Mukandar Sekh

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Oludamini Ogunnaike

University of Virginia

Armando Marques-Guedes

UNL - New University of Lisbon

Prof. Dr. Raffaele Pisano, HDR (Habil.)

Université des Sciences et Technologies de Lille (Lille-1)

Abhas Mitra

Homi Bhabha National Institute (HBNI, BARC, MUMBAI)

Christine Sleeter

California State University, Monterey Bay

Harijono Djojodihardjo

Institut Teknologi Bandung

Jonathan D Maltz

Stanford University

Asep Wahyudi

STTA (sekolah tinggi teknologi adisjucipto

Sergey A Khaibrakhmanov

Saint-Petersburg State University

Nikos Mantzakouras

National & Kapodistrian University of Athens

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Papers by Mukandar Sekh

Metal Matrix Composites Processed Through Powder Metallurgy: A Brief Overview

Journal of the institution of engineers (India) Series D/Journal of the institution of engineers (India) series D, Feb 29, 2024

A study on various applications of aluminium metal matrix composites

PHYSICAL MESOMECHANICS OF CONDENSED MATTER: Physical Principles of Multiscale Structure Formation and the Mechanisms of Nonlinear Behavior: MESO2022

Laser surface texturing: A comprehensive review

INTERNATIONAL CONFERENCE ON MECHANICAL MATERIALS AND RENEWABLE ENERGY (ICMMRE 2022)

Impact of Dielectric Conductivity and Other Process Parameters on Machining Characteristics in Wedm of Al 6065 Alloy

Journal of Advanced Manufacturing Systems

Among the wire electrical discharge machining (WEDM) parameters, dielectric conductivity plays a ... more Among the wire electrical discharge machining (WEDM) parameters, dielectric conductivity plays a crucial role to determine the performance characteristics of the process. In this study, the effects of dielectric conductivity and four other significant process parameters such as pulse on time ([Formula: see text], arc on time ([Formula: see text], servo sensitivity ([Formula: see text], and open-circuit voltage ([Formula: see text] on Al 6065 have been investigated. Experimental result shows that maximum cutting speed is obtained at a 10 mho/m dielectric conductivity ([Formula: see text] setting. It is also found that for a broad range of corner error ([Formula: see text] and surface roughness ([Formula: see text] during single-pass cutting operations, 10[Formula: see text]mho/m conductivity settings give the best result. However, to achieve the corner accuracy and a surface finish lower than the critical limit (i.e., [Formula: see text][Formula: see text]mm & [Formula: see text]m), ...

Statistical analysis of process parameters and multi-objective optimization in wire electrical discharge machining of Al 7075 using weight-based constrained algorithm

International Journal on Interactive Design and Manufacturing (IJIDeM)

Rice Husk Ash Reinforced Aluminium Metal Matrix Composites: A Review

Materials Science Forum, Oct 13, 2022

Indigenous Production of Porous 316L through Powder Metallurgy and Investigation of their Mechanical Properties

Key Engineering Materials

Nowadays, 316L stainless steel implant materials exhibit a promising position in the field of bio... more Nowadays, 316L stainless steel implant materials exhibit a promising position in the field of biomaterials application, especially in medical due to their higher strength compared to other ceramic base materials. Therefore, in this work, the production of 316L implant materials and examination of the mechanical characteristics were carried out. Powder Metallurgy process has been chosen to produce the implant materials due to its high advantages in demonstrating the high mechanical properties of the green sample. 316L stainless steel with zinc streate powder of three different compositions, i.e., the first of 99% 316L stainless steel and 1% zinc stearate, the second of 97% 316L stainless steel and 3% zinc streate, and the third of 95% 316L stainless steel and 5% zinc streate, were cold pressed individually at 600 MPa pressure using UTM and sintered the green samples at 1120 °C for 1 hour and 30 minutes. Sintering temperature and time were the same for all the specimens. We investigat...

Modeling and optimization of wire electrical discharge machining of γ-TiAl in trim cutting operation

Journal of Materials Processing Technology, 2008

The prediction of optimal machining conditions for required surface finish and dimensional accura... more The prediction of optimal machining conditions for required surface finish and dimensional accuracy plays a very important role in process planning of wire electrical discharge machining. The present work deals with the features of trim cutting operation of wire electrical discharge machining of γ-titanium aluminide. A second-order mathematical model, in terms of machining parameters, was developed for surface roughness, dimensional

Density, Hardness, and Wear Responses of Rice Husk Ash Reinforced Aluminium Composites

Materials Science Forum

Nowadays, there is an ever-increasing demand for lightweight, robust, and low-cost materials. The... more Nowadays, there is an ever-increasing demand for lightweight, robust, and low-cost materials. The desire for increasingly exotic and superior materials has become unavoidable as science progresses. The manufacturing industry is looking for more complex geometries. For example, composite materials are a sort of innovative material that blends the properties of its constituent materials. One of the most extensively used composite materials is metal matrix composites. Aluminium matrix composites are lightweight, high-performance structural and functional materials used in a variety of industries, including defense, aerospace, automotive, heating systems, and sports and entertainment. It is really good for the environment to use by-products from agricultural sectors, such as rice husk, as reinforcement with MMCs. The purpose of this research is to use powder metallurgy technology to build an aluminum-based composite with rice husk ash (RHA) and evaluate how its properties may be enhance...

IMPROVEMENT OF SURFACE QUALITY OF Ti-6Al-4V ALLOY BY POWDER MIXED ELECTRICAL DISCHARGE MACHINING USING COPPER POWDER

Facta Universitatis, Series: Mechanical Engineering, May 26, 2021

Electrical Discharge Machining (EDM) is one of the most popular nonconventional machining process... more Electrical Discharge Machining (EDM) is one of the most popular nonconventional machining processes that are being used in many high precision manufacturing industries. To increase the EDM performance, a hybrid technique, namely, powder mixed electrical discharge machining (PMEDM) is generally used for getting more precise requirements. In this study, an experimental investigation is carried out in order to explore the machining performance of the PMEDM process on Ti-6Al-4V alloy using copper (Cu) powder in the EDM oil dielectric. Taguchi's L18 orthogonal array design has been utilized for design of experiments and the analysis of variance (ANOVA) has been performed with the help of Minitab-19 software. The optimal parametric setting of Cu powder mixed EDM has been found utilizing the Taguchi-Grey Relational Analysis (GRA) integrated approach and also validation of optimal parametric setting is done through experimentation. It is a novel approach for machining Ti-6Al-4V alloy by this PMEDM technique in which the surface quality has been improved significantly with the addition of suitable amount of Cu powder into the dielectric medium.

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Experimental investigations of wire lag phenomena on wire electrical discharge machining of M2 tool steel

Materials Today: Proceedings, 2021

Abstract A detailed experimental research study on wire lag phenomena, gap force, and wire lag co... more Abstract A detailed experimental research study on wire lag phenomena, gap force, and wire lag compensation has been carried out on M2 tool steel material to overcome the error in dimensional accuracy for circular or curved profile job cutting in the wire electrical discharge machining. The design of experimental planning was made based on Taguchi methodology to determine the effect of the WEDM input control parameters on the wire lag related to different machining criteria, as well as the material removal rate, surface finish characteristic in terms of Ra values, spark gap, and specific energy consumption in this research work. The frequency, pulse on time, peak current, wire feed, workpiece height and wire tension, cutting diameter, and the span in between wire guide and job surface are considered as input control parameters for the present study. Parametric analysis shows that wire lag increases with workpiece height and wire lag compensation value increase rapidly with the decrease of job diameter. Parametric analysis is also carried out for MRR, surface roughness, spark gap, and specific energy consumption for optimum output. A further key finding is identified that the energy utilization efficiently increases with larger height job cutting in the WEDM process.

Measurement and analysis of wire lag for high precision profile generation in Wire Electrical Discharge Machining WEDM

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Comparative study of parametric effects on the performance of simple and powder mixed EDM using aluminium and graphite powder on Inconel X750 alloy

Materials Today: Proceedings, 2021

Abstract In the present scenario, Electrical Discharge Machining (EDM) is one of the most entrenc... more Abstract In the present scenario, Electrical Discharge Machining (EDM) is one of the most entrenched non-conventional machining processes which are widely used in different manufacturing sectors worldwide. Generally, the conductive materials, which having geometrically complex shape and extremely difficult to machine by conventional machining processes are machined by EDM. The further improvement of the machining efficiency of this EDM process may be enhanced by using powder suspended dielectric fluid which is called Powder Mixed EDM (PMEDM) process. In this research work, an attempt has been made to analyze the comparative study of parametric effects on the performance characteristics like material removal rate (MRR), tool wear rate (TWR) and surface roughness (SR) in terms of average value of roughness parameter (Ra) of simple (without powder) and powder mixed EDM using Aluminium (Al) and Graphite powder on Inconel X750 alloy by experimental investigation. Here, in our study, Peak current (Ip) pulse on time (Ton) and pulse off time (Toff) have been taken as the variable process parameters and concentration of powder (Cp) is taken as 6 g/l in all cases throughout the experimentation. From the experimental results, it has been observed that PMEDM gives lower MRR but better surface finish in comparison with conventional EDM technique (without powder). Also, it has been noticed that graphite powder mixed EDM is more effective for getting better surface finish of Inconel X750 alloy compared to Al mixed PMEDM process.

Influence of different control strategies in wire electrical discharge machining of varying height job

The International Journal of Advanced Manufacturing Technology, 2016

In this article, the wire electrical discharge machining of different heights of die steel workpi... more In this article, the wire electrical discharge machining of different heights of die steel workpieces has been carried out for different control strategies, i.e. proportional control mode, constant speed mode, constant voltage mode, and constant area feeding mode. It is very crucial to understand the thermo-mechanical aspect of the machining gap during machining of changing job height. For the efficient machining of variable thickness of jobs, these observations are extremely essential. Here, it is observed how job height influences cutting speed, surface roughness, kerf width, gap voltage, gap current, input power, and specific energy consumption under these control strategies. So far, very little research work has been reported in this area. Thus, it is quite imperative to carry out an intensive research study of wire electrical discharge machining (WEDM) during machining of different job thickness under those control strategies. An attempt has been made to understand the nature of variation of these important response parameters. The average and variance of some of the most influential parameters, i.e., cutting speed, surface finish, and kerf width were also calculated. Along with this, to predict the different important response parameters, i.e., cutting speed, surface finish, and kerf width for any given height job under any specified control strategy, regression analysis was carried out.

A novel method of determination of wire lag for enhanced profile accuracy in WEDM

Precision Engineering, 2011

Wire bending due to gap force is a major cause of imprecision in WEDM applications. To achieve hi... more Wire bending due to gap force is a major cause of imprecision in WEDM applications. To achieve higher precision and accuracy the knowledge of gap force and wire lag is extremely essential. In the present research, an in depth study on wire lag phenomenon has been carried out. A novel method to measure gap force intensity and wire lag under any given machining condition has been proposed by developing an analytical model. Experiments were carried out to verify the proposed model. Beside this, the impact of wire deflection on profile accuracy during cutting cylindrical job has been investigated. Based upon the developed analytical model an effective method has been proposed to eliminate this inaccuracy using wire lag compensation technique. The research finding will lead to better understanding of the gap force phenomena and will promote significant development in the domain of high precision WEDM.

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Frictional Behavior of Aluminium MMC Foam Synthesized Using Dual Foaming Agent

International Journal of Surface Engineering and Interdisciplinary Materials Science, 2017

In the present article, an attempt is made to develop aluminium foam indigenously. The experiment... more In the present article, an attempt is made to develop aluminium foam indigenously. The experimental setup for the production of aluminium foam is designed and fabricated. Investigation are made into the use of dual foaming agents (i.e. TiH2 and CaCO3) along with SiC to develop suitable aluminium foams which can be utilized for various engineering products like load-bearing elements, crash resistance elements etc. The process is standardized to produce aluminium foam with specific density with minimum variability. This aluminium foam produced possesses a very low coefficient of friction. This work successfully characterized the frictional properties of the developed material. In order to define the Frictional properties of this material, a mathematical model which uniquely defines the frictional behavior of this modified Al-MMC foam has been developed.

WEDM Machining Performance of Al Based Metal Matrix Composites Reinforced with Rice Husk Ash

by Mukandar Sekh and ZIYAUDDIN SEIKH

<jats:p>With the enhancement in science and technology, necessity of complex shapes in manu... more <jats:p>With the enhancement in science and technology, necessity of complex shapes in manufacturing industries becomes essential for more versatile applications. These lead to demand for light weight and durable materials for applications in aerospace, defence, automotive, as well as sports and thermal management. Due to its high-tech structural, functional applications like defence, automobile, aerospace, thermal sensitive materials. Al-Matrix composites are considered as one of those classes of advanced engineering materials. In the present study, Al-RHA (Rice Husk Ash) composites are prepared by powder metallurgy route using 10% and 15% RHA by weight as reinforcement. Presence of abrasive particles leads to difficulty of conventional machining on Al-RHA composites hence non-conventional machining WEDM (Wire-Electric Discharge Machining) has been investigated. Suitable machining parameters for composites using wire EDM have been tried to get maximum material removal rate and speed. Optimizations of experimental parameters have been studied using Taguchi and Anova to standardize the process parameters for machining. Prime process parameters like servo-voltage, pulse-on time and pulse-off-time have been taken into consideration to study cutting quality of Al-RHA Metal matrix Composite using cutting speed as response parameters while effect of RHA weight fraction addition is also considered for evaluation to understand its influence on affecting the response.</jats:p>

Influence of dielectric conductivity on corner error in wire electrical discharge machining of Al 7075 alloy

by Dipankar Bose and Mukandar Sekh

Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science, 2020

Comprehensive research has been carried out to investigate the effect of electrical conductivity ... more Comprehensive research has been carried out to investigate the effect of electrical conductivity (ĸ) of dielectric along with other process parameters in wire electrical discharge machining (WEDM) of Al 7075 alloy. Taguchi based design using L9 orthogonal array has been used to analyse the effect of open circuit voltage (VOC), pulse on time (TON), pulse frequency (fP) and servo sensitivity (SC) on corner accuracy including different other response criteria. The experimental result shows that dielectric conductivity plays a significant role in respect to corner error and surface finish in a single pass cutting operation. Surface topography and elemental analysis of the machined surface has been carried out for depth understanding of the influence of dielectric conductivity in WEDM. Experimental investigation and subsequent analysis of results showed that for a broad range of response variables (e.g. corner accuracy and surface finish) 12 mho conductivity setting gives the optimum res...

Improvement of Profile Accuracy in WEDM—A Novel Technique

Lecture Notes in Mechanical Engineering, 2020

A thorough investigation on wirelag phenomena was carried out in this study. Here, the effect of ... more A thorough investigation on wirelag phenomena was carried out in this study. Here, the effect of wire deflection or wirelag on geometrical accuracy has been explored. A proper control to improve dimensional accuracy of circular job is achieved here. A novel method is presented to measure the wirelag by geometrical analysis. A mathematical model is developed to measure the gap force. Experimental investigations are performed to verify the proposed model.

Density, hardness and wear responses of aluminium-copper-magnesium alloys

Materials Today: Proceedings, 2021

Currently, alloys are extensively used in industrial applications due to better tribological prop... more Currently, alloys are extensively used in industrial applications due to better tribological properties. There are wide ranges of applications of aluminium based alloys in the field of the Automobile Industry, Defence, etc. The purpose of this work is to fabricate and investigate the enhancement of the properties of the Aluminium-Copper-Magnesium alloy which is manufactured through the powder metallurgy (P/M) process. Although alloy can be fabricated by ingot metallurgy (I/M), the powder metallurgy route offers a cost-saving likened to the ingot metallurgy (I/M) approach for the reason that closer-to-net shape parts can be made and also in ingot metallurgy, where cooling from the molten state is relatively slow, resulting in workability problems and other limitation like segregation defect. In the final product, the fine microstructure can be achieved as powder particles are very small and uniform and hence mechanical properties are enhanced. The experimental design was done using a...