http://nopr.niscpr.res.in/handle/123456789/68614 Sat, 10 Oct 2026 19:05:59 GMT 2026-10-10T19:05:59Z http://nopr.niscpr.res.in/handle/123456789/68625 Title: Estimation of measurement uncertainty of 3-D metal printed specimen of H13 tool steel fabricated via metal fused filament fabrication process using 3D scanner Authors: Jain, Vandana; Kumar, Harish; Moona, Girija Abstract: This work has presented dimensional characterization and a “Guide to the Expression of Uncertainty in Measurement” (GUM) compliant measurement uncertainty evaluation of metal parts fabricated by metal fused filament fabrication process (M-FFF). A high-resolution handheld optical 3D scanner has been used for dimensional measurement of the printed specimens. Four different geometries have been printed from H13 tool steel, washed, sintered, and then digitally inspected to investigate dimensional deviations and further quantify the reliability of scanner-based metrology. Each specimen has been scanned three times, and dimensional deviation analyses have been conducted by means of CAD-to-scan comparisons using Artec Studio 19. Systematic deviations based on printing-induced shrinkage, surface topology, and scanning conditions have been revealed, and measured deviations across all samples have ranged from –0.999 mm to +0.989 mm. Measurement uncertainty has been estimated via both Type A (repeatability) and Type B (instrument and environmental factors) contributions. The following factors have been considered for Type B uncertainty evaluation: scanner point accuracy, resolution, alignment error, thermal expansion, and distance-dependent error. Repeatability and alignment/registration error have been identified as the main uncertainty contribution factors. The combined standard uncertainty has resulted in 122.7 μm, with an expanded uncertainty of approximately ±0.247 mm at k=2.015, 95% confidence level. It has been concluded that the presented and validated uncertainty budget offers a realistic tolerance band for industrial qualification of MFFF components, while enhancing the reliability of non-contact optical metrology. The findings have allowed a robust framework to be established for metrology-driven process validation, quality assurance, and industrial adoption of MFFF, which caters for very diverse applications, ranging from aerospace, automotive, and tooling to medical devices, part repairing, complex part dimension measurement and defense manufacturing. Page(s): 259-268 Mon, 01 Jun 2026 00:00:00 GMT http://nopr.niscpr.res.in/handle/123456789/68625 2026-06-01T00:00:00Z http://nopr.niscpr.res.in/handle/123456789/68624 Title: A novel hybrid design approach for elevated circular water tanks and parametric optimization Authors: Saxena, Sukanya; Kant Pathak, Krishna Abstract: This research has introduced hybrid elevated circular water tanks and has outlined the associated design methodology and guidelines. A detailed parametric study has also been conducted on hybrid elevated circular water tanks (HWTs) with capacities ranging from 100 kL to 300 kL to determine the optimum design parameters for cost-effective and structurally efficient construction. The study has investigated the influence of varying height-to-diameter (H/D) ratios and the number of supporting columns on tank cost and feasibility. Results have indicated that an H/D ratio of approximately 0.8 provides the best balance between structural integrity and economic efficiency. Optimal column configurations have been found to be 4 columns for 100 kL, 6 columns for 150–200 kL, and 8 columns for 250–300 kL tanks. Analysis of higher capacities (400–600 kL) has revealed practical limitations due to increased height or excessive column requirements, suggesting the preference for Intze tanks for larger volumes. The study has established critical design guidelines for Hybrid Circular tanks, ensuring cost-effective construction while maintaining structural stability. Page(s): 269-278 Mon, 01 Jun 2026 00:00:00 GMT http://nopr.niscpr.res.in/handle/123456789/68624 2026-06-01T00:00:00Z http://nopr.niscpr.res.in/handle/123456789/68623 Title: Effect of molybdenum-based precursors on the morphological evolution of MoTe2 nanostructures prepared by a one-pot synthesis method Authors: Kumar Yadav, Vinay; Singh Mehata, Mohan Abstract: In this work, molybdenum ditelluride (MoTe2) nanostructures have been synthesized using a hydrothermal route with different precursors and investigated for their morphological, structural and optical properties. Field-emission scanning electron microscopic images have revealed different morphological growth patterns, including nanorods, agglomerated nanoparticles and stacked sheet/flake-like structures, demonstrating significant influence of precursors and temperature on morphology. High-resolution transmission electron microscopy further confirmed the polycrystalline nature of the synthesized MoTe₂ nanostructures. X-ray diffraction patterns have confirmed the existence of 1T and 2H phases of MoTe2, depending on the selection of molybdenum precursors. The average crystallite size, calculated using the Williamson-Hall plot to be 144, 91, 57 and 41 nm for NAMo-1, NAMo-2, NHMo-1 and NHMo-2, samples respectively. The active Ag and B2g modes have been confirmed by Raman spectra and characteristic Mo-Te and Mo-O vibration modes by Fouriertransform infrared spectra, further confirmed the formation of MoTe2 nanostructures. The precursor-dependent morphology has provided insights into the synthesis of phase-tunable nanostructures. Page(s): 279-286 Mon, 01 Jun 2026 00:00:00 GMT http://nopr.niscpr.res.in/handle/123456789/68623 2026-06-01T00:00:00Z http://nopr.niscpr.res.in/handle/123456789/68622 Title: Development of leather waste composite sheets as a sustainable material for upholstery applications Authors: Chengamchetty Murali, Rajesh; Raman Murugan, Akshaya; Kumar Duraisamy, Suresh; Jeevanandham, Sadhanandham; Krishnaraj, Kaliappa Abstract: The paper has focused on developing leather waste composites by pulverizing leather dust and manufacturing scraps and mixing them with additives such as polyurethane (PU) and silicone-based polymers to produce sustainable upholstery materials. The composites, particularly the 80/20 PU/leather blend, have exhibited superior mechanical properties, including a tensile strength of 3.0595 N/mm², which has significantly outperformed conventional materials. The composites have demonstrated reduced water absorption, stable electrical properties, and improved fire resistance, with a limited oxygen index (LOI) of 24 and a delayed ignition time of 8 seconds. This innovative approach has addressed practical requirements for upholstery applications while also supporting environmental sustainability by promoting a circular economy and contributing to carbon reduction in the aviation industry Page(s): 287-297 Mon, 01 Jun 2026 00:00:00 GMT http://nopr.niscpr.res.in/handle/123456789/68622 2026-06-01T00:00:00Z