Sreethul Das
@vit.ac.in
Assistant Professor, Department of Manufacturing Engineering, School of Mechanical Engineering
Vellore Institute of Technology
RESEARCH INTERESTS
Manufacturing process, Machining, Non Traditional Machining, Failure Analysis of Engineering Components
Scopus Publications
Scopus Publications
Aditya Raj, Utkarsh Chadha, Arisha Chadha, R. Rishikesh Mahadevan, Buddhi Rohan Sai, Devanshi Chaudhary, Senthil Kumaran Selvaraj, R. Lokeshkumar, Sreethul Das, B. Karthikeyan,et al.
Springer Science and Business Media LLC
S S Vivek, B Karthikeyan, Senthil Kumaran Selvaraj, M Pradeep Kumar, Utkarsh Chadha, Sreethul Das, G Ranjani, R Rajasakthivel, K Tamilvendhan, and Tezeta Moges Adane
IOP Publishing
Abstract 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.
Sreethul Das, C. Pandivelan, M. S. S. Madhava Reddy, D. Kesava, and Y. A. V. Avinash
AIP Publishing
Sreethul Das, Lance Anil, and C Pandivelan
Elsevier BV
Ishwarjot Singh Oberoi, Priyvrat Rajkumar, and Sreethul Das
Elsevier BV
Abstract 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.
Mosam Ugemuge and Sreethul Das
SAE International
Sreethul Das and C Pandivelan
IOP Publishing
Mosam Ugemuge and Sreethul Das
SAE International
Utkarsh Dwivedi, Sidharth Tiwari, Asutosh Mishra, and Sreethul Das
Elsevier BV
Abstract Aluminium 7075 being the workhorse of the Aluminum series has a wide range of applications in industries like aerospace, automotive, transport, etc. due to its high strength to density ratio, light weight and good corrosion resistance. It has been observed that it is difficult to weld the 7075 alloy using Tungsten inert gas (TIG) welding metal inert gas (MIG) welding or any other conventional method as it encounters solidification and recrystallization problems like cracking and porosity which hamper the weld strength. Hence, in this paper we have attempted to weld the 7075 alloy using friction stir welding, a solid state welding process that does not involve the melting of the sample and hence avoids problems related to solidification of the weld. The weld strength of the same is tested by applying tensile test, hardness test and microstructure analysis. The aforementioned tests are applied on the 7075 alloy welded by autogenous TIG welding and the weld strength of the two welding methods is compared
Monica Subashini M, Sreethul Das, Soumil Heble, Utkarsh Raj, and R Karthik
Institute of Advanced Engineering and Science
<p>About 10% of the world’s workforce is directly dependent on agriculture for income and about 99% of food consumed by humans comes from farming. Agriculture is highly climate dependent and with global warming and rapidly changing weather it has become necessary to closely monitor the environment of growing crops for maximizing output as well as increasing food security while minimizing resource usage. In this study, we developed a low cost system which will monitor the temperature, humidity, light intensity and soil moisture of crops and send it to an online server for storage and analysis, based on this data the system can control actuators to control the growth parameters. The three tier system architecture consists of sensors and actuators on the lower level followed by an 8-bit AVR microcontroller which is used for data acquisition and processing topped by an ESP8266 Wi-Fi module which communicates with the internet server. The system uses relay to control actuators such as pumps to irrigate the fields; online weather data is used to optimize the irrigation cycles. The prototyped system was subject to several tests, the experimental results express the systems reliability and accuracy which accentuate its feasibility in real-world applications.</p>
Isheeka Dasgupta and Sreethul Das
IEEE
Petroleum coke, a byproduct of the oil refining process is used as a source of energy given its high carbon content. The high ignition temperature and low volatile matter of petcoke poses combustion problems in a FBC boiler. This is sought to be mitigated by cofiring of biomass with coke. Biomass blends of 15% and 30% by weight of rice straw by weight have been used in this study. This paper presents the initial findings of a thermogravimetric analysis (TGA) done on petroleum coke and rice straw blends to evaluate their combustion characteristics. It is observed that the ignition time and temperature has been lowered and the reactivity of petcoke has increased resulting in better combustion characteristics in the presence of rice straw. The boiler thermal efficiency has also improved due to cofiring