Papers by Prof. Dr. Mohammad Pervez Pervez Mughal
Advances in Intelligent Systems and Computing, 2018
The Textile Industry is the biggest manufacturing Industry at Pakistan that has great notoriety i... more The Textile Industry is the biggest manufacturing Industry at Pakistan that has great notoriety in global businesses. Alike lots of other organizations, job stress has become a major concern in textile organizations as well. The goal of this study is to identify effects of stress among managers belonging to lower and middle level of textile sector organizations. In this cross-sectional study, information was gathered from 125 participants. Exploratory factor analysis was deployed and five components, namely: Physical, Psychological, Behavioral, Performance, and Physiological were identified as the areas where stress is impacting the managers of textile industry. ‘Internal Consistency’ for the components is around 0.7 through beyond 0.8 whereas ‘Total Variance Explained’ by the components is above 72% with ‘Physical’ being more significant. In order to affluence the circumstances, organizations are obliged to deploy interventions for prevention and control of the job stress among their employees in order to assure their wellbeing.
The International Journal of Advanced Manufacturing Technology, 2022
Advances in Intelligent Systems and Computing, 2017
The goal of the current study is to explore relationships between the antecedents and perceived o... more The goal of the current study is to explore relationships between the antecedents and perceived occupational stress amongst the managers of the textile sector organizations in Pakistan. Sheldon Cohen’s perceived stress scale-10 (PSS-10) was employed to measure the perceived occupational stress level while a self-designed instrument to collect data to identify the antecedents. Data collected was analyzed primarily through exploratory factor analysis (EFA) and the partial least squares structural equation modeling (PLS-SEM). The stress components physical agents at work (β = 0.292, T-value = 2.765, p = 0.006) and social working environment (β = 0.253, T-value = 2.618, p = 0.009) were found as statistically significant antecedents of the occupational stress. Interventions are to be designed and implemented to deal with the situation. The findings of the study will benefit the practitioners and the researchers in carrying out further research and devising and implementing interventions ...
Journal of the Mechanical Behavior of Biomedical Materials, 2021
Micromachines, 2020
To get the maximum heat transfer in real applications, the surface area of the micro-features (mi... more To get the maximum heat transfer in real applications, the surface area of the micro-features (micro-channels) needs to be large as possible. It can be achieved by producing a maximum number of micro-channels per unit area. Since each successive pair of the micro-channels contain an inter-channels fin, therefore the inter-channels fin thickness (IFT) plays a pivotal role in determining the number of micro-channels to be produced in the given area. During machining, the fabrication of deep micro-channels is a challenge. Wire-cut electrical discharge machining (EDM) could be a viable alternative to fabricate deep micro-channels with thin inter-channels fins (higher aspect ratio) resulting in larger surface area. In this research, minimum IFT and the corresponding machining conditions have been sought for producing micro-channels in copper. The other attributes associated with the micro-channels have also been deeply investigated including the inter-channels fin height (IFH), inter-cha...
Materials, 2020
Surface modification is given vital importance in the biomedical industry to cope with surface ti... more Surface modification is given vital importance in the biomedical industry to cope with surface tissue growth problems. Conventionally, basic surface treatment methods are used which include physical and chemical deposition. The major drawbacks associated with these methods are excessive cost and poor adhesion of coating with implant material. To generate a bioactive surface on an implant, electric discharge machining (EDM) is a promising and emerging technology which simultaneously serves as machining and surface modification technique. Besides the surface topology, implant material plays a very important role in surgical applications. From various implant materials, titanium (Ti6Al4V ELI) alloy is the best choice for long-term hard body tissue replacement due to its superior engineering, excellent biocompatibility and antibacterial properties. In this research, EDM’s surface characteristics are explored using Si powder mixed in dielectric on Ti6Al4V ELI. The effect of powder concen...
The International Journal of Advanced Manufacturing Technology, 2019
The novel tool geometry has been fabricated by a tool manufacturer which is termed as “Z Geometry... more The novel tool geometry has been fabricated by a tool manufacturer which is termed as “Z Geometry” having a combination of positive and negative rake angles on a single insert. The term Z-geometry was given to the insert due to its appearance like alphabet “Z” character in its side view. With this special geometry, productivity of Ti-6Al-4V alloy can be increased at elevated feed rate. With this Z geometry, a special type of wiper insert having a flat flank face for robust rubbing action was provided to reduce the surface roughness. The combination of inserts, i.e., Z-geometry and wiper insert, is termed as hybrid geometry. This paper involves the evaluation of tool life, material removed, temperature of the machining zone, and surface roughness during the dry milling of Ti-6Al-4V alloy using hybrid geometry tooling at higher feed rates compared to the literature. Feed rate at four levels (0.30, 0.60, 0.90, 1.20 mm/rev) and depth of cut at two levels (0.50, 0.75 mm) were employed while number of wiper inserts were varied from one to two. Maximum material of 108 cm3 was removed in 20 min at a feed rate of 0.60 mm/rev and 0.50-mm depth of cut. Variation in surface roughness was within 0.20 to 0.50 μm over the course of experimentation irrespective of the variables and tool condition.
International Journal of Adhesion and Adhesives, 2019
Abstract In the present research, efforts are made to optimize the curing process and bonded join... more Abstract In the present research, efforts are made to optimize the curing process and bonded joint strength of aluminum 2024 alloy (Al 2024-T3) using polybenzimidazole (PBI) adhesive. Substrate surfaces were prepared using P120 and P1000 sand papers followed by cleaning with ethanol. Substrate surfaces were also prepared using tri-Sodium phosphate (TSP) and the Forest Product Laboratory (FPL) method. Contact angle measurements of untreated surfaces revealed that ethanol cleaned Al 2024-T3 strips exhibited a water contact angle of 86°. A significant decrease in the water contact angle for Al 2024-T3 was noticed with P1000 sanding followed by TSP treatment. The water contact angle of Al 2024-T3 was reduced from 86° to 52° using a combined surface treatment of P1000 sand paper and TSP solution. Lap shear tests were performed to evaluate the single lap shear strength of PBI bonded Al 2024-T3 joints. A maximum lap shear strength of 11.9 MPa was achieved for samples which had received a combined surface treatment of P1000 sand paper and TSP solution. A lap shear strength of 12.1 MPa was achieved using the FPL treatment method. This lap shear strength is almost similar as attained with TSP treated bonded joints. Therefore, the current work also proved TSP as an effective alternative to the hazardous chromate based FPL method for the surface pre-treatment of Al 2024-T3. Fractured surfaces of adhesive bonded joints revealed both adhesive and cohesive failure.
The International Journal of Advanced Manufacturing Technology, 2019
This work presents the optimization of weld factors for ultrasonic welding of similar thermoplast... more This work presents the optimization of weld factors for ultrasonic welding of similar thermoplastics acrylo-nitrile butadiene styrene (ABS) to ABS (ABS/ABS) and polypropylene (PP) to PP (PP/PP) using Taguchi experimental design (L-8). Energy director (ED) fabricated using injection molding is the protruding part for getting ultrasonic vibrations concentrated at the joint interface. Dimensions of ED were increased, as compared to literature, to investigate its effect on joint quality. In addition to enhanced ED dimensions, it was essential to consider the other weld factors properly leading to parametric optimization of these factors for selected thermoplastics. For both ABS and PP, highest lap shear strength (LSS) was achieved while using triangular (TRI) ED instead of SEMI (semi-circular) ED. In the case of ABS, applied pressure, amplitude, and hold time are found to be the significant factors for maximizing LSS; however, amplitude and weld time are found to be more contributing parameters for weld strength in the case of PP. Significant improvement in the weld strength (LSS) has been achieved after conducting the validation experiments for both ABS and PP, i.e., 31.21 MPa (104% of original ABS shear strength) and 22.36 MPa (319% of original PP shear strength) respectively. Substantial enhancement in LSS has been acquired as compared to previous studies. This improvement was only possible with introducing the new joint design for ultrasonic welding that is an innovative design idea. Furthermore, these huge improvements in LSS were never reported for any other welding process utilizing thermoplastics in literature. Although ABS and PP are ductile, various causes of fracture brittleness are also microscopically studied for both materials.
The International Journal of Advanced Manufacturing Technology, 2018
The development of cladded materials to augment the industrial requirements is grown because of h... more The development of cladded materials to augment the industrial requirements is grown because of having combination of properties in end use applications. However, the real challenge regarding the application of these materials is its machining with reasonable surface finish and accuracy owing to the heterogeneous nature. Therefore, oftenly, thermal cutting process like gas cutting and plasma arc cutting are used, but these processes not only offer poor surface quality but also necessitate additional finishing operations. Wire electric discharge machining (WEDM) process is a viable alternate but the roughness generated on the two surfaces is different as the said process is thermoelectric in nature and both layers of material have different thermoelectric properties. In the current research the cutting performance of WEDM of stainless clad steel has been evaluated with a focus not only to reduce the surface roughness of individual layer but also to minimize the difference as well. The influence of uncommon parameters, such as layer thickness of specific layer, workpiece orientation, pressure ratio, and wire diameter are primarily investigated. Wire diameter and workpiece orientation have proved to be the significant control factors affecting the surface roughness of both the layers, whereas pressure ratio affects the surface roughness of one layer (mild steel). Optimal settings of control factors have been developed using grey relational analysis. The results of confirmatory experiment validates the model as not only the surface roughness of both layers have been decreased, but also the difference comes to be minimal of only about 0.02 μm.
Scripta Metallurgica et Materialia, 1993
The International Journal of Advanced Manufacturing Technology, 2017
Review of the available literature has revealed that limited data has been reported on tool wear ... more Review of the available literature has revealed that limited data has been reported on tool wear pattern of twist drills and hole quality for the case of deep hole drilling of AISI 1045. Considering that AISI 1045 has widespread applications as mould material, this paper presents the findings of an experimental investigation on the performance of highspeed steel twist drills of 10-mm diameter for drilling deep holes with L/D >10 in AISI 1045. It is found that the combination of the lowest spindle speed (200 rpm), feed rate (10 mm/min) and peck depth (3 mm) results in better tool life producing 32 holes. Maintaining the lowest spindle speed and feed rate and an increase in peck depth from 3 to 5 mm deteriorated tool life by~18% due to restricted cooling during the Keywords Deep hole drilling. AISI 1045. High speed steel. Twist drill. Tool wear. Hole quality
The International Journal of Advanced Manufacturing Technology, 2016
This paper reports on the effects of spindle attributed forced vibrations on machinability charac... more This paper reports on the effects of spindle attributed forced vibrations on machinability characteristics of vertical milling process. The effects of three levels of spindle attributed forced vibrations along with feed rate and axial depth of cut are evaluated on surface roughness, dimensional accuracy, and tool wear under constant conditions of radial depth of cut and cutting speed. AISI P20 and solid carbide cutter are used as workpiece material and tool, respectively. Taguchi L9 standard orthogonal array is used for experiments followed by analysis of variance (ANOVA) for identifying significant parameters that affect surface roughness and dimensional accuracy. Tool wear in terms of crater wear (Kt) and tool flank wear (VBmax) is measured along with an analysis of chipping and built-up edges for accessing the influence of forced vibrations. It is found that machine tool vibration amplitude and axial depth of cut are statistically significant at 95 % confidence level for surface roughness, with vibration amplitude being the most contributing factor (83.4 %) followed by axial depth of cut (12.39 %). The dimensional accuracy is found to be insensitive to the parameters at stated confidence level. Higher values of vibration amplitude and feed rate are found to be resulting into excessive tool wear with vibration amplitude of 0.185929 mm/min combined along with a feed rate of 600 mm/min and an axial depth of cut of 0.15 mm resulting in catastrophic tool failure.
Proceedings of the Institution of Mechanical Engineers, Part B: Journal of Engineering Manufacture, 2007
This paper presents a finite element (FE)-based three-dimensional analysis to study the structura... more This paper presents a finite element (FE)-based three-dimensional analysis to study the structural effects of deposition patterns in welding-based layered manufacturing (LM). A commercial finite element software ANSYS is used to simulate the deposition incorporating a double ellipsoidal heat source, material addition, and temperature-dependent material properties. Simulations carried out with various deposition sequences revealed that the thermal and structural effects on the workpiece are different for different patterns. The sequence starting from outside and ending at the centre is identified as the one which produces minimum warpage.
Numerical Heat Transfer, Part A: Applications, 2006
The present study is conducted to simulate the effect of molten metal droplet wettability on the ... more The present study is conducted to simulate the effect of molten metal droplet wettability on the solidification rate of a molten metal droplet. The effect of heat sink size, i.e., the thickness of substrate is also studied with respect to droplet solidification. It is found that the variation of contact angle has significant effect on the solidification time but the
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Papers by Prof. Dr. Mohammad Pervez Pervez Mughal