Sehijpal Singh - Academia.edu (original) (raw)

Papers by Sehijpal Singh

$Research paper thumbnail of Flax fiber reinforced polylactic acid composites for non-structural engineering applications: Effect of molding temperature and fiber volume fraction on its mechanical properties$

Polymers and Polymer Composites, 2021

Owing to its biodegradability, durability, low cost and potential material to replace existing co... more Owing to its biodegradability, durability, low cost and potential material to replace existing commercial products in the field of engineering applications, nowadays there is a lot of interest in the field of green composites. It is formed by a mixture of biodegradable polymers and natural fibers and has a potential to replace synthetic polymer based composites. In this research work flax fibers are used as reinforcement and Poly-lactic acid (PLA) as matrix material for the development of Flax/PLA composites. The effects of processing parameters such as fiber volume fraction ranging from 25% to 50% and molding temperature ranging from 160°C to 180°C on mechanical properties of flax/PLA composites were investigated. It is concluded from the results that maximum tensile and flexural strength are recorded at 35% fiber volume fraction of flax/PLA composites developed at 170°C molding temperature. SEM analysis validated the findings obtained from the mechanical characterization.

In the present study, the main focus is to increase the interfacial bonding between jute fiber wi... more In the present study, the main focus is to increase the interfacial bonding between jute fiber with polylactic acid (PLA) with the help of surface modifications of jute fiber using alkali, potassium permanganate, and potassium dichromate treatments. FTIR spectroscopy result confirms the removal of hemicellulose layer which results in an increase in adhesion of jute fiber with polylactic acid. Jute/PLA composites are prepared using hot compression molding process using treated jute fibers and PLA matrix. This study also exposes the effect on the mechanical properties of developed composites of molding temperatures ranging from 160 to 180 °C. Alkali treatments resulted in an increase of 56.1% and 51%, respectively, in the tensile and flexural strength of jute/PLA composites It is so observed that for alkali-treated jute/PLA composite with 170 °C molding temperature, maximum tensile and flexural strength were recorded.

International Journal of Machining and Machinability of Materials, 2012

Wire electrical discharge machining (WEDM) has been used widely for the manufacturing of dies, mo... more Wire electrical discharge machining (WEDM) has been used widely for the manufacturing of dies, moulds, punches and machine parts. The machining performance is affected by process parameters and type of wire electrode used. Increased cutting speed and improved accuracy can be realised in terms of high performance wire electrodes. The purpose of this study is to investigate the effect of cryogenic treated brass wire electrode on surface roughness and material removal rate for WEDM. This paper describes the influence of various machining parameters (including pulse width, time between two pulses, wire tension and wire feed) on surface roughness and material removal rate by using one variable at a time approach. Improvement in surface roughness was observed for lower values of pulse width and higher values of time between two pulses. Under same conditions, deep and shallow cryogenic treated wire electrodes shows significant improvement in machining rate over untreated wire electrodes.

Indian Journal of Engineering and Materials Sciences, 2006

Electrical discharge machining (EDM) is widely used in the production of dies. This paper describ... more Electrical discharge machining (EDM) is widely used in the production of dies. This paper describes an investigation into the optimization of the EDM process when silicon powder is suspended into the dielectric fluid of EDM. Taguchi’s method with multiple performance characteristics has been adopted to obtain an overall utility value that represents the overall performance of powder mixed EDM (PMEDM). The four input process parameters, viz., concentration of silicon powder added into the dielectric fluid, peak current, pulse duration and duty cycle, are optimized with consideration of multiple performance characteristics including machining rate (MR), surface roughness (SR) and tool wear rate (TWR). A modified powder mixed dielectric circulation system has been developed. Experiments have been performed on the newly designed experimental set-up developed in the laboratory. The obtained experimental results indicate that the peak current and concentration of the silicon powder suspen...

Electrical discharge machining (EDM) with a travelling wire electrode has become one of the most ... more Electrical discharge machining (EDM) with a travelling wire electrode has become one of the most dynamic fields in metal working. Manufacturing advances in Electrical discharge machining (EDM) wires have directly contributed to increased cutting speed and dimensional accuracy. This paper focuses on the developments of EDM wire from copper to brass and from brass to various coated wire, which has helped make wire EDM machining, the method of choice for high-speed production as well as applications requiring improved contour accuracy and improved surface finishes. Some of the characteristics of high performance wire electrodes have been presented, which significantly increase the wire electrical discharge machining productivity.

The magnetic abrasives play a vital role as cutting tool in the performance of magnetic abrasive ... more The magnetic abrasives play a vital role as cutting tool in the performance of magnetic abrasive finishing (MAF) process. In this paper, a comparison has been made between the performance and characteristics of magnetic abrasives prepared by a newly developed technique (Mechanical alloying) and a common technique (Sintering). Mechanical alloying and sintering process have been used to prepare magnetic abrasives having 15% SiC and 85% Fe as constituent powders. An experimental set up was developed for the conduct of experimental work. The experiments were conducted to examine the effect of mesh size of magnetic abrasives and machining time on the performance when MAF is done on Stainless Steel 304 with sintered magnetic (SM) abrasives and mechanically alloyed magnetic (MAM). The amount of lubricant, rotational speed of work piece, magnetic flux density and quantity of magnetic abrasives and initial surface roughness of the tube surface were taken as constant parameters. The performan...

Asian Journal of Engineering and Applied Technology, 2021

Global warming, diminution of fossil fuels, escalating oil price’s are the major reasons which fo... more Global warming, diminution of fossil fuels, escalating oil price’s are the major reasons which forces the researchers to develop green products for the sustainable development. In this research work, green composites have been developed with jute fibers as reinforcement and poly lactic acid as matrix material using compression moulding technique. All composites were developed with maintaining the reinforcement as 30% fiber volume fraction. The influence of curing temperature with the range of 160°C, 170°C and 180°C was investigated for various mechanical properties of developed composites and degradation behaviour of developed composites were analysed using soil burial test. Results acquired from the tests specify that the tensile and flexural strength decreases with upsurge in curing temperature. Morphology study using scanning electron microscopy is further justified the findings obtained from mechanical tests. Biodegradation study was done on the all the three different composite...

The present research work focuses on simultaneous optimization of prime energy consumption respon... more The present research work focuses on simultaneous optimization of prime energy consumption responses, surface roughness and material removal rate for sustainable machining operations. The experiments were conducted on rough turning of EN 353 alloy steel with multi-layer coated tungsten carbide insert. The effect of input parameters: nose radius, cutting speed, feed rate and depth of cut along with their interactions were studied on the response parameters viz. power factor (PF), active power consumed by the machine (APCM), active energy consumed by the machine (AECM), energy efficiency (EE), surface roughness (Ra) and material removal rate (MRR). The Taguchi’s L27 orthogonal array had been used for design of experiments by using Minitab 16 software. The weights of importance to the responses were assigned by Equal, Analytical Hierarchy Process (AHP) and Entropy weights method. The multi performance composite index (MPCI) was obtained by Technique for Order Preference by Similarity t...

Magnetic abrasives play a significant role in micro finishing processes like Magnetic Abrasive Fi... more Magnetic abrasives play a significant role in micro finishing processes like Magnetic Abrasive Finishing. The magnetic abrasive should have essential properties like cutting ability and some degree of ferro-magnetism. The present book focuses on the use of microwaves in a well known technique called sintering so as to efficiently manufacture the magnetic abrasives. The text given in the book is based on the research results of a masters level thesis submitted in mechanical engineering department of Guru Nanak Dev Engg College Ludhiana, India. The idea explored in the book may be very useful for researchers engaged in the field of micro finishing of surfaces

Materials and Manufacturing Processes

ABSTRACT Machining of difficult to cut materials at advanced range of machining variable is the r... more ABSTRACT Machining of difficult to cut materials at advanced range of machining variable is the requirement of industry 4.0 for achieving sustainable machining goals taking into consideration energy, ecology and economy. However, due to lack of information on the machining data the material is regarded as difficult to cut. Therefore, to enhance the machining performance of Hastelloy C-276 the experimental investigations have been conducted at different levels of input parameters using CNMG120408 cutting inserts under various cooling conditions. The RSM-based CCD approach has been used to to generate the design of experiment along with ANOVA analysis for finding the influence of input factors on the output signal. Investigations results exhibited that the less cutting temperature, better surface quality and lower chip reduction coefficient have been reported in vegetable oil MQL machining. Research pointed out that the S.R. is influenced by cutting speed, doc, cooling environments and feed rate; likewise the impact has been reported for cutting temperature, while the CRC is less dominated by doc compared to other parameter. The percentage errors evaluated for S.R, temperature and CRC have been reported as 0.53%, −1.52% and 1.81% indicates the significance of developed model.

Materials Today: Proceedings

Machining Science and Technology

Abstract The advanced ceramics have emerged as a successful alternative to the conventional mater... more Abstract The advanced ceramics have emerged as a successful alternative to the conventional materials used in ball bearing industry. However, extreme hardness and lower toughness of the ceramic balls make their finishing a challenging task. To address this problem, a novel process is developed and results are presented in this article. The process is termed as magnetically assisted lapping (MAL) wherein the lapping and the polishing action are supported by magnetic levitation. The process parameters are identified. The capability of the process in terms of surface finish, roundness and material removal rate of alumina balls is assessed. The process is carried out in two stages. In the first stage, the main focus is on material removal and sphericity while the second stage focuses on achieving nano level surface finish. A very high material removal rate of 2.5 µm/min is achieved in the first stage. In the second stage, diamond abrasive powder (0.25–1 µm) mixed with silicone oil is used as a polishing medium for fine finishing of balls. The final surface finish of 20 nm and roundness of 0.23 µm is achieved which meets the requirement of G10 grade bearings (as per ISO3290). Atomic force microscope images show remarkable improvement of the surface up to 8 nm. The developed process is capable of producing nanometric finish in quite lesser time as compared to conventional and eccentric lapping processes. The underlying mechanism of material removal is proposed with the help of scanning electron microscope and atomic force microscope images.

Construction and Building Materials

Abstract To find the possibility of reducing the solid waste from earth, a new composite has been... more Abstract To find the possibility of reducing the solid waste from earth, a new composite has been developed entirely from waste. Recycled PET (polyethylene terephthalate) resin (as binder) with fly ash, red mud and silica fume has been manually mixed, molded and cured for final fabrication. The composites have been characterized mechanically. Estimated using Taguchi, for the specimens cured for 420 days, upon increasing PET resin content from 25% to 35%, the compressive strength, flexural strength and indirect tensile strength have been increased by 10.2%, 11.8% and 9.9% respectively. Waste materials have collectively reduced the water absorption. Red mud and silica fume have increased the acid resistance. High amount of PET resin developed high damping capacity.

Proceedings of the Institution of Mechanical Engineers, Part B: Journal of Engineering Manufacture, 2012

In a wire electrical-discharge machining process an electrically conductive workpiece is eroded a... more In a wire electrical-discharge machining process an electrically conductive workpiece is eroded ahead of a continuous moving wire by spark discharges, which are identical with those in conventional electrical-discharge machining. With wire electrical-discharge machining, convoluted shapes can be cut with a high degree of dimensional accuracy and good surface finish. The machining efficiency of wire electrical-discharge machining can be significantly improved by an adaptive adjustment of various machining parameters, such as, pulse width, pulse interval, dielectric fluid pressure, wire tension, servo reference voltage, etc. Improving the productivities of dies and achieving high-quality workpieces demand is expanding for high-performance wire electrodes. A considerable amount of research on development of wire electrodes for wire electrical-discharge machining has explored high-performance wires for high-speed and high-precision machining. This article reviews the evolution of electr...

International Journal of Machine Tools and …, 2002

... Przyklenk [12] conducted parametric studies of AFM. ... The reasons for developing a hybridma... more ... Przyklenk [12] conducted parametric studies of AFM. ... The reasons for developing a hybridmachining process are to make use of combined or mutually enhanced advantages and to avoid or reduce some of the adverse effects the constituent processes produce when ...

Powder Metallurgy Progress

Magnetic abrasive flow finishing (MAFF) is an unconventional process capable of producing fine fi... more Magnetic abrasive flow finishing (MAFF) is an unconventional process capable of producing fine finishing with machining forces controlled by a magnetic field. This process can be utilized for hard to achieve inner surfaces through the activity of extrusion pressure, combined with abrasion activity of a magnetic abrasive powder (MAP) in a polymeric medium. MAP is the key component in securing systematic removal of material and a decent surface finish in MAFF. The research background disclosed various methods such as sintering, adhesive based, mechanical alloying, plasma based, chemical, etc. for the production of bonded MAP. This investigation proposes bonded MAP produced by mechanical alloying followed by heat treatment. The experiments have been conducted on aluminum tubes to investigate the influence of different parameters like magnetic field density, extrusion pressure and number of working cycles. The bonded magnetic abrasive powder used in MAFF is very effective to finish tube...

Energies

Increasing the energy efficiency of machining operations can contribute to more sustainable manuf... more Increasing the energy efficiency of machining operations can contribute to more sustainable manufacturing. Therefore, there is a necessity to investigate, evaluate, and optimize the energy consumed during machining operations. The research highlights a method employed to prioritize the most energy-intensive machining operation and highlights the significance of electric parameters as predictors in power estimation of machining operations. Multi regression modeling with standardized regression weights was used to identify significant power quality predictors for active power evaluation for machining operations. The absolute error and the relative error both decreased when the active power was measured by the power analyzer for each of the identified machining operations, compared to the standard power equation and that obtained from the modeled regression equations. Furthermore, to determine energy-intensive machining operation, a hybrid decision-making technique based on TOPSIS (a t...

International Journal of Environmental Research and Public Health

The use of dental hand pieces endanger dentists to vibration exposure as they are subjected to ve... more The use of dental hand pieces endanger dentists to vibration exposure as they are subjected to very high amplitude and vibration frequency. This paper has envisaged a comparative analysis of vibration amplitudes and transmissibility during idling and drilling with micro motor (MM) and air-turbine (AT) hand pieces. The study aims to identify the mean difference in vibration amplitudes during idling, explore different grasp forces while drilling with irrigant injection by the dentist, and various vibration transmission of these hand pieces. The study utilized 22 separate frequency resonances on two new and eight used MMs and two new and eight used ATs of different brands by observing the investigator at 16 different dentist clinics. The study adopted a descriptive research design with non–probability sampling techniques for selecting dentists and hand pieces. Statistical methods like Levene Test of Homogeneity, Welch ANOVA, independent t-test, and Games–Howell test were utilized with ...