for electromagnetic interference (EMI) shielding