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January 1999 - present
Publications
Publications (83)
The present study explores the copolymerization of mercerized Flax (mFlax) using a combination of acrylamide (AAm) and polyvinyl alcohol (PVA) as a binary vinyl monomeric mixture (AAm:PVA). Polyester‐based composites reinforced with different Flax samples, i.e., raw, mercerized, and grafted Flax with a 5% loading concentration, were fabricated, and...
Wire arc-directed energy deposition advances complex part development, benefiting high-demand commercial applications, especially for parts with integrated cooling channels. Therefore, in the current study, hollow tubes with 6 mm internal diameter and 120 mm height were fabricated to analyse its mechanical properties along the build height. Various...
Carburizing is a surface treatment process by diffusing carbon into the steel. These days, manufacturing industries demand highly efficient processes that consume low power. Microwave processing is a newly evolving process that consumes low power. This study proposes a novel route for carburizing mild steel (substrate) through experimental and simu...
In welding, the Heat Affected Zone (HAZ) refers to the region of the base metal that has been subjected to a temperature change during the welding process. The HAZ is a critical area in welding because it can have significant impacts on the mechanical properties and overall quality of the welded joint. Microwave welding is a technique of joining me...
This study reports new observations from the fabrication of high-aspect-ratio hollow tubes of SS410 through wire-arc directed energy deposition (wire-arc DED) process. Characterisation work was performed on a single tube as a function of its build height. The maximum ultimate tensile strength (UTS) of 1372 MPa and maximum yield strength (YS) of 980...
The source of heat is one of the crucial parameters that has varied significantly over the years for the fabrication of metal joints. A requirement for a new source of heat is justified by the fact that a single source of heat is not suitable for joining all the metals. Knowing the disadvantages of conventional welding processes, a novel heat sourc...
In this chapter, finite element (FE) simulation is performed based upon experimental uniaxial data reported in previous literature for boron-added P91 (P91B) steel. The ABAQUS FE package is used for simulation. An axisymmetric FE model of a 10×10×10 mm specimen with a rigid cylindrical flat punch of 0.5 mm radius is developed. The elastic and plast...
The aim of present work is to fabricate a polyester composite reinforced with mercerized flax-g-poly(polyvinyl alchol + acrylic acid) copolymer. In addition, a comparative study of mechanical properties using dynamic mechanical analysis (DMA) technique was made as a function of reinforcement of matrix with raw flax (rFlax) and mercerized flax (mFla...
Rice straw is an agricultural waste, disposal of which through open burning is an emerging challenge for the ecology, especially in under developed countries. Green composites manufactured using rice straw as reinforcement material provides a more avant-grade technique that not only nurtures environmental stewardship by reducing waste and carbon fo...
Metal additive manufacturing (MAM) can better complement existing methods by providing hybrid structural strengthening and repair solutions. This opportunity and challenge can only be fulfilled by joining additive-manufactured (AM) parts with conventional ones. In this study, AM SS316 is joined with conventional SS316 through selective microwave hy...
The joining of austenitic stainless steels through microwave hybrid heating has gained much attention due to its advantages, like uniform and volumetric heating. However, to establish a microwave joining process for promising applications, a microstructural study of the welded joint is still an area to explore. In the present study, microstructural...
Viability of recycling polyethylene terephthalate (PET) can be enhanced by increasing its usage as a matrix material in manufacturing of composite materials. Structural applications of composite materials almost always involve fatigue loading and evaluation of fatigue behaviour is essential to explore the full potential of composite materials based...
The joint between dissimilar materials is always challenging to develop through traditional techniques due to the different properties of the parent materials. However, a novel non-traditional route of joining similar and dissimilar materials through energy conversion and absorption has been developed called SMHH (selective microwave hybrid heating...
The microwave processing of materials is gaining popularity over the past decade due to its unique heating abilities. The microwave hybrid heating (MHH) technique has effectively processed bulk metallic materials. MHH is assisted by susceptor material which forces metals to absorb microwave radiations. Further, MHH is modified to selective microwav...
Microwave joining is an eco-friendly non-conventional technique resulting in fine grain structure, overall improvement in quality, and performance of the processed materials with up to 90 % less energy consumption than conventional processes. Due to problems including difficulty in positioning the susceptor material in the joint region and reduced...
Waste polyethylene terephthalate (PET) in the atmosphere creates an environmental concern. The use of waste PET as a matrix in a composite lowers the cost and environmental impact. In this study, the unsaturated polyester resin (rPET-UPR) is extracted from waste PET through the chemical recycling route (glycolysis) for the fabrication of four-ply g...
The use of robotic trainers in the medical field for rehabilitation has increased in recent years due to the results they can achieve compared to conventional therapy methods. This study proposes the design of a U-frame and handrail assembly in a dynamic bodyweight support system of a robotic trainer and provides the static structural analysis of t...
The motivation behind present investigation has been a step to create preliminary understanding towards structure-property correlation i.e., microstructure and microhardness in presence of boron in P91 steel and in its subzones of HAZ with Gleeble simulation. For microstructure characterization and its comparison amongst selected two steels, light...
Microwave joining is a non-conventional joining method that can be used to join bulk metals. Different types of joints such as butt-joint, lap joint, etc. can be successfully joined with this novel green technique of joining. In this paper, a domestic microwave oven having a power output of 700W, frequency of 2.45 GHz, and capacity of 25L is used t...
Impression creep is a versatile technique that is used nowadays for studying the creep deformation of different materials and there is no tertiary stage in this method; it's a non-destructive process. The present work deals with finite element analysis of plastic deformation corresponding to the impression creep deformation of P91 steel. In the FE...
Impression creep testing technique is used to screen out creep behaviour of materials as it is relatively faster method, requires small volume of the specimen, and is relatively material non-invasive technique when compared to conventional uniaxial tensile creep test method. This technique also possesses the benefit of maintaining constant stress t...
The development of joints using microwave hybrid heating (MHH) received extensive attention over conventional heating due to its uniform heating, environment friendly characteristics. For effective microwave joining of bulk metals, joint region was targeted selectively naming it as selective microwave hybrid heating (SMHH). Microwave joining of sta...
Conventional joining techniques like soldering, welding, and brazing are used by various fabrication industries but these processes have some limitations like more power consumption, higher processing time, and greater heat-affected zone. The need of the hour is to find alternate welding techniques that can be more environment-friendly, cost-effect...
Microwave joining is an eco-friendly non-conventional technique resulting in fine grain structure, overall improvement in quality, and performance of the processed materials with up to 90 % less energy consumption than conventional processes. Due to problems including difficulty in positioning the susceptor material in the joint region and reduced...
Natural fibers such as rice straw (RS) are widely available in abundance and these residues are predominantly burned off in open fields. The burning of these rice straws, by the virtue of incomplete combustion, emits detrimental pollutants (greenhouse gases) and particulate matters (inhalable particles), which contribute to global warming and air p...
This paper induced a novel methodology for the characterization of creep behavior of weld heat-affected zone (HAZ) for boron-free P91 (PM) and boron modified P91B (B-PM) steels. Gleeble-3800 thermo-mechanical simulator replicated specimens, representing coarse-grain HAZ (CGHAZ), fine-grained HAZ (FGHAZ), and inter-critical HAZ (ICHAZ). Short-term i...
Microwave joining is an upcoming technique of joining similar and dissimilar materials. Different metals, non-metals, alloys, and ceramics have already been joined successfully in the past. However, the joining of long bulk metals is always challenging and an impediment in commercial exploitation of microwave joining methods. Lap joints on SS202 sp...
P91B steel was subjected to a finite element (FE) study of plastic deformation consistent with impression creep deformation. An axisymmetric FE model of a 10×10×10 mm specimen with a rigid cylindrical flat punch of 0.5-mm radius was developed. The elastic-plastic-power-law creep deformation behavior was assumed in the FE simulation of impression cr...
In this paper, the modal-model of the composite structure is predicted and viewed to decide the optimal position of the PZT sensors on the composite structures. The novelty of this work is to systematically study the effect of fiber orientations and boundary conditions on the modal-model and the optimal location of the PZT sensors on the composite...
In this paper, the modal-model ofthe composite structure is predicted and viewed to decide the optimal position ofthe PZT sensors on the composite structures. The novelty ofthis work is to systematically studythe effect offiber orientations and boundaryconditions on the modal-model and the optimal location ofthe PZT sensors on the composite structu...
Results of an investigation conducted to study the flexural fatigue of epoxy resin based Polymer Concrete Composites (PCC) and Glass Fibre Reinforced Polymer Concrete Composites (GFRPCC) are reported. Three point flexural fatigue tests were conducted on PCC and GFRPCC specimens using MTS servo controlled cyclic load test setup to obtain the fatigue...
Polymer matrix composites have established themselves in the materials family due to their improved properties like high specific stiffness and strength, durability etc. Recycled polyethylene terephthalate (RPET) is being used as matrix material in a variety of polymer matrix composites. Composite materials based on RPET matrix, in addition to bein...
Epoxy resin concrete has high strength, good durability, good toughness, short forming time, and the advantages of easy construction, etc. As a high-performance material, it has been applied in various fields such as machinery, construction, chemical industry, truss structures, etc. Based on its high strength, better seismic resistance than concret...
In the present endeavor, a Gleeble thermo-mechanical simulator has been used to simulate subzones of the heat-affected zone (HAZ) of boron-free P91 and boron-modified P91B steels to investigate the influence of boron on microstructure and mechanical properties. The prior austenite grain (PAG) size remained similar to that of parent metal in the fin...
Conventional P91 and boron modified P91-steels were considered in the present investigation. Using Gleeble, weld intercritical heat-affected zone (ICHAZ) was processed. Conventional microscopy was done along with electron back-scattered diffraction for both specimens. Lath boundary of martensite was more, and preferably oriented for P91B-ICHAZ than...
In this paper, the acoustical sound absorbing property such as Insertion Loss (IL) or sound transmission loss (STL) of natural fibers is measured experimentally. The STL is measured for tonal acoustic excitations (one-third octave band harmonic frequencies). The tonal acoustic excitations are generated by using acoustic transducer (loudspeaker) and...
Knowing the advantages of microwave processing on different materials, it has established a good base for the sintering process. Although it has similar advantages for other processes, still other fields are not much established for industrial use. Microwave casting is one of the emerging fields which are yet to be studied in detail. In this paper,...
Over the years there has been a growing interest among researchers to produce and evaluate mechanical properties of fiber reinforced recycled thermoplastic and thermoset resin composites which are derived from non-biodegradable and non-renewable plastics that comprise of massive fraction of disregarded solid waste today. Current paper reviewed all...
![Fig. 2. Schematic diagram of Selective Microwave Hybrid Heating [17].](profile/Rahul-Samyal/publication/338461352/figure/fig2/AS:849728111648769@1579602377388/Schematic-diagram-of-Selective-Microwave-Hybrid-Heating-17_Q320.jpg)
![Fig. 4. Microstructure of stainless steel joint [11].](profile/Rahul-Samyal/publication/338461352/figure/fig4/AS:849728111661068@1579602377655/Microstructure-of-stainless-steel-joint-11_Q320.jpg)
The application of microwave radiation for the processing of different materials is increasing frequently. Initially, microwaves were used for communication purpose but, due to its thermal ability currently, it is used for sintering, cladding, casting, and joining processes. Microwave joining of the materials is an emerging field of research that p...
This paper was dedicated to rationalizing the effect of boron modifications in alloy design of 9%Cr steels. It acquired the values of nucleation and dissolution temperatures, and mechanical properties (further referred to properties) from computational software. Subsequently, properties were validated for five different boron modifications and were...
The process of joining the different metals has been used from earlier times termed as ‘welding’. Now a day’s microwave joining is gaining so much popularity because of its inherent advantages such as eco-friendly, economical, fewer defects and impurities when compared to other conventional welding processes (like MIG, TIG and arc welding). Many ma...
Purpose-AA2014 is a copper-based alloy and is typically used for production of complex machined components, given its better machinability. The purpose of this paper was to study the effects of variation in weight percentage of ceramic Al 2 O 3 particulates during electrical discharge machining (EDM) of stir cast AA2014 composites. Scanning electro...
Present work was intended to determine the effect micro-alloying 100ppm boron on evolution of nano-precipitates in singular heat affected zone (HAZ) of modified P91 (9Cr-1Mo-NbV) steel. Two P91 steels having 22ppm boron and 100ppm boron were used to physically simulate sub-HAZ regions of the weldment in the form of singular HAZ specimens i.e. HAZ -...
In an attempt to understand the effect of boron addition on creep deformation behavior under high stress and high temperature in martensitic P91 steel, impression creep tests were carried out on boron-free P91 (P91) and boron-added P91 (P91B) steels. The experimental program consisted of three steps, i.e., characterization of as-received steels by...
In this work, PET(Polyethylene terephthalate) was recycled and used as the resin to bind the aggregates. Both natural and recycled aggregates were used in the study. There is problem of non-biodegradability with both PET and construction wastes which were recycled and used in this study. This leads to Sustainable growth. In present study five mixtu...
In present work, polymer concrete was made using resin obtained from recycled PET bottles. Five mixtures consisting of various combination of natural and recycled aggregate obtained from construction waste were manufactured with PET resin and silane coupling agent. Two samples of each type of mixture were prepared separately for flexural strength t...
To defend against extreme accidental and intentional loadings, a need for developing civilian and military structures having high impact resistance and ductility has been realized. Present endeavour aimed at reviewing latest innovations on functionally graded fiber reinforced concrete (FRC) composites in past three years for improved impact resista...
Boron addition to 9–12%Cr steels has proved to be attractive for improving creep properties. In current work, mechanisms pertaining to enhanced creep performance on addition of 100 ppm boron in standard P91 steel were investigated with the use of scanning electron microscopy (SEM), electron back-scattered diffraction (EBSD), and transmission electr...
The present work investigates the machinability and influence of process parameters on the machining characteristics in EDM of AA2014/Al2O3 composite. The composite was fabricated through stir casting technique. Process parameters considered are current, voltage, pulse on time and wt.% reinforcement for the purpose of optimisation. Machining charac...
Modified 9Cr1Mo (P91) having ferritic/martensitic structure is a candidate material for thermal powerplant industry due to its enhanced creep resistance. Fusion welding of P91
steel nurtures heat affected zone (HAZ) which gives rise to infamous type IV failure/cracking. The origination of type IV cracking still remains ambiguous mainly due to sampl...
The paper reviews the findings of various investigations carried out to study the performance of Self Compacting Concrete (SCC) and Self Compacting Fibre Reinforced Concrete (SCFRC) and to correlate their hardened properties with those of Normally Vibrated Concrete (NVC) and Normally Vibrated Fibre Reinforced Concrete (NVFRC). An attempt has been m...
This paper critically assesses phase transformations occurring after welding and subsequent post weld heat treatments in simulated sub-heat affected zones (HAZ) of P91B steel. Samples for weld-HAZ simulation were produced corresponding to grain-coarsened HAZ, grain-refined HAZ and inter-critical HAZ. Analyses revealed diverse phase transformation m...
Effect of boron modified microstructure on creep behaviour of simulated HAZ produced on reheating passes has been examined by impression creep technique. Short duration creep tests for 20 hours were run at 625 o C and 365 MPa on simulated P91 and P91B multipass HAZs representing CG + FGHAZ and CG + ICHAZ as well as on as received steel alloys of P9...
Existence of microstructural heterogeneity among subzones of weld heat affected zone (HAZ) in P91 steel after welding results in formation of metallurgical notch at outer HAZ (FGHAZ/ICHAZ) which gives invitation to type IV cracking as weldments are put into creep exposure. In the present work effect of boron modified microstructure on creep behavio...
Welding of ferritic/martensitic steels degrades the metallurgical properties at heat affected zone (HAZ) near the fusion line in comparison to virgin steel (VS). The selected post weld heat treatment (PWHT) condition gave an improvement in microstructural features, stability of fine precipitates and significant drop in hardness gradient among simul...
Present work investigates the influence of process variables on the machining characteristics in electrical discharge machining of 20wt%Al2O3/AA2014 composite by varying one parameter at a time approach. The composite was fabricated through stir casting process. Process variables considered are pulse current, discharge voltage, pulse on time and pu...
This research paper is concerned with a successfully developed
adaptive neuro-fuzzy inference system (ANFIS) for detection of indication size
(of the penetrant) for liquid penetrant test. The evaluation of the neuro-fuzzy
model has been comprehensive; it has been performed using a database of
indication size containing 252 valid data points in...
In the present study, the damping characteristics of glass fibre-reinforced epoxy polymer concrete is evaluated and compared with that of cast iron. Effect of resin content, fibre content, filler content and aggregate mix type on damping of polymer concrete has been studied using Taguchi design of experiments methodology. Fly ash is used as filler...
Polymer concrete was introduced in late 1950’s and became well known in 1970’s for its use in repair, thin overlays and
floors, precast components. Because of its properties like high compressive strength, fast curing, high specific strength,
resistance to chemical attack, polymer concrete has found application in very specialized domains. Simultan...
The paper presents the results of an investigation conducted to assess the fatigue-life and prediction of flexural fatigue strength of polymer concrete composites based on epoxy resin as binder material. Three point flexural fatigue tests were conducted on polymer concrete specimens using MTS servo controlled actuator, to obtain the fatigue lives o...
This paper deals with the evaluation of damping of Polyester Polymer Concrete using Taguchi method of Design of Experiments. As Polymer Concrete is finding new applications in addition to their basic use in civil application i.e. structures, machine tool beds etc. due to their better properties, it is necessary to characterize damping of the materi...
Flexural fatigue behavior of Polypropylene fibre reinforced polymer concrete composites (PFRPCC) has been investigated at various stress levels and the statistical analysis of the data thus obtained has been carried out. Polymer Concrete Composite (PCC) samples without addition of any type of fibres were also tested for flexural fatigue. Forty spec...
Polymer concrete is a composite material made of aggregates and polymeric resin as a binder. The applications of polymer concrete is limited not only to the domain of civil engineering but it has got inroads in to structural applications in Machine tool structures. Till date no standard mix design procedures are available for polymer concrete syste...
Polymer concrete was introduced in the late 1950s and became well known in the 1970s for its use in repair, thin overlays and floors,
and precast components. Because of its properties like high compressive strength, fast curing, high specific strength, and resistance
to chemical attacks polymer concrete has found application in very specialized dom...
Occupational noise exposure has been linked to a variety of negative health effects by various researchers around the world. Occupational noise induced hearing loss (NIHL) is the most prevalent irreversible industrial disease and noise is the biggest compensable occupational hazard in many countries according to a WHO report. It is estimated that c...
In this study the damping property of the epoxy polymer concrete is analysed in relation to its composition, i.e., percentage of epoxy and percentage of filler. Foundry sand having a mean particle size in 300 to 450 µm range is used as aggregate in polymer concrete. Twelve different compositions of polymer concrete are evaluated in this study consi...
![Figure 2. Modeling efficiency of ANFIS. Data from [11], 40% used for...](profile/Raman-Bedi/publication/255620605/figure/fig2/AS:669255288770561@1536574303086/Modeling-efficiency-of-ANFIS-Data-from-11-40-used-for-the-training_Q320.jpg)
![Figure 3. Modelling efficiency of ANFIS. Data from [11], 70% used for...](profile/Raman-Bedi/publication/255620605/figure/fig3/AS:669255288766466@1536574303107/Modelling-efficiency-of-ANFIS-Data-from-11-70-used-for-the-training_Q320.jpg)
During the last decade novel computational methods have been introduced in a number of sectors of the engineering science. After proving their abilities in pattern recognition, data clustering, signal processing etc, artificial neural networks (ANN) and genetic algorithms (GA) have been initially used in engineering as tools for optimization of des...
This study presents hygrothermal degradation of unidirectional glass fiber reinforced polyester composites (GFRPC). Water absorption of GFRPC immersed in distilled water (DW) at RT and river water (RW) at different temperatures was studied. Water absorption of GFRPC immersed in distilled water increased with time and temperature except for samples...
Occupational noise has been recognized as hazardous for the human beings. A high noise level in forging shops is considered to lower the labour productivity and cause illness however occupational noise is being accepted as an integral part of the job. The present study has been carried out in 5 small scale hand tool forging units (SSI) of different...
There has been an upsurge in the application of composite materials in the last few decades, due to high demands on material performance placed by advanced technologies. Most of these applications include the situations where degradation of strength and life by fatigue process is most likely. In this investigation, rotating bending fatigue tests ha...
Adaptive neuro-fuzzy inference system (ANFIS) has been successfully used for the modelling of fatigue behaviour of a multidirectional composite laminate. The evaluation of the neuro-fuzzy model has been performed using a data base containing 257 valid fatigue data points. Coupons were cut at 0° on-axis and 15°, 30°, 45°, 60°, 75°, and 90° off-axis...
Occupational Noise exposure has been linked with a range of negative health effects by various researchers. The resulting injury of occupational hearing loss is also a well recognized and global problem. To protect workers from hearing damage due to noise exposure and other related health effects, a vast store of knowledge has been accumulated till...
Simplified methodology has been developed to get the optimum design of the axial flow compressor stage. Massarado and Satta have taken twelve design variable to optimize a multi-variable objective function consisting of stage isentropic efficiency, stage enthalpy equivalent static pressure rise coefficient and inlet stage specific area. In this wor...
