Search results

As far as plenty of flow properties are changing rapidly, it is important to know both heat transfer and flow properties in a certain location and at a certain time.
Flow properties in the vicinity of a heated circular cylinder and heat loss depend considerably on the Reynolds number, turbulence level, and other factors.
The operating principle of a GHFS [3] is based on a transverse Seebeck effect: when heat flux transits through a plate with anisotropy of thermophysical and thermoelectrical properties, the thermo-electromotive force occurs.
Cylinder was turning about an axis by the force of electro-mechanical drive.
Combined calibration of the GHFS and galvanometer was made by affecting on the GHFS by known beforehand heat flux.

The effects of pressure on the wear resistance characteristics, mechanical properties and the microstructures of Al–Si piston alloys that have variable Magnesium (Mg) content are studied [12].
Tensile and impact tests were conducted to evaluate the influence of the interaction between grain refiner and modifier on the mechanical properties.
Variance ANOVA was used to estimate the optimum level and determine the magnitude of the influence of various factors. 
The evolution of microstructure can affect the hardness properties of metal alloys, and it can be due to the difference of phase morphology [18].
Conclusion In conclusion, the chemical compositions and mechanical properties of four different types of recycled aluminum are discussed.

The mechanical properties of solidified sludge block were evaluated by compressive strength, chemical oxygen demand (COD) and heavy metals concentration in the leachate from the solidified block were tested as well.
The hydration reaction Ca(OH)2, ettringite and calcium silicate hydrate and other hard water material, they cause the treated products have good mechanical properties [9].
The compressive strength of the solidified sludge block was measured to evaluate its mechanical properties by pressure testing machine (YES-3000 Digital Pressure Test Machine, Yiwu Appointments Test Instruments Inc.)
Conclusions a)The papermaking sludge after solidifying by using cement, fly ash, cinder and curing for formation had good physical and mechanical properties.
b) The addition of cement and cinder was beneficial to improvement of the mechanical properties of sludge solidified block, the compressive strength of cured block increased as the content of cement and cinder increased.

However, after a large number of ECAP passes (up to16), the corrosion resistance and anodic passivation property of UFG pure iron are less affected by annealing.
Although the superior mechanical properties of the ECAPed (ECAP processed) metals has been widely investigated and recognized, the reports on their corrosion resistance are still limited.
However, besides the grain size, the other factors such as grain size distribution, texture, and residual stresses in metals also have changes during processing, which significantly influence corrosion behavior.
As shown in Fig. 3a and 3b, all the samples exhibit obvious anodic passivation properties.
Therefore, the anodic passivation property of the pure iron samples after a high number of ECAP passes is not much affected by annealing.

Study on Bonding Properties of Copper and Aluminum in Nano Scale Using Molecular Dynamics Simulation Quang-Cherng Hsu1, a, Yen-Yu Cheng1,b and Bao-Hsin Liu 1,c 1Department of Mechanical Engineering, National Kaohsiung University of Applied Sciences 415 Chien-Kung Road, 80778 Kaohsiung City, Taiwan, R.O.C.
Introduction Though 7075 aluminum alloy (AA7075) possess good mechanical property, the thermal crack behavior will lead to bad welding strength.
Komanduri, etc. [1], analyzed single crystal material of aluminum, copper, Nickel with FCC and iron, chromium, tungsten with BCC, respectively, to explore the variation of mechanical properties during tensile test.
For example, properties of Ni and Pd, such as the lattice constant, elastic constants and sublimation energy are precisely derived by comparing to the experimental data.
In this study, bonding properties of three materials such as pure aluminum, pure copper and binary alloy (Al0.9Cu0.1) are analyzed.

Effects of Activator on the Properties of Brick Powder Foam Concrete Xiang Liu1,a,Yuanjun LI1,b 1School of Architectural and Civil Engineering, Inner Mongolia University of Science and Technology, Baotou 014000, China aiuxiangwd@126.com,b1990liyuanjun@163.com Keywords: Brick Powder Foam Concrete;Activation;Gypsum;Lime Abstract.The main chemical composition of waste brick is silicon dioxide,by means of chemical can stimulate its activity.In this experiment, gypsum, lime sodium hydroxide as activators,through the testing and research about the properties of compressive strength, dry density, water absorption of brick powder foam concrete,analyse the influence of three activators on the properties of foam concrete.The test results show that the:Mixing about 25% lime can guarantee the dry apparent density on the basis of compressive strength increases;Mixing 20% gypsum can make the strength and dry apparent density relatively stable;The incorporation of NaOH make the foam concrete
Compressive strength with reference to GB/T 11971—1997 Test method for mechanical property of aerated concrete.
Brick powder incorporation as cementitious material, cement and brick powder ratio of 70: 30,apparent density design of 600 kg/m3,ensure that the water-cement ratio constant during the test,Adding different dosage of activator, through the single factor experiment to analyze the effects of different species, different content of activator on the properties of foam concrete,the test process can be based on the fluidity of slurry micro adjustment of the dosage of superplasticizer.
When the gypsum mixed as activator, it can be seen from Fig.2,with the increase of the dosage of gypsum,the compressive strength of foamed concrete increased first and then decreased,the dry apparent density also show basically the same trend,but later increased.When the gypsum dosage at 30%, the 28 days compressive strength and dry apparent density of brick powder foam concrete were relatively stable,this shows that the incorporation of gypsum can stimulate the activity of brick powder, improve the mechanical properties of foam concrete.
[5] Yiping MA,Guoyou LI,Lixiang YANG,Le ZHANG.Effect of the Apparent density and Polypropylene fiber on Drying Shrinkage Cracking Properties of Foam Concrete[J].Journal of materials B:Research Part, 2012(3): 122-125.

These changes in the aspect ratio and redistribution of the intermetallics improved the mechanical properties such as hardness of the products.
Finally, the hardness of samples was measured with Brinell hardness test to study the mechanical properties.
The size, distribution and aspect ratio of iron and manganese-rich intermetallic compounds are important factors to determine the mechanical properties of the alloy [10].
Brinell hardness test has been carried out to study the mechanical properties of samples.
Thus, the mechanical properties of samples are considerably increased using cooling slope plus thixoforming.

In this study, treated palm oil fuel ash (POFA) was used as substitute material in producing porcelain ceramic with improved mechanical properties.
The proposed work would aid in resolving reducing environmental problems caused by palm oil waste, reducing the production cost of porcelain ceramic and increases the mechanical properties of porcelain body produced.
The mould pressure and bending strength of porcelain body produced with POFA substituting quartz content is measured to provide better understanding on the mechanical properties of the product.
These oxides serves as fluxing agents that strengthens the mechanical properties of the porcelain.
However, Carty and Senapati [15], claims that, mould pressure is not the only factor affecting the bending strength.

Craciunescu1b 1 "Politehnica" University of Timisoara, P-ta Victoriei nr. 2, 300007 Timisoara, Romania a email:ion.mitelea@mec.upt.ro, b email:craciunescucm@yahoo.com Keywords: friction welding, dissimilar materials, carburized steels, microstructure, properties Abstract Friction welding is one of the most reliable joining techniques for various materials due to a high reproducibility, lack of ecological treats and a relatively narrow thermomecanical affected zone.
Friction welding of dissimilar materials is a known procedure, but still subject of research activities in order to optimize the resulting properties [1-3].
The processing history of the parts on the friction welding is also considered in order to estimate the resulting properties [6].
The properties of the surface layer are known to be influenced by the carburization conditions such as the carbon potential, the temperature and the duration of the process as well as by the hardness gradient over the thickness.
Conclusions The main factor that is influencing the expulsion of the rich carbon layer from the joint plane of two carburized low alloyed steels is the friction path.

Experimental study on the fatigue properties of RC beam strengthened by prestressed CFL Yi Yang 1, a, Peiyan Huang1,b and Jun Deng1,c 1 College of Traffic & Communications, South China University of Technology, Guangzhou 510640, China a yiyang@scut.edu.cn; b pyhuang@scut.edu.cn; c dengjun@scut.edu.cn Keywords: prestress, Carbon Fiber Laminate (CFL), RC beam, fatigue property, experimental study Abstract: Bonding prestressed CFL to strengthen reinforced RC structures can improve the bending capability of structures and the working efficient of CFL.
Base on the fatigue experiments of 4 RC beams strengthened by prestressed CFL, the present paper analyzes the fatigue properties of prestressed CFL reinforced RC beams.
There are many factors which can affect the failure of the RC beams strengthened with CFL, such as the CFL thickness and modulus of elasticity, the concrete compressive strength and the stress level et al.
However, the reinforce of the beam will yield under the peak load of 32.5kN, and the fatigue properties are complex more. 40 80 120 160 200 27.5 30.0 32.5 Maximum load (kN) Fatigue lives (10 4 cycles) prestressed without prestress Fig. 2 Comparing curve of fatigue lives Crack growth High speed vidicon is used in the experiment to analyze the growth of the main crack.
Journal of Mechanical strength, 2004, 26(s): 025-027