Papers by kawthar yahya aldulaimi
Journal of Friction and Wear, 2019
The study investigates the thermal and tribological characteristics of an uncoated P10 carbide to... more The study investigates the thermal and tribological characteristics of an uncoated P10 carbide tool and one coated with titanium carbide. Turning tests were conducted on AISI 1020 steel at four spindle speeds (80, 315, 500, and 800 rpm), two feed rates (0.2 and 0.5 mm/rev), and two cut depths (0.5 and 0. 7 mm). The temperature change at the toolworkpiece interface, flank wear width, lifetime of tools, and roughness of the machined surface were determined. It is shown that the TiC coating significantly reduces temperature rise and flank wear during cutting. The lifetime of coated tools is about four times longer compared to uncoated tools. Coated tools also showed improved surface quality.
Engineering, Technology and Applied Science Research, 2024
Nickel Aluminum Bronze (NAB) alloys display characteristics like superior strength and excellent ... more Nickel Aluminum Bronze (NAB) alloys display characteristics like superior strength and excellent wear resistance. In this work, NAB was reinforced using various volume fractions of yttrium (Y 2 O 3) and/or carbon nanotube (CNT) particles prepared using the Powder Metallurgy (PM) method. General full factorial design was used in MiniTab19 software. The experimental results showed a significant influence of the Y 2 O 3 and CNT particles on mechanical and physical properties. The optimal results were recorded for the sample having 6 vol.% of Y 2 O 3 and 1.5 vol.% of CNT. This sample exhibited the highest effect on characteristics with hardness value of 288 Hv, porosity of 10.2%, surface roughness of 0.15 µm, average particle size of 37.55 µm, wear rate of 0.0000313 g/mm, and friction coefficient of 0.68. The results demonstrated that there is an improvement of 64% in microhardness in comparison with the base alloy. Porosity, surface roughness, wear rate, friction coefficient, and average grain size were reduced by 4%, 81%, 71%, 31%, and 24%, respectively.
Academic Journal of Manufacturing Engineering , 2024
Residual stresses significantly influence the integrity and performance of welded structures. Acc... more Residual stresses significantly influence the integrity and performance of welded structures. Accurate measurement and understanding of these residual stresses are essential to ensure the reliability and safety of welded parts. There are several methods used to measure residual stresses in welds, including the Center Hole Drilling (CHD) technique, Deep-Hole Drilling (DHD) technique, Contour method (CM), and Block Removal, Splitting, and Layering (BRSL) technique. Additionally, non-destructive measurement procedures like X-ray diffraction (XRD), neutron diffraction (ND), and synchrotron X-rays are used for analyzing residual stresses in welded components. The wire-cut electrical discharge machining technique is frequently utilized for small, precise cuts. Wire-cut electrical discharge machines are typically used to cut materials with hard structures and delicate geometries. Since this machining method is non-conventional, there is no contact between the tool (wire) and the workpiece, which is its main advantage. This gives it an advantage over other machining procedures and makes the procedure competent for machining even weakly structured and delicate materials. The function of wire electrical discharge machine in cutting has been discussed in this study to measure residual stresses in weldments by the contour method.
International Journal of Innovative Science and Research Technology , 2024
Despite the increased usage of composite materials, high-strength aluminum alloys maintain signif... more Despite the increased usage of composite materials, high-strength aluminum alloys maintain significance in airframe construction. Aluminum's attributes of being lightweight, relatively low-cost, heattreatable, and capable of withstanding high-stress levels contribute to its continued importance. These properties also reduce manufacturing and maintenance costs compared to other high-performance materials. Recent advancements in aluminum aircraft alloys have enabled them to compete effectively with modern composite materials. This study delves into the latest developments, focusing on improving the mechanical properties of aluminum alloys and utilizing high-performance joining techniques. Cu-Al-based alloys represent a new class of functional materials. Due to their unique thermoelastic martensite structure, their exceptional damping performance has garnered attention in materials science and engineering. However, challenges such as elastic anisotropy and larger grain sizes can lead to brittle fractures, impacting the material's mechanical properties. It is widely acknowledged that achieving a finer grain size is pivotal when creating Copper Aluminum alloys with exceptional mechanical attributes and effective damping characteristics. Smaller grain sizes allow for the combined use of fine grain strengthening and interfacial damping, resulting in alloys demonstrating exceptional overall characteristics. This paper presents several standard approaches for preparing Copper Aluminum alloys, subsequently examining research efforts dedicated to enhancing grain size through alloying and heat treatment. Moreover, nanomaterials are being investigated as potential agents for reinforcing Cu-Al-based alloys, leading to substantial improvements in their mechanical characteristics and damping capacities. The study aims to serve as a valuable reference for future research in developing structure-function integrated materials capable of simultaneously offering high strength and high damping characteristics.
test, 2015
In the present study, the nickel aluminide NiAl-based composite, reinforced with yttrium oxide Y2... more In the present study, the nickel aluminide NiAl-based composite, reinforced with yttrium oxide Y2O3 with addition of titanium, was prepared by sintering at 1350 ° C for one and a half hours under an atmosphere of argon gas. Experimental investigation on electrical discharge machining of NiAl composite is performed with a view to correlate the process parameters with the responses for indicating the effect of the alloying addition on the machining performance of NiAl. Electro-discharge machining was used to study the machinability of the prepared composite. The machinability of NiAl was investigated based on the material removal rate, electrode wear rate, white layer thickness, and the surface roughness of the machined samples. The machining tests were performed under a wide range of machining parameters involving the pulse current (Ip) (8, 12, and 20) Amp. , pulse on time (TON) (45, 60, and 80) µsec, and pulse off time (TOFF) (20, 35, and 50) µsec, keeping the other parameters at fixed values. Electro-discharge machining process has been successfully modeled using response surface methodology (RSM) and central composite design (CCD) within "Minitab 17" and model adequacy checking is also carried out. The second-order response models have been validated. Analysis of variance (ANOVA) at constant significance levels of 0.05 was used to predict the most affecting parameters on the machining outputs. Optimization plots indicated that the maximum material removal rate (9.9312 µm) can obtained at (TON = 80 µs, TOFF = 20 µm, and Ip = 17.8182 Amp.), minimum electrode wear rate (0.2552 µm) can achieved at (TON = 45 µs, TOFF = 50 µm, and Ip = 8 Amp.), minimum surface roughness can gained at (TON = 45 µs, TOFF = 50 µm, and Ip = 8 Amp.), and minimum white layer thickness (4.9335 µm) can gotten using machining conditions of (TON = 45 µs, TOFF = 50 µm, and Ip = 8 Amp.
IOP Conference Series: Materials Science and Engineering, 2020
In the present study, the nickel aluminide NiAl-based composite, reinforced with yttrium oxide Y ... more In the present study, the nickel aluminide NiAl-based composite, reinforced with yttrium oxide Y 2 O 3 with addition of titanium, was prepared by sintering at 1350 °C for one and a half hours under argon gas atmosphere. Brinell hardness test was carried out according to (ASTM E140-12b). Titanium addition leads to an increase in hardness of (NiAl-Y 2 O 3) composite. The increase in hardness is mainly due to increased NiAl-Y 2 O 3 mechanical resistance when titanium is added by the solid-state solution strengthening, as well as by the high density (5.7514 g/cm 3) and very low porosity (1.93%) of the final samples. The addition of 2 wt % Ti to the NiAl compound increases the hardness of the compound material (90NiAl-10Y 2 O 3) to 295 HB and then increases to 330 HB by adding 2.5 wt. % Ti and continues to increase to 378 HB by adding (3 wt. % Ti). Wear test is carried out to find the wear characteristics of the composites developed by powder metallurgy route. The results revealed that the addition of titanium leads to a decrease in the wear-rate of NiAl-Y 2 O 3. Addition of 2 wt. % Ti to (70NiAl-30Y 2 O 3) leads to a reduction in adhesion-wear rate from (7.611 * 10-6 g/ cm) to (5.81* 10-6 g/ cm) and to (5.47*10-6 g / cm) by adding 2.5 wt. % Ti. The adhesion-wear ratio continues to decrease to 4.77 * 10-6 g/ cm by adding 3 wt. % Ti.
Al-Qadisiyah Journal For Engineering Sciences, 2016
The present work studied the performance of a carbide tool with a chemical composition of
(65% ... more The present work studied the performance of a carbide tool with a chemical composition of
(65% W, 14 % Ti, 9 % Co and 12 % C). Turning tests were conducted on a workpiece of mild steel
(AISI 1020) using four spindle speeds (80, 315, 500 and 800 rpm), two feed rates (0.2 and 0.5
mm/rev) and two depth of cut (0.5 and 0.7 mm). Taguchi method is a statistical approach to
optimize the process parameters and improve the quality of components that are manufactured. The
objective of this study is using Taguchi method to optimize the machining conditions of a turning
operation such as spindle speed; feed rate and depth of cut. Orthogonal array, signal-to-noise ratio,
and analysis of variance were employed using Mtb14 software to study the performance
characteristics on turning operation represented by the tool life. Accordingly, a suitable mixed
orthogonal array L16 (3×4) was selected. The tool life was measured basing on a maximum flank
wear width of 0.3 mm.Optimum parameter values were obtained and confirmation experiments
were carried out. The analysis results showed that the parameter design of the Taguchi method
provides a simple, systematic, and efficient methodology for optimizing the process parameters.
Only 6.4 % error was recorded. The regression analysis was applied using Datafit ver.9 software.
The results of the analysis showed that the non-linear quadratic polynomial appears to be more
suitable to represent the relation of the spindle speed, feed rate and depth of cut with the tool's wear
life.
key engineering materials, 2022
The sintering at (1.35x10^2) °C for 90 minutes under argon gas atmosphere formed a nickel alumini... more The sintering at (1.35x10^2) °C for 90 minutes under argon gas atmosphere formed a nickel aluminide NiAl-based composite strengthened with yttrium oxide Y2O3 with the addition of cobalt in the current sample. (ASTM E140-12b) was used to perform the Brinell hardness test. The addition of cobalt increases the hardness of the (NiAl-Y2O3) composite. The hardness of NiAl-30Y2O3 composite improved from 341HB to 359HB after 1.5 wt.% Co was added, although the hardness improved to (381-383)HB after 2-2.5 percent Co was added. According to the findings of the wear examination, the inclusion of cobalt decreases the wear intensity of NiAl-30Y2O3, according to the findings of the wear examination. The adhesion wear rate reduces from 7.61 * 10^-6 gr / cm to 6.72 * 10^-6 gr / cm when 1.5 wt. percent Co is added, thus inserting 2-2.5 wt. percent Co reduces the rate to (5.87-5.22)* 10^-6 gr /cm.
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Papers by kawthar yahya aldulaimi
(65% W, 14 % Ti, 9 % Co and 12 % C). Turning tests were conducted on a workpiece of mild steel
(AISI 1020) using four spindle speeds (80, 315, 500 and 800 rpm), two feed rates (0.2 and 0.5
mm/rev) and two depth of cut (0.5 and 0.7 mm). Taguchi method is a statistical approach to
optimize the process parameters and improve the quality of components that are manufactured. The
objective of this study is using Taguchi method to optimize the machining conditions of a turning
operation such as spindle speed; feed rate and depth of cut. Orthogonal array, signal-to-noise ratio,
and analysis of variance were employed using Mtb14 software to study the performance
characteristics on turning operation represented by the tool life. Accordingly, a suitable mixed
orthogonal array L16 (3×4) was selected. The tool life was measured basing on a maximum flank
wear width of 0.3 mm.Optimum parameter values were obtained and confirmation experiments
were carried out. The analysis results showed that the parameter design of the Taguchi method
provides a simple, systematic, and efficient methodology for optimizing the process parameters.
Only 6.4 % error was recorded. The regression analysis was applied using Datafit ver.9 software.
The results of the analysis showed that the non-linear quadratic polynomial appears to be more
suitable to represent the relation of the spindle speed, feed rate and depth of cut with the tool's wear
life.