Table of content

DIYALA JOURNAL OF ENGINEERING SCIENCES

مجلة ديالى للعلوم الهندسية

ISSN: 19998716/26166909
Publisher: Diyala University
Faculty: Engineering
Language: English

This journal is Open Access

About

A Scientific and Evaluated Journal Published by the College of Engineering – University of Diyala
Date of First Issue (2008)
No. of Issues per Year (2) (mid-year journal)until 2013 they became (4)per year (seasonal journal)
No.of Issues Published between (2008–2013) 13
Journal publishes research in Arabic and English specialized in all fields of engineering.

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Contact info

journal.eng@engineering.uodiyala.edu.iq

Table of content: 2019 volume:12 issue:2

Article
Simulation two storey house of masonry wall under the earthquake load

Authors: Ali Laftah Abbas --- Maan. H. Saeed
Pages: 1-12
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Abstract

The masonry wall building systems have high sensitivity against earthquakes and the fact that this system of construction is widespread in Iraq, especially condominiums. Iraq subjected to many earthquakes in recent years and is expected to be subjected to more intensities of earthquakes in the future engendered an urgent need to investigate the behavior of this type of construction under the influence of earthquakes. The analysis of two-storey house in this research paper was performed by the finite element package program ABAQUS. Model simulation with dimensions (5 * 20 m) from the common one and two-storey house models in Iraq. The compressive strength of bricks (17MPa) type A and compressive strength of mortar(15MPa) with mixing ratio 1:3 was used to represented of the properties of construction materials in Iraq. The nonlinearity behavior of the materials is considered in this research paper. The model is subjected to PGA(0.5g) from EL-Centro Earthquake (1940 N-S ) as input ground motion to determine its seismic performance compared the maximum displacement, drift and base shear for models with the seismic demand of Iraq. Through the analysis of the results, the models proved efficient and stable against the effect of earthquakes, especially when the load applied in the Z long direction, more than the load applied in the X short direction for all models.


Article
Estimation of Wear Depth as an Approach to Predict Tool Service Life in Cold Forming Process

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Abstract

Wear phenomenon is considered as a predominant parameter in the forming processes causing the shorten tool life which in turn increases the production costs. In this study, wear depth of tool components for multi-stages of metal shell of spark plug (MSSP) manufacturing was analyzed using Archard's model with FE simulation software. The 3D geometry models were built using SolidWorks software then the models files were exported to Simufact forming software to do the settings of preprocess and FE analysis. The cylinder compression test and ring compression test were executed to get the flow stress and frictional factor respectively. Product parts dimensions, forging loads, effective stress, relative sliding velocity and contact pressure were solved and discussed. Subsequently to verify the analysis acceptance, the actual product parts measurements which obtained by coordinate measuring machine (CMM), were compared with the simulation results. It was found that the deviations of actual MSSP geometry dimensions less than (4%). Also verification is performed to forging loads at each stage which gives a good agreement between actual and FE simulation results. Finally, the wear depth of tool components were calculated for each stage using the FE software. Based on the results of wear depth from simulation and tolerance rages of actual product parts, tool service lives were predicted to find the productivities for each tool component. The results of FE simulation were compared with the CMM measurements for known productivities tool components from actual production line, which gives a good accuracy and acceptable agreement.

Keywords

Wear --- Cold Forming


Article
Mechanical properties (Tensile, Hardness and Shock resistance) for the phenol formaldehyde resin with Epoxy resin

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Abstract

Phenolic formaldehyde (resole) resin was used at a different weight (10%, 20%, 30%, 40%), with epoxy resins at varying percentages (90%, 80%, 70%, 60%) at 20 C °. In order to study the mechanical properties (which including: Tensile strength, hardness and shock resistance), for the purpose of analysis and comparison with the mechanical properties of alloys, and the selected part for the purpose of replacing the alloy with the composite materials to reduce weight and improve mechanical properties. The results indicate improved properties with increased epoxy resins due to increased bonding between components.

Keywords

Epoxy --- phenol formaldehyde


Article
Effect of Heat Treatments on the Mechanical Properties of Welded Joints of Alloy Steel by Arc Welding

Authors: Hamid M. Mahan
Pages: 44-53
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Abstract

This research deals with influence of the heat treatment on welded joints using the shielded metal arc welding (SMAW) on three types of steel with different carbon ratios under constant conditions such as the thickness of metal 20 mm, welding current 120A , voltage 80V, Diameter 15 mm and angle 60 degree. Mechanical tests were carried out to include tensile, bending, micro hardness and microstructure testing. The results showed that the steel with a low carbon content has the highest value of hardness after performing heat treatment in the area of welding line 370 HV. Unlike the moderate carbon- steel, the value of hardness was higher in the 310HV, the tensile strength of steel decreased to 554Mpa when carrying out the heat treatment compared with steel containing higher carbon ratios 523MPa . In the other side improving toughness and impact strength for welded joints on which heat treatments have been conducted after the welding process , where highest impact value was obtained in the high carbon steel 214 J.

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Article
Effect of Shot Peening on Mechanical Properties for Steel AISI 1008

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Abstract

Residual stress has a significant effect for improving engineering properties for metals .Most of the surface treatments produce compressive residual stress at the metal surfaces, which reduce crack initiation and increasing the metal resistance to fatigue, which is shot peening process. Shot peening is usually used for this purpose for producing plastic deformations of surface of the metal which can lead to creation high residual compressive stresses at metal surface .This research include study the influence of shot peening process on fatigue resistance, surface hardness and surface roughness for low carbon steel (AISI 1008). This process accomplished with different times which were (10, 20 and 30(minutes. The result of the fatigue test showed that the fatigue limit increase when shot peening time increased and the best fatigue limit obtained when shot peening process was carried out at 30 minutes. Results of hardness test showed that surface hardness increased with increase of shot peening time. It can be seen that highest value of surface hardness is obtained from shot peening process at time (30 minutes) which is (235.1 HVN). Results of surface roughness test showed that the surface roughness of metal increased when time of shot peening increased


Article
Design and Implementation a Student’s Transcript System

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Abstract

The importance of information at present has increased the importance of database systems to organize the information we need, and to provide it for use in the appropriate and timely manner. Thus, the science of managing database systems evolved from a subtopic in computer applications to a basic subject and a major component of modern computer science, thus, database systems have become a key part of the Platform for Computer Science. This paper presents the design and Implementation of a Transcript System for college of engineering, University of Diyala, this system releases transcript by retrieving student’s data from database which later stored in Microsoft access database with user interfaces designed by using the tools of Microsoft Visual Studio 2010 (.Net). This system solves most of the problems which happen by using manual methods such as delay in the delivery student’s transcript, mistakes in the student data in the transcript (name, average...). The system provides sufficient capacity to facilitate the work of the registration staff with respect to data entry and validation and increases efficient service delivery and benefits both registration staff and students.

Keywords

Transcript System --- design


Article
Effect of Road Profile on Suspension System of Heavy Truck

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Abstract

All vehicles are affected by the type of the road they are moving on it. Therefore the stability depends mainly on the amount of vibrations and steering system, which in turn depend on two main factors: the first is on the road type, which specifies the amount of vibrations arising from the movement of the wheels above it, and the second on is the type of the used suspension system, and how the parts connect with each other. As well as the damping factors, the tires type, and the used sprungs. In the current study, we will examine the effect of the road roughness on the performance coefficients (speed, displacement, and acceleration) of the joint points by using a BOGE device.


Article
Effect of Al2O3 and Fly Ash Addition on Mechanical, Wear and Corrosion Properties of Al-Mg-Si Base Alloy

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Abstract

The aim of this study is to studding the effect of addition of alumina and fly ash with the particles size 106μm and different weight rations (2:2, 2:4, 4:2) to aluminium- magnesium-silicon alloy on microstructure, mechanical properties, corrosion resistance, and wear. The vortex technique was used to prepare the composite material. The microscopic structure was also examined using optical microscopy and mechanical tests (hardness, tensile strength, yield strength and elongation) and wear test. The results showed that the composite material the containing (2% fly ash and 4% alumina) had the highest tensile strength (119 Mpa), yield strength (76 Mpa) and hardness (89 kg mm2), while it has the lowest ductility (5.3%). It was also found to have the lowest wear rate (1.8* 10-6gm cm) and the highest corrosion resistance.

Keywords

fly ash --- wear --- corrosion


Article
Optimal Kinetic Parameters of Trickle bed Reactor for Oxidation of 2-Proplymercaptan in Naphtha

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Abstract

The best kinetic of the reaction are estimated based on experimental data obtained from the literature using parameter estimation technique. The best mathematical model for oxidative 2-proplymercaption via oxygen is taking into account the apparent intrinsic kinetics considering internal diffusion and TBR hydrodynamic effect on the reaction process mainly , catalyst wetting efficiency, catalyst effectiveness factor, Thiele model and the effective diffusivity. The optimal operating condition for oxidative process is carried out utilizing. The optimization technique based upon the minimization of the sum squared error between experimental and predicted composition of naphtha oxidative process to determine the best parameters of kinetics models. The predicted product compositions for oxidation process found to be a good agreement with the experimental data for wide range of operating conditions (2.5-10 hr-1, 75-300 ppm and 293- 353K) with minimum error 5% among all results


Article
Suitability of Ground Water in Southwest Kirkuk for Human Consumptions

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Abstract

Groundwater is one of the important sources of providing the human with water for drinking and other purposes. In Iraq, most of the agricultural land far from surface water sources, which forced these farmers to use groundwater wells as a source to cover the needs of the water and uses for different household. Furthermore, in some areas of Iraq, the available surface water that is suitable for human consumption is insufficient. Hence, the ground water is the viable solution to provide drinking water.The aim of this study is to show the extent validity of the ground water for various human uses.Twenty wells were chosen at different location in the southwest of Kirkuk city. Physical and chemical tests were carried for each water samples which include nitrite- nitrogen, phosphate, total hardness as CaCo3, total dissolved solids, chloride, PH, and turbidity. The results were evaluated and compared accordingly with World Health Organization (WHO) specifications. The results showed that the ground water in the study areas not suitable for drinking because of the contamination with Nitrite – nitrogen, phosphate and high contents of total hardness and TDS.


Article
Lateral Performance for Long Pile Subjected to Simultaneous Axial and Lateral Loads in Dense Sand: An Experimental Study

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Abstract

The present study focus on the investigation ofthe response of single pile when subjected to both axial and lateral loads simultaneously in dense sand. To study this issue, laboratory model was locally improved to examine the piles under this kind of loading. The dense sand provided using raining technique. The slenderness ratio of the tested pile is ( L/D=45). On the other hand, the vertical and horizontal loads are divided into 5 stages to assess the influence of load intensities on the lateral pile response. It can be concluded that the lateral pile response is affected by changing the load intensities


Article
Characteristics Composite Materials to be Used in Trans-Tibial Prosthetic Sockets

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Abstract

To initate a datebase on material properties on typical laminations used in belwo knee prosthetic socket (Trans- Tibial). The authors subjected samples of common prosthetic socket laminations to tensile, bending, and fatigue tests. Two varieties of lay up material (fibers) were each laminated separately with common resins (acrylic), resulting in four combinations of fiber/acrylic resin. Fibers made of carbon fiber and perlon fiber were used at different volume fractions. The result showed that socket prosthesis made of carbon fiber and perlon fiber (12 layers) has highest tensile and flexural strenght when compared to other laminations. Material test results indicate that the composite material (12 Layers) have better tensile and fatigue properties than composite material (8 layers). The ultimate tensile strength, and the modulus of elasticity composite material (12 layers) are higher than those of the composite material (8 layers) by 0.124% and 0.072% respectively, and by 0.1% and 0.185 for composite material (8 layers ) with volume fraction of matrix equal 0.72). Vacuum technique is good process and this prevented cavites or defects in specimens.

Table of content: volume:12 issue:2