Akash Nag

Wire-fed directed energy deposition of metals: From melt-pool physics to defect control, mechanical performance and process monitoring

Shreyas Shivashankar, Akash Nag, Jiří Hajnyš, Jana Petrů et autres

Directed Energy Deposition (DED) is increasingly used for the fabrication and repair of large, high-value metallic components where conventional manufacturing and powder-bed additive manufacturing are limited by material waste, build volume or deposition rate. Among DED routes, wire-fed systems offer high material …

Comparative investigation of tensile, instrumented Charpy impact, and EPFM-based dynamic fracture toughness behavior of similar and dissimilar AA6061-T6/ZE41 friction stir welded joints

Ambuj Saxena, Ashish Kumar Srivastava, Vishal Shankar Srivastava, Sergej Hloch et autres

Microstructural characterization and surface integrity of additively manufactured Inconel 718 alloy

Preeti Gautam, Akash Nag, Jiří Hajnyš, Tomáš Čegan et autres

Selective laser melting is increasingly used to produce Inconel 718 components for aerospace, energy, tooling, and other demanding engineering applications. In these fields, material efficiency, component reliability, and long service life are closely linked to more sustainable manufacturing. However, the practical application …

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Stress amplification in a topology-optimized maraging steel 300 connecting rod due to as-built SLM deviations: a case study

Mahalingam Nainaragaram Ramasamy, Aleš Slíva, Prasath Govindaraj, Akash Nag

Abstract This study investigates how as-built dimensional deviations in a topology-optimized connecting rod manufactured by selective laser melting (SLM) affect structural response. A maraging steel 300 connecting rod was fabricated on a Renishaw 500 S Flex system and digitized using a low-cost …

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Influence of traverse trajectory overlapping of pulsating water jet on surface homogeneity and topography

Gabriel Stolárik, Jakub Poloprudský, Alice Chlupová, Dagmar Klichová et autres

UltrasonicQuery Pulsating Water Jet (PWJ) technology is studied for its potential to utilize the impact pressure (hammer effect) of individual droplets for surface modification and texturing. Although promising results have recently been achieved, indicating the potential use of impact pressure for controlled …

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Characterization of PC-ABS and PETG Multi-Material Laminates Fabricated by MEX Method

Mahalingam Nainaragaram Ramasamy, Aleš Slíva, Akash Nag, Quoc-Phu Ma et autres

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 …

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Integrated RSM and micromechanical RVE–FEA approach for optimizing indentation behavior of HEA-reinforced AA7075 alloy fabricated via friction stir processing

Ambuj Saxena, Ashish Kumar Srivastava, Deepak Kumar, Rahul Chaurasia et autres

Abstract In the present investigation, the response surface methodology (RSM), namely, the Box–Behnken design in conjunction with finite element analysis (FEA) was utilized to optimize the microindentation response of AA7075 alloy matrix reinforced by AlCoCrFeNiMn high-entropy alloy (HEA) particulates fabricated by the …

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Audio monitoring of bone cement disintegration in pulsating fluid jet surgery under laboratory conditions

Melanie Schaller, Sergej Hloch, Akash Nag, Dagmar Klichová et autres

• Demonstrated the time-reducing and bone damage-reducing effects of pulsating fluid jet technology when utilized for bone cement removal. • Demonstrated the efficacy of an in-house designed long nozzle, that is designed for minimally invasive surgical procedures. • Introduced the first application …

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