Sreethul Das

@vit.ac.in

Assistant Professor, Department of Manufacturing Engineering, School of Mechanical Engineering
Vellore Institute of Technology

Sreethul Das


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https://researchid.co/sreethuldas

RESEARCH INTERESTS

Manufacturing process, Machining, Non Traditional Machining, Failure Analysis of Engineering Components
16

Scopus Publications

Scopus Publications

  • Effect of ultrasonic vibration-assisted micromachining on the surface properties of difficult-to-machine materials
    P. Jeyapandiarajan, J. Joel, S. Arulvel, E. Venkatesaperumal, D. Vignesh, Sreethul Das
    Advanced Machining and Micromachining Processes, 2025
    Miniaturization of components in the modern manufacturing scenario necessitates machining of complex features on advanced materials. Machining hard materials with conventional methods like turning, milling, and grinding can be challenging due to high cutting forces, temperatures, tool wear, and poor surface quality. In order to address these challenges, a frequency vibration is introduced in the machining process to improve the surface properties of the material. Ultrasonic vibration-assisted micromachining (UVAMM) is a technique that involves transmitting of high frequency vibration to the cutting tool or workpiece to enhance the machining performance. The tool-workpiece contact become a fluctuating process that allows chip separation and minimize cutting force, while machining difficult-to-cut materials such as titanium, nickel alloys, ceramics, and composites. This chapter discusses UVAMM technology and highlights the applications, capabilities, and limitations of UVAMM on difficult to cut materials.
  • An Experimental Investigation into the Enhancement of Surface Quality of Inconel 718 Through Axial Ultrasonic Vibration-Assisted Grinding in Dry and MQL Environments
    Sreethul Das, Pandivelan Chinnaiyan, Joel Jayaseelan, Jeyapandiarajan Paulchamy, Andre Batako, Ashwath Pazhani
    Journal of Manufacturing and Materials Processing, 2024
    Ultrasonic vibration-assisted grinding (UVAG) has proven to be beneficial for grinding difficult-to-machine materials. This work attempts to enhance the grinding performance of Inconel 718 through a comprehensive study of UVAG characteristics. Grinding experiments were performed in both dry and Minimum Quantity Lubrication (MQL) environments, and assessment of the grinding forces, specific energy, residual stress, and surface topography was done. A substantial reduction of both surface roughness and grinding force components was observed in UVAG compared to conventional grinding (CG). Utilizing UVAG with MQL at the maximum vibration amplitude led to a 64% reduction in tangential grinding force and a 51% decrease in roughness parameter, Ra, when compared to CG conducted in a dry environment. The high-frequency indentations of the abrasives in UVAG generated compressive residual stresses on the ground surface. Surface parameters pointed to uniform texture and SEM images showed widening of abrasive grain tracks on the workpiece surface during UVAG. The utilization of UVAG under MQL produced a synergistic impact and resulted in the lowest grinding forces, specific energy, and optimal surface quality among all the grinding conditions investigated. Overall analysis of the results indicated that the axial configuration of the vibration set-up is favorable for UVAG, and the high-frequency periodic separation-cutting characteristic of the process improves lubricating efficiency and grinding performance.
  • Weld quality monitoring via machine learning-enabled approaches
    Aditya Raj, Utkarsh Chadha, Arisha Chadha, R. Rishikesh Mahadevan, Buddhi Rohan Sai, Devanshi Chaudhary, Senthil Kumaran Selvaraj, R. Lokeshkumar, Sreethul Das, B. Karthikeyan, R. Nagalakshmi, Vishjit Chandramohan, Haitham Hadidi
    International Journal on Interactive Design and Manufacturing, 2023
  • A comprehensive study on physico-mechanical properties of non-metallic fibre reinforced SCC blended with metakaolin and alcofine
    S S Vivek, B Karthikeyan, Senthil Kumaran Selvaraj, M Pradeep Kumar, Utkarsh Chadha, Sreethul Das, G Ranjani, R Rajasakthivel, K Tamilvendhan, Tezeta Moges Adane
    Materials Research Express, 2022
    This study presents a detailed experimental investigation on the effects incorporating non-metallic fibers in hybrid form in self-compacting concrete (SCC). In this regard SCC was prepared with Alccofine and Metakaolin as partial replacement for cement in 15% and 20% respectively along with the hybrid fibre combinations namely abaca fibres (0.25%, 0.5% & 0.75%), polypropylene fibres (0.5%, 1%, 1.5% & 2%) and glass fibres (0.5%, 1%, 1.5%, & 2%). The fresh properties of SCC with and without hybrid fibre combinations were assessed through the standard tests such as slump flow, J ring and V-funnel tests. The conventional mechanical tests such as compressive strength test, split tensile strength test and flexural strength test were performed at 7 and 28 days. The experimental results reveal that the fresh properties of SCC were highly influenced by alccofine and Metakaolin adopted in this research. Furthermore, that the hybrid combination of abaca with polypropylene and glass fibres improved the mechanical properties of SCC and in particular the mix with 1% glass fibre and 0.25% Abaca fibre had shown better flexural and tensile strength behaviour. Microstructure analyses were also done to confirm the improvement in mechanical properties. The Scanning Electron Microscope images of the mix with 1% glass fibre and 0.25% abaca fibre showed less voids presence and presence of more hydrated components conveying that the usage of hybrid fibres had restricted the propagation of cracks there by reducing the percentage of voids and the use of metakaolin and alcofine helping in forming hydrated components at earlier stage leading to better strength.
  • Optimisation of ultrasonic assisted grinding of inconel 718 using grey relational analysis
    Sreethul Das, C. Pandivelan, M. S. S. Madhava Reddy, D. Kesava, Y. A. V. Avinash
    Aip Conference Proceedings, 2021
    Nickel-based alloys like Inconel 718 occupy a large share in the aerospace industry because of superior mechanical properties. However, Inconel 718 is categorized as a difficult to machine material. Ultrasonic assisted grinding (UAG), a hybrid grinding process has captured the attention of researchers for grinding of Inconel 718 due its inherent capability in overcoming several problems associated with processing difficult to grind (DTG) materials. Lubrication machining is used for hard to machine materials and minimum quantity lubrication (MQL) is a sustainable method employed to overcome machining problems in such materials. In this context, this work aims to examine UAG of Inconel 718 under different lubrication conditions. Optimization of UAG is necessary in identifying the best parameter combination depending on the process capability of a given machine tool. For this, experimentation using Taguchi L18 orthogonal array parameter design and optimization based on Grey Relational Analysis (GRA) have been performed. The optimization has been performed using grinding forces (tangential force, Ft) and average roughness parameter (Ra) as the output parameters. Additionally, regression models have been developed to enable the prediction of response variables. To determine the factor contribution on output response ANOVA table and S N ratio analysis have been performed on the Grey Relational Grade (GRG). The statistical analysis has revealed feed has the maximum impact on Ra and cutting velocity has the least effect. Similarly, for Ft depth of cut has the maximum effect and cutting velocity has minimum effect. Confirmation experiments reveal that the regression models were able to make accurate predictions under the test conditions.
  • Design and development of an ultrasonic stack assembly for ultrasonic vibration assisted grinding
    Sreethul Das, Lance Anil, C Pandivelan
    Materials Today Proceedings, 2021
  • Disposal and recycling of plastics
    Ishwarjot Singh Oberoi, Priyvrat Rajkumar, Sreethul Das
    Materials Today Proceedings, 2021
    Considering the shortage of raw material for plastics manufacturing and 1 the environmental pollution thus caused by them, recycling of FRP waste is very important. Plastic materials are being increasingly used as properties possessed by plastics have led to a sustainable development of plastic industry. The industries are now manufacturing a broad range of items including Bottles, panels, sheets, piping, molded planks, structural profiles. Still, despite these affirmative properties of plastics, the developers have faced a number of resistance in the regaining and reprocessing of plastics, for resource utilization and waste depletion. The examination evaluated the procedures that would affect the assembling and reusing organizations to recoup and reuse Plastic solid squanders. The outcomes have a practical and environmental effect for plastics assembling and reusing organizations just as for the waste administration area.
  • Topology optimisation of brake caliper
    Mosam Ugemuge, Sreethul Das
    SAE Technical Papers, 2020
    <div class="section abstract"><div class="htmlview paragraph">The objective of the research is to develop a lightweight yet stiff, 2 piston fixed brake caliper which can be used in formula student race car. To make a race car, its components need to be lighter. To stop a car with minimum stopping distance, it needs to have a sophisticated braking system with well-designed components. The designing of the caliper is carried out on the Altair Inspire software. The topology optimisation algorithm is used to minimise the weight of the caliper without compromising the stiffness. The structural analysis is also carried out on the Altair Inspire. The caliper is also tested for fatigue failure using Ansys.</div></div>
  • Grinding characteristics during ultrasonic vibration assisted grinding of alumina ceramic in selected dry and MQL conditions
    Sreethul Das, C Pandivelan
    Materials Research Express, 2020
    Abstract Ultrasonic vibration assisted grinding (UAG) has proven to lower the forces and improve the ground surface quality while shaping difficult to grind materials such as ceramics. A systematic study of UAG of alumina ceramic using a metal bonded diamond grinding wheel has been performed here. Taguchi’s L18 array based experimentation has been performed to study the effect of UAG parameters. During UAG, the vibration amplitudes of 6 and 12 microns have been used and the frequency has been kept at 20 kHz. From these experiments, optimum parameters for UAG have been identified using Grey relational analysis. Mathematical models generated using regression analysis have been found to correlate the experimental data with good accuracy. A comparison of the grinding forces and roughness of the surfaces generated in dry and minimum quantity lubrication (MQL) conditions in both conventional grinding and optimal condition in UAG has been performed to identify the beneficial effects of providing vibration to the workpiece. The surface quality has been evaluated using 3D roughness data, 3D plots and SEM images of the ground surface. By examining nature of the ground surface and kurtosis (S ku ) values of the surface profile, it has been concluded that UAG reduces brittle fracture and facilitates material removal by ductile mode for alumina. The desired condition of least machining forces and highest surface quality has been achieved during the combination of UAG and MQL.
  • Design and Testing of Custom Brake Caliper of a Formula Student Race Car
    Mosam Ugemuge, Sreethul Das
    SAE Technical Papers, 2019
    <div class="section abstract"><div class="htmlview paragraph">A Formula Student race car is a car designed and manufactured for speed, performance, and competition. For a car to have high speed and performance, their parts also need to be lighter with being able to sustain the dynamically occurring stresses. Effective braking is a crucial factor which determines the performance of the car. This paper focuses on designing a brake caliper on the basis of calculations done with respect to a Formula Student race car, selecting a material which is of low density but with higher strength which can be easily manufactured with low cost and analyzing the design. Further, the manufactured part is also tested statically to ensure proper working before being tested on an actual formula student race car. The caliper is again tested dynamically, where the caliper is mounted on rear wheels of the car. To ensure proper working, brake pressure sensors are being mounted which also helps to validate the calculations. The computer-aided design model is created in Solidworks 2017 and is analyzed for the factor of safety, stress, and deformation is ANSYS workbench 16.2.</div></div>
  • Comparative Study of Weld Characteristics of Friction Stir Welded Joints on Aluminium 7075 with Autogenous TIG
    Utkarsh Dwivedi, Sidharth Tiwari, Asutosh Mishra, Sreethul Das
    Materials Today Proceedings, 2019
  • Internet of things based wireless plant sensor for smart farming
    Monica Subashini M, Sreethul Das, Soumil Heble, Utkarsh Raj, R Karthik
    Indonesian Journal of Electrical Engineering and Computer Science, 2018
  • Theoretical investigation on the effect of nanofluids on heat transfer characteristics in a heat pipe
    International Journal of Mechanical Engineering and Technology, 2018
  • Evaluation of combustion performance of petroleum coke/rice straw blends for cofiring in a FBC boiler
    Isheeka Dasgupta, Sreethul Das
    IEEE Region 10 Annual International Conference Proceedings TENCON, 2017
  • Fem modelling of human eye for investigating the thermal effects of tumor on the ocular surface temperature
    Arpn Journal of Engineering and Applied Sciences, 2017
  • A low cost, home care smart stethoscope for diagnosis of respiratory diseases and heart rate measurement
    International Journal of Mechanical Engineering and Technology, 2017