Table of content

Iraqi journal of mechanical and material engineering

المجلة العراقية للهندسة الميكانيكية وهندسة المواد

ISSN: 20761819
Publisher: Babylon University
Faculty: Engineering
Language: Arabic and English

This journal is Open Access

About

Iraqi journal for mechanical and material engineering is a refereed scientific journal published quarterly by the engineering college/ university of Babylon. It deals with high quality researches in fields of mechanical and material engineering.

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Contact info

Journal E-mail:
j.mec_mat_eng@yahoo.com
Babylon university/Babylon/Iraq P.O.Box(4)
Tel:++96430245387.(1155)

Table of content: 2009 volume:D issue:first conf./ eng. coll.

Article
VARIATION OF MONTHLY RAINFALL AND

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Abstract

In Babylon Governorate there exists a single meteorological observing station which is located at Hilla city. An observation at this station is a point observation. In order to determine variation of rainfall and of evaporation in Babylon Governorate records at nearby stations should be considered. These stations are Baghdad, Kerbala a, Najaf, Diwaniya, Kut, Hai, and Ramadi stations which are located outside the boundary of Babylon. In this study the Thiessen polygons method is used to define zone of influence for each of these stations and, hence, monthly mean rainfall are computed. It is found that the monthly mean rainfall are 15.159, 18.08, 22.719, and 15.339 mm/month for the winter months November, December, January, and February respectively. The monthly mean evaporation are found to be 266.912, 288.057, and 259.936 mm/month for the summer months Jun, July, and August respectively.


Article
A GIS-Assisted Optimal Urban Route Selection Based

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Route planning analysis in Geographical Information System (GIS) provides strong decision support for users in searching optimal route, finding the optimal path is an important advanced analysis function in GIS. This paper presents the problem of selecting route to connect two locations in Baghdad city; Alkadomiyah and Algria'at. Four alternatives were investigated using a multi criteria approach and spatial decision support system, (SDSS) that will assist a decision-maker, to select the optimal route fora new road path. In ARCGIS 9.2, spatial analysis has been used to carry out the search strategy. In general, the goal of this study is to develop a (GIS) - based model to determine suitable route. Therefore, the required data for the proposed model building were identified by using, land use, transportation maps, aerial photographs and ographic features then reviewed for model development requirements. Four factors were considered; Geotechnical, Geometrical, social and economical factors for multicriteria evaluation to select the best route alternative. ARC GIS 9.2 software was used for the analysis and model building requirements. In actualizing the aim, satellite ages of the study area was provided while the land-use map was obtained fromDesign Office-Amanat Baghdad. The land-use over the study area was classified into eight different classes. A Digital Elevated Model (DEM) over the study area was downloaded from the Global Mapper Software, used to derive the slope map over the area of study and the Analytic Hierarchy Process (AHP) was used in weighting the ions. Finally, the case study demonstrated that GIS based on multi-criteria approach is recognized to be used as a tool for the optimum route selection by considering the factors affecting on the decision-maker route selection. Furthermore, saving of money, time and effort.


Article
The Effect of Sulphate Salts on The Collapsibility of

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Abstract

The research aims to study the presence effect of sulphate salts of ( Calcium, Magnesium, and Sodium ) in the ground water on the collapsibility of Kerbala gypseous soil with high gypsum content (27%). These types of salts are one of the main sources for ground water to be more salty. The recompacted soil samples at field unit weight ( 13.51 kN/m ) were prepared for each collapse test. Four different concentrations for each type of sulphate were added in each collapse test in addition to distilled water to predict the collapse potential for the gypseous soil. The soil sample soaked with distilled water only was denominated as the reference soil sample. The results showed that the presence of magnesium sulphate salt ( higher concentration of sulphate common ion for its high solubility ) depressed the gypsum solubility in the soil and had been achieved minimum value of C.P% as compared with the other used solution. 3

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Article
Mechanical Properties of High Performance Concrete Re-tempered in

Authors: Prof. Dr. Shakir Ahmed Salih
Pages: 576-589
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Abstract

This paper studying some of the Mechanical properties of High Performance Concrete re-tempered by using G51 after 90 minute waiting at 3 different ambient temperature (23, 40, 57)starting from lab temperature to high temperature during casting which may simulate summer degree in Iraq. The comparative made with reference concrete in the same environment. HPC produced by adding High Reactivity Metakaolin after burning. Compressive strength, Ultrasonic Pulse Velocity, Splitting tensile and Flexural test was made for both reference and HPC mixes.

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Article
Retrofit of deteriorated structure due to rocket strikes

Authors: Dr. Riyadh A. Abbas (Ass. Prof.)
Pages: 590-598
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Abstract

A two stories building in Samawa City was struck by three rockets on March 2003.The building has been constructed from brick, unfortunately it experienced cracks in slabs and walls due to the strike of rockets. It is recommended to remedy and rehabilitate this construction for accommodation of Medicine College Deanship in Al.Muthanna University. In this paper remedy methods was presented considering the strengthening of the deteriorated members of the building and retrofit them. According to the analysis it was found that the proposed method for retrofit was a safe enough and economic one comparing with the new structure.


Article
Stability Analysis of Cellular Retaining Structure by PLAXIS

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In this study, analysis of retaining structure by using the software PLAXIS is adopted and the deformation that occurs in the body of the retaining structure after applied the failure load detected; the failure loads are obtained from the series of laboratory tests. Then, the cofferdam is modelled by using finite element code PLAXIS. The laboratory tests have been carried out two diaphragm cells of different width to depth ratios, and used three different soil materials (subbase, sand passing No.4, river sand, and clay). The analysis includes studying the effect of height, width, and embedment depth. The input data of soils that are used in this software are getting from these laboratory tests. The comparison is done between the deformation that is obtained from the actual experimental and the software PLAXIS. It can be seen that the displacement for the retaining structure place on ground surface in the laboratory test equal to 0.00322m and the displacement that obtain from PLAXIS equal to 0.00372m, and the displacement for retaining structure with embedment depth in laboratory test equal to 0.00321m and the displacement from software PLAXIS equal to 0.00263m Thus, the results from these two studies have been found closed to each other.

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Article
Suggestion new procedure to

Authors: Eng. Yahya K. altemimi
Pages: 613-622
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Abstract

This work studies contain the statement of wells construction in south and south-west of Iraq because the special geological information in this region ( hard rocks stratum and deep of ground water aquifer ) . therefore, we must have all ability and experiences to complete this work . under this situated I made wells construction program to complete this work .

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Article
EXPERIMENTAL INVESTIGATION FOR IMPROVING

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Abstract

The use of carbon fiber reinforced plastic (CFRP) strips to enhance the behavior of local stability for thin-walled tubular steel columns has been investigated experimentally. Tubular steel columns specimens are made from welding thin plates at their edges. The type of strengthen carbon fiber is a unidirectional woven fiber mat of mid strength which is a product of Sika coded as SikaWrap -230C. The CFRP is fixed using a resin Sikadure-330. The study is focusing on the local stability of such members. Many pattern of wrapping are suggested herein. Recommendations have been drawn for the best pattern chosen to obtain the most efficient and economic strengthen pattern.


Article

بناء نظام ادارة الجودة للمختبرات الانشائية في كلية الهندسة / جامعة بابل وق الايزو 17025 لسنة 2005

Authors: هاجر فائق خضير
Pages: 635-652
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Abstract

As for the required precession and confidence for tests performed by the construction laboratories and its significance to determine the quality level for buildings during the construction period and during its life span. Therefore, it is necessary for these laboratories to have Quality Management System. The objective of this research aim to highlight the importance of applying ISO 17025:2005 for competence of tests and calibration laboratories, regards of there number of personal and work load, or being part of a large organization offering services or product according to ISO 9000:2000, and suggest a quality system suitable for a construction lab. In order to obtain the Iraqi national quality certificate according to ISO 17025: 2005 for the first time in the country in this field. The Engineering college construction laboratories was selected as a case study to investigate its (QM) procedures and polices currently used. The result of these investigations show the pitfalls and weakness of the current system according to the international standards requirements so a proposal quality system was suggested with an implementation program for to compile with this standard.

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Article
بعض الخواص الميكانيكية للخرسانة البوليميرية المعززة بألياف الفضلات البلاستيكية

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Abstract

This research includes study the effect of adding plastic chips resulting from cutting the plastic beverage bottles (which is used in Iraqi markets now) as fiber added to the polymer concrete and study there effects on some properties of polymer modified concrete like compressive strength and flexural strength. Two different percentage of fiber by volume equal to (1.6% and 3.25%) were used to made mixes. A reference mix was also made. SBR polymer was added as percentage of cement weight equal to (10%) to all concrete mixes. Results proved that , improvement in mechanical properties with an increasing of fibers percentage by volume . An improvement in flexural strength (modulus of rupture ) appeared more clearly . The maximum increasing in the value of 28-day modulus of rupture equal to (24.4%) for PMC mix with fiber percentage (3.25%), whereas the ximum increasing in compressive strength was equal to (4.1%) for the same mix. No clear different in density are notes.

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Article
Theoretical Study and Simulation of Corrugated Silicon

Authors: Mohammed Midhat Hasan
Pages: 665-675
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Abstract

In this paper, silicon diaphragms with planar and corrugated shapes are studied through both theory and simulations. The analytical calculations of deflections are ared with FEM simulations with good agreement. The results show that linear load-deflection relationship can be obtained by increasing corrugation depth and corrugation pitch did not show any noticeable effect compared to other parameters. Therefore the rule of thumb in the design of a corrugated diaphragm is that increasing diaphragm diameter and/or decreasing diaphragm thickness increase diaphragm sensitivity and that increasing corrugation depth increases the linearity of load- deflection relation.

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Article
Visual detection welding defects in dust perception and correction

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The research solve problems of welding defects for dust perception in AL Janoob cement factory .Assembly of steel structures type carbon steel DIN St37by using manual metal arc welding process and electrode type low hydrogen ESAB 48.00 equivalent to American welding society AWS E7018. From visual inspection to assembly appeared many welding defects. In this research used liquid penetration methods helped to detection of fine defect and crack opening to surface that cannot be detection by visual inspection .where fined many types of welding such as(under cut ,spatter, porosity, nonmetallic inclusion, under fill, excessive reinforcement ,surface roughness, arc strikes) defects due to pin holes restricted in welding joint (appear by given cross section in many welding joint by visual inspection and liquid penetration also we don’t using other method of inspection because acceptable requirement only visual and liquid penetration) and others because used of high welding current and welding travels speed. These problems solved by removing welding defects and re-welded by using drier electrode (250°C for 4hr) and using the proper welding current and speed.

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Article
Study the Effect of Grain Refinement and Modification on

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The present study deals with an investigation of dry sliding wear behaviour of grain refined and or modified (Al–20Si) alloy by using a Pin-On-Disc. The refining was by grain refinements (Ti and B), modification (Sr, Na and P) and combined action of both (Ti, B + P +chilling). Results indicate that combined grain refined and modified Al-20Si alloys have microstructures consisting of uniformly distributed α-Al grains, eutectic Al–silicon and fine primary Si - particles in the interdendritic region. These alloys (5, 6) exhibited better wear resistance (13-15 times) than the same alloy subjected to only grain refinement or modification (1, 2 and 3) . The improved wear tances are related to the refinement of the aluminum grain size, uniform distribution of fine fibrous eutectic Al–silicon and fine primary Si- particles.

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Article
NUMERICAL SIMULATION OF ELECTROMEGNETIC

Authors: Dr. nizar jawad hadi
Pages: 698-710
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This work deals with the improvement of surface quality, microstructure of the aluminum alloy ingot by electromagnetic casting using finite element method with the help of Ansys program. Magnetic flux density and magnetic flux density gradient are used as indicators for uniform temperatures distribution and new liquid metal flow. Two models are simulated in this study; the first one represents a solid cylinder with a single coil where the effects of current intensity and frequency on the melt metal are studied. The second model is a hollow cylindrical with outer/inner coils. The effects of current intensity, due to the interaction between the outer and inner coil are studied. The results of the first model simulation indicate three stages with the current increasing. The first one near the center of the ingot enhanced approximately homogeneous behavior, while the increasing occurs gradually in the second and third stages. Also with decreasing of frequency the magnetic flux density at the center of ingot increasing. The second model results of hollow ingot show that the magnetic flux density increases linearly with outer coil current increasing from (85 – 380) A at the same inner coil current value, and the homogeneous behavior enhanced in 0.55 outer/inner coil current ratio also illustrates homogeneous behavior at different current values but with the same ratio.


Article
الدقة في انتاج خرائط الاساس الرقمية لمدينة الحلة

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Base Maps are the foundation of the city's holiest and most important of the documents because it is a record of public and private property as well as the importance lies in the process of modernization and development of urban planning of then city. As a result of the construction and investment and construction in Iraq, there was a need for the production of digital maps to keep pace with technical progress and the possibility of using the software of modern planning and management and the provision of effort and time and money. In this research was transferred to the paper maps the basis of digital maps using optical scanning equipment and then painted by AutoCAD and satellite imagery collected over the study area. Accuracy in the production of these maps rely heavily on paper maps drawn by hand "as well as the accuracy of satellite images used for the signing and the compilation of these maps as we have noted more accurate digital maps produced at the satellite images collected with high accuracy.

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