Journal of Mechanical Engineering <p>Transaction of the Mechanical Engineering Division of the Institition of Engineers, Bangladesh.</p><p>Full text articles available.</p> en-US (IEB) (Md Fahmid Uddin Khondoker) Tue, 23 Apr 2019 00:00:00 +0000 OJS 60 Relationship between environmental manufacturing practices and their competitive outcomes <p>In today’s competitive market providing products only in low cost and high quality is not enough.&nbsp; Environmental concern in manufacturing is also an important issue now. To attract investors and customers&nbsp;organizations need to practice environmental manufacturing. This study is focused to present the relationships&nbsp;between some specific environmental manufacturing practices and their relative specific competitive outcomes in&nbsp;the important and vast industry of garment’s knitting sector in Bangladesh. Although there are several studies on&nbsp;the impact of environmental practices on the organizations outcomes but they are less construable due to many&nbsp;limitations. This study explores the environmental manufacturing practices under two categories pollution&nbsp;prevention and product stewardship and shows their relative competitive outcomes and establishes the relation&nbsp;between them. Based on the surveys and research it is found that some competitive outcomes are positively&nbsp;affected by some of the practices. These findings are believed to motivate the companies to turn towards the green&nbsp;manufacturing.</p> Syed Misbah Uddin, Chowdury M. L. Rahman, Nahian Ismail Chowdhury, Md. Parvez Shaikh, Fayeq Al-Amin ##submission.copyrightStatement## Tue, 23 Apr 2019 09:30:46 +0000 Effect of Fe, Ni and Cr on the corrosion behaviour of hypereutectic Al-Si automotive alloy in 3.5% NaCl solution at different temperature and velocity <p>The main focus of this study is to examine and evaluate the effect of Fe, Ni and Cr on the corrosion&nbsp;behaviour of hypereutectic Al-Si automotive alloy in 3.5% NaCl solution. Experimental information are attained&nbsp;using conventional gravimetric measurements under different solution temperature and velocity and&nbsp;complemented by resistivity, optical micrograph, scanning electron microscopy (SEM) and X-ray analyzer (EDX)&nbsp;investigations. All the alloys show the negative corrosion rate due to formation of a very thin film of aluminum&nbsp;oxide and hydroxid on the surface. Intermetallic particles in the alloys play a major role in passivity.</p> <p>Temperature&nbsp;accelerates the corrosion and the higher velocity breakdown of the passive film. It also affects the resistivity of the&nbsp;alloys. The results from this study also indicate that the temperature and velocity increase the negative corrosion&nbsp;rate of the alloys due to higher rate of chemical reactions. SEM and EDX analysis indicate that the surfaces&nbsp;compose with a thin layer of aluminum oxide and hydroxide corrosion products.</p> M. S. Kaiser, S. H. Sabbir, M. Rahman, M. S. Kabir, M. Al Nur ##submission.copyrightStatement## Tue, 23 Apr 2019 09:54:57 +0000 Investigations for In-house prepared Biocompatible Feed Stock Filament of Fused Deposition Modelling: A Process Capability study <p>Fused deposition modelling (FDM) is one of the low cost additive manufacturing (AM) process. The&nbsp;feed stock filament of FDM is the only consumable in the process and by preparing (in-house) bio compatible&nbsp;feed stock filament the application domain can be increased. Some studies have reported the use of twin screw&nbsp;extrusion (TSE) process for preparation of bio compatible feed stock filament (comprising of polyvinyl chloride&nbsp;(PVC) and polypropylene (PP) and hydroxyapatite (HAp) particles) with improved mechanical, dimensional and&nbsp;thermal properties, for commercial FDM setup. But hitherto very less has been reported on process capability of&nbsp;in-house prepared biocompatible feed stock filament. In the present work statistical analysis (for tensile&nbsp;strength, hardness and dimensional accuracy) has been performed for investigations of process capability. The&nbsp;results have been also supported by control charts (X-chart and R-chart) based upon the best feedstock filament&nbsp;wire.</p> Nishant Ranjan, Rupinder Singh, IPS Ahuja ##submission.copyrightStatement## Tue, 23 Apr 2019 10:10:52 +0000 Effect of rolling on the fractional recrystallization behaviour of Al-Mg and Al-Mg-Zr alloys <p>One set of Al–Mg and Al-Mg-Zr alloys are directly cold rolled and other set of those alloys are hot rolled&nbsp;and then cold rolled using a laboratory rolling mill. The effect of rolling on the fractional recrystallization of the&nbsp;alloys has been investigated using the micro-hardness variation. Isothermally annealed samples are also studied&nbsp;using JMAK type analysis to see if there exists any correlation between experimental and JMAK type analysis.&nbsp;From the microstructure, it is observed that the Al-Mg alloy becomes almost fully recrystallized state after&nbsp;annealing at 600°K for 60 minutes. The results also show that recrystallization fraction obtained by the two&nbsp;methods, shows the higher variation in zirconium added Al-Mg alloy as compared to the Al-Mg alloy. The&nbsp;fractional recrystallization of the cold rolled Al-Mg-Zr alloy is significantly lower than that of cold rolled Al-Mg&nbsp;alloy and hot and colled rolled Al-Mg-Zr, owing to the presence of fine Al<sub>3</sub>Zr precipitates. These metastable L1<sub>2</sub>&nbsp;Al<sub>3</sub>Zr precipitates are thermally stable at high annealing temperatures.</p> M. S. Kaiser, K. M. Shorowordi, H. M. Mamun Al Rashed ##submission.copyrightStatement## Tue, 23 Apr 2019 10:26:29 +0000 Lean Implementation: The Progress and the future challenges of Apparel Industry to achieve the Manufacturing Competitiveness <p>Apparel industry plays an important role in the economic and social development of Bangladesh. This is&nbsp;now a multi-billion dollar manufacturing and export industry in Bangladesh. Its contribution to the foreign&nbsp;exchange earnings, poverty alleviation through creating employment opportunities and empowerment of women is&nbsp;remarkable. However, global competition and unstable market conditions prompted manufacturers to review their&nbsp;traditional manufacturing strategy. In today’s competitive business world, manufacturers are using Lean&nbsp;Manufacturing (LM) technique in order to improve performance and competitiveness. Lean Manufacturing (LM) is&nbsp;a holistic and sustainable approach of manufacturing system used for creating value for customers through&nbsp;eliminating waste in the manufacturing processes. This conceptual paper addresses the concept of lean&nbsp;manufacturing, its benefits and the challenges of implementing lean manufacturing.</p> Abul Bashar, M. Ahsan Akhtar Hasin ##submission.copyrightStatement## Tue, 23 Apr 2019 10:38:55 +0000 Friction Stir Welding of Aerospace Alloys <p>Friction Stir Welding (FSW) is a solid state joining process which possesses a great potential to&nbsp;revolutionise the aerospace industries. Distinctive materials are selected as aerospace alloys to withstand higher&nbsp;temperature and loads. Sometimes these alloys are difficult to join by a conventional welding process but they are&nbsp;easily welded by FSW process. The FSW process in aerospace applications can be used for: aviation for fuel&nbsp;tanks, repair of faulty welds, cryogenic fuel tanks for space vehicles. Eclipse Aviation, for example, has reported&nbsp;dramatic production cost reductions with FSW when compared to other joining technologies. This paper will&nbsp;discuss about the mechanical and microstructure properties of various aerospace alloys which are joined by FSW&nbsp;process.</p> Akshansh Mishra, Devarrishi Dixit ##submission.copyrightStatement## Tue, 23 Apr 2019 10:52:44 +0000