NAGENDRA J
@newhorizonindia.edu
Associate professor
New Horizon College of Engineering
RESEARCH INTERESTS
Additive manufacturing, Topology and Process parameter optimization, Lean manufacturing, Design of Experiments, Quality and Reliability engineering
Scopus Publications
Scholar Citations
Scholar h-index
Scholar i10-index
Scopus Publications
J. Nagendra, Singavarapu Sujani, Manoj Kumar Vishkarma, Savita Bhati, Fouad A. Al-Saady, and Lovi Raj Gupta
EDP Sciences
In the realm of advanced materials, intermetallic matrix composites (IMC) have garnered significant attention due to their potential for high-temperature applications and superior mechanical properties. This research delves into the corrosion behaviour and electrochemical characteristics of selected IMCs to elucidate their performance in aggressive environments. Employing potentiodynamic polarization tests and electrochemical impedance spectroscopy (EIS) , the study provides a comprehensive analysis of the corrosion kinetics and mechanisms inherent to these materials. The results indicate that the microstructural features, including the distribution of secondary phases and the nature of the matrix, play a pivotal role in determining the corrosion resistance. Furthermore, the presence of certain alloying elements was found to impart passivation capabilities, thereby enhancing the overall corrosion resistance. The EIS data revealed distinct time constants, suggesting multiple electrochemical processes at the interface. This study not only advances our understanding of the corrosion behaviour of IMCs but also underscores the importance of microstructural engineering in tailoring their electrochemical properties. The insights garnered hold profound implications for the design and application of IMCs in industries where corrosion resistance is paramount.
M. K. Srinath, J. Nagendra, M. Ravikumar, K. D. Bopanna, S. Sujith Swamy, and C. Rakesh
Springer Science and Business Media LLC
J. Nagendra, M. K. Srinath, G. Shaikshavali, C. Labesh Kumar, Din Bandhu, Praveena Bindiganavile Anand, Santhosh Nagaraja, and Ashish Saxena
Springer Science and Business Media LLC
Nagendra J, G. Praveen Kumar Yadav, R. Srinivas, Nakul Gupta, Din Bandhu, Ashish Fande, Kuldeep K. Saxena, Faramarz Djavanroodi, S. Saadaoui, Amjad Iqbal,et al.
Informa UK Limited
G. Praveen Kumar Yadav, Yagya Dutta Dwivedi, M. Lava Kumar, Pankaj Sonia, Din Bandhu, Nagendra J, and Mayada Ahmed Abass
Springer Science and Business Media LLC
J. Nagendra, M.K. Srinath, K.D. Bopanna, S. Sujeeth Swamy, and M. Ravikumar
Elsevier BV
K.D. Bopanna, M.K. Srinath, M. Ravikumar, Sujeeth Swami, and J. Nagendra
Elsevier BV
M.K. Srinath, J. Nagendra, K.D. Bopanna, S. Sujeeth Swamy, and M. Ravikumar
Elsevier BV
M.K. Srinath, H.V. Puneeth, J. Nagendra, and M.S. Ganesha Prasad
Elsevier BV
M. K. Srinath and J. Nagendra
Springer Science and Business Media LLC
J. Nagendra, M.K. Srinath, S. Sujeeth, K.S. Naresh, and M.S. Ganesha Prasad
Elsevier BV
Abstract Additive Manufacturing (AM) is a latest technology of manufacturing of products by layer over layer deposition. Fused Deposition Modelling (FDM) is a widely used technique amongst the AM technology due its easier operating commands hassle-free pre-processing and post-processing stages. The current investigation is focused on the FDM uses of thermoplastic as the feed material, consisting of polymer composite consisting Nylon and Aramid, which is introduced as a filament. FDM process parameters are optimized to obtain the best quality surface finish by minimizing the surface roughness. Layer thickness, print temperature, raster angle, infill pattern style and infill part density are the influencing parameters considered in this investigation. The values of these factors were taken at three levels each and the interactions between these factors were investigated for the surface finish of FDM built part. Taguchi Design of experiment was used to find the optimum factor levels, significant factors, and interactions. The results from Taguchi method showed the layer thickness of 0.2 mm, print temperature of 280 °C, raster angle of 90°, infill pattern style of tetrahedral and infill part density of 90% were optimal for improving the surface finish. The part printed for validation with optimized process parameters had resulted in the Ra value of 1.5470 µm, 2.145 µm and 1.212 µm, with an error of 1.65%, 2.10% and 1.80% at the top, side, and bottom faces, respectively. The combined objective error was achieved at 2.45%. The errors obtained is attributed to the hardware and/or the variations in the operating conditions. The study highlighted a simple but workable approach for predicting the surface roughness along various surface of FDM built parts.
M.K. Srinath, J. Nagendra, H.V. Puneeth, and M.S. Ganesha Prasad
Elsevier BV
Abstract Ceramic composite coatings of Titanium Carbide (TiC) and Chromium Oxide (Cr2O3) were applied on the surface of Al-6061, produced through High Velocity Oxy-Fuel (HVOF) technique. The combination of the coatings developed were TiC + 10%Cr2O3, were Cr2O3 acts as the reinforcement in TiC matrix and Cr2O3 + 10%TiC were TiC acts as the reinforcement in Cr2O3 matrix. The microstructural characterisation was conducted using the Scanning Electron Microscope (SEM) and X-Ray Diffraction (XRD). The SEM images showed better bonding of the TiC reinforcement to the Cr2O3 matrix and the XRD tests of the same showed the presence of of compounds of Chromium Oxide-Titanium Oxide in large quantities. The presence of these compounds indicates a clear bonding between the reinforcement and matrix of the coating. The physical properties of surface roughness and coating thickness were examined using the Surface Roughness Tester (SRT) and Coating Thickness Gauge (CTG) respectively. Coatings of Cr2O3 + 10%TiC were found to have consistent coating thickness and lower valleys and peaks. The Tribological wear evaluation was conducted using the Pin-on Disc wear tester according to the G99 ASTM standard. With the increasing axial load, it was observed that the wear reduced drastically for specimens coated with Cr2O3 + 10%TiC as compared to the specimens coated with TiC + 10%Cr2O3 and uncoated specimens. Thus, the micro-structural, physical and tribological properties analysed through the tests conducted showed that the combination of Cr2O3 + 10%TiC had superior properties in the tests conducted, as compared to TiC + 10%Cr2O3 coatings. This is mainly attributed to the adhesion abilities of the TiC reinforcement material to the Cr2O3 matrix of the ceramic composite coating. The research showed that the addition of Titanium Carbide reinforcement to the Chromium Oxide matrix in the coating enhanced the surface properties of Al-6061 to a large extent.
J. Nagendra and M. S. Ganesha Prasad
Springer Science and Business Media LLC
Fused deposition modelling (FDM) is one such technique of additive manufacturing (AM) that deposits the extruded thermoplastic material layer by layer to build the desired part. The study is focused on the introduction of new thermoplastic material that widens the application of FDM process and also to use the part for functional purpose rather than just the prototype. Nylon is used as the feed filament material for FDM due to its higher mechanical properties and wear resistant characteristics that are often used as sliding bearing. The properties of nylon are further enhanced by adding the aramid short fibres. In this investigation, the process parameter optimization of FDM process is performed by using Gray Taguchi technique for the quality and mechanical characteristics enhancement. Layer thickness, print temperature, raster angle, infill part density and infill pattern style were considered as the influencing factors for optimization. Mechanical properties including tensile strength, flexural strength, impact strength and compression strength (responses) were studied for the designed experiments which were conducted according to ASTM standards. Analysis of variance was performed using Minitab 18 software to understand the signal-to-noise ratio for the respective objective. The overall combined objective is framed by providing equal importance to all the four responses. From the analysis, the following factors were identified as the optimum settings, layer thickness of 0.4 mm, print temperature of 300 °C, infill part density of 90%, raster angle of 90° and infill pattern style of rectilinear. The results from the test sample printed at the determined optimum setting has exhibited tensile strength of 51.455 MPa, flexural strength as 98.164 MPa impact strength of 0.637 MJ/sq m, compressive strength as 19.42 MPa. The test result of the parts printed from pure nylon as per the prescribed standard setting exhibited tensile strength of 48 MPa, flexural strength as 80.5 MPa, impact strength as 0.51 MJ/sq m and compression strength as 18.12 MPa. A significant increase by 7.2% in tensile strength, 22.7% in flexural strength, 27.4% in impact strength and 7.5% in compressive strength were noticed. From the investigation, it was possible to conclude that even short fibre composites can also be used as FDM raw materials and valid predictions can be made using regression equations with very less error and is justified by experimental trails.
J. Nagendra, M. S. Ganesha Prasad, S. Shashank, N. Vijay, Syed Md. Ali, and Venkat Suresh
Author(s)