جامعة بلاد الرافدين - Bilad Alrafidain University - prof. dr. Khansaa Dawood Salman

أ.د.خنساء داود سلمان

prof. dr. Khansaa Dawood Salman

تدريسي : هندسة تقنيات الطيران

Teaching : DEPARTMENT OF AERONAUTICAL ENGINEERING TECHNIQUES

دكتوراه هندسة ميكانيك /معادن

PhD in Mechanical/Metallurgical Engineering

dr.khansaa@bauc14.edu.iq

dr.khansaa@bauc14.edu.iq

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Research

	2024	AIP Conference Proceedings
In this research, the influence of ZnO wt.% on the microstructure analysis and mechanical properties of epoxy was investigated. The nanocomposites consist of epoxy resin as a matrix combined with different weight ratios of ZnO (0, 1, 2, 3, 4, and 5wt.%) as a reinforcing material. Ultrasonication was used to disperse ZnO nanoparticles in the epoxy resin. The specimenssome of the nanocomposites manufactured by the casting route. The epoxy was carefully mixed with the additive ZnO nanoparticles in a sonication for 30 minutes before being put into silicon molds. Field Emission Scanning Electron Microscopy (FESEM), Fourier-Transform Infrared Radiation (FTIR), and X-ray diffraction spectra were used to investigate the structural and morphological properties of the preparing specimens and the distribution of ZnO nanoparticles into epoxy resin. Three types of mechanical tests (flexural test, hardness shore (D) and tensile test were conducted on the specimens conforms to ASTM specifications, at room temperature. The results of this work demonstrated that 5wt.% of ZnO nanoparticles had the best mechanical properties compared to net epoxy, except for young᾽s modulus, where the highest percentage was obtained at 3wt.% weight of ZnO nanoparticles, due to the agglomeration of ZnO nanoparticles in epoxy resin above 3wt.%.

	2024	AIP Conference Proceedings
This work aims to study the microstructure and mechanical properties of epoxy matrix incorporated with different amount of ZnO at (1wt.%, 2wt.%, 3wt.%, 4wt.% and 5wt.%) with constant amount of Gr at 1wt.%. Dispersion of ZnO and Gr in the epoxy resin was conducted by ultrasonication device. (Epoxy/ZnO+Gr) nanocomposites samples were prepared by casting route. Field Emission Scanning Electron Microscopy (FESEM), X-ray diffraction spectra (XRD) and Fourier Transform Infrared Radiation (FTIR) were used to describe the structural and morphological properties of the prepared the distribution and samples of nanomaterials into the epoxy resin. Mechanical tests (tensile, flexural and hardness shore (D)) were conducted according to ASTM standards. The results indicated that reinforcement at 5wt.% of ZnO nanoparticles and constant amount of Gr at 1wt.% increases comparing pure epoxy and nanocomposites’ mechanical propertie. While the flexural strength decreased at 5 wt.%, this is due to agglomeration of the additives Using nanoparticles in epoxy resin 4 wt.%.

	2024	AIP Conference Proceeedings
The aim of this study is to investigate the mechanical characteristics and microstructural characteristics of aluminum matrix with varying concentrations of ZnO (3, 6, 9, 12, 15) wt.%. The Al/ZnO nanocomposite specimens were prepared by powdered metalworking. Due to their high strength, wear resistance, and low weight, aluminum matrix nanocomposites (AMNCs) are crucial alloys for various applications, including automotive, electronics, and aerospace. The specimens used in this study were subjected to a variety of tests, such as X-Ray Diffraction (XRD) analysis and Field Emission Scanning Electron Microscopy (FESEM), to determine the microstructure and phases of the nanocomposites. Additionally, mechanical tests such as compressive, wear, and micro-hardness tests were performed. By using FESEM and XRD analysis, the findings of this study demonstrate that ZnO nanoparticles have been uniformly dispersed in the Al matrix. Although mechanical testing indicate that increasing compressive strength at 15%, the highest microhardness at 15wt.% and also improving wear rate. The aims of this work is evaluation the mechanical properties of nanocomposites materials when they mixing the materials is ZnO and AL matrix. Aluminum matrix composites have shown a wide field of industrial applications. Many advantages offered by aluminum matrix composites involve economic (low energy and low cost), environment (low airbome fallouts) and performance (improving rate of productions). However, the applications of AMCs depend on the characteristics of reinforcement material and the technique of manufacturing. Aluminum matrix composites reinforced by oxides such as Al2O3, carbides such as TiC or B4C, Nitrides such as TiN have been used for thermally applications such as aerospace and rotating bldes of helicopters. Also, used for automotive, cam shafts and arm of automobiles. Aluminum matrix composites used in sporting which involves golf clubs, frames of bicycle and skating shoes. The increment of ceramic concentration in aluminum matrix made it suitable in electrical applications such as microprocessors in electronics [1].

	2023	applied sciences
Objective: The aim of the present work is to study the microstructure, wear behavior, physical properties, and micro-hardness of the aluminum matrix AA6061 reinforced with TiC and B4C nanoparticles with different concentrations of 2.5, 5, 7.5, 10, and 12.5 wt.%. Methodology: Al/B4C and Al/TiC nanocomposites were fabricated with a powder metallurgy route. A dry sliding wear test was performed with a pin-on-disc machine. The wear test was performed at the applied loads of 3, 6, 9, 12, and 15 N at a constant time for about 10 min. The microstructural analysis of the fabricated nanocomposites was examined via field emission scanning electron microscopy (FESEM) and X-ray diffraction (XRD) analysis. The obtained data: The results of this work show that increasing the applied load leads to a decrease in the wear rate of the aluminum matrix and its nanocomposites. The wear rate of the aluminum matrix without any additives is about 7.25 × 10−7 (g/cm), while for Al/TiC and Al/B4C, it is 5.1 × 10−7 (g/cm) and 4.21 × 10−7 (g/cm), respectively. An increment in B4C percent increases the actual density, while an increment in TiC percent minimizes the actual density at 2.90 g/cm3 and 2.51 g/cm3, respectively. An increment in B4C percent decreases by 4.61%, while the porosity slightly increases with increases in TiC percent of 6.2%. Finally, the micro-hardness for Al/B4C is about 92 (HRC), and for Al/TiC, it is about 87.4 (HRC). Originality: In the present work, nanocomposites were fabricated using a powder metallurgy route. Fabricated nanocomposites are important in engineering industries owing to their excellent wear resistance, low thermal distortion, and light weight compared with other nanocomposites. On the other hand, Al/B4C and Al/TiC nanocomposites fabricated with a powder metallurgy route have not previously been investigated in a comparative study. Therefore, an investigation into these nanocomposites was performed.

	2024	Engineering and Technology Journal
This study presents the design and implementation of a control system for a Pin-on-Disc wear testing machine using a Programmable Logic Controller (PLC). The novel approach employed involves adjusting the applied pressure on the pin, rather than the conventional method of altering weights, to evaluate the impact of varying loads on the wear rate. This method enhanced the accuracy of wear results by 25% compared to traditional techniques. The control system was developed and implemented with a Human-Machine Interface (HMI) that interacts with the PLC to control and monitor key parameters, including applied load, temperature, rotational speed, sliding time, and friction force. Key wear parameters such as the coefficient of friction (COF), wear rate, and temperature were calculated. The wear tests were conducted under varying conditions, with rotational speeds ranging from 300 to 900 rpm, applied loads from 5 to 25 N, and sliding times from 5 to 25 minutes. The results indicated that an increase in applied load led to higher wear rates and temperatures, while the COF decreased. Conversely, an increase in rotational speed reduced the wear rate but increased both the COF and temperature. Prolonged sliding time resulted in higher wear rates and temperatures, while the COF decreased. Additionally, it was observed that the wear rate of the aluminum alloy AA6061 was higher than that of the CK45 steel alloy. The study utilized various software tools, including AutoCAD 2018, SoMove AC Drive Software, EcoStruxure Machine V1.2 VP1, Vijeo Designer 6.2, Ifs – Conf RTD, and MATLAB.

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