Squeeze film lubrication between a cylinder and a flat porous plate under the influence of magnetohydrodynamics, couple stress, and viscosity variation R. Suresha, B. N. Hanumagowda, R. Arunkumar, S. Raghavendra Multiscale and Multidisciplinary Modeling Experiments and Design, 2026 The research examines the effect of viscosity variation on squeeze film characteristics between a cylinder and a porous flat surface by considering the homogenous externally applied magnetic field and utilizing a couple stress fluid as a lubricant. Such configurations are critical in advanced engineering applications such as aerospace mechanisms, automotive components, and microelectromechanical systems (MEMS), which require reliable lubrication. The primary goal is to investigate how viscosity variation, magnetohydrodynamic (MHD) effects, porosity, and couple stress all affect squeeze film performance. A modified Reynolds-flow expression is obtained for specific boundary conditions. Then, mathematical expressions for pressure, load-carrying capability, and squeeze film time are determined. Systematically varying the parameter values, and computational analysis is utilized to visualize these relationships through graphs. The results reveal a substantial enhancement, with pressure, load-carrying capacity, and squeeze-film time increasing by up to 77.6% under optimal MHD, viscosity-variation, and couple-stress conditions, clearly demonstrating the quantitative benefits of the proposed model. In contrast, porosity is found to reduce performance. Neglecting viscosity and porosity effects brings the results in line with Sreekala et al., demonstrating excellent agreement through comparative analysis. Overall, this work addresses a key research gap by simultaneously integrating MHD, viscosity variation, porosity, and couple-stress effects—an interaction not thoroughly explored in previous studies. The study’s novelty lies in providing a unified analytical framework that clarifies how these parameters collectively influence lubrication performance, thereby establishing clear objectives for optimizing advanced fluid-film systems. The findings have significant implications for automotive engineering, aerospace applications, and MEMS technology, offering valuable insights for researchers and engineers in fluid mechanics and tribology seeking to develop efficient, high-performance lubrication designs.
Effect of Nickel Content on Tensile, Hardness Properties and Dry Sliding Wear Behaviour of Austempered Ductile Iron Raghavendra Subramanya, Rudrappa Arun Kumar, Manjunatha Kuntanahalli Narayanappa, Suresh Suraiah, Shivaramakrishna Aere Material and Mechanical Engineering Technology, 2026 The increasing interest in the development of austempered ductile cast irons has led to a great deal of study being done on their physical metallurgy and mechanical properties. The exceptional strength and hardness of these cast irons are well recognised. In this study, samples of permanent moulded toughened austempered ductile iron (PMADI) that are subjected to an austempering heat treatment are used to investigate the effects of nickel content on their tensile strength and hardness strength. PMADI samples were developed using Casting and samples with 1% nickel 2% Nickel content were prepared. The characteristics of PMADI samples were compared with those of samples that had been hardened and subjected to normal austempering heat treatment. Investigations were conducted on mechanical characteristics, such as tensile and hardness tests. ADI samples have shown higher levels of hardness and tensile strength. The findings showed that the mechanical characteristics of PMADI samples with 2.0% nickel were noticeably better. The scanning electron microscopy images revealed both ductile and brittle mode of fracture. Wear testing was conducted utilising a pin-on-disk machine in dry sliding method. Large quantities of austenite, which are produced at higher austempering temperatures, help to increase wear resistance through martensitic transformation. The coarse ausferrite structure in ADIs experiences adhesion, delamination, and mild abrasion in addition to oxidational wear, according to an analysis of worn surfaces and the kind of wear debris. An increase in mechanical strength seems to be correlated with an increase in retained austenite content.
Tribomechanical properties of developed aluminium hybrid composites reinforced with MWCNT, SiC, and coconut shell ash Smruti Rekha Swain, Raghavendra Subramanya, Prashant Hatti, Kalkunte Narasimha Murthy, Arunkumar Thirugnanasambandam Next Materials, 2025 The increasing interest in lightweight, low-cost, and eco-friendly materials has inspired the synthesis of aluminium hybrid composites (AHCs) for excellent corrosion resistance, high thermal and electrical conductivity-related applications. Low-cost sustainable AHCs were synthesized herein using double-stage stir casting, where multi-walled carbon nanotubes (MWCNTs) (0.3 wt%), silicon carbide (SiC) (0.3 wt%), and coconut shell ash (CSA) (1–8 wt%) were incorporated as reinforcements into an Al1050 alloy matrix. The novelty of this work is in reducing the use of costly reinforcements (MWCNT & SiC) and utilizing CSA as a green biomass, SiO₂-rich reinforcement to improve mechanical and tribological properties. The developed composites showed uniform reinforcement dispersion as validated by SEM. Tensile strength was raised by 45.6 % (from 98 MPa for AH0 to 143 MPa for AH6), compression strength was raised by 31.3 % (from 510 MPa to 670 MPa), and microhardness was raised by 22.5 % (from 31.5 HV to 38.6 HV). Wear resistance was greatly improved, with a decrease in wear loss by 64.7 % and a decrease in the coefficient of friction from 0.34 to 0.22. SEM morphology of wear SEM confirmed the shift from adhesive to minor abrasive wear, confirming reinforcement effectiveness. The considerable improvement in mechanical and tribological properties in the current study indicates that coconut shell ash (CSA) is a good and environmentally friendly reinforcement in aluminium hybrid composites and therefore can be a good low-cost substitute for traditional ceramic reinforcements for future engineering applications.
Effect of Variable Gravity and Internal Heat Source Strength on Marangoni-Benard Ferroconvection in a Saturated Porous Medium Kavyashree Kavyashree, Rudrappa Arunkumar, Subramanya Raghavendra, Bhaskar Chola, Mohammed Fareeduddin Journal of Advanced Research in Fluid Mechanics and Thermal Sciences, 2025 The effect of gravity modulation via internal heating on the onset of Marangoni-Bénard ferroconvection in MNFs in a saturated porous medium is investigated theoretically. The upper boundary, which is free, considered flat and undeformable, and the lower boundary is assumed to be rigid. Upper and lower boundaries are protected perfectly to temperature perturbations. The higher-order Galerkin approach is used to derive the crucial stability parameters quantitatively. It is inferred that the internal heat source strength and gravity modulation have considerable influence on the onset of ferroconvection in a saturated porous medium. The variable gravity coefficient δ shows the stabilizing as convection begins, whereas internal heat source strength Ns and nonlinearity of fluid magnetization have a destabilizing effect on the ferroconvection.
Glass carbon fibre-reinforced polymer composites for automobile applications Asian Textile Journal, 2025
Mechanical property characterization of carbon fibre, glass fibre, and hybrid composites: A focus on tensile strength, flexural behaviour, and hardness Man Made Textiles in India, 2025
AN OVERVIEW ON BIOCOMPATIBILITY AND FAILURE ANALYSIS OF ACRYLONITRILE BUTADIENE STERYENE BASED LARYNGOSCOPE Suranaree Journal of Science and Technology, 2023
Low-cost Battery Management System For E-vehicles T. V. V. Pavan Kumar, Moazzam Haidari, R. Vimala, Raghavendra Subramanya, Lakshminarayana. M, Hemavathi International Conference on Edge Computing and Applications Icecaa 2022 Proceedings, 2022
Squeeze film lubrication between a cylinder and a flat porous plate under the influence of magnetohydrodynamics, couple stress, and viscosity variation R Suresha, BN Hanumagowda, R Arunkumar, S Raghavendra Multiscale and Multidisciplinary Modeling, Experiments and Design 9 (1), 104 , 2026 2026 Citations: 1
Synthesis and mechanical characterization of epoxy bio-composites reinforced with Kigelia Africana (sausage) fruit fibers for biomedical applications A Ali, R Subramanya, A Razak, A Smerat, YD Jelila, AAH Kadhum Journal of Materials Science: Materials in Engineering , 2026 2026
Influence of Fe3O4 particles in Al7075 metal matrix composites: A Tribological study A Shivaramakrishna, S Raghavendra, Y Basavaraj, RA Kumar, MR Kumar, ... Superficies y Vacío 39, 260301-260301 , 2026 2026
Tensile strength and strain energy absorption in twist extruded Al 6061-B 4 Cp metal matrix composites B Manjunatha, R Subramanya, KG Satyanarayana, HB Niranjan Advances in Materials and Processing Technologies 11 (4), 2157-2178 , 2025 2025
Corrosion Resistance and Performance of Al2014-B 4 C Composites: A Comprehensive Study. S Prabha, S Raghavendra, S Suresha, A Chandrashekar, S Patil Journal of Mines, Metals & Fuels 73 (8) , 2025 2025
Tribomechanical properties of developed aluminium hybrid composites reinforced with MWCNT, SiC, and coconut shell ash AT Smruti Rekha Swain a, Raghavendra Subramanya b, Prashant Hatti c ... next materials 9 , 2025 2025 Citations: 2
Influence of fibre ratio and chemical treatment on the properties of hybrid epoxy composites reinforced with areca and banana fibre S Raghavendra, CS A, M KN, S S, M SV, AK R, P SS, D SN, SK KB, R RS Journal of the Indian Academy of Wood Science 22 (1), 218-226 , 2025 2025 Citations: 3
Pressure Distribution Analysis of Leaded Tin Bronze Hydrodynamic Journal Bearing under Different Lubrication Conditions S Arjun, R Ranganatha, NR Thyagaraj, S Raghavendra, T Girish, ... Journal of Bio-and Tribo-Corrosion 11 (2), 34 , 2025 2025 Citations: 2
Polyvinyl alcohol–sodium niobate–cellulose nanofiber composites: dielectric and electric study AS Gadtya, R Subramanya, S Moharana Iranian Polymer Journal 34 (5), 637-651 , 2025 2025
Influence of nanomagnesium oxide fillers on tensile and impact strength of banana fibre-reinforced epoxy composites S Raghavendra, RS Raveendra, GN Anil Kumar Polymer Bulletin 82 (6), 1825-1839 , 2025 2025 Citations: 3
Fabrication and Investigation of Characteristics of Al2014‑B4C Composites Using Liquid Metallurgy Technique SPSRVKS Patil J. Inst. Eng. India Ser. D , 2025 2025 Citations: 2
Analysis and Optimization of Textile-Reinforced Composites for Automotive Applications: Design, FEA & Validation RS G. C. Mekalke Journal of the Textile Association 85 (5), 563-570 , 2025 2025
A theoretical investigation of magnetohydrodynamics, couple stress and viscosity variation on squeeze film lubrication between a cylinder and rough porous flat surface S Ramareddy, A Rudrappa, BN Hanumagowda, S Raghavendra Archives of Thermodynamics, 141-156-141-156 , 2025 2025
Analysis and Optimization of Textile-Reinforced Composites for Automotive Applications: Design, FEA & Validation Journal of the Textile Association 85 , 2025 2025
A Theoretical Study on the Effects of Magnetohydrodynamics, Couple Stress, and Viscosity Variation on Squeeze Film Lubrication among a Cylinder and a Flat Surface MKKN Suresha Ramreddy1,*, Hanumagowda Bennihalli Naganagowda2, Arun Kumar ... Journal of Advanced Research in Fluid Mechanics and Thermal Sciences 132 (2) , 2025 2025
Enhancement of tensile strength and fracture toughness characteristics of banana fibre reinforced epoxy composites with nano MgO fillers S Raghavendra, RR Sannegowda, AK Rudrappa, SKK Basavarajaiah Next Materials 5, 100258 , 2024 2024 Citations: 24
Evaluation of microstructure and mechanical properties of aluminium (Al6061)-carbon nanotube (CNT)/coconut shell ash (CSA) composites PS Hatti, KN Murthy, S Raghavendra, SR Swain Interactions 245 (1), 89 , 2024 2024 Citations: 1
Optimization of Wear Behavior in Al-6061-B4C Composites Using Taguchi Technique and Response Surface Analysis B Manjunatha, HB Niranjan, S Raghavendra, KG Satyanarayana Current Innovations in Chemical and Materials Sciences Vol. 9, 11-31 , 2024 2024
Influence of Silicon Carbide and Graphite Reinforcements and T6 Aging Heat Treatment on the Fatigue Characteristics of AZ91D Magnesium Alloy APA Amalan, NM Sivaram, R Subramanya Journal of Materials Engineering and Performance 33 (6), 2751-2767 , 2024 2024 Citations: 2
Optimization of Wear Behavior in Al-6061- B4C Composites Using Taguchi Technique and Response Surface Analysis SRKGS B. Manjunatha , H. B. Niranjan Current Innovations in Chemical and Materials Sciences 9, Chapter 2 , 2024 2024
MOST CITED SCHOLAR PUBLICATIONS
Evaluation of structural, tensile and thermal properties of banana fibers R Subramanya, KG Satyanarayana, B Shetty Pilar Journal of Natural Fibers 14 (4), 485-497 , 2017 2017 Citations: 77
Mechanical Properties of Short Banana Fiber Reinforced Natural Rubber Composites. S Raghavendra, PB Shetty, PG Mukunda IJIRSET , 2013 2013 Citations: 77
Tensile, impact and fracture toughness properties of banana fibre-reinforced polymer composites R Subramanya, DNS Reddy, PS Sathyanarayana Advances in Materials and Processing Technologies 6 (4), 661-668 , 2020 2020 Citations: 53
High speed machining of titanium Ti 6Al4V alloy components: study and optimisation of cutting parameters using RSM S Raghavendra, PS Sathyanarayana, SK S, T Vs, M Kn Advances in Materials and Processing Technologies 8 (1), 277-290 , 2022 2022 Citations: 39
Evaluation of mechanical properties in date palm fronds polymer composites S Raghavendra, GN Lokesh AIP Conference Proceedings 2057 (1), 020021 , 2019 2019 Citations: 28
Wear behaviour of aluminium alloy 5083/SiC/fly ash inoculants based functional composites – optimization studies SRDB N Santhosh, B A Praveena, A Chandrashekar, V Mohanavel Materials Research Express, 9 , 2022 2022 Citations: 26
Enhancement of tensile strength and fracture toughness characteristics of banana fibre reinforced epoxy composites with nano MgO fillers S Raghavendra, RR Sannegowda, AK Rudrappa, SKK Basavarajaiah Next Materials 5, 100258 , 2024 2024 Citations: 24
The effect of fiber length on tensile properties of epoxy resin composites reinforced by the fibers of banana S Raghavendra, P Balachandrashetty, PG Mukunda, KG Sathyanarayana International Journal of Engineering Research & Technology 1 (6), 1-3 , 2012 2012 Citations: 24
The manufacture and characterisation of short banana fibre-reinforced polymer composites R Subramanya, P Sathyanarayana, M Kn, S Naik Advances in Materials and Processing Technologies 8 (1), 797-807 , 2022 2022 Citations: 19
Tribological characteristics of AL6061, Boron, and Graphite hybrid metal matrix composites SS Nagesh,Raghavendra S, Manjunatha B, Sivram NM Adv Mat Tech processing , 2021 2021 Citations: 18
Mechanical properties of hybrid composites with date palm fibre reinforcement S Raghavendra, NM Sivaram, T Sadik, SS Prabhakara advanced materials 8, 19 , 2018 2018 Citations: 15
Synthesis of Fe3O4–aluminium matrix composites: mechanical and corrosion characteristics A Shivaramakrishna, Y Basavaraj, R Subramanya Int. J. Cast. Met. Res. 35, 51-59 , 2022 2022 Citations: 10
Manufacturing and mechanical characterization of coir fibre composites based on vinyl ester A Raghavendra S, Seetha Girish, Vijaya B ADVANCES IN MATERIALS AND PROCESSING TECHNOLOGIES , 2021 2021 Citations: 10
Low-cost Battery Management System For E-vehicles TVVP Kumar, M Haidari, R Vimala, R Subramanya 2022 International Conference on Edge Computing and Applications (ICECAA … , 2022 2022 Citations: 9
Tensile hardness and wear properties of iron oxide (Fe3O4) reinforced aluminium 7075 metal matrix composites A Shivaramakrishna, S Raghavendra, B Yadavalli Adv Mater Process Technol 8 (4), 4598-4612 , 2022 2022 Citations: 8
‘Design of wind blades for the development of low-power wind turbines using Betz and Schmitz methods MM Raghavendra sa, Ravikumar trb, Gnaendra Reddy gvb ADVANCES IN MATERIALS AND PROCESSING TECHNOLOGIES , 2020 2020 Citations: 6
Surface Modification of Banana Fiber and its Influence on Performance of Biodegradable Banana-Cassava Starch Composites R subramanya Applied Mechanics and Materials 895, 15-20 , 2019 2019 Citations: 6
Mechanical properties of sisal fiber reinforced thermoplastic starch bio-composites VS Naik, PB Shetty, S Raghavendra Int J Mech Mater Sci Res 7, 1-7 , 2017 2017 Citations: 6
Evaluation of Mechanical Properties in Banana Fiber Reinforced Thermoplastic Polymer Composites. SS Karadi, I Belawadi, S Raghavendra, A Manjunath IJERT , 2015 2015 Citations: 6
An Experimental Investigation on Effect of B4C/CeO2 Reinforcements on Mechanical, Fracture Surface and Wear Characteristics in Al7075 Hybrid Metal Matrix Composites SS Ravikumar M*, Hanumanthe Gowda, Umesh G L, Raghavendra S, Darshan S M ... INTERNATIONAL JOURNAL OF INTEGRATED ENGINEERING 16 (5), 100-113 , 2024 2024 Citations: 5
