Journal of Engineering and Sustainable Development (JEASD)

1

INVESTIGATION OF FATIGUE LIFE OF 6061-T6 ALUMINUM ALLOYS WELDED BY METAL INERT GAS WELDING

Nawres Jabar Nasser

Pages: 1-15 English

Abstract

The present research aims to investigate the effects of Metal Inert Gas (MIG) welding process on the mechanical properties and fatigue life of AA 6061 T6. A series of experimental techniques has been conducted to evaluate the mechanical and fatigue life. metal inert gas (MIG) have been carried out on Rolled sheet of 12mm thickness to obtain many butt welding joints with dimensions of (200 *100* 12) mm and with geometry of single and double V at (70⁰) and square using ER- 5356 as a filler metal and argon as shielding gas. The welded pieces were tested by X-ray radiography and Faulty pieces were excluded Welding joints were subjected to heat treatment including heating the joints in furnace to (150 °C) for one hour then air cooling to relief heating stress.All specimens subjected to Vickers hardness, tensile test and microstructure examination.

Keywords

aluminum alloys fatigue strength Mechanical Properties MIG welding

2

DESIGN AND IMPLEMENTATION WEBSITE FAMILY DOCTOR HOME ADVISOR

Hind Khalid Hameed

Pages: 16-24 English

Full Text Issues

Abstract

Today, websites are efficient tool of communication within society. For example, when people need information about a company or an organization, most of them will almost instantaneously think of its website. In this paper the website is based on creating a database and storing a list of diseases and its diagnosis and medications, to allow the users have these information. And also let the user to ask the doctor about medical information and get the answer about them. The administrator of the website will be a Doctor; He will control the website by adding Diseases, Diagnosis and Medication to the database and answer the question of the users.

3

PROPOSED EXPRESSIONS FOR TORSIONAL CAPACITY OF RPC BEAMS

Hisham M. Al-Hassani, Jamal S. Al-Abasi, Wissam K. Al-Saraj,

Pages: 25-33 English

Full Text Issues

Abstract

In this study, two theoretical models were used to propose expressions for the ultimate torsional capacity of Reactive Powder Concrete (RPC) beams, by using regression analysis on test results through the use of the trail version 9 of data Fit software of Oakdale Engineering computer programs. The first model depends on the well known codes provisions for torsional capacity with adding the effect of steel fibers to the proposed expressions. The second model is regression analysis of the results of experimental torsion tests conducted on RPC beams in this investigation and previous study . Both the cracking and ultimate torsional strengths are established by this method.The proposed expression of Tcr and Tn showed good agreement with the experimental results provided by reverences.

Keywords

Regression Analysis RPC Tcr and Tn torsion

4

EFFECT OF CALCIUM CHLORIDE ON HIGHWAY SUBGRADE SOIL CONTAINING HIGH SOLUBLE SALTS

Saad Farhan Ibrahim, Abdulhaq Hadi A. Ali, Mohammed Salah Ibrahim

Pages: 34-49 English

Full Text Issues

Abstract

The quality of the subgrade will greatly influence the pavement design and the service life of the pavement. This study is performed to evaluate the effect of Calcium Chloride (CaCl2) on the strength of subgrade soil containing high percentage of soluble salts. The soil sample brought from Al-mahmodia city south of Baghdad, it contains about (15.685%) of soluble salts by weight of soil content. California Bearing Ratio (CBR) value is determined for the natural soil and Calcium Chloride (CaCl2) with different number of blow per layer (10, 25 and 56) for (4-days) soaking periods to achive CBR value at 95% relative modified proctor. Durability tests (effect of long term soaking and drying) for the subgade stabilized with (2.5% CaCl2) and compacted at 95% relative modified proctor is determined, the soaking periods are (4, 7, 14, 28, 60 days), the results of soaking periods are ( 7.961, 6.446, 4.436, 3.398, 2.427) respectively and the results of soaking and drying periods are ( 8.258, 6.531, 4.563, 3.511, 2.621). The results of soaking and drying show reduction in both (CBR) value and (T.S.S) with the time.

Keywords

14 2.427) respectively and the results of soakin 2.621). The results of soaking and drying sho 25 and 56) for (4-days) soaking periods to ac 28 3.398 3.511 4.436 4.563 6.446 6.531 60 days) 7 it contains about (15.685%) of soluble salts The quality of the subgrade will greatly infl the results of soaking periods are ( 7.961 the soaking periods are (4

5

AN EFFICIENT IMAGE COMPRESSION ALGORITHM FOR BAYER-PATTERN IMAGES

Saad Mohammed Saleh, Khalid Awaad Humood, Adham Hadi Saleh

Pages: 50-61

Full Text Issues

Abstract

In this paper, an efficient image compression algorithm for Bayer-pattern images is introduced. In Bayer pattern images each pixel is represented by 8-bit rather than 24-bit for colour images. The proposed algorithm separates the colour information from the Bayer-pattern image data before performing the compression operation. It partitions each colour plane into fixed size blocks. Each block is classified as a low or high intensity variation block using the standard deviation which compared against a predefined threshold. The low intensity variation blocks are encoded by its average while, the other blocks are encoded using the minimum, quantisation step and the bit plane. The quantisers that used in this paper are from 32 and 16 levels types. The effect of the block size on the output bit rate and image accuracy is studied. The results clarify that a good performance is achieved using 4×4-pixel blocks. Using 32 and 16 quantisation levels a bit rates of 1.8 to 5.2 bpp with a PSNR of 30 to 45 dB can be achieved for a range of thresholds 10 to 0.5.

Keywords

Bayer pattern Encoding Image compression Quantising

6

TORSIONAL BEHAVIOR OF STEEL FIBERS REINFORCED SELF-COMPACTING CONCRETE BEAMS

Jasim Al-Khafaji, Ihsan Al-Shaarbaf, Ra\'id F.Abbas

Pages: 62-80 English

Full Text Issues

Abstract

This research investigates experimentally torsional behavior of steel fibers reinforced self-compacting concrete beams with variables including steel fibers volume fraction(0.4% and 0.8%), reinforced with steel bars or non-reinforced self-compacting concrete beams and spacing of transverse steel bars reinforcement.The experimental work includes investigation of nine beams tested under pure torsion and divided into three groups. Group (A) represents the non-fibrous normal strength SCC beams. Group (D) covers the fibrous normal strength SCC beams with steel fibers content (Vf) of 0.4%, and finally group (E) is fibrous normal strength SCC with steel fibers content (Vf) of 0.8%. Test results are discussed based on torque-twist behavior.

Keywords

self-compacting concrete Steel fibers torsion

7

THE MECHANICAL PROPERTIES OF POLYMER-MORTAR COMPOSITES

Besma M. Fahad, Khalid M. Eweed, Yaser M. Abdalateef

Pages: 81-95 English

Full Text Issues

Abstract

The polymer-mortar composites have several benefits, including corrosion resistance, high strength and modulus values compared to their low density, acceptable deformability, tailored design and excellent formability. This enables the fabrication of new elements and the structural rehabilitation of the existing parts made of traditional materials. In this work two sets of mixtures were prepared that consist of mortar and polymer to fabricate the polymer-mortar composite. The first set include mortar with ratio (1:1) (cement-sand) without water, while the other set include mortar with ratio (1:2) (cement-sand) without water. The polymer was epoxy which is added to the mortar after mixing the resin with the hardener in proportion of (1:3). Each set consists of different percentage of polymer (50:50, 40:60 and 30:70). to obtain Several results were obtained such as density, were the highest value was about 1906.4 kg/m3 for (1:1).

Keywords

Composite mortar Polymer polymer – mortar

8

EFFECT OF STEEL PLATES ON SHEAR STRENGTH OF WIDE REINFORCED CONCRETE BEAMS

Amer M. Ibrahim, Wissam D. Salman, Qusay W. Ahmed

Pages: 96-109

Full Text Issues

Abstract

In this study, shear behavior of reinforced concrete wide beams was investigated experimentally. The experimental program consisted of four wide beams of 45 MPa concrete compressive strength tested with a shear span-depth ratio (a/d) equal to 4.52. One of the tested wide beams had web reinforcement as a control specimen, and the other three specimens had no transverse reinforcement but contained vertical shear steel plates. The flexure mode of failure was secured for all of the specimens to allow for shear mode of failure. The key parameters covered in this investigation were the effect of the existence solid and hollow vertical steel plates on the shear capacity of the tested wide beams. The study shows that the contribution of vertical steel plates to the shear capacity was significant and directly proportional to the existence and direction of the steel plates. The increase in the shear capacity ranged from 9.52% to 47.62% for the range of the tested beams compared with the control beam. Transverse vertical steel plates with voids were more effective in the contribution of the shear strength of wide beams and enhances the ductility of the wide beams.

Keywords

Shear Reinforcement steel plates Stirrups wide reinforced concrete beam

9

STRESS RELAXATION ON PROSTHETIC LAMINATED SOCKET MATERIALS

Kadhim Kamil Resan, Yasir Khalil Ibrahim, Shireen Hasan Chaloob

Pages: 110-124

Full Text Issues

Abstract

The mechanical properties of socket materials are decreasing with time because they have a time dependent nature. This research evaluated mechanical properties of the composite materials that used to fabricate prosthetic sockets. Stress relaxation, the time-dependent property, was evaluated from creep test by testing two types of socket materials at 50 oC and by using Burger viscoelastic model; the equation of stress relaxation modulus was obtained and it found that the stress relaxation modulus decreasing with time. In addition a pressure between the residual limb and the prosthetic below knee socket measured by using F-socket system. Besides this study include a numerical approach to find the deformation distribution on socket that resulting from decreasing in stress relaxation modulus by using ANSYS workbench 15, it found the socket materials were deformed with time, the deformation of material A was increased from (2.03 to 24.4 mm) during 150 minute, while material B increased from (5.2 to 31.2 mm). The difference in resistance to deformation in the socket materials due to the types and numbers of reinforcement used in these materials.

10

COMPARING THE PERFORMANCE OF PHASE SHIFT MODULATION TYPES AND THEIR EFFICIENCY IN A DIGITAL COMMUNIC

Yasameen Abdul Ghani

Pages: 125-140 English

Full Text Issues

Abstract

The power spectral density (PSD) of a modulated signal is a direct indication of the bandwidth efficiency of the modulation scheme. A modulated signal with wider PSD consumes more transmission bandwidth compared to a signal that has narrower PSD. This research will provide expression for high power spectral density without increasing in the transmission bandwidth by using of M-ary PSK signals, which can be specialized for M _ 2 (BPSK) , M _ 4(QPSK) ,M-8(OPSK) and M-16. To simplify things, it use the fact that for pass band signals with certain properties. the performance of M-ary PSK modulation will be introduced with a generated noise , in additive white Gaussian noise channel(AWGN) :and compare between the performance of the types above .

11

APPLYING BOUNDARY ELEMENT METHOD TO SOLVE THE HEAT CONDUCTION PROBLEMS USING CONSTANT ELEMENT

Saad Najeeb Shehab

Pages: 141-157 English

Full Text Issues

Abstract

In this work two-dimensional boundary element method (BEM) using constant element is mathematically and numerically investigated and applied to solve differential equations of the heat conduction problems and temperature distribution of solid bodies to be found . A computer program in Fortran 90 language is constructed to solve heat conduction problems in steady-state regime by using boundary element technique with constant element . The effects of elements number ( ne ) and internal points number ( np ) of the boundary model on the temperature distribution have been investigated . A more accuracy of results and more near with exact solution are obtained by increasing number of boundary elements and internal points of the boundary model .

Keywords

BEM Boundary Element Method Constant Element Heat Conduction Steady-State

12

STUDY TO IMPROVE HEAT TRANSFER REDUCTION FOR EXIST BUILDING’S ROOF BY USING LOCAL AVAILABLE MATERIAL

Ibtisam Ahmed Hasan Salih

English

Full Text Issues

Abstract

The research is developed to study the impact of structural change makeup for the cover of an exist building’s roof in the city of Baghdad on thermal loads . It included the study of several variables to change the quality of thermal insulation materials for ceilings and the quality of thermal insulation material added, the quality of seven kinds for local material for external packaging ,they are reed, reed without air gap, nylon mat, felt, Jnvas, Jnvas stuffed with sawdust, and hyper HTS and the quality of material used for secondary roof which are plate of gypsum and a hollow plastic plates of (8.5 mm) thickness and (4.7 mm).

Keywords

buildings cooling load exist roof local material

13

USING A NEW DIGITAL TECHNIQUES TO BUILT, UPDATE AND ANALYSIS OF DATABASE OF A THEMATIC PAPER MAP CAS

Oday Zakariya Jasim

Full Text Issues

Abstract

The new digital technology in the field of maps and satellite images are one of the Important means in Build and update database of a thematic paper map, which is for the study of a particular subject in a specific time and that because of its these technologies from the full capability to deal with paper maps and turn it into a digital form which can be read co-ordinates digitally. From this point has become a set of these modern digital technologies necessary weapon used by the planner to control of data variables in a specific time and place specified. The inefficiency of paper maps through their inability to identify the logical relationships between the elements of the spatial maps does not appear effect on any element last linked with a logical, as well as the difference in scaling of these maps are disabled in the work of analysis and comparison mathematically and finally, the time that started to build the spatial and the attribute data is considered obstacle to update the map. Accordingly the updating of the data of the thematic map are the process is very expensive and time-consuming and therefore the lack of planning and engineering trend to overcome those obstacles are the problem of the research, . This approach can be summed up the adoption of satellite imagery techniques with high resolution of one meter and digital image processing software and GIS programs as well as the technique of the Global Positioning System.

Journal of Engineering and Sustainable Development (JEASD)

Articles in This Issue

Abstract

Keywords

Abstract

Abstract

Keywords

Abstract

Keywords

Abstract

Keywords

Abstract

Keywords

Abstract

Keywords

Abstract

Keywords

Abstract

Abstract

Abstract

Keywords

Abstract

Keywords

Abstract