Hitesh Sharma
@nituk.ac.in
Assistant Professor Mechanical Engineering Department
NIT Uttarakhand
Scopus Publications
Scopus Publications
Sudhir Chaudhary, Sandeep Gairola, and Hitesh Sharma
SAGE Publications
In the present research endeavor, the waste shells of pistachio and walnut have been used in the form of fillers to develop hybrid flax epoxy composites. The effect of hybridization on the developed composites was studied in terms of thermal, mechanical, and morphological properties. The properties like tensile strength, tensile modulus, flexural strength, flexural modulus, impact strength, and shore hardness were evaluated to ascertain the mechanical behavior. The thermogravimetric analysis of the composites was also performed in order to determine the thermal stability of the developed composites. The results revealed that pistachio shell filler-based flax/epoxy composites showed improved tensile strength and tensile modulus by over 73.26% and 42.53% in comparison to the control specimen. The walnut shell filler-based flax/epoxy composites also exhibited improved tensile strength and tensile modulus by 66.41% and 17.1% compared to the control specimen. Whereas, the hybrid filler-based flax/epoxy composites were found to be thermally more stable. The fractography of the developed composites was also studied using scanning electron microscope which revealed good filler distribution in the epoxy matrix.
Hitesh Sharma, Inderdeep Singh, and Joy Prakash Misra
SAGE Publications
The current research work is aimed to study the potential of citrus limetta peel (fruit waste) as a novel filler in thermoplastic composites. Three different sizes of citrus limetta peel (CLP) fillers were processed and their thermal characteristics such as thermo-gravimetric analysis (TGA) and derivative thermogravimetry (DTG) were evaluated to investigate the degradation behaviour of each filler size under temperature. FTIR analysis of the CLP was also done to study the structure of inter- and intra-molecular hydrogen bonding in cellulose. The morphological study was also performed on both the outer surface as well as the inner surface of CLP in order to examine the surface characteristics. Based on the thermal characteristics of CLP filler, CLP-filled thermoplastic (poly-lactic acid) composite samples (by 20% weight percentage) were successfully fabricated using the injection moulding technique and were evaluated for their thermal, mechanical, and microstructural behaviour. It has been established that CLP fillers are amenable to processing using closed-mould processes such as injection moulding with fabricated products finding possible application in non-structural products, preferably in the particle board industry. As per the feasibility analysis, CLP fillers have the potential to be commercially exploited for product development.
Sandeep Gairola, Hitesh Sharma, and Inderdeep Singh
Springer Nature Singapore
Hitesh Sharma, Dushyant Singh, and Ashutosh Kumar Singh
ASME International
Abstract In the present work, large eddy simulation (LES) was performed to access the film cooling performance in the supersonic flow over a flat plate with a perpendicular slot injection configuration. The study was carried out for three mainstream Mach No.; Mα = 1.2, 2.67, and 3.3 and three coolant stream Mach No.: 0.05, 0.1, and 0.15. In supersonic flow, temperature rise inside the boundary layer is a major issue considering it causes high rates of heat transfer to the coolant film. To select a suitable LES sub-grid scale (SGS) model, LES results obtained from the present study using the LES SGS models such as Smagorinky-Lilly, wall adapted local eddy viscosity (WALE), and wall-modeled LES (WMLES) models were compared with DNS results of Keller and Kloker. The parametric study showed that the higher mainstream Mach No. caused increased wall temperature and reduced effectiveness. The film cooling effectiveness appeared to reduce almost by 10% when the mainstream Mach No. is increased from 1.2 to 2.67; however, no apparent difference was observed in effectiveness between the mainstream Mach No. 2.67 and 3.3. It was found that doubling and tripling the coolant stream Mach No. from 0.05 to 0.1 and 0.15, the length of potential core region also doubled and tripled, respectively, from 4 X/S to 8 X/S and 13 X/S and hence significant improvement in the film cooling effectiveness was observed.
Hitesh Sharma, Inderdeep Singh, and Joy Prakash Misra
SAGE Publications
The present study aims to investigate the influence of food waste (citrus limetta peel) filler size on the thermal and mechanical behaviour of epoxy resin based composites. The present research work was undertaken with three different categories of fillers i.e. (i) (100–250) µm and ii) (350–500) µm and iii) (650–800) µm in 15 wt.%. The epoxy resin modified with citrus limetta peel (CLP) fillers was exposed to water soaking for diverse time durations of 24 hrs, 48 hrs, 72 hrs, 96 hrs and 120 hrs. Mechanical and thermal properties of modified epoxy resin have been evaluated. A morphological analysis of the fractured surfaces of different composite specimens was also performed. The results revealed that the composites having coarse CLP fillers showed maximum water absorption. The mechanical characterization results revealed that the tensile and flexural strength were reduced in comparison to neat epoxy (NE). The impact strength of the developed composites increased for fine CLP fillers based composites. Overall, it was established that there is a significant effect of variation in filler size on developed composites and composites with fine CLP fillers gave best results compared to medium and coarse fillers based composites.
Hitesh Sharma, Dushyant Singh, and Ashutosh Kumar Singh
Springer Singapore
Sudhir Kumar Chaudhary, Hitesh Sharma, and Gaurav Kumar
Springer Singapore
Hitesh Sharma, Joy Prakash Misra, and Inderdeep Singh
Elsevier BV
Prajjwal Dhiman and Hitesh Sharma
Elsevier BV
Sandeep Gairola, Somit Gairola, and Hitesh Sharma
Springer Singapore
Hitesh Sharma, Inderdeep Singh, and Joy Prakash Misra
SAGE Publications
The present research venture focuses on utilization of food and agricultural waste Citrus limetta (musambi) peel by using it as a filler material to develop novel epoxy (EP) composites. Experimental investigation has been performed to analyse the influence of C limetta (musambi) peel particles (CLPP) on mechanical properties (tensile, flexural and impact strength) of the developed composites. Different loadings by weight percentages (0, 5, 10 and 15 wt%) of filler have been used to explain the variation in mechanical properties. Along with effect of different filler percentages, failure characteristics of the prepared samples have also been studied. The results indicate that higher CLPP content in EP matrix has a detrimental effect on mechanical properties of manufactured biocomposites. Thermal characterization was performed to analyse the degradation behaviour and the onset temperature. Morphological analysis of the fractured surfaces was also conducted with the help of a scanning electron microscope. The current experimental investigation has revealed that CLPP can be used as a potential filler for manufacturing biocomposites with applications in general purpose interior fitments in addition to various non-structural components.
Sandeep Gairola, Somit Gairola, Hitesh Sharma, and Pawan Kumar Rakesh
IOP Publishing
Abstract Natural filler/fiber based composites are material focusing on the use of natural reinforcement material for fabrication process. In present research two different composites are developed using (i) pine needle fiber and epoxy (ii) pistachio shell filler and epoxy. Impact strength of developed composites is studied which shows that with addition of pistachio shell filler and pine needle fibers in composites, there is increase in impact strength as compared to neat epoxy sample. In addition, hybrid composite with natural filler and pine needle fiber has shown the highest impact strength of 23.33 kJ/m2. Investigating samples further in different conditions (petrol, kerosene, water) for impact strength, research shows that there is substantial decrease in strength in comparison to the samples subjected to ambient conditions.
Hitesh Sharma, Ujendra Kumar Komal, Inderdeep Singh, Joy Prakash Misra, and Pawan Kumar Rakesh
Springer Singapore
Ujendra Kumar Komal, Hitesh Sharma, and Inderdeep Singh
Springer Singapore
Hitesh Sharma, Inderdeep Singh, and Joy Prakash Misra
Elsevier BV