RAJESH M
@hindustanuniv.ac.in
Assistant Professor
Hindustan Institute of Technology and Science
COMPLETED pH.d
RESEARCH INTERESTS
Composites, Machining, Optimization
Scopus Publications
Scopus Publications
K. Gnanasekaran, M. Rajesh, and V. Hariram
Springer Science and Business Media LLC
KG Saravanan, S Gokulraj, M Rajesh, and S Ram Prakash
SAGE Publications
In recent years, the inclusion of biochar fillers in the polymer matrix has been used to enhance the mechanical, dielectric and dynamic properties of the composite. High-performance structural components are often made using polymer composites. This work focuses on the development of glass fibre interleaved almond biochar filler (ABC-5, 10 and 15%) reinforced polymer composites through a hand layup process. The machinability of the composite was then investigated in abrasive water jet machining by considering the biochar filler quantity, water pressure (WP), traverse speed (TS) and standoff distance (SOD). The kerf angle (KA) and surface roughness (SR) were used to assess the machining performance. The addition of a biochar filler in the composite increases the SR and KA quality. The machining performance of the biochar-filled composite is better when there is an increase in water pressure and a decrease in SOD and TS. Analysis of Variance (ANOVA) reveals that the ABC% significantly influence the SR and KA trialed by JP. The combination of WP 200 MPa with ABC10% composite laminate results in decreased values of KA (1.09o) and SR (2.754 µm). The ideal parameters for achieving lower SR and KA are TS of 20 mm/min, 3 mm of SOD, 200 bar of WP and 10% biochar composite in combination. Moreover, scanning electron microscopic (SEM) images ensure the smoothness of the surface texture at high water pressure (WP) with 10% almond biochar composite laminate, cutting and finishing are smooth. The biochar fillers reinforced in hybrid composites exhibited good surface quality, free of pullouts and fibre delamination.
Prem Padmaraja, Rabin Sasi, Ram Prakash Shanmugasundaram, Rajesh Munusamy, and Selvakumar Gurusamy
MDPI
M. SANTHANAKUMAR, R. VIJAYAKUMAR, R. ADALARASAN, and M. RAJESH
World Scientific Pub Co Pte Ltd
This work investigates the piercing of microholes in turbine shroud rings (Inconel-625) using the Abrasive Waterjet Cutting process. The concern with the hole piercing is the kerf angle caused by the attenuation of the jet energy and stand-off distance, which seriously impacts the processing precision of abrasive water jet piercing. The effects of piercing parameters like machining time (40, 60 and 80[Formula: see text]s), abrasive mesh size (80 mesh and 120 mesh), stand-off distance (1, 2, 3 and 4[Formula: see text]mm), abrasive jet pressure (100, 125, 150 and 175[Formula: see text]MPa) are studied to reduce the kerf angle. The kerf angle increased linearly with a stand-off distance increase at different machining times. By piercing for 60[Formula: see text]s and 80[Formula: see text]s, the lowest values of kerf angle are obtained (0.03∘ and 0.02∘). The optimum conditions for making a pierced hole with a minimum kerf angle of 0.02∘ were achieved with a machining time- of 60[Formula: see text]s, abrasive mesh size- of 20 mesh, and abrasive jet pressure- of Scanning electron microscope (SEM) images and visual measuring system (VMS) images are used to identify the surface characteristics in kerf zone. The features, including ploughing, particle embedment, lip impression and wear path due to the ductile mode of erosion caused by high energy impact, is also discussed.
Elangovan Kasi, Senthilkumar Ramasamy, Ramraji Kirubakaran, Rajesh Munusamy, Esakkiraj Esakki Sudalaimani, and Arunkumar Karuppasamy
Informa UK Limited
Ramraji Kirubakaran, Rajkumar Kaliyamoorthy, Rajesh Munusamy, and Bhaskar Annamalai
Wiley
AbstractIn fiber metal laminates (FMLs), the order in which fibers with different natural properties are stacked is very important for making materials that absorb vibrations and have good mechanical properties for structural applications. Hence, the present study focuses on the mechanical and vibration characteristics of FML designed with multi‐order energy‐absorbing flax fiber and high‐strength basalt fiber stacking covered with titanium sheets. The fabricated FMLs were designed with titanium/basalt fiber laminate (Ti/B), titanium/flax fiber laminate (Ti/F) and titanium/multi‐order‐flax‐basalt fiber laminate. The mechanical characteristics including tensile, flexural, and impact strength; and vibration characteristics of prepared FMLs were investigated. The higher tensile and flexural strength were revealed in an FML consisting of basalt layers (Ti/B) laminate than the flax core part (Ti/F) due to the strongness of basalt fiber, increasing the capability of load‐bearing of composites. Ti/B FML showed a maximum tensile strength and flexural strength of 412 and 450 MPa. Furthermore, flax fiber absorbs more energy, so the flax layer's inbuilt structure increases energy absorption during impact and vibration testing. Ti/F exhibits the highest impact strength (427.8 kJ/m2) and Ti/B exhibits the lowest impact strength (312.5 kJ/m2) because flax fibers are more ductile than basalt fibers, increasing the toughness of the FML. Ti/F FML structure, the greatest natural frequency of modes 1, 2, and 3 (549.03, 715.07, and 956.15 Hz) was observed. Natural fiber hybridization designed for FML, such as the Ti/B/F laminate, improved mechanical and vibration properties, making it suitable for structural applications.Highlights Fiber metal laminates were designed with titanium/flax/basalt. FMLs stacked composites significantly affect the mechanical properties. The basalt fiber, increases the capability of load‐bearing of FMLs. The damping of FMLs increases with the increase in flax fiber layers. Flax‐basalt fibers stacked FMLs produce tunable impact and vibration energy.
R. Vijayakumar, N. Srirangarajalu, M. Santhanakumar, N.E. Edwin Paul, and M. Rajesh
Elsevier BV
K. Ramraji, K. Arunkumar, R. Senthilkumar, M. Rajesh, and A. John Presin Kumar
Springer Science and Business Media LLC
P. Sarmaji Kumar, M. Rajesh, K. Ramraji, and R. Vijayakumar
Springer Nature Singapore
K. Ramraji, K. Rajkumar, M. Rajesh, and R. Vijayakumar
Springer Nature Singapore
S. Balamurugan, K. Jayakumar, B. Anbarasan, and M. Rajesh
Elsevier BV
Munusamy Rajesh, Rajkumar Kaliyamoorthy, and Ramraji Kirubakaran
SAGE Publications
High-strength environment-friendly metal-fiber laminates (MFLs) are increasingly used for primary structures for various engineering applications. The surface roughness variation and delamination factor of a titanium (Ti) metal-cored basalt/flax fiber laminate were investigated during abrasive water jet drilling (AWJD). The present AWJD investigation is to establish the correlation of four important process independent variables of WJP—water jet pressure, TS—traverse speed, QMFR—abrasive mass flow rate, and SOD—stand-off distance to the delamination factor (Fd-top) and surface roughness (Ra) of drilled hole. Central composite design (CCD) of L29 orthogonal array was used to perform the experimental observations. The statistical approach (ANOVA) was employed to determine the contribution of individual AWJD parameters to drilling operation. It is identified from experimental results that the water jet pressure is the most predominant process parameter and its contribution on Fd-top and Ra were 74.28% and 72.48%, respectively. Increasing the water pressure from low (160 MPa) to its higher range (320 MPa) showed that the surface roughness and delamination factor were reduced irrespective of other drilling parameters. Increased water pressure provides enough kinetic energy for abrasive particles to facilitate a higher penetration potential during the drilling process. Scanning Electron Microscope (SEM) images show the machining-induced damages like ploughing marks, uncut fibers, ridges, craters, matrix smearing, and delamination on an abrasive water jet drilled surface of prepared MFL.
M. Rajesh, K. Rajkumar, R. Vijayakumar, and K. Ramraji
Elsevier BV
Ramraji Kirubakaran, Kaliyamoorthy Rajkumar, and Munusamy Rajesh
Informa UK Limited
ABSTRACT The structural porosity weakness of a natural flax fiber-layered polymer laminate was reduced by the spatial rearrangement of natural almond shell filler occupying preferentially porous sites between the stacking layers, improving the properties of the polymer laminate. The present work investigates the mechanical, thermal, and free vibrational behavior of composites, including surface modification and the effect of almond shell filler loading in the flax fiber intertwined composites. Alkaline treatment of natural flax fiber and almond shell filler effectively reduced the hydrophilic contents of hemicellulose, lignin, and wax without altering the cellulose nature, as confirmed by FTIR analysis. Tensile strength was 35% higher for the alkaline-treated 10% almond shell-filled composite than the untreated filler composite. However, the tensile strength decreased beyond 10% of filler loading because of the poor dispersion of fillers in the matrix. As evident in the 10% filled almond shell composite, due to stronger interaction, polymer-mixed almond fillers act as a thermal insulating layer between the flax stacks, increasing thermal stability. Alkali treatment with an almond shell of 10 wt% filled flax fiber composite exhibited a higher natural frequency (185 Hz) and damping value (0.042) due to total internal dissipation of dynamic forces.
M. Rajesh, R. Vijayakumar, K. Rajkumar, and K. Ramraji
Elsevier BV
K. Rajkumar, M. Rishiram, K. Ramraji, and M. Rajesh
Elsevier BV
N. Srirangarajalu, R. Vijayakumar, and M. Rajesh
Informa UK Limited
ABSTRACT Inconel-625 is a tough-to-cutting material used in ultra-supercritical power plants for flanges, offshore oil sectors, and turbine blades, among other high-temperature components. The objective of this article is to determine the link between four key process independent variables: traverse speed (TSP), abrasive mass flow rate (AMFR), abrasive aqua jet pressure (AAJP), and gap distance (Gd) to the surface roughness (SRa), kerf angle (KEA), and erosion rate (MRR). The response surface methodology-Central composite design (RSM-CCD) was used to perform the experimental interpretations. The influence of individual abrasive aqua jet cutting (AAJC) factors was determined using analysis of variance technique (ANOVA). It was found that AAJP is the dominant factor in the responses. When the AAJP reached its maximum value of 300 MPa, the SRa and KEA reduced by 27.19% and 13.83%, respectively, the MRR improved by 23.71%. The Desirability analysis is handled to optimize the AAJC parameters of Inconel-625. The optimal values of parameters obtained were 300 MPa AAJP, 75 mm/min TSP, 2.4 mm Gd, and 0.55 kg/min AMFR to minimize SRa, KEA, & maximize the MRR. The scanning electron microscope is used to examine the surface morphology and erosion mechanisms.
M. Rajesh, K. Rajkumar, and V. E Annamalai
Informa UK Limited
ABSTRACT Machining of high strength and shock-absorbent Metal Fiber Laminate (MFL) becomes inevitable to attain the geometric shape and size, as to validate the functionality in various impact protection environments. A class of titanium metal laminate alternatively interleaved with high strength basalt and shock absorbing flax fibers have been machined with an abrasive water jet method. Machining experiment trials with WJP-water jet pressure, TS-traverse speed, SOD-stand-off distance, and AMFR-abrasive flow rate and parametric optimization on quality factors of surface roughness (Ra) and kerf ratio (KR) were done using a Central Composite Design (CCD)-Response Surface Methodology (RSM). Experimental investigation reveals that the surface roughness and kerf ratio significantly decreased by 27.59% and 9.16% as water jet pressure was increased to peak value. Similarly, abrasive mass flow rate raised to its higher value, the Ra and KR slightly decreased by a margin of 6.5% and 2.5%. However, a reverse effect on surface roughness and kerf ratio was observed as an increase of SOD and TS. Surface topology analysis reveals that the material removal mechanism of the Ti sheet is shear plastic deformation with plowing marks, that of basalt fiber is brittle fracture with micro-chipping, and that of flax fiber is bulk machining.
K. Ramraji, K. Rajkumar, M. Rajesh, and A. Gnanavelbabu
Springer Singapore
K. Rajkumar, K. Ramraji, M. Rajesh, and M. Rajiv kumar
Springer Singapore
K. Rajkumar, M. Rajesh, K. Ramraji, P. Sabarinathan, and A. Gnanavelbabu
Springer Singapore