Iraqi Journal for Mechanical and Materials Engineering最新文献_第10页

E XPERIMENTAL AND NUMERICAL STUDY OF 6061-T6 AL- ALLOY FATIGUE LIFE USING FRICTION STIR WELDING 6061-T6铝合金搅拌摩擦焊疲劳寿命的试验与数值研究

Iraqi Journal for Mechanical and Materials Engineering Pub Date : 2018-08-04 DOI: 10.32852/IQJFMME.VOL18.ISS2.93

Ethar Mohamed Mahdi Mubarak

{"title":"E XPERIMENTAL AND NUMERICAL STUDY OF 6061-T6 AL- ALLOY FATIGUE LIFE USING FRICTION STIR WELDING","authors":"Ethar Mohamed Mahdi Mubarak","doi":"10.32852/IQJFMME.VOL18.ISS2.93","DOIUrl":"https://doi.org/10.32852/IQJFMME.VOL18.ISS2.93","url":null,"abstract":"Welded parts are often subjected to variable loads. Paper’s aim is to evaluate the fatiguecharacteristics of friction stir welding of AA6061-T6 alloy under variable loading andobserved the influence of heat treatment for friction stir welding joint on the fatigue stressanalysis. The microstructure of the welds alloy are studied before and after heat treatment.The friction stir welding was employed using milling machine with constant tool rotation(1000 rpm) and feed rate (20 mm/min). Artificial aging are made for aluminum friction stirwelded alloy using electrical furnace at temperature of 500ºC for 20 min. Quenching at190ºC for 4 hr. via water is followed the aging process. Fatigue test were done for specimens(base metal, friction stir welding alloys before and after heat treatment) to obtain the S-Ncurves for each case. Finite element via ANSYS software is used to analysis the FSW(temperature, Von-Mises stress, deformation in the welded zone and contact friction stressdistributions) and Fatigue test (fatigue life, fatigue damage, fatigue safety factor, biaxialityindication , equivalent alternating stress and stress intensity factors) where the generalthermo-elasto plastic relation produced under thermal and mechanical loads with isotropic,kinematic and mixed hardening rule in three dimensional problems is proposed. The resultsshown that the heat treatment for the friction stir welded alloy would be increased thefatigue strength of the welded plate that the number of cycles of base metal (AA6061-T6)was 1.2×106 and the number of cycle for welded joints without heat treatment was(0.9×106), where the number of cycles was 1×107 with heat treatment with quenching within4hr. also it can be concluded that, the fracture opening mode (mode I) is exist in the unheated welded alloy and disappeared with heating treatment","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":"43707051","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

IDENTICAL PARALLEL MACHINES SCHEDULING USING GENETIC ALGORITHM 基于遗传算法的相同并行机调度

Iraqi Journal for Mechanical and Materials Engineering Pub Date : 2018-08-04 DOI: 10.32852/IQJFMME.VOL18.ISS2.96

A. J. Haleel

{"title":"IDENTICAL PARALLEL MACHINES SCHEDULING USING GENETIC ALGORITHM","authors":"A. J. Haleel","doi":"10.32852/IQJFMME.VOL18.ISS2.96","DOIUrl":"https://doi.org/10.32852/IQJFMME.VOL18.ISS2.96","url":null,"abstract":"Minimizing the scheduling production time consider one of the most important factors forcompanies which their objectives is achieve the maximum profits. This paper studies theidentical parallel machine scheduling problem which involves the assignment numbers ofjob (N) to set of identical parallel machine (M) in order to minimize the makespan(maximum completion time of all job). There are numerous troubles in solving the largesize of “parallel machine scheduling” problem with an excessive jobs and machines, sothe genetic algorithm was proposed in this paper which is consider an efficient algorithmthat fits larger size of identical “parallel machine scheduling” for minimizing themakespan. Most studies in the scheduling field suppose setup time is insignificant orincluded in the processing time, in this paper both the sequence independent setup timesand processing time were considered. The solutions of algorithms are coding in(MATLAB). A numerical example of (11) jobs are schedule on (3) machines todemonstrative the effectiveness of algorithm solution. The result show the algorithm caneffectively solve large size of scheduling problem and given the best schedule withminimum makespan.","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":"45833384","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

EFFECT OF TIC AND B4C ON MECHANICAL PROPERTIES OF AA7075 ALLOY FABRICATED BY POWDER METALLURGY TIC和B4C对粉末冶金AA7075合金力学性能的影响

Iraqi Journal for Mechanical and Materials Engineering Pub Date : 2018-08-04 DOI: 10.32852/IQJFMME.VOL18.ISS2.95

Raad H. Majid

{"title":"EFFECT OF TIC AND B4C ON MECHANICAL PROPERTIES OF AA7075 ALLOY FABRICATED BY POWDER METALLURGY","authors":"Raad H. Majid","doi":"10.32852/IQJFMME.VOL18.ISS2.95","DOIUrl":"https://doi.org/10.32852/IQJFMME.VOL18.ISS2.95","url":null,"abstract":"In this work, aluminum metal matrix composites (AMMCs) were fabricated by usingpowder metallurgy. AA7075 powder is reinforced with two different ceramic particles(TiC,B4C) with different weight fractions (2.5, 5, 7.5 and 10 wt.%). The composites wereproduced by powder metallurgy by preparing the powder, mixing, compacting andsintering. The particle size of unreinforced AA7075 about 100μm, while particle size ofeach TiC and B4C about 150 μm. The mixing process was done by planetary mixing setuprotating at 250 rpm for 2hr. by adding zinc stearate as an activator material with steel ballmilling. However the mixture was compacted by hydraulic uniaxial press type (LeyboldHarris No.36110) about 200 kg/cm² according to (ASTM-D 618). After compactingprocess, the mixture sintered at 475 °C for 2hr. by using electrical furnace with argonatmosphere.There are many examinations and tests were carried out for the synthesized compositesmaterial (AA7075/ TiC and AA7075/ B4C) such as examination of the microstructure,mechanical tests such as hardness and compressive strength, physical tests such asdensity and porosity.The results of this work showed that improving in physical properties (theoreticaldensity, experimental density, porosity) and mechanical properties (Rockwell hardnessand Compressive strength)","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":"49638871","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

MICROSTRUCTUR AND MICROHARDNESS OF LASER CLADDING Ni BASED ON COLD ROLLED STEEL 激光熔覆镍基冷轧钢的组织与显微硬度

Iraqi Journal for Mechanical and Materials Engineering Pub Date : 2018-08-04 DOI: 10.32852/IQJFMME.VOL18.ISS2.85

M. Bash, A. M. Mustfa, Ali M Resan, F. F. Sayyid, A. I. Mohammed

{"title":"MICROSTRUCTUR AND MICROHARDNESS OF LASER CLADDING Ni BASED ON COLD ROLLED STEEL","authors":"M. Bash, A. M. Mustfa, Ali M Resan, F. F. Sayyid, A. I. Mohammed","doi":"10.32852/IQJFMME.VOL18.ISS2.85","DOIUrl":"https://doi.org/10.32852/IQJFMME.VOL18.ISS2.85","url":null,"abstract":"A study is reported of the laser cladding of a nominal composition of Ni 5 wt% Al on coldrolled low carbon steel (0.16 wt% C), using a high power continuous CO2 laser. The severerolled microstructure of steel was changed considerably at the heat affected zones under allspecific energies. The cladded coatings showed the presence of ɣ solid solution and β(NiAlFe) phases. Sound metallurgical bonding with absence of porosity and cracks wasobserved between the substrate and the clad coat at specific energy higher than 80 J/mm2.The ferrite and pearlite microstructure of the substrate was changed to martensite at the regionadjacent to the clad interface. It followed by large grains of austenite/ferrite and pearlite(grain growth zone), fine grains of austenite/ferrite and pearlite (recrystallization zone) andvery small zone of relatively small change of cold structure (recovery zone). The last zonewas confirmed by micro hardness as a recovery zone.This investigation confirms clearly the possibility of formation different structures of graingrowth, recrystallization and recovery at the laser heat affected cold rolled low carbon steel.The observed results suggest the developing of a new technique to obtain tentativefunctionally graded material.","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":"43558067","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

THE EFFECT OF TiO2 AS ADDITIVES ON PROPERTIES OF COMPOSITE MgO FOR BONE REPAIR TiO2对骨修复用复合MgO性能的影响

Iraqi Journal for Mechanical and Materials Engineering Pub Date : 2018-08-04 DOI: 10.32852/IQJFMME.VOL18.ISS2.88

I. Sabree

引用次数: 0

IMPROVING RUTTING RESISTANCE OF HOT MIX ASPHALT BY DATES KERNEL POWDER 椰枣仁粉改善热拌沥青抗车辙性能

Iraqi Journal for Mechanical and Materials Engineering Pub Date : 2018-08-04 DOI: 10.32852/iqjfmme.vol18.iss2.94

S. Neham

{"title":"IMPROVING RUTTING RESISTANCE OF HOT MIX ASPHALT BY DATES KERNEL POWDER","authors":"S. Neham","doi":"10.32852/iqjfmme.vol18.iss2.94","DOIUrl":"https://doi.org/10.32852/iqjfmme.vol18.iss2.94","url":null,"abstract":"In Iraq, the significant increase in the number of passenger cars and trucks (increased inaxle loads) in addition to the unprecedented rise of temperature in the summer hasincreased the risk of permanent deformation of flexible pavement (Rutting) in recenttimes. Lower costs maintenance and extending serves life of flexible pavements are themain objectives of this study by improving rut resisting of it using the waste locallyavailable materials (Dates Kernel Powder).The Superpave design criteria is used to determine optimum asphalt content at 4% airvoids for hot mix with Lime Stone Dust and Dates Kernel Powder as a filler materials tothree types of aggregate blend. Preparing 54 samples with dimension (400*300*50) mmat 110˚C compacted temperature to test it by Wheel-Tracking device at 40˚C, 50˚C and60˚C. Based on wheel-tracking device results, it can be show that there was a significantdecrease in the value of the Rut Depth when using the Dates Kernel Powder as analternative to Lime Stone Dust as a filler materials in Hot Mix Asphalt and it can be usedto improve the rut resisting; the maximum percent of reduction is 67.71 after 3000 cycleof passing at 60ºC and 49.35 as a minimum percent of reduction after 5000 cycle at 40ºCtested temperature, then it can be seen that the impact of Hot Mix Asphalt with DatesKernel Powder is less at high temperatures than mixes with Lime Stone Dust on RutDepth value.","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":"44820668","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

THE EFFECT OF NATURAL MATERIALS ON MECHANICAL PROPERTIES OF COMPOSITE MATERIALS 天然材料对复合材料力学性能的影响

Iraqi Journal for Mechanical and Materials Engineering Pub Date : 2018-08-04 DOI: 10.32852/iqjfmme.vol18.iss2.84

A. A. Mohammed, Ashraq A R Kadhum

引用次数: 0

THE INFLUENCE OF LASER PEENING PULSE NUMBER ON HARDNESS, RESIDUAL STRESS AND ADHESIVE WEAR OF AISI 316l STAINLESS STEEL 激光喷丸脉冲数对AISI 316l不锈钢硬度、残余应力和粘着磨损的影响

Iraqi Journal for Mechanical and Materials Engineering Pub Date : 2018-08-04 DOI: 10.32852/iqjfmme.vol18.iss2.99

A. Almohaisen

引用次数: 0

EXPERIMENTAL AND NUMERICAL STUDY OF NATURAL CONVECTION BETWEEN TILTED WALLS WITH ATTACHED FINS 附翼倾斜壁面间自然对流的实验与数值研究

Iraqi Journal for Mechanical and Materials Engineering Pub Date : 2018-08-04 DOI: 10.32852/IQJFMME.VOL18.ISS2.92

K. Jehhef, M. Siba

{"title":"EXPERIMENTAL AND NUMERICAL STUDY OF NATURAL CONVECTION BETWEEN TILTED WALLS WITH ATTACHED FINS","authors":"K. Jehhef, M. Siba","doi":"10.32852/IQJFMME.VOL18.ISS2.92","DOIUrl":"https://doi.org/10.32852/IQJFMME.VOL18.ISS2.92","url":null,"abstract":"The free convection between two tilted adiabatic plates with centered heated horizontalcylinder with attached plate fin was investigated experimentally and numerically. Theexperimental rig constructed from vertical adiabatic was filled with air plates with aspectratio of (A= 12) tilted by angles of (15o, 30o, 45o, 60o, 75o, and 90o). A horizontal heatedcylinder with diameter of (16 cm) subjected under constant heat flux of (100, 500, 700, and1000 W/m2), the Rayleigh number ranging from (3.5 ×107 to 4.5 ×109). At the bottom of therig left an opining with distance of (2, 4, 6, and 8 cm) but the upper left open to theatmosphere. The tested cases was of (without fin, smooth, triangular, square, and semi-circlefin) was attached to the right wall of the cavity. The numerical solution of the case wasperformed by solving the governing equations by ANSYS-FLUENT 14.0 package thatdependent upon the finite volume method. The experimental results show that the Nusseltnumber increases with increasing Rayleigh number, decreasing the inclination angle,increasing heat flux and with increasing the bottom opining distance. Basically, the resultsshowed that the using fins with any geometry will lead to increase the heat transfer rate. Theoptimum increasing in the Nusselt number was found by using triangular plat fin. Finally,the experimental data was compared with a numerical calculation and found that there is agood agreement in the same conditions.","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":"44783806","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

INVESTIGATION SOME PROPERTIES OF (ZN-NI-SIC) COMPOSITES COATING ON LOW CARBON STEEL 研究了低碳钢表面(zn-ni-sic)复合涂层的一些性能

Iraqi Journal for Mechanical and Materials Engineering Pub Date : 2018-08-04 DOI: 10.32852/IQJFMME.VOL18.ISS2.100

Abdalwahid K. Rajih, J. Ahmed, N. S. Radhi

引用次数: 2