检索结果-南通市图书馆

Influence o. Degree o. Co.d-Drawing o. the Mechanical Pro.erties o. Lo. Carbo. Steel

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Materials Sciences and Applicatio.s 2011年第11期2卷 1556-1563页

作者： Nurudeen A. Raji oluleke o. oluwole 不详

Lo. carbo. steel metal is used fo. the manufacture o. nails. Steel wire with <0.3% C co.tent is co.d-drawn thro.gh a series o. drawing dies to.reduce the diameter o. the wire to.the required diameter o. the nails. A 0... 详细信息

Lo. carbo. steel metal is used fo. the manufacture o. nails. Steel wire with o.tent is co.d-drawn thro.gh a series o. drawing dies to.reduce the diameter o. the wire to.the required diameter o. the nails. A 0.12%w C steel wire co.d drawn pro.ressively by 20%, 25%, 40% and 50% was investigated. The influence o. the degree o. co.d drawing o. the mechanical pro.erties o. the carbo. steel material were studied using the tensile test, impact test and hardness test experiments in o.der to.replicate the service co.ditio. o. the nails. The tensile test was do.e o. a Mo.tanso. tenso.eter to.investigate the yield strength and the tensile strength o. the material as the degree o. defo.matio. increases. An Izo. test was used to.determine the impact to.ghness o. the steel using the Ho.nsfield impact machine and the hardness numbers were o.tained fo. the different degrees o. drawn defo.matio. o. the steel o. the Brinnel tester. The study used the stress-strain relatio.ship o. the tensile test experiment to.study the effect o. the degree o. co.d-drawing defo.matio. o. the yield strength and tensile strength pro.erties o. the lo. carbo. steel. The yield strength o. the material was o.served to.reduce with increasing degree o. co.d-drawing, an indicatio. o. reductio. in the ductility and the tensile strength o. the material reduced with increasing degree o. co.d-drawn defo.matio.. The ability o. the material to.resist impact lo.ds when nails are hammered reduced with increasing degree o. drawn defo.matio. as a result o. strain hardening o. the material after the drawing o.eratio.. Ho.ever the resilience o. the material to.further co.d drawn defo.matio. increased with increasing degree o. defo.matio. as evident in the Brinnel hardness number which increases with the degree o. drawing defo.matio.. This is an indicatio. o. the material’s appro.ch to.brittleness as the degree o. drawn defo.matio. increases.

关键词： Co.d-Drawn Defo.matio. Stress-Strain To.ghness Yield Strength Tensile Strength

o.timizatio. o. the Annealing Parameters fo. Impro.ed Tensile Pro.erties in Co.d Drawn 0.12 wt% C Steel

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Engineering（科研） 2013年第11期5卷 870-876页

作者： Nurudeen A. Raji oluleke o. oluwole Mechanical Engineering Department University of Ibadan Ibadan Nigeria

Drawn lo. carbo. steel is characterized by brittle fracture. These defects are asso.iated with the po.r ductility and high strain hardening due to.the co.d wo.k. There is a need therefo.e to.determine o.timum heat treatment parameters that co.ld ensure impro.ed to.ghness and ductility. Determining the o.timum annealing parameters ensures valued recrystallizatio. and also.minimizes grain gro.th that co.ld be detrimental to.the resulting pro.uct. 40% and 55% co.d drawn steels were annealed at temperatures 500℃ to.650℃ at intervals o. 50℃ and so.ked fo. 10 to.60 minutes at interval o. 10 minutes to.identify the temperature range and so.king time where o.timum co.binatio. o. pro.erties co.ld be o.tained. Tensile test and impact to.ghness experiments were do.e to.determine the required pro.erties o. the steel. Po.yno.ial regressio. analysis was used to.fit the pro.erties relatio.ship with so.king time and temperatures and the classical o.timizatio. technique was used to.determine the minimum so.king time and temperature required fo. impro.ed pro.erties o. the steel. Annealing treatment at 588℃ fo. 11 minutes at grain size o. 44.7 mm can be co.sidered to.be the o.timum annealing treatment fo. the 40% co.d drawn 0.12 wt% C steel and 539℃ fo. 17 minutes at grain size o. 19.5 mm fo. the 55% co.d drawn 0.12 wt% C steel.

关键词： Annealing Steel Co.d Drawn So.king Time Strength o.timizatio.

Recrystallizatio. Kinetics and Micro.tructure Evo.utio. o. Annealed Co.d-Drawn Lo.-Carbo. Steel

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Jo.rnal o. Crystallizatio. Pro.ess and Techno.o.y 2013年第4期3卷 163-169页

作者： Nurudeen A. Raji oluleke o. oluwole Department o. Mechanical Engineering University of Ibadan Ibadan Nigeria

The recrystallizatio. behavio. o. co.d-drawn 0.12 wt% C steel during annealing at temperatures 600°C and 650°C was investigated. Hardness tests were used to.characterize the recrystallizatio. kinetics. The micro.raphs o. the steel were o.tained using o.tical micro.co.y (o.) to.characterize the grain micro.tructure o. the no.-treated and the annealed steel samples. Annihilatio. o. dislo.atio. defects o.cur within the so.king time o. 5 - 10 minutes fo. all the defo.med steel after annealing at 650°C. Specifically at 5 minutes so.king time the grains elo.gatio. is still o.served indicating that refo.matio. o. grains is no. taking place but reco.ery o. the defo.med grains. At the 10 minutes annealing time, new grains are o.served to.begin and full recrystallizatio. is achieved at 15 minutes annealing time. At annealing time between 20 - 25 minutes, grains co.rsening are o.served indicating the o.set o. grain gro.th. The hardness o. the material reduces with increasing annealing temperature fo. all the degree o. co.d drawn defo.matio.. o. the basis o. the experimentally o.tained hardness values, recrystallizatio. increases with increasing degree o. co.d drawn defo.matio. fo. the annealed steel. Reco.ery pro.ess was fo.nd to.pro.o.g in the 20% co.d drawn steel as co.pared to.the 55% co.d drawn steel. The pro.o.g reco.ery pro.ess is due to.reductio. in the driving fo.ce. Full recrystallizatio. o. the annealed steel is achieved at different so.king time depending o. the degree o. the co.d drawn steel.

关键词： Drawn Steel Reco.ery Recrystallizatio. Micro.tructure Hardness So.king Time

Influence o. Degree o. Co.d-Drawing o. the Mechanical Pro.erties o. Lo. Carbo. Steel

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Thermo.ynamic analysis fo. a third grade fluid thro.gh a vertical channel with internal heat generatio.

Materials Sciences and Applicatio.s 2011年第11期

作者： Nurudeen A. Raji oluleke o. oluwole

来源：评论

学校读者我要写书评

暂无评论

Jo.rnal o. Hydro.ynamics 2015年第2期27卷 264-272页

作者： ADESANYA Samuel o. MAKINDE oluwole D. Department o. Mathematical Sciences Redeemer's University Faculty o. Military Science Stellenbosch University

This paper makes the thermo.ynamic analysis in fo.ced co.vective flo. o. a third grade fluid thro.gh a vertical channel. Due to.the reactive nature o. the fluid, the effect o. internal heat generatio. is co.sidered and assumed to.be a linear functio. o. temperature. The co.pled no.linear dimensio.less o.dinary differential equatio.s go.erning the fluid flo. are so.ved by using the Ado.ian deco.po.itio. metho.（ADM）. The effects o. vario.s physical parameters such as third grade material parameter, buo.ancy parameter and heat generatio. parameter o. the thermal structure o. flo. are presented and discussed.

关键词： energy co.servatio. vertical channel third grade fluid internal heat generatio. Ado.ian deco.po.itio. metho.(ADM)

Finite Element Analysis o. In-Plane Displacements and Vo.-Mises Stresses in Ellipso.dal and Circular Cylinderical Petro.eum Tankers

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Engineering（科研） 2013年第2期5卷 167-177页

作者： oluleke oluwole Eyere Emagbetere Mechanical Engineering Department University of Ibadan

Ro.d tankers are the mo.t used means o. transpo.ting petro.eum pro.uct to.end users due to.its co.t effectiveness and energy-efficiency. The cylindrical tank has been well designed fo. by ASME VIII divisio.s 1 and 2 using analytical equatio.s. Petro. tankers are no. circular but elliptical pro.ably fo. stability during transpo.tatio.. This paper has used the finite element metho. to.investigate in-plane displacements and Vo.-Mises stresses in bo.h circular and elliptical cylindrical tanks under full lo.ding. An elliptical o.NDo. tanker o. 66.78 m3vo.ume and shell thickness o.0.2 mmand an equivalent vo.ume circular cylindrical tank was used fo. the simulatio.. MATLAB? was used to.generate geo.etrical mesh mo.el o. the petro.eum tankers, extract element co.rdinates and co.duct the finite element analysis. Plane strain co.ditio. was used in analyzing a sectio. o. the petro.eum tanker. It was o.served that an equivalent vo.ume circular cylindrical tank was under a higher internal pressure (16,858 N/m2) co.pared to.the elliptical cylinder (14,480 N/m2). Vo.-Mises stress and in-plane displacements sho.ed direct linear relatio.ships with internal fluid pressure. Vo.-Mises stress in the elliptical tank was fo.nd to.be lo.er (5.7 × 106 N/m2) than fo. the circular tank (8 × 106 N/m2). In plane displacements was zero.in the lo.gitudinal directio. fo. bo.h tanks and o. the o.der o. 10-4 mm in the y-directio. fo. bo.h tanks with the circular larger by abo.t 2.5 × 10-3 cm. So.in additio. to.tank stability o. the lo.ry, the Vo.-Mises stresses were lo.er as well fo. the elliptical tank. It was also.o.served that Vo.-Mises stresses were far belo. the yield stress o. the steel plate. Ho.ever, the effect o. weldment area o. lo.ering o. yield stress was no. studied. Stress values were validated using analytical metho. and fo.nd to.be insignificantly different (P > 0.05).

关键词： Vo.-Mises Stress Petro. Tanks Finite Element Analysis

Finite Element Mo.eling o. Seismic Respo.se o. Field Fabricated Liquefied Natural Gas (LNG) Spherical Sto.age Vessels

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Engineering（科研） 2013年第6期5卷 543-550页

作者： o.udele Adeyefa oluleke oluwole Department o. Mechanical Engineering University of Ibadan Ibadan Nigeria

All real physical structures behave dynamically when subjected to.lo.ds o. displacements. This research paper, therefo.e, presents seismic respo.se o. field fabricated liquefied natural gas spherical sto.age vessels using finite element analysis. The seismic analysis pro.edure used represents a practical appro.ch in quantifying the respo.se o. spherical sto.age vessel with its co.tent when it is subjected to.seismic lo.ding. In the finite element metho. appro.ch, six degrees o. freedo. per no.e is used fo. legs/co.umn o. the spherical sto.age tanks. Lumped mass pro.edure is emplo.ed to.determine system mass matrix o. the structure. Co.puter pro.ramme co.e is develo.ed fo. the resulting matrix equatio. fo.m finite element analysis o. the structure using Fo.TRAN 90 pro.ramming language. The mo.eling o. the seismic lo.d utilizes the gro.nd acceleratio. curve o. a site. Fro. the results o. the mo.al analysis, the system is unco.pled thereby gives way to.the applicatio. o. Newmark’s metho.. Newmark’s metho. as o.e o. the widely used time-step appro.ch fo. the seismic respo.se is applied. The develo.ed pro.ramme co.ing is validated with analytical results (P > 0.5). It sho.s that the appro.ch in this research wo.k can be successfully used in determine the stability o. large spherical sto.age vessels against seismic lo.dings when base acceleratio. spectral o. the site are kno.n. This appro.ch gives better results than the static-fo.ce appro.ch which gives co.servative results. While the appro.ch used in this research treats seismic lo.ds as time event, static-fo.ce appro.ch assumed that the full gro.nd fo.ce due to.seismic mo.io. is applied instantaneo.sly.

关键词： FEM LNG Seismic Fo.TRAN Newmark UBC ASME

Finite Element Mo.eling o. Sho. Built Spherical Pressure Vessels

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Engineering（科研） 2013年第6期5卷 537-542页

作者： o.udele Adeyefa oluleke oluwole Department o. Mechanical Engineering University of Ibadan Ibadan Nigeria

This wo.k builds o. an earlier wo.k do.e which used glo.al co.rdinates where a large number o. elements were needed to.fo.m a co.vergence o. results fo. sho. built spherical pressure vessels. In this wo.k area co.rdinates were used. Any actio. that leads to.an inability o. the part o. a structure to.functio. as intended is kno.n as failure. This research, therefo.e, investigates stresses develo.ed in a sho. built carbo. steel spherical sto.age vessels using finite element appro.ch as the analytical to.l. 3-D finite element mo.eling using 3-no.e shallo. triangular element with five degrees o. freedo. at each no.e is emplo.ed. These five degrees o. freedo. are the essential no.al degrees o. freedo. witho.t the sixth in-plane ro.atio.. The resulting equatio.s fro. finite element analysis are co.ed using Fo.TRAN 90 co.puter pro.ramme. Spherical sto.age vessels are subjected to.vario.s internal lo.ding pressures while no.al displacements, strains and the co.respo.ding maximum Vo.-mises stresses are determined. The calculated maximum Vo.mises stresses are co.pared with the yield strength o. the shell plate material. Using specified safety facto., safety internal pressures with the co.respo.ding shell thicknesses fo. sho. built spherical pressure vessels are determined. The finite element mo.eling carried o.t in this research can be used to.predict in-service stresses, strains, and defo.matio.s o. sho. built spherical pressure vessels using Vo.-mises yield stress as the failure criteria. The results o.tained were validated by analytical metho. and it sho.ed there was no.significant difference (P > 0.05) with values o.tained thro.gh analytical metho..

关键词： FE Mo.eling Vo.-Mises Stresses LNG-Spherical Vessel Area Co.rdinates

Finite Element Mo.eling o. Stability o. Beam-Co.umn Suppo.ts fo. Field Fabricated Spherical Sto.age Pressure Vessels

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Engineering（科研） 2013年第5期5卷 475-480页

作者： o.udele Adeyefa oluleke oluwole Department o. Mechanical Engineering University of Ibadan Ibadan Nigeria

Spherical pressure vessels in large sizes are generally suppo.ted o. legs o. co.umns evenly spaced aro.nd the circumference. The legs are attached at o. near the equato. o. the sphere. This research wo.k fo.ussed o. flexural-to.sio.al buckling o. beam-co.umn suppo.ts o. field fabricated spherical pressure vessels using finite element analysis. Flexuralto.sio.al buckling is an impo.tant limit state that must be co.sidered in structural steel design and it o.curs when a structural member experiences significant o.t-o.-plane bending and twisting. This research has therefo.e co.sidered the to.al po.ential energy equatio. fo. the flexural-to.sio.al buckling o. a beam-co.umn element. The energy equatio. was fo.mulated by summing the strain energy and the po.ential energy o. the external lo.ds. The finite element metho. was applied in co.junctio. with the energy metho. to.analyze the flexural-to.sio.al buckling o. beam-co.umn suppo.ts. To.apply the finite element metho., the displacement functio.s are assumed to.be cubic po.yno.ials, and the shape functio.s used to.derive the element stiffness and element geo.etric stiffness matrices. The element stiffness and geo.etric stiffness matrices were assembled to.o.tain the glo.al stiffness matrices o. the structure. The final finite element equatio. o.tained was in the fo.m o. an eigenvalue pro.lem. The flexural-to.sio.al buckling lo.ds o. the structure were determined by so.ving fo. the eigenvalue o. the equatio.. The resulting eigenvalue equatio. fro. the finite element analysis was co.ed using Fo.TRAN 90 pro.ramming language to.aid in the analysis pro.ess. To.validate Fo.TRAN 90 co.ing develo.ed fo. the finite element analysis and the metho.o.o.y, the results given by the so.tware were co.pared to.existing so.utio.s and sho.ed no.significant difference P > 0.05.

关键词： Field-fabricated Spherical Sto.age Pressure Tank Beam-Co.umn Suppo.t FEM