Qualification: 
Ph.D, M.Tech, B-Tech
c_santosh@blr.amrita.edu
Phone: 
9853925084

Dr. Santosh Kumar Sahu currently serves as Assistant Professor at the Department of Mechanical Engineering, School of Engineering, Amrita Vishwa Vidyapeetham, Bengaluru.

Dr. Santosh Kumar Sahu received his B.Tech from BPUT, Odisha and M.Tech from NIT Kurukshetra, Haryana in 2010 and 2014 respectively. He obtained his Ph.D. from North Eastern Regional Institute of Science & Technology (A CFTI) in 2020. He has 7 numbers of international journals, 3 book chapters and 7 conference proceedings to his credit. His research interests include Polymer matrix composite, Honeycomb sandwich structure, 3D printing and Bio-composite. He has six years of teaching experience in reputed engineering college before joining Amrita School of Engineering, Bengaluru campus.

Education

  • 2020: Ph. D.
    North Eastern Regional Institute of Science & Technology (A CFTI)
  • 2014: M. Tech. in Mechanical Engineering
    NIT Kurukshetra, Haryana
  • 2003: B. Tech. Mechanical Engineering
    BPUT, Odisha

Publications

Publication Type: Journal Article

Year of Publication Title

2020

M. Shruti, Hemanth, N. Sri, Badgayan, N. Dhar, and Dr. Santosh Kumar Sahu, “Compressive behavior of auxetic structural metamaterial for lightweight construction using ANSYS static structural analysis”, Materials Today: Proceedings, 2020.[Abstract]


Metamaterials are the class of man-made cellular structures that are intended to improve the energy absorption ability without an expense on its weight. The current investigation focuses on modeling and compressive simulation of three types of basic metamaterial (i.e Diamond, Auxetic and Hexagon) and its hybrids (i.e Auxetic-diamond, Auxetic-hexagon and Diamond-hexagon) with Ansys 19 simulation software. All the six auxetic metamaterials are simulated by assuming Polylactic Acid (PLA) material. At 0.1 MPa the maximum equivalent von-Mises stress was evident during the compressive analysis of auxetic-diamond hybrid structure. For auxetic-diamond hybrid structure higher energy absorption of 40 mJ was noted. It was observed to decrease by 67, 62, 75, 25 and 40% for auxetic, diamond, hexagon, auxetic-hexagon and diamond-hexagon respectively. The higher value of equivalent von-Mises stress and higher energy absorption is a manifestation of stiffest structure. The deformation results during simulation test confirmed that the basic auxetic structure and its hybrid absorb more energy. The hybrid auxetic metamaterials are the new class structural elements that exhibited extraordinary energy absorption ability.

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2020

R. Kishor Das, S Ngaihte, K., Prasad, R., Kakoti, A., Hoque, R., Dr. Santosh Kumar Sahu, and Badgayan, N. D., “Experimental Investigation into electric Discharge Machining of Ti-6Al-4 V ELI alloy: An insight into biomedical applications”, Materials Today: Proceedings, 2020.[Abstract]


Ti-6Al-4 V-ELI alloy is acknowledged for its biomedical use. In non-traditional machining method like Electrical Discharge Machining, the material removal is through electro-thermal action with no direct contact between tool and work-piece. The emanation of spring-back effect apart from adherence of alloy results with poor surface finish. The same is nullified with the current EDM method by using effect of electro-thermal energy applications thereby achieving close tolerance. The effect of input parameters such as Voltage (V), Current (I) and Pulse on-Time (Ton) on Material Removal Rate (MRR) and Surface Roughness (Ra) was investigated. The Ton was varied between (60&70)μs, voltage of (50&55) V and peak current of (10&12) A. The analysis of result was carried out with 23 factorial degree of experiment and the response contributing highest effect was noted. The MRR, Ra and electrode wear increase with each process parameters. It was found that factors like V, I and Ton have significant effect to varying degrees on MRR and Ra. MRR increased with increase in Ton while Ra increase with decreased in voltage.

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2020

N. Dhar Badgayan, Dr. Santosh Kumar Sahu, and S, R. Sreekanth, “Investigation of wetting behavior of HDPE reinforced with nanoscopic 1D/2D filler system using contact angle goniometry”, Materials Today: Proceedings, vol. 26, pp. 331 - 334, 2020.[Abstract]


Current work investigates wetting abilities of High Density Polyethylene (HDPE) based composites and hybrids. The samples were prepared by varying weight fractions of Multi Walled Carbon Nanotubes (MWCNTs) and hexagonal-Boron Nitride Nanoplatelets (h-BNNPs). The technique used for fabrication was melt mixing followed by injection moulding process. The wetting abilities of the test samples were assessed using an in situ contact angle measurement test setup. The test results confirmed the superior wetting abilities by 0.25 MWCNT/0.15 BNNP hybrid composite. A comparison between angle of contact and surface roughness of test samples was also presented. It was concluded that rough surface tends to more hydrophobic then smoother surfaces. More »»

2020

Dr. Santosh Kumar Sahu, Badgayan], N. [Dhar, and Sreekanth], P. S. [Rama, “Numerical investigation on the effect of wall thickness on quasistatic crushing properties of nylon honeycomb structure”, Materials Today: Proceedings, vol. 27, pp. 798 - 804, 2020.[Abstract]


Honeycomb structures are extensively used energy-absorbing structures in the airplane, spacecraft and automobile body parts. The critical parameters that influence the aggregate energy absorption are cell size, wall thickness and node length. However, wall thickness is a crucial determining factor for crushing and buckling. The type of failure manifested to the crushing of the cells can be predicted with unit cell buckling. The current work investigated on quasistatic crushing properties of honeycomb structure by varying unit cell wall thickness and at constant cell size of 10 mm. The out of plane quasistatic compression test of nylon honeycomb core of various wall thicknesses i.e 1, 1.1, 1.2, 1.3, 1.4 and 1.5 mm is carried out using ANSYS 14 simulation. The results obtained from the test are in close agreement with unit cell buckling analysis for predicting the mode of failure. The ultimate compressive strength of 1.5 mm cell is observed to be 1.4 folds higher than that of 1 mm cell. The energy absorption obtained from load-displacement graph during compression test indicates the proportional relationship between wall thickness and energy absorption. High energy absorption ability for 1.5 mm wall thickness core infers superior crushing strength enables to use as energy-absorbing devices, where lightweight and strength are the prime concern. More »»

2020

N. D. Badgayan, SutanuSamanta,, Sreekanth, P. S. R., and Dr. Santosh Kumar Sahu, “An insight into mechanical properties of polymer nanocomposites reinforced with multidimensional filler system: A state of art review”, Materials Today: Proceedings, vol. 24, pp. 422-431, 2020.

2019

Dr. Santosh Kumar Sahu, Badgayan, N. Dhar, Samanta, S., and Sreekanth, P. S. Rama, “Evaluation of Dynamic Mechanical and Thermal Behavior of HDPE Reinforced with MWCNT/h-BNNP: An Attempt to Find Possible Substitute for a Metallic Knee in Transfemoral Prosthesis”, International Journal of Thermophysics, vol. 40, no. 10, 2019.[Abstract]


Nanotechnology has extended applications of conventional engineering plastics like high-density polyethylene (HDPE) to different biomedical implants such as articular cartilage and fracture fixation plates. However, applications in a load-bearing element like a prosthetic knee require estimation of static, dynamic mechanical, and variation of mechanical properties with temperature. The current work reports on the application of HDPE-based nanocomposite as a possible substitute for a metallic knee in a prosthetic leg. HDPE was reinforced with multiwalled carbon nanotubes (MWCNTs)-1D and boron nitride nanoplatelets (h-BNNPs)-2D to form different composites and hybrids. The preparation route followed the mechanical mixing tandem by curing in a vacuum oven. Dynamic mechanical thermal analysis (DMTA) results confirmed the best elastic and damping property by 0.1 MWCNT composite. The mechanical properties like hardness, impact toughness, and stiffness of 0.25 MWCNT/0.15 h-BNNP were observed to increase by 172 %, 190 %, and 50 % in comparison with pure HDPE. A similar observation was noted during the evaluation of thermal conductivity, thermal stability, and %crystallinity. A modified Halpin–Tsai and Hamilton–Crosser model was used to predict the stiffness and thermal conductivity of composites. The test results confirmed 0.25 MWCNT/0.15 h-BNNP as a potential possible substitute for a metallic knee in a transfemoral prosthesis. More »»

2019

Dr. Santosh Kumar Sahu, Badgayan, N. Dhar, and Sreekanth, P. S. Rama, “Understanding the influence of contact pressure on the wear performance of HDPE/multi-dimensional carbon filler based hybrid polymer nanocomposites”, Wear, vol. 438-439, 2019.[Abstract]


High Density Polyethylene (HDPE) exhibits good mechanical properties but poor resistance to wear which impedes its application in low load bearing industrial components. The current work is focused to understand the influence of contact pressure on the tribological performance of multidimensional carbon based filled HDPE hybrid nanocomposite. The novelty of the work lies in an in-depth investigation of the contact pressure which is observed to influence the wear performance of HDPE based composites and hybrids. The nanofillers of different dimensions; Nano-diamond (ND)-0D, Multiwalled Carbon Nanotubes (MWCNT)-1D and Graphite Nanoplatelets (GNP)-2D were chosen as reinforcements. The individual role of nanofillers and its response to the contact pressure and the prominent wear mechanisms exhibited thereof were studied in detail. 0.1 GNP/ND was noted to exhibit least contact pressure with highest wear resistance and the dictum was exonerated with Tanδ 0.5 confirming its damping abilities thereby pronouncing more wear resistance. The presence of ND in HDPE had strongly influenced the wear performance and it was analyzed based on electron affinity hypothesis. It was concluded that correlating contact pressure with wear volume, and related wear mechanisms of polymeric materials would be a novel contribution in the relevant field.

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2018

N. Dhar Badgayan, Dr. Santosh Kumar Sahu, Samanta, S., and Sreekanth], P. S. [Rama, “Assessment of nanoscopic dynamic mechanical properties and B-C-N triad effect on MWCNT/h-BNNP nanofillers reinforced HDPE hybrid composite using oscillatory nanoindentation: An insight into medical applications”, Journal of the Mechanical Behavior of Biomedical Materials, vol. 80, pp. 180 - 188, 2018.[Abstract]


A thrust on improvement of different properties of polymer has taken a contemporary route with advent of nanofillers. Although several nanofillers are existent; MultiWalled Carbon Nanotubes- (MWCNTs) and h-Boron Nitride nanoplatelets-(h-BNNPs) unique combination of 1D and 2D dimensional geometry aids an advantage of B-C-N triad elemental effects on properties of tested samples. The current study aims to investigate the effects of MWCNT and h-BNNP reinforcement in High Density Polyethylene (HDPE) for high load bearing areas of medical applications requiring both elastic and viscous behavior. The results were analyzed keeping a view of its application in areas like HDPE based fracture fixation plates, acetabular cups and others. The composite and hybrid samples with different loadings were prepared after surface modification of nanofillers by mechanical mixing and molding technique. The dynamic nano-mechanical properties like storage modulus, loss modulus and tan delta were assessed for each sample during frequency swept from 10 to 220 Hz. The viscoelastic properties like hc/hm, H/E, elastic-plastic deformation were investigated and evaluated. At a frequency of 10 Hz, the storage and loss modulus of 0.1 CNT increased by 37.56% and decreased by 23.52% respectively on comparison with pure HDPE. This infers a good elastic as well as viscous behavior. Overall elastic behavior of 0.1 CNT was confirmed from tan delta evaluation. The interaction between B-C-N elemental triad had significant effect on creep strength, visco-damping property (hc/hm and H/E), elastic plastic displacement and pile-up and sink-in behavior. Highest creep strength and visco-damping property was exhibited by 0.25 CNT/0.15 BNNP hybrid. The elastic-plastic displacement of hybrid composite was noted as least, which decreased by 30% on comparison with pure HDPE. It can be inferred that presence of 1D-MWCNT and 2D-h-BNNP had significant effect on important dynamic viscoelastic and creep properties of HDPE based hybrid composites.

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2018

Dr. Santosh Kumar Sahu, Badgayan, N. Dhar, Samanta, S., and Sreekanth], P. S. [Rama, “Quasistatic and dynamic nanomechanical properties of HDPE reinforced with 0/1/2 dimensional carbon nanofillers based hybrid nanocomposite using nanoindentation”, Materials Chemistry and Physics, vol. 203, pp. 173 - 184, 2018.[Abstract]


Engineering polymers poses critical loopholes like lack of stiffness, hardness and wear resistance which were influenced by nanomechanical properties like hardness, plasticity index and differential damping behaviour. Study reports on preparation and characterization of novel nanocomposite and hybrid nanocomposite that would be alternate to virgin engineering polymers using quasistatic and dynamic nanoindentation. Nanocomposites and hybrid nanocomposites were prepared using High density polyethylene (HDPE) as matrix reinforced with alternate and possible combination of 0D (Nano-Diamonds-(NDs), 1D (Multi-Walled Carbon Nanotubes- (MWCNTs) and 2D (Graphite nanoplatelets-(GNPs) nanofillers using twin screw injection moulding machine. Quasi static Properties like; hardness, Young's modulus of HDPE/0.1 GNP/0.1 ND was observed to increase by 83.33, 25.17% on comparison to pure HDPE and plasticity index reduced by 67.77%. Dynamic properties like; storage modulus, loss modulus and Tan delta at a frequency sweep from 10 to 220 Hz confirm the overall elastic behavior of the nanocomposites. More »»

2018

Dr. Santosh Kumar Sahu, Badgayan, N. Dhar, Samanta, S., Sahu, D., and Sreekanth, P. S. Rama, “Influence of Cell Size on out of Plane Stiffness and in-plane Compliance Character of the Sandwich Beam made with Tunable PCTPE Nylon Honeycomb Core and Hybrid Polymer Nanocomposite Skin”, International Journal of Mechanical Sciences, vol. 148, pp. 284 - 292, 2018.[Abstract]


Sandwich structures with honeycomb core find specific application in impact resistance and energy absorption applications. However, such studies were limited to cores with metallic honeycomb, which had limited energy absorption abilities apart from extrinsic weight. The current work aims to fabricate hybrid sandwich beams made with PCTPE (Plasticized Co-polyamide Thermoplastic Elastomer) nylon using Fused Filament Fabrication (FFF). The cell size was varied from 10 to36 mm with a variation of longest diagonal. The face sheets were prepared with High-density polyethylene (HDPE) matrix with equal loading of Graphite nanoplatelet and Nano-diamond hybrid filler system. The face sheets were joined to honeycomb core to prepare sandwich panel with tailored made adhesive. It was observed that during out of the plane test, for 10 mm cell the SEA (specific energy absorption) was 1.15 kJ/kg, which decreased upto and 69% for 36 mm respectively. During the in-plane flexural test, the minimum flexural modulus showed by 36 mm longest diagonal cell was 31 MPa, which had increased further by 24, 50, 62, 67 and 76% for 27, 21, 15, 12 and 10 mm respectively, indicating elastic nature and damping ability of sandwich beam. The free vibration analysis was performed on by taking cantilever configuration. The experimentally obtained results were then validated using Ansys-14 simulation. It was concluded that PCTPE nylon core exhibited dual properties of stiffness and compliance for the period of out-plane testing and in-plane respectively, with a threshold limit of 36 mm cell size.

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2017

A. Nayak, Sreekanth, P. S. Rama, Dr. Santosh Kumar Sahu, and Sahu, D., “Structural tuning of low band gap intermolecular push/pull side-chain polymers for organic photovoltaic applications”, Chinese Journal of Polymer Science, vol. 35, no. 9, pp. 1073-1085, 2017.[Abstract]


A series of novel low band gap donor-acceptor (D-A) type organic co-polymers (BT-F-TPA, BT-CZ-TPA and BT-SI-TPA) consisting of electron-deficient acceptor blocks both in main chains (M1) and at the pendant (M2) were polymerized with different electron rich donor (M3−M5) blocks, i.e., 9,9-dihexyl-9H-fluorene, N-alkyl-2,7-carbazole, and 2,6-dithinosilole, respectively, via Suzuki method. These polymers exhibited relatively low band gaps (1.65−1.88 eV) and broad absorption ranges (680−740 nm). Bulk heterojunction (BHJ) solar cells incorporating these polymers as electron donors, blended with [6,6]-phenyl-C61-butyric acid methyl ester (PC61BM) or [6,6]-phenyl-C71-butyric acid methyl ester (PC71BM) as electron-acceptors in different weight ratios were fabricated and tested under 100 mW/cm2 of AM 1.5 with white-light illumination. The photovoltaic device containing donor BT-SI-TPA and acceptor PC71BM in 1:2 weight ratio showed the best power conversion efficiency (PCE) value of 1.88%, with open circuit voltage (V oc) = 0.75 V, short circuit current density (J sc) = 7.60 mA/cm2, and fill factor (FF) = 33.0%.

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2017

N. Dhar Badgayan, Samanta, S., Dr. Santosh Kumar Sahu, Siva, S. B. Venkata, Sadasivuni, K. Kumar, Sahu, D., and Sreekanth, P. S. Rama, “Tribological behaviour of 1D and 2D nanofiller based high densitypoly-ethylene hybrid nanocomposites: A run-in and steady state phase analysis”, Wear, vol. 376-377, pp. 1379 - 1390, 2017.[Abstract]


Hybrid nanocomposites are a class of materials with exceptional properties due to the synergizing effect of individual fillers. Current work reports the tribological behaviour of high densitypolyethylene-(HDPE) reinforced with 1D-(Multi walled carbon nanotubes-(MWCNTs) and 2D-(h-Boron Nitride nanoplatelets-(BNNP) nanofillers. MWCNTs and BNNPs are chemically modified prior to solution deposition on HDPE and then processed through injection moulding. Testing was performed by varying Load, Speed and Sliding distance for all samples. Parameters such as wear volume, static and kinetic friction co-efficient, surface roughness in steady state and run-in phases, hardness, plasticity index and thermal expansion coefficient were reported. The wear volume of 0.1BNNP composite has shown reduced values as compared to 0.1MWCNTfor all parameters of testing. Highest wear resistance is exhibited by HDPE/0.25MWCNT/0.15BNNP hybrid nanocomposite. Plasticity index was reduced by 40% for HDPE/0.25MWCNT/0.15BNNP sample. The surface roughness increased with speed and sliding distance, while reduced with increasing load. Static and kinetic friction coefficients were also estimated. The surface morphology was examined at the end of Run-in and Steady state to identify prominent wear mechanisms. It is concluded that BNNP based composites possess better properties compared to MWCNT for equal loading, however, Hybrid composites of 1D/2D nanofillers has been shown superior properties. More »»

2016

Dr. Hari Mohan Kushwaha and Dr. Santosh Kumar Sahu, “Comprehensive Analysis of Convective Heat Transfer in Parallel Plate Microchannel with Viscous Dissipation and Constant Heat Flux Boundary Conditions”, Journal of The Institution of Engineers (India): Series C, vol. 98, pp. 553–566, 2016.[Abstract]


This paper reports the hydrodynamically and thermally fully developed, laminar, incompressible, forced convective heat transfer characteristics of gaseous flows through a parallel plate microchannel with different constant heat flux boundary conditions. The first order velocity slip and viscous dissipation effects are considered in the analysis. Here, three different thermal boundary conditions such as: both plates kept at different constant heat fluxes, both plates kept at equal constant heat fluxes and one plate kept at constant heat flux and other one insulated are considered for the analysis. The deviation in Nusselt number between the model that considers both first order velocity slip and temperature jump and the one that considers only velocity slip is reported. Also, the effect of various heat flux ratios on the Nusselt number is reported in this analysis. In addition, the deviation in Nusselt number between first and second order slip model is discussed in this study.

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2016

Dr. Hari Mohan Kushwaha, Selvakumar, P. Bharvath R., and Dr. Santosh Kumar Sahu, “Effect of Shear Work on the Heat Transfer Characteristics of Gaseous Flows in Microchannels”, Chemical Engineering & Technology, vol. 40, no. 1, pp. 103–115, 2016.[Abstract]


The effect of shear work at solid boundaries for parallel plates and a micropipe is considered to analyze the heat transfer characteristics in the slip flow region for gaseous flow. The fluid flow is assumed to be laminar, incompressible, steady, and hydrodynamically and thermally fully developed. The effects of second‐order velocity slip, temperature jump, shear work at the solid surface, and viscous dissipation are considered. The constant heat flux boundary condition is used at the surface of the parallel plates and of the micropipe. Closed‐form expressions are obtained for the temperature distribution and Nusselt number as a function of various modeling parameters for both geometries. The results show that neglecting the shear work underpredicts the Nusselt number.

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2014

Dr. Hari Mohan Kushwaha and Dr. Santosh Kumar Sahu, “Effects of Viscous Dissipation and Rarefaction on Parallel Plates with Constant Heat Flux Boundary Conditions”, Chemical Engineering & Technology, vol. 38, 2014.[Abstract]


The effect of viscous dissipation and rarefaction on heat transfer characteristics of hydrodynamically and thermally fully developed flow between parallel plates with constant heat flux conditions is analyzed. Three different types of heat flux boundary conditions, i.e., both plates kept at different constant heat fluxes, both plates kept at equal constant heat fluxes, and one plate insulated, are applied. In all cases, closed form expressions are obtained for the temperature distribution and Nusselt number. Viscous dissipation, rarefaction, and heat flux ratio are found to influence the heat transfer substantially. The present predictions are verified for the cases which neglect the microscale and viscous heating effect. The obtained results are in good agreement with other analytical results. More »»

Publication Type: Conference Proceedings

Year of Publication Title

2018

Dr. Santosh Kumar Sahu, Badgayan, N. Dhar, Samanta, S., and Sreekanth, P. S. Rama, “Experimental Investigation on Multidimensional Carbon Nanofiller Reinforcement in HDPE: An Evaluation of Mechanical Performance”, IConAMMA, vol. 24. IOP, ASE, Bangalore, pp. 415 - 421, 2018.[Abstract]


The current work reports on the evaluation of mechanical properties of HDPE reinforced with multidimensional carbon based nanofillers: Nanodiamonds (ND)-0D, Multiwalled Carbon Nanotubes (CNT)-1D and Graphite nano Platelets (GNP)-2D. A twin screw injection molding machine was used to fabricate samples and designated according weight percentage of nanofiller in pure HDPE as 0.1 ND, 0.1 CNT,and 0.1 GNP respectively. The optimum mechanical properties was exhibited by 0.1 ND, with a noted increase of 33.6, 23, 42, 34% in hardness, Young‘s modulus, fracture stress and yield stress as compared with pure HDPE. Halpin Tsai equation was used to predict Young‘s modulus of composite and results confirmed a close agreement between predicted and experimental observations.

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Publication Type: Conference Paper

Year of Publication Title

2018

N. Dhar Badgayan, Dr. Santosh Kumar Sahu, Samanta, S., Srinivasa, P., and Sreekanth, R., “Assessment of Bulk Mechanical Properties of HDPE Hybrid Composite Filled with 1D/2D Nanofiller System”, in Material Science and Engineering Technology VI, 2018.[Abstract]


Current work reports on evaluation of bulk mechanical properties of High Density Polyethylene (HDPE) reinforced with functionalized 1D (Multi Walled Carbon Nanotubes- (MWCNTs) and 2D (hexagonal-Boron Nitride Nanoplatelets-(h-BNNPs) fillers. Mechanical mixing and injection moulding technique was used to prepare the composites. Evaluation of bulk mechanical properties like hardness, yield stress, fracture stress, impact toughness and Young`s modulus was carried out. The optimum properties were exhibited by HDPE/0.25 MWCNT/0.1 BNNP. Hardness, yield stress, fracture stress, impact toughness and Young`s modulus was observed to increase by 93.84, 80.83, 59.23, 115 and 42.05% on comparison with pure HDPE. TEM images confirm the tubular and hexagonal morphology of MWCNT and h-BNNP. It is concluded from test results that addition of MWCNT and h-BNNP into HDPE has improvised mechanical properties. More »»

2018

Dr. Santosh Kumar Sahu, Badgayan, N. Dhar, Samanta, S., Srinivasa, P., and Sreekanth, R., “Dynamic Mechanical Thermal Analysis of High Density Polyethylene Reinforced with Nanodiamond, Carbon Nanotube and Graphite Nanoplatelet”, in Material Science and Engineering Technology VI, 2018.[Abstract]


Present work reports on Dynamic Mechanical Thermal Analysis (DMTA) of HDPE reinforced with surface modified 0D (Nanodiamonds-NDs), 1D (Multi Walled Carbon Nanotubes-MWCNTs) and 2D (Graphite nanoplatelets-GNPs) nanofillers. Composite samples were prepared using twin screw injection moulding machine. Dynamic properties like storage, loss modulus and tan delta were investigated as a function of temperature and at constant oscillation of 1 Hz. Optimum properties were exhibited by 0.1 CNT/HDPE during a temperature swept from 30 to 110 oC. The storage modulus and loss modulus of 0.1 CNT/HDPE increased by 57 and 28% on comparison with pure HDPE. 0.1 CNT/HDPE exhibited highest ascent during tan delta evaluation confirming good damping property. TEM analysis was carried out to investigate the morphology of ND, MWCNT and GNP. More »»

Publication Type: Book

Year of Publication Title

2017

L. A. Pruitt, Sreekanth, P. S. Rama, Badgayan, N. D., and Dr. Santosh Kumar Sahu, Fatigue of Polymers. 2017.[Abstract]


Fatigue is a phenomenon under which, due to repetitive application of load the damage accumulates and the load may be well below the yield point. Fatigue failure leads to catastrophe which could be reviewed from air disaster of BOAC flight 781.The applications of polymers has now diversified from ordinary plastic bottles to high tech polymer gears. In order to manufacture an end use component made up of polymeric material it is prerequisite to understand the different failure mechanism of it. Fatigue loading is prevalent in engineering applications and can lead to catastrophe. This article presents a detail insight of fatigue failure mechanism of polymers intended toward future developments.

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2017

P. S. Losey, Kelly, M. W., Badgayan, J. J., Dr. Santosh Kumar Sahu, and Sreekanth, R., Electrodeposition, vol. 13. https://doi.org/10.1016/B978-0-12-803581-8.10137-7, 2017.

Publication Type: Book Chapter

Year of Publication Title

2017

Dr. Hari Mohan Kushwaha and Dr. Santosh Kumar Sahu, “Analysis of Heat Transfer in the Slip Flow Region Between Parallel Plates”, in Lecture Notes in Mechanical Engineering, 2017, pp. 1331-1339.[Abstract]


In this paper, an analytical study has been carried out to investigate the effect of viscous dissipation on heat transfer characteristics in the slip regime for the fluid flowing between two infinite fixed parallel plates. The flow is assumed to be hydrodynamically and thermally fully developed with constant properties. In the present analysis, one wall is considered as adiabatic and the other one is kept at constant heat flux. Closed form expressions are accomplished for the Nusselt number as a function of Knudsen number and Brinkman number. The limiting condition of the present prediction for Kn = 0, Kn 2 = 0, and Br = 0 is presented to verify the results. More »»

2017

Dr. Santosh Kumar Sahu, Pruitt, L. A., Sreekanth, P. S. Rama, and Badgayan, N. D., “International Journal of Fracture”, in Reference Module in Materials Science and Materials Engineering, vol. 16, 499–532(1980) vol., 2017.[Abstract]


Fatigue is a phenomenon under which, due to repetitive application of load the damage accumulates and the load may be well below the yield point. Fatigue failure leads to catastrophe which could be reviewed from air disaster of BOAC flight 781.The applications of polymers has now diversified from ordinary plastic bottles to high tech polymer gears. In order to manufacture an end use component made up of polymeric material it is prerequisite to understand the different failure mechanism of it. Fatigue loading is prevalent in engineering applications and can lead to catastrophe. This article presents a detail insight of fatigue failure mechanism of polymers intended toward future developments. More »»

2007

G. Paulino, Jin, Z. H., Dodds, R. H., and Dr. Santosh Kumar Sahu, “Failure of Functionally Graded Materials”, in Comprehensive Structural Integrity, vol. 2, Elsevier Ltd, 2007, pp. 607–644.