Ph.D

Ph.D In Metallurgical Engineering in the Field of wear of metals and materials and the thesis entitled with “ Study of adhesive wear for different stacking fault energy alloys under dry sliding conditions” under the faculty of Production and Metallurgical Engineering at the University of Technology, Baghdad, Iraq. During 1992 – 10 April 1996.

Ms.C

M.Sc. In production Engineering in the Field of Tribology (Friction, Lubrication and Wear)
and the dissertation entitled with “ Sliding wear of porous surfaces under lubricated conditions” under the faculty of Production and Metallurgical Engineering at the
University of Technology, Baghdad, Iraq. During 1982 – 4 March 1985.

Bs.c

BS.c. In Production Engineering Technology under the faculty of Production and Metallurgical Engineering at the University of Technology, Baghdad, Iraq. During 1979 – 23
June 1982.

B.Sc.

In Computer Science

Administrations of all the Promotions of the college staff [Chairman of the Scientific Promotions Committee / Engineering Technical College/ Mosul]

Chairman of the Committee

Administrations of all the Mechanical Power Department Techniques [Head of the Mechanical Power Department Techniques]

Administrations of all the Mechanical Power Department Techniques

Organizing various scientific courses to raise the efficiency of the university's teaching and technical staff [Continuing Education Center Director of Northern Technical University]

Administrations of all the Continuing Education Center affairs

Comparison of a Medium Carbon Steel Microscopic and Hardness Properties Following Different Heat-Treatments

Journal Annales de Chimie - Science des Matériaux

publisher International Information and Engineering Technology Association

DOI https://doi.org/10.18280/acsm.480613

Issue No. 6

Volume Vol. 48

Abstract: This article investigates how medium carbon steel's microstructure and hardening strength are affected by repeated heat treatment. Finding out the impact of repeatedly heat-treating medium carbon steel is the primary goal of this investigation. In this study, four different heat treatment techniques were used: first quenching, first tempering, second quenching, and second tempering. During the first quenching process, the samples were heated at 870℃ and left in the oven for 45 minutes. The samples were then quenched in distilled water at different temperatures (0, 5, 10, 15, 20℃). The first tempering step, which lasted 25 minutes at 350℃, came after the first quenching step. The samples were heated to 850℃ and placed in the oven for 45 minutes in order to undergo the second quenching process. After that, the samples were quenched at various temperatures (0, 10, 20, and 30℃) in a medium containing distilled water. The second tempering procedure came after the second quenching step, which lasted 25 minutes at 450℃. All samples underwent microscopic inspections and hardness tests following the various heat treatment processes. Each sample's five surface areas underwent hardness testing and microscopy, and the results were compared and analyzed. Research has shown that the steel has undergone various heat treatment procedures, resulting in varying microstructure and hardness values. The hardness of the models that underwent repeated hardening procedures has been shown to significantly increase. In addition, the specimens obtained after the first and second quenching and tempering exhibit a good combination of mechanical properties due to their microstructure. This is because the specimens become more ductile and tough as a result of the quenching and tempering processes, which decrease fragility.

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Effect of Change in Sulfuric Acid Concentrations and Different Temperatures on Corrosion of Heat-Treated Moderate Carbon Steel

Journal Journal of Advanced Research in Fluid Mechanics and Thermal Sciences

publisher SEMARK ILMU PUBLISHING

DOI https://doi.org/10.37934/arfmts.124.1.2127

Issue Issue 1

Volume Volume 124

This study looked at the effects of successive heat treatments (first quenching, first tempering, second quenching, and second tempering) on the corrosion rate of moderate carbon steel in a methodical manner. Using distilled water, the specimens were cooled at 10 oC following the initial quenching and at different temperatures (0, 10, 20, 30 oC) following the second quenching. Based on the results of repeated heat treatment experiments and corrosion rate experiments in these models, the moderate carbon specimens that underwent the heat treatments have a high corrosion resistance compared to the original models (prior to the application of the heat treatments). At different temperatures (298, 303, and 313 K) and concentrations (0.2, 0.3, and 0.4 N–H2SO4), in an acidic moderate. The study also showed that corrosion resistance decreases with concentration and with increasing corrosion-moderate temperature in heat-treated models. Another finding is that the models with the best corrosion resistance were those that underwent a second quench and cooling process. Another finding shows that the models with the highest corrosion resistance were those that experienced a second quench and were cooled in water at zero oxygen content.

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The Effect of Heat Treatment on the Hardness of Medium Carbon Steel

Journal Revue des Composites et des Matériaux Avancés-Journal of Composite and Advanced Materials

publisher International Information and Engineering Technology Association

DOI https://doi.org/10.18280/rcma.340403

Issue No. 4

Volume Vol. 34

When a suitable balance of hardness, strength, and toughness is required in civil engineering and construction, wear-resistant medium carbon steels are frequently utilized. The ability to resist plastic deformation brought on by stress or abrasion is measured by hardness. High hardness materials are typically more brittle and prone to fracture but also stronger and more resistant to corrosion. A double-quenching procedure was used in the current investigation and contrasted with the traditional single-quenching process. Additionally, a variety of cooling media are used during quenching treatments. The results demonstrate that distilled water is the most effective cooling medium to cool the models in the heat treatment of medium carbon steels because it is free of salts, suspended particles, and metal contaminants. The results show that the hardness increased following the first quenching and tempering by 37.5% above the hardness value predicted by the original model, and it increased once more following the second quenching and tempering by 10% over the hardness value following the first heat-treatment. The previous austenite grain limits and the high-angle beam limits are the main factors that give a share in to the increased hardness, and the main elements that affect how effectively they function are the high slip transmission factor and the high spacing angle between slip levels.

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Investigation of the Corrosion of Heating Treatment Medium Carbon Steel in Sulfur Aqueous Solution

Journal Revue des Composites et des Matériaux Avancés-Journal of Composite and Advanced Materials

publisher International Information and Engineering Technology Association

DOI https://doi.org/10.18280/rcma.340302

Issue No. 3

Volume Vol. 34

Abstract: To achieve the necessary mechanical properties and high corrosion resistance, heat treatment is based on a significant alteration in the microstructure of metals and alloys. The metal is heated above a critical temperature during heat treatment processes. Several methods, such as quenching and cooling in various media, followed by tempering and other heat treatment operations, can be used to achieve this. Steel can be made more malleable by annealing, which also increases ductility and improves corrosion resistance. In this study, thirty medium carbon steel specimens were used, which were split into different groups, various heat treatments were applied. First quenching, first tempering, second quenching, and second tempering were among the heat treatment procedures used, and cooling media made of distilled water were used at various temperatures. After that, the corrosion rate in these specimens was looked at, and the results were compared to the corrosion rate in the base specimen. The results show that repeated heat treatment of the metal generally lowers the rate of corrosion in the metal, particularly when distilled water is used for the cooling process after the two tempering stages at a temperature of almost absolute zero. The findings show that the second sample had the lowest corrosion rate of all the samples. When compared to the corrosion rate in the basic sample, the corrosion rate in this sample decreased by about 92.9%.

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Mechanical Property Enhancement of Stainless Steel 12Х18Н10Т Through nc-TiN Coating: A Simulation Study

Journal Annales de Chimie - Science des Matériaux

publisher International Information and Engineering Technology Association

DOI https://doi.org/10.18280/acsm.480203

Issue No. 2

Volume Vol. 48

Abstract: Models for the mechanical testing must be created, and they must be processed at a high cost and take a very long time to finish. for bending, pulling, impact resistance, and other tests. to establish suitable mechanical standards for the application of these materials in the industrial, military, and aviation sectors. In order to gather information on these materials' resistance without requiring specialized laboratories, it was therefore required to test them using specific software, which lowers the expense associated with studying the materials before using them. To use computer simulation to research the impact of nc-TiN coating on the mechanical characteristics of stainless steel 121810T. Finite element models of uncoated and nc-TiN coated stainless steel 12Х18Н10Т were developed. Tensile, bending and impact tests were simulated using the ANSYS program. The coated models showed increased resistance compared to uncoated models in all three tests. The tensile strength, bending force and impact energy of the coated models increased by 30%, 32.67%., and 31.68% respectively. Finite element simulation demonstrated that nc-TiN coating can significantly enhance the mechanical properties of stainless steel 12Х18Н10Т. The virtual testing approach provides a cost-effective way to characterize materials and optimize coating parameters. The most important outcome of this study is the ability of numerical programs to generate mathematical models of models similar to those used in laboratories and workshops to perform various mechanical tests, such as tensile strength, impact resistance, bending resistance, twisting resistance, and other mechanical tests. In addition to describing the behavior of the material under the influence of different loads, this shortens the time it takes to finish industrial and technological projects and lowers the related expenses.

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Effect of the Cross-Sectional Shape on the Dynamic Response of a Cantilever Steel Beam Using Three Modal Analysis Methods

Journal Mathematical Modelling of Engineering Problems

publisher International Information and Engineering Technology Association

DOI https://doi.org/10.18280/mmep.110310

Issue No. 3

Volume Vol. 11

The main method for determining the vibration characteristics of engineering constructions is modal analysis. It's a way of analyzing a system's mode shapes, natural frequencies, and damping factor. The dynamic response of cantilever beams is determined in this work with different cross-sectional shapes to find the effect of eccentricity on the dynamic response of the cantilever beam. The main goal of this research is to find and detect the natural frequencies and mode shapes of a Structural Steel cantilever beam with different eccentricities and to identify flexural or torsional natural frequencies, as well as their mode shapes that could be confused with transverse natural frequencies, and to compare the results with analytical and experimental methodologies. Results showed that torsional natural frequencies remained within the transverse natural frequency. It can be shown that, the increase of eccentricity in the cross section decreases the natural frequencies and especially the torsional natural frequencies. The results were compared experimentally and numerically using ANSYS 16.1 software. There is a strong link between the mathematical, FEA, and experimental results. The latest results can be used to calculate failure loads in a variety of situations. The mathematical application of Euler's Bernoulli's beam concept was applied. The results of the three ways have been declared satisfactory.

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Stress Distribution in Cantilever Beams with Different Hole Shapes: A Numerical Analysis

Journal International Journal of Computational Methods and Experimental Measurements

publisher International Information and Engineering Technology Association

DOI https://doi.org/10.18280/ijcmem.110402

Issue No. 4

Volume Vol. 11

The main duty of engineers is to guarantee that structures are both erect and adhere to codes, which proves their outstanding functionality and economic viability. In today's elastic materials, the von Mises stress values have to be verified when examining fatigue or failure. In the domains of heavy lifting, robotics, mechanical and offshore engineering, oil and gas engineering, and civil engineering, the Von Mises criteria are among the most often used benchmarks for assessing productivity conditions. In this study, seven I-beams models will be built, the first model without holes and the other six models with holes in various shapes (square, triangular, circular, hexagonal, and rectangular). The ANSYS program will be used to solve it using the finite element method. For the upper surface of these models, equal loads will be applied. The findings demonstrate that the shear stress values for the seven models were less than the shear stress values of the metal, which came to (370MPa), in line with the theory of maximum shear stress. With a value of (62.7MPa), the second-best model was the best. One of the most important conclusions when comparing the values of von Mess stresses with the von Mess theory of stress is that the third model (with rectangular openings) performed better than the other models when compared to the first model because its value was the same in both models (370MPa). The seventh model (hexagonal holes) had the lowest maximum value of stress intensity at 261MPa, per the results. being aware that this model weighs (70Kg) less than the first.

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Finding the Weight Difference of a Rectangular Structure with a Parabolic Arc for Mathematical Models Made of Steel and other Composite Materials

Journal WSEAS TRANSACTIONS on APPLIED and THEORETICAL MECHANICS

publisher WSEAS TRANSACTIONS on APPLIED and THEORETICAL MECHANICS

DOI DOI: 10.37394/232011.2023.18.17

Issue Volume 18

Volume Volume 18

Abstract: - The most popular materials for lightweight constructions, including building and aircraft structures, industrial, military, and aerospace technology, are armored composites. Composites made of carbon fiber are typically employed in lightweight applications. The ANSYS program was used to produce four mathematical models. Steel is used in the construction of the first and second versions whereas composite materials are used in the third and fourth variants. To find all the deformations, stresses, and strains that appear on the four models, as well as to calculate the weights of those four structures and compare them, these four models were tested with the ANSYS 15.0 program to obtain equal deformation resistance for all models under the influence of different loads. The results show that the composite models had lower strains, stresses, and deformations than the steel models. Among other results, it was discovered that the weight of the third model made of composite materials decreased by (32.72%) compared to the steel-based first model, and after doing the necessary calculations and assessing the results, the fourth model made

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The Influence of Repeated Heat Treatments on The Propagation of Fatigue Cracking of Medium Carburized Steel

Journal Journal of Mechanical Engineering

publisher Universiti Teknologi MARA (UiTM), Malaysia.

DOI https://doi.org/10.24191/jmeche.v20i3.23920

Issue 3

Volume Vol 20

The issue of metal fatigue emerged as one of the major issues in a variety of engineering designs, and the design engineers were forced to take metals' fatigue resistance into account. In this paper, multiple quenching mediums and varied heat treatments were utilized to examine the effects of various heat treatments on the development of fatigue cracking in steel. The model that was carburized, quenched in distilled water and tempered before being quenched once more in distilled water and tempered a second time had the best outcomes, the fewest cycles needed to cause the model to fail, and a correlation between the rate of fatigue crack propagation and the length of the crack, according to the results. Additionally, the analytical findings demonstrated that this model, as opposed to models with fixed stress intensity factors, has a fatigue crack growth rate. The model that was carburized, quenched in coolant, then tempered and quenched again without performing the tempered appearance failed very rapidly. The high rate of the stress intensity factor with fatigue crack propagation is shown by the data analysis. The results show a reduction in the growth amount tendency of fatigue crack in the linear region mode-III.

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Effects of Repeated Heat Treatments on the Wear Resistance of Pre-Carburized Steel

Journal International Journal of Heat and Technology

publisher International Information and Engineering Technology Association

DOI https://doi.org/10.18280/ijht.410429

Issue No. 4

Volume Vol. 41

The current study embarks on the exploration of the influence of varying heat treatments on the wear characteristics of medium carbon steel samples undergoing carburization. The investigation involved seven distinct cooling processes, utilizing a range of quenching media to cool the samples from elevated temperatures of 780℃ and 770℃. The carburized steel specimens were subjected to two tempering protocols at 230℃ and 250℃. A comparison was drawn against control samples that were neither heat-treated nor carbureted. The empirical findings suggest a significant reduction in key wear indices such as weight loss, cumulative volume lost, wear coefficients, and wear rates upon the repetition of heat treatment. The third heat treatment regimen demonstrated the poorest results in terms of the aforementioned wear indices, superseding the negative outcomes of the second heat treatment, which in turn exceeded the first. Distinctly, samples quenched with distilled water exhibited the most desirable characteristics, recording the minimal values for weight loss, cumulative volume lost, wear coefficients, and wear rates, when juxtaposed with other quenching media. Conversely, the highest values for these wear indices were observed in samples quenched with shampoo and, to some extent, motor oil.

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FATIGUE BEHAVIOUR OF TEMPERED AND ISOTHERMAL HEAT TREATED AISI 5160 LEAF SPRING STEEL

Journal JurnalTeknologi

publisher UTM

DOI https://doi.org/10.11113/jurnalteknologi.v85.18640

Issue No. 3

Volume Vol. 85

The oil quench and temper technique have a lot of benefits for heavy duty spring manufacture since it may expose the best balance of toughness and ductility, as well as increase fatigue life. The current study looked at the fatigue behavior of tempered AISI 5160 leaf spring steel samples at tempering temperatures of 400, 450, 500, 550, and 600 °C, as well as isothermally heat- treated steel samples at 830 °C. All leaf spring steel samples that had undergone thermal tempering and isothermal heat treatment were then tested up to fracture utilizing rotational fatigue test equipment under the effect of various stress levels. All steel samples subjected to tempering heat treatments of 400°C to 600°C showed a decrease in hardness ratings. The Rockwell hardness ratings of the steel samples that treated to isothermal heat treatment increased significantly. Experimental fatigue testing revealed that the values of fatigue resistance for steel samples tempered at (400 and 450) °C temperatures dropped by a small amount. The fatigue resistance values for steel specimens tempered at 500 °C to 600 °C temperatures decreased more than the values for steel samples tempered at 500 to 600 °C temperatures. A fatigue resistance of steel samples that were treated to isothermal heat treatments, on the other hand, increased. Steel samples that were isothermally heat-treated at 830 °C and then chilled in a salt brine solution, on the other hand, showed an increase in fatigue resistance

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A Mathematical Model for Non-Linear Structural Analysis Reinforced Beams of Composite Materials

Journal Mathematical Modelling of Engineering Problems

publisher International Information and Engineering Technology Association

DOI DOI: https://doi.org/10.18280/mmep.100137

Issue No. 1

Volume Vol. 10

Abstract: The beams are frequently utilized in construction as well as in the fabrication of vehicles like as trains, ships, and airplanes. Depending on the necessary working circumstances, several materials may have been utilized in the production of these beams, from high fatigue resistance, high corrosion resistance, strong earthquake resistance, and other aspects. As a result, composite beams made of glass or carbon fibers are increasingly commonly employed. This is a result of its strong collapse resistance, light weight, and strong fatigue stress resistance. In order to compare the models' resistance to deformations, stresses, and strains that they are exposed to during loading, this article focuses on constructing a variety of models using a variety of composite materials and shapes. The outcomes demonstrate a rise in the rate of deformation. against beams with linear shapes in those with non-linear shapes. Additionally, the findings demonstrate an increase in stresses and strains in regions with curves (i.e., areas that are nonlinear).

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The Effect of Carburization and Repeated Heat Treatment with Different Solutions on the Fatigue Resistance of Medium Carbon Steel

Journal International Journal of Heat and Technology

publisher International Information and Engineering Technology Association

DOI DOI: 10.18280/ijht.400616

Issue No. 6

Volume Vol. 40

Many mechanical parts are exposed to failure as a result of mechanical stresses for design or metallurgical reasons, and the phenomenon of fatigue represents the largest area and reaches (90%) of the faults of engineering parts that are subject to periodic stresses. The risk of fatigue failure occurs without warning, so the phenomenon of fatigue resistance has taken up a large part of the research and studies concerned with the dissolution of metals. This article aims to study the effect of fatigue resistance of ASTM 1050 steel. Carbonation, repeated quenching at different temperatures (780 & 770℃) using seven different solutions, and tempering at repeated tempering after each quenching at temperatures (230 & 250℃). The stress resistance of all the studied samples decreases after the second cooling in distilled water, with the exception of the samples that were initially quenched with the same solution and then quenched again. This is one of the most significant findings. Another finding is that following a second chilling in distilled water-based solution, the resistance to fatigue stress rises, increasing by up to (8.5%) in comparison to samples that were first quenched in the same solution then diluted.

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Comparison of the Influence of Temperature Change Distribution of Three Surface Regions on the Hardness of Two Dissimilar Aluminum Alloys Welded by Friction Stir Welding

Journal International Journal of Heat and Technology

publisher International Information and Engineering Technology Association

DOI DOI: https://doi.org/10.18280/ijht.400419

Issue No. 4

Volume Vol. 40

Aluminum is one of the most commonly used alloys in industrial applications due to its significant qualities such as resistance to wear, high hardness resistance, and high conductivity. This study will concentrate on the hardness resistance of two dissimilar aluminum alloys at different rotational and travel velocities, where the behavior of the alloys' hardness resistance will be studied after the welding process, from the welding center to the alloys' edges, and this will be done in three areas. Due to temperature changes at the weld in these three separate regions, the first area was at the start of the welding process, the second in the midst of the model, and the third area was at the conclusion of the welding process, to examine the influence of temperature on the hardness resistance. The results showed that increasing the travel velocity of the feed cart and keeping the rotational velocity constant increased the hardness resistance, whereas increasing the rotary tool velocity and keeping the travel velocity of the feeding cart constant decreased the hardness resistance of the two welded alloys. The maximum hardness resistance recorded in the model's welding center (3-3) and its value were more than (49.47 percent) the lowest hardness resistance recorded for all models, which was for the model (7-1).

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The Effect of Multi-Walled Carbon Nanotubes Additives on the Tribological Properties of Austempered AISI 4340 Steel

Journal Journal Européen des Systèmes Automatisés

publisher International Information and Engineering Technology Association

DOI https://doi.org/10.18280/jesa.550311

Issue No. 3,

Volume Vol. 55

Due to a combination of optimal properties such as great strength, high hardness, good process ability, and good mechanical properties, AISI 4340 steel is widely used in many critical industrial applications such as nuclear, military, defense, and aerospace. It is also widely used in hydraulic forged machine tools, forged automotive crankshaft systems, shafts and gears, because of their improved characteristics, and its good tribological properties. The purpose regarding this work is to check the tribological characteristics of austempered AISI 4340 steel while dry and lubricated with machinery oil of SAE 30 grade as base oil. As received, AISI 4340 steel samples have been austempered to four definitely austenitic phase temperatures (850℃, 900℃, 1000℃, and 1050℃) for 90 minutes before being immersed in a mixture of potassium nitrite and sodium nitrite at 400℃ for 45 minutes. Friction and wear tests were then performed on austempered samples. Multi-walled carbon nanotube particles were blended at weight concentrations of 0.055, 0.1, 0.15, 0.20, 0.25, 0.30, 0.35, 0.40, and 0.45 with typical machinery oil of 30 grade as base lubricant oil. A pin on the disc wear configuration was used in the experimental investigation. The use of Multi-Walled Carbon Nanotube (MWCNTs) additives in the base oil resulted in a decrease in both friction coefficients and wear rates values when compared to typical base oil lubricant. The results also showed a reduction in both friction coefficients and wear rates as the sample's austempering temperatures were raised. Sliding surfaces were also photo micro graphed, and when the volume concentrations of Multi-Walled Carbon Nanotube particles in the normal base oil lubricant were increased, smoother surfaces with less damage were shown.

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The Difference in the Wall Thickness of the Helicopter Structure Are Made of Composite Materials with Another Made of Steel

Journal Mathematical Modelling of Engineering Problems

publisher International Information and Engineering Technology Association

DOI https://doi.org/10.18280/mmep.090204

Issue No. 2

Volume Vol. 9

Weight is of great importance in the aircraft industry. Aircraft are made of aluminum alloys that are susceptible to heat treatment, because they are light in weight and are metal strong enough for the dynamic designed loads they can face, but there are other reasons for obtaining alternative materials, and these materials are composite materials that it is lighter in weight than aircraft made of aluminum, firstly, and secondly, it can be formed into attractive shapes, eliminating welding and rivets, and thirdly, it can be formed into aerodynamic shapes. This work is based on designing a three-dimensional model consisting of aluminum alloy (AA-6061-T6) of the structure helicopter and then comparing it with five other models of different metal and composite materials to obtain a structure that has the least weight among these models. The results indicate that the best model with the lowest weight is the fourth model consisting of carbon fiber, proportions and weight of a square meter and a thickness of (28 mm) than the weight of the first model consisting of aluminum and weighing (81 kg), it was less than (22.7%). Then the fifth model, which consisted of an outer layer of aluminum with a thickness of five millimeters and another inner layer of aluminum of the same thickness, and between the inner and outer layer eighteen layers of carbon fiber, where the percentage of decrease in it compared to the first model by up to (19.2%), and worse a model in terms of weight is the second model was made of steel, which has a weight that is almost twice the weight of the first model.

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The Amount of Excess Weight from the Design of an Armored Vehicle Body by Using Composite Materials Instead of Steel

Journal Revue des Composites et des Matériaux Avancés-Journal of Composite and Advanced Materials

publisher International Information and Engineering Technology Association

DOI DOI: https://doi.org/10.18280/rcma.320101

Issue No. 1

Volume Vol. 32

In this paper, the amount of excess weight resulting from the design of a mathematical model composed of composite materials will be calculated and compared with a mathematical model of an armored steel structure. Five different models were designed, one of which is made of steel, the other part is made of composite materials, and a section of steel and composite materials, and then tested for resistance to stresses and compared the weight of each structure with that of the steel component by taking the maximum stress as a basic criterion for weight comparison. The results showed that the best model was the second model fiberglass, where the percentage of weight loss was compared to the steel model (73.77%), in addition to the wall thickness (62 mm) and the wall thickness of the steel model with which the comparison was (60 mm), but the displacement is (7. 24 mm), and in the steel model it is (1.827 mm). The best model compared to steel in terms of resistance to maximum stress, less displacement and less weight was the model consisting of steel with carbon fiber and its thickness was (47 layers& 57 mm, 2 layer & 10 mm steel and 45 layer & 45 mm carbon fiber), and the percentage of weight loss compared to the first mathematical model (60.96%). The results of this research may be a key to obtaining alternative materials for traditional materials in the manufacture of armored hulls, aircraft and ships, and it has a lower weight.

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Corrosion Behavior of Thermal Seamless Carbon Steel Boiler Pipes

Journal Annales de Chimie - Science des Matériaux

publisher International Information and Engineering Technology Association

DOI https://doi.org/10.18280/acsm.450506

Issue No. 5

Volume Vol. 45

The current study was absorbed on corrosion of ASTM A106 grade B -02 seamless carbon steel boiler pipes. Beyond corrosion experiments in corrosive medium with varying pH values, the weight lost in addition to corrosion rate (m.p.y) values were computed. The weight loss of boiler tube specimens exposed to corrosive liquid was shown to rise as the exposure period of the specimens increased. The results of the microstructure imaging showed that a de-carburized film of 240 μm thickness was shaped on the fireside of the pipe boiler, with ferrite and a few phases of pearlite. On the water lateral side, it was revealed that boiler pipe failure begins with small rust particles that expand to greater sizes and form scales that are displaced from the boiler pipe's surface. On the surfaces of the boiler pipe water side, several pits with crevice corrosion were observed. The corrosion amounts were discovered to decrease when the specimens' exposure time to corrosive environments and hydrogen ion concentration contents increased (pH). The findings of mechanical characteristic values such as hardness, yield strength, and tensile strength revealed that the waterside had higher values than the fireside, while the middle of the pipe had reasonable values. The findings also demonstrated that at low pH values, a tiny size of rust was created on the boiler tube specimen surface. However, at high pH values of

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Effect of heat-treatment temperature on the corrosion behaviour of cold worked 6111 aluminium alloy

Journal International Journal of Precision Engineering and Manufacturing

publisher The Korean Society for Precision Engineering

DOI http://doi.org/10.7736/JKSPE.020.114

Issue No. 6

Volume Vol. 38

The present investigation studies the effects of heat treatment temperature on the corrosion behavior of cold worked 6111aluminum alloy. The specimens were cold worked at different cold working ratios, namely, 10, 20, and 40%. They werethen heat treated at 100, 200, and 400°C. Corrosion tests were performed using tap water with 0.01 M sodium hydroxide,as a corrosive medium, and the weight loss of the corroded specimens plus the corrosion rates were then calculated.Experimental results showed that corrosion rates depended on the amount of cold working percentage and the heattreatment temperature. Corroded surfaces were also photographed and analyzed. The graphs revealed large numbers ofcorrosion pits, in addition to crevice corrosion and fine grains of rust, and these rusts were cultivated to scales that weredetached from the surfaces and were subjected to corrosive medium

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Comparison of the Resistance of Soild Shell of Composite Materials with other Soild Metal Materials

Publisher IMDC-SDSP

DOI DOI 10.4108/eai.28-6-2020.2298518

Country Turkey

Location Antalya