نتایج جستجو برای: hardness strength

تعداد نتایج: 229077  

Journal: :TRANSACTIONS OF THE JAPAN SOCIETY OF MECHANICAL ENGINEERS Series A 1986

2014
M. D. Taylor K. S. Choi X. Sun D. K. Matlock L. Xu F. Barlat

Nanoindentation measurements were obtained on eight commercially-produced DP980 dual-phase steels to quantify the hardness of the individual constituents, ferrite and martensite, in each steel. Each microstructure was also evaluated to determine grain size, martensite volume fraction (MVF), and retained austenite content. Nanoindentation hardnesses and quantitative microstructural measurements ...

Journal: :international journal of advanced design and manufacturing technology 0
v. tavakoli university of tehran, iran ghader faraji university of tehran m. afrasiab university of tehran, iran m. m. mashhadi university of tehran, iran

severe plastic deformation (spd) methods were developed for producing of metals and alloys with ultrafine grained (ufg) microstructures having high strength. parallel tabular channel angular pressing (ptcap) as a noble severe plastic deformation (spd) method was used to produce ultrafine grained (ufg) and nanostructured cu-30%zn tubes. in this paper, the effect of ptcap process temperature on t...

Journal: :The journal of contemporary dental practice 2012
Johnson Campideli Fonseca Aloisio Oro Spazzin Lucas Zago Naves Ana Rosa Costa Lourenco Correr-Sobrinho Guilhereme Elias Pessanha Henriques

AIM To evaluate the mechanical properties (ultimate tensile strength, elongation and hardness) of the commercially pure titanium (cp Ti) as casting and after ceramic firing cycles. MATERIALS AND METHODS Dumbbell-shaped specimens were prepared for the tensile strength testing. Disk-shaped cast specimens were used for microhardness testing. The ceramic firing cycles were made simulating a low f...

Journal: :International endodontic journal 2007
M H Nekoofar G Adusei M S Sheykhrezae S J Hayes S T Bryant P M H Dummer

AIM To examine the effect of condensation pressure on surface hardness, microstructure and compressive strength of mineral trioxide aggregate (MTA). METHODOLOGY White ProRoot MTA (Dentsply Tulsa Dental, Johnson City, TN, USA) was mixed and packed into cylindrical polycarbonate tubes. Six groups each of 10 specimens were subjected to pressures of 0.06, 0.44, 1.68, 3.22, 4.46 and 8.88 MPa respe...

Sabet, H., Razavi, A.S. ,

In this research, the FSW Butt joint of commercial aluminum 1050 was investigated by using the 7075 aluminum alloy interlayer on the linear velocity of 30, 50 and 100 mm / min, and rotational speeds of 800 and 1200 rpm. A threaded cylindrical tool was used for joining of the 5 mm sheets. The OM, SEM, microhardness and tensile tests were done. The results shows that in sample with an interlayer ...

Journal: :international journal of advanced design and manufacturing technology 0
saeid nader masoud kasiri- asgarani kamran amini morteza shamanian

in this study, friction stir spot welding (fssw) is applied to join the tial6v4 titanium alloy with 1.5 mm thickness and then the effect of rotational speed and tool dwell time on microstructure and mechanical properties is investigated. in this regard, the speed of the tool rotation was considered as 800, 1000, and 1200 rpm, as well as the tool dwell time was set at 7 and 12s. microstructural ...

2008
S. SULAIMAN R. YUNUS N. A. IBRAHIM F. REZAEI

In this paper the effect of hardener on mechanical properties of carbon reinforced phenolic resin composites is investigated. Carbon fibre is one of the most useful reinforcement materials in composites, its major use being the manufacture of components in the aerospace, automotive, and leisure industries. In this study, carbon fibres are hot pressed with phenolic resin with various percentages...

Journal: :Brazilian dental journal 2008
Eduardo Dalli'Magro Mário Alexandre Coelho Sinhoreti Américo Bortolazzo Correr Rafael Leonardo Xediek Consani Eliseu Augusto Sicoli Marcio José Mendoça Lourenço Correr-Sobrinho

This study evaluated the bond strength and Knoop hardness of Z250 composite resin, light activated with XL2500 curing unit, using different protocols: continuous mode - high intensity (CH) (700 mW/cm(2)) for 20 s; continuous mode - low intensity (CL) (150 mW/cm(2)) for 20 s; and pulse-delay with 150 mW/cm(2) for 2(P2), 3(P3), 5(P5), 10(P10) or 15 s (P15), with a 1-min delay, followed by 700 mW/...

Journal: :فصلنامه علمی پژوهشی مهندسی مکانیک جامدات واحد خمینی شهر 0
mohssen motaharinezhad islamic azad university, south tehran branch, young researchers and elite club, tehran, iran. saeed shahraki faculty of mechanical engineering, faculty of engineering, university of zabol

in this paper, the accumulative channel-die compression bounding (accb) method is investigated as a new method of severe plastic deformation to produce nano-crystalline bulk metals on the basis of pressing in a channel mold. aluminum as one of the most usable metal in industry is processed using this method. analyzing the processed samples show that after four passes of accb method, the ultimat...

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