Iraqi Journal for Mechanical and Materials Engineering最新文献_第9页

STUDYING THE IMPROVEMENT OF TENSILE STRENGTH OF LOW ALLOY HIGH STRENGTH STEEL WELDS USING AN ECONOMICAL TECHNIQUE 用经济技术提高低合金高强度钢焊缝抗拉强度的研究

Iraqi Journal for Mechanical and Materials Engineering Pub Date : 2018-11-06 DOI: 10.32852/IQJFMME.V18I3.184

A. Jilabi

{"title":"STUDYING THE IMPROVEMENT OF TENSILE STRENGTH OF LOW ALLOY HIGH STRENGTH STEEL WELDS USING AN ECONOMICAL TECHNIQUE","authors":"A. Jilabi","doi":"10.32852/IQJFMME.V18I3.184","DOIUrl":"https://doi.org/10.32852/IQJFMME.V18I3.184","url":null,"abstract":"Low alloy steels are particularly used in manufacturing several parts in the heavyengineering industries, agricultural equipment and dies which may be subject to servicefailure, and thus may need to be repaired by one of the welding processes. The weldabilityof steels is determined by their sensitivity to cracks that can be prevented by the use ofspecial welding procedures which are often expensive and difficult to use. Manual metal arcwelding of low alloy high strength steels was done firstly, using a cheap electrode (OK46.00), followed by the use of an economical technique which depends on coiling copperwires with different diameters around the cheap electrode. The expensive electrode (OK73.68) was also used for comparison. Results showed an increase in the tensile strength (712MPa) and weld joint efficiency (83.8%) when the expensive iron powder low hydrogencovering electrode (OK 73.68) was used. On the other hand, the tensile strength wasdecreased to (206 MPa) and the weld joint efficiency to (24.2%) when the cheap electrode(OK 46.00) was used. Coiling a (0.6 mm) dia. copper wire around the (OK 46.00) electrodeincreased the tensile strength and weld joint efficiency to (510 MPa) and (60%) respectively.","PeriodicalId":31812,"journal":{"name":"Iraqi Journal for Mechanical and Materials Engineering","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2018-11-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47853922","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

INVESTIGATING INDOOR AIR QUALITY AND THERMAL COMFORT USING DIFFERENT VENTILATION SYSTEMS UNDER IRAQI CLIMATE 研究伊拉克气候条件下不同通风系统的室内空气质量和热舒适性

Iraqi Journal for Mechanical and Materials Engineering Pub Date : 2018-11-06 DOI: 10.32852/IQJFMME.V18I3.177

A. A. Mahdi, S. Abbas

{"title":"INVESTIGATING INDOOR AIR QUALITY AND THERMAL COMFORT USING DIFFERENT VENTILATION SYSTEMS UNDER IRAQI CLIMATE","authors":"A. A. Mahdi, S. Abbas","doi":"10.32852/IQJFMME.V18I3.177","DOIUrl":"https://doi.org/10.32852/IQJFMME.V18I3.177","url":null,"abstract":"Computational Fluid Dynamics (CFD) of indoor environment as well as qualityconsiderations are important element in the study of energy consumption, thermal comfortand indoor air quality in buildings. This paper investigate a comparison work betweenimpinging jet, displacement, and mixing ventilation systems for an isothermal and nonisothermalventilated room for Indoor Air Quality (IAQ) and thermal human comfort underIraqi climate. For IJV system, draught discomfort is the issue of most concern since itsupplies cooled air directly to the occupied zone. This study investigated a number of factorsinfluencing draught discomfort and temperature stratification in an office environment. Theconsidered factors, supply airflow rate and supply air temperature. RNG K-? turbulencemodel was used with the turbulent flow. The second aspect included numerical analyses byadopting ANSYS FLUENT15 code to generate simulation models. A square shaped airsupply device was used with [0.1 times room height (h)] outlet terminal height from the footlevel end. The IJV system proved more efficient than displacement and mixing ventilationsystems. The Air Distribution Performance Index (ADPI) obtained for an isothermal andnon-isothermal ventilated room adopting IJV system gave best values (0.80, 0.83)respectively compared with the other two ventilation systems.","PeriodicalId":31812,"journal":{"name":"Iraqi Journal for Mechanical and Materials Engineering","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2018-11-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48790636","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

CAD DESIGN AND CONTROL OF TRIPLE INVERTED-PENDULUMS SYSTEM 三级倒立摆系统的CAD设计与控制

Iraqi Journal for Mechanical and Materials Engineering Pub Date : 2018-11-06 DOI: 10.32852/IQJFMME.V18I3.183

M. Hussein

{"title":"CAD DESIGN AND CONTROL OF TRIPLE INVERTED-PENDULUMS SYSTEM","authors":"M. Hussein","doi":"10.32852/IQJFMME.V18I3.183","DOIUrl":"https://doi.org/10.32852/IQJFMME.V18I3.183","url":null,"abstract":"This work is aimed to study the dynamic behavior and control of the triple invertedpendulumsystem. A nonlinear dynamic model of the inverted-pendulums fixed on a cart,based on CAD model is developed. The Lagrange equation is used to obtain the nonlineardynamic models of the system. The dynamic model is then linearized around operatingpoint. An augmented dynamic model using the linearized model is also derived. Two controlapproaches are used to stabilize the pendulums in vertical position. First approach: StateFeedback Control based on the linearized model is used to generate the input force control tostabilize the system. Second approach: Model Predictive Control is designed based onaugmented dynamic Model to control the motion of the system. In order to verify thedeveloped model and the chosen controller gains several simulations for different carts’paths are carried out. Several 3D animations are also presented to verify the usefulness ofthe designed CAD model and the controllers. As a future work: the 3D model of the tripleinverted-pendulum system gives a valuable resource for virtual reality work. Beside, anotheradvanced control approach can be applied on the derived dynamic model.","PeriodicalId":31812,"journal":{"name":"Iraqi Journal for Mechanical and Materials Engineering","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2018-11-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45794148","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

EFFECT OF ADDING BORON CARBIDE (B4C) TO POLYMER FOR PRODUCING SURFACE COMPOSITE BY FRICTION STIR PROCESSING 在聚合物中添加碳化硼（B4C）对搅拌摩擦法制备表面复合材料的影响

Iraqi Journal for Mechanical and Materials Engineering Pub Date : 2018-11-06 DOI: 10.32852/IQJFMME.V18I3.178

Bashaer A Habeeb, A. O. Al-Roubaiy

{"title":"EFFECT OF ADDING BORON CARBIDE (B4C) TO POLYMER FOR PRODUCING SURFACE COMPOSITE BY FRICTION STIR PROCESSING","authors":"Bashaer A Habeeb, A. O. Al-Roubaiy","doi":"10.32852/IQJFMME.V18I3.178","DOIUrl":"https://doi.org/10.32852/IQJFMME.V18I3.178","url":null,"abstract":"Friction stir processing (FSP) is a new solid state technique, it is employed for theimprovement of the mechanical properties of a material and the production of surface layercomposites instead of conventional processing technologies. This research aims to study theability of applying Friction Stir Processing (FSP) to modify the surface of high densitypolyethylene (HDPE) reinforcing by B4C with a particle size of 0.4?m, Groove in themiddle of HDPE surface made to fill by B4C. Varity in the groove depth (0.6, 1.2 and1.8)mm used according to B4C ratio on HDPE substrate particles. Friction stir process wascarried out, using tool with cylindrical shape of pin and shoe tool to produce surface layercomposite. The effect of processing parameters including rotational and transverse speeds onthe mechanical properties of composite layer was studied. Wear test results show apronounced improvement in wear resistance of HDPE surface through reinforcementadditions of B4C at a ratio (5%, 10% and 15% ), where wear rate improved by (60%, 71%and 63%) respectively, as compared with as received HDPE, the surface compositeHDPE/B4C have good wear resistance. Hardness test results indicate that the hardness ofcomposite layer reinforced with (5%,10% and 15%) particles improved by( 26%, 35% and28% )respectively as compared with received HDPE. OM revealed that high tool rotationalspeed resulted in homogeneous distribution of B4C particles and vice versa.","PeriodicalId":31812,"journal":{"name":"Iraqi Journal for Mechanical and Materials Engineering","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2018-11-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46166091","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 2

ELECTRODEPOSITION OF COPPER POWDER FROM MIXTURE SULPHATE –CHLORIDE ACIDIC SOLUTION 硫酸盐-氯化物混合酸性溶液电沉积铜粉的研究

Iraqi Journal for Mechanical and Materials Engineering Pub Date : 2018-11-06 DOI: 10.32852/IQJFMME.V18I3.182

S. Jasim

引用次数: 0

EXPERIMENTAL STUDY OF SOLAR CHIMNEY PERFORMANCE FOR PASSIVE HEATING 被动采暖太阳能烟囱性能试验研究

Iraqi Journal for Mechanical and Materials Engineering Pub Date : 2018-11-06 DOI: 10.32852/iqjfmme.v18i3.170

Majid H. Majeed, Ibrahim S Resen

引用次数: 0

HARDNESS AND FRATURE TOUGHNE OF PLASMA SPRAYED ZIRCONIA-CERIA-YTTRIA THERMAL BARRIER COATINGS 等离子喷涂氧化锆-铈-钇热障涂层的硬度和断裂韧性

Iraqi Journal for Mechanical and Materials Engineering Pub Date : 2018-08-04 DOI: 10.32852/IQJFMME.VOL18.ISS2.87

M. Kadhim, M. Hafiz, M. Bash

引用次数: 1

IM PROVEMENT OF MECHANICAL PROPERTIES OF ALUMINUM ALLOY 6061 –T6 WELD JOINT USING DC PULSED GAS TUNGSTEN ARC WELDING (PGTAW) 直流脉冲钨极气体保护焊改善6061-T6铝合金焊接接头力学性能

Iraqi Journal for Mechanical and Materials Engineering Pub Date : 2018-08-04 DOI: 10.32852/IQJFMME.VOL18.ISS2.97

J. M. Naje, N. Dawood, Hamdiyah M Mohammed

{"title":"IM PROVEMENT OF MECHANICAL PROPERTIES OF ALUMINUM ALLOY 6061 –T6 WELD JOINT USING DC PULSED GAS TUNGSTEN ARC WELDING (PGTAW)","authors":"J. M. Naje, N. Dawood, Hamdiyah M Mohammed","doi":"10.32852/IQJFMME.VOL18.ISS2.97","DOIUrl":"https://doi.org/10.32852/IQJFMME.VOL18.ISS2.97","url":null,"abstract":"The effect of DC pulsed GTAW method factors on mechanical properties of Aluminumalloys 6061–T6 is proves. Throbbed GTAW on the sheet having dimension of (200* 100*5mm) is implemented at variable pulse current (150, 160, 170, 190) and constant frequencyto get numerous connected joints by electrode type\" ER4043 (Al Si5) as a padding metallicand argon as protective gas and compared with base current GTAW welding at D C currentat 90 amps. The welded pieces are examined by X-ray radiography. The welded joints weretreated by heat, the joints heated for half an hour in the furnace to 150 C° then cooled in theair to release the residual stresses. Mechanical quality of the weld joints. Microstructuralcategorizations, Micro hardness, enduring stress are examined. Consequences exposed thata common decline of mechanical properties of TIG welded joints conveyed 34% analogieswith parent metal while the PGTAW joined offers better mechanical qualities analogy withof TIG joined in reductions conveyed 8.4% analogies with original metal this is because ofthe microstructure variations through the joining method and compressive residual stressgeneration in the weld zones. It has been found that by PGTAW improved the mechanicalproperties of welded joints which rely on current parameters.","PeriodicalId":31812,"journal":{"name":"Iraqi Journal for Mechanical and Materials Engineering","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2018-08-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43008376","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

OPTIMUM BUCKLING DESIGN OF CYLINDRICAL STIFFENER SHELL UNDER EXTERNAL HYDROSTATIC PRESSURE 外静水压力下圆柱加劲壳的优化屈曲设计

Iraqi Journal for Mechanical and Materials Engineering Pub Date : 2018-08-04 DOI: 10.32852/IQJFMME.VOL18.ISS2.91

Rawa Hamed M. Al-Kalali

{"title":"OPTIMUM BUCKLING DESIGN OF CYLINDRICAL STIFFENER SHELL UNDER EXTERNAL HYDROSTATIC PRESSURE","authors":"Rawa Hamed M. Al-Kalali","doi":"10.32852/IQJFMME.VOL18.ISS2.91","DOIUrl":"https://doi.org/10.32852/IQJFMME.VOL18.ISS2.91","url":null,"abstract":"This paper present an investigation of the collapse load in cylinder shell under uniformexternal hydrostatic pressure with optimum design using finite element method viaANSYS software. Twenty cases are studied inclusive stiffeners in longitudinal and ringstiffeners. Buckling mode shape is evaluated. This paper studied the optimum designgenerated by ANSYS for thick cylinder with external hydrostatic pressure. The primarygoal of this paper was to identify the improvement in the design of cylindrical shell underhydrostatic pressure with and without Stiffeners (longitudinal and ring) with incorporativetechnique of an optimization into ANSYS software. The design elements in this researchwas: critical load, design variable (thickness of shell (TH), stiffener’s width (B) andstiffener’s height (HF). The results obtained illustrated that the objective is minimizedusing technique of numerical optimization in ANSYS with optimum shell thickness andstiffener’s sizes. In all cases the design variables (thickness of shell) was thicker than themonocoque due to a shell’s thicker is essential to achieve the strength constraints. It can beconcluded that cases (17,18,19, and 20) have more than 90% of un-stiffened critical load.The ring stiffeners causes increasing buckling load than un-stiffened and longitudinalstiffened cylinder.","PeriodicalId":31812,"journal":{"name":"Iraqi Journal for Mechanical and Materials Engineering","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2018-08-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42004635","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 2

PREPARATION AND INVESTIGATION OF SOME MECHANICAL PROPERTIES OF UNSATURATED POLYESTER RESIN REINFORCED BY HYBRID NANOPARTICLES 杂化纳米粒子增强不饱和聚酯树脂的制备及力学性能研究

Iraqi Journal for Mechanical and Materials Engineering Pub Date : 2018-08-04 DOI: 10.32852/IQJFMME.VOL18.ISS2.98

S. Salih, W. B. Salih, H. Hamad

{"title":"PREPARATION AND INVESTIGATION OF SOME MECHANICAL PROPERTIES OF UNSATURATED POLYESTER RESIN REINFORCED BY HYBRID NANOPARTICLES","authors":"S. Salih, W. B. Salih, H. Hamad","doi":"10.32852/IQJFMME.VOL18.ISS2.98","DOIUrl":"https://doi.org/10.32852/IQJFMME.VOL18.ISS2.98","url":null,"abstract":"In this study, nano-composite of polymeric materials, prepared from unsaturated polyesterresin (UP). Two groups of nanocomposites were prepared by Hand Lay-up method. The firstgroup consists from (UP) reinforced by hybrid nanoparticles consisting of a mixture ofzirconium oxide and yttrium oxide (30 mol%Y2O3- ZrO2) with particles size (83.98nm). Thesecond group consists of (UP) reinforced by zirconia nanoparticles (ZrO2) with particle size(47.23nm). The effect of volume fraction (0.5%, 1%, 1.5%, 2%, 2.5%, 3%) of thenanoparticles additives on some mechanical properties of composites materials was studiedalso. The results shown that the values of the flexural modulus, impact strength and fracturetoughness increased, as the volume fraction ratio of the nanoparticle increased for bothgroups of nanocomposites, while flexural strength values decreased with the increased thevolume fraction ratio of the nanoparticles for both groups of nanocomposites also. As wellas, the unsaturated polyester resins reinforced by hybrid nanoparticles has higher mechanicalproperties as compared with their counterparts of composites reinforced by zirconiananoparticles only. The morphological formation of the fracture surface showed a closeinterconnection between all components of the prepared polymeric compositions. Thisreinforce a good compatibility between unsaturated polyester resins and reinforcementnanoparticles, which enhancement the mechanical properties.","PeriodicalId":31812,"journal":{"name":"Iraqi Journal for Mechanical and Materials Engineering","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2018-08-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42454524","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1