Search results

In the Northeast cold region, the concrete structure with direct contact or indirect contact with seawater or similar things such as salt lakes, saline soils, etc. will generally be affected by double factors of freeze-thaw cycle and salinity corrosion pairs.
Freeze-thaw cycle, and saline media penetration as two factors to affect each other mutually and intensified will induce reinforcement corrosion and seriously affect the performance of concrete structure in service time and lead to its degradation performance.
However, most of the existing studies are on the changes of durability in the materials of steels or concrete themselves by a number of factors, which the study on anti-corrosion and frost resistance of concrete structure is still at the exploratory stage[1], especially the study considering the effects of steel corrosion and concrete freeze-thaw at the same time to the durability of reinforced concrete structure is almost in blank.
In this paper, different tests have been made on different degrees of freeze-thaw cycle and reinforcement corrosion in concrete structure to find out the affecting law on mechanical properties of concrete structure, and the test data have been analyzed and sorted immediately.
On other mechanical properties of concrete structures under freeze-thaw environment, some further studies are needed later.

As a single-atomic-layer material, graphene may form strong interface bonding with metal and enhance the properties of the composite due to the large surface area and extraordinary mechanical properties [3].
Subsequently, the compression experiments on micro-pillars done by Feng et al. [7] showed that the arrangement of graphene was a critical factor affecting the strength of composite, so the importance of structural design is emphasized.
In this study, the mechanical properties of Gr/Al nano-laminated composite under tensile loading are investigated using the MD simulation.
Subsequently, the worse mechanical properties along out-plane direction cased by the stacked graphene structure is studied.
Wang, Interface mechanical properties of graphene reinforced copper nanocomposites, Mater Res Express. 4 (2017) 115020

Secondly, the analysis of mechanical properties of AZ31 magnesium alloy sheets at high temperature The relation between the temperature and tensile strength, the yield strength and elongation of AZ31 magnesium alloy sheets after fracture are shown as Fig.3.
The deforming temperature is one of the main factors of plastic deformation capacity.
The properties of various phases are different when AZ31 magnesium alloy is deformed.
The depth of the dimples is mainly affected by the deforming capability.
On the other hand, the grains grow abnormally, prone to oxidation corrosion, and the mechanical properties and surface quality decline when drawing at the temperature more than 400˚C.

When a product contact parts variety and more complex, if it is unreasonable to establish the knowledge base will affect the speed of retrieval, and even affect the final design.
Case description Examples of mechanical products.
In the mechanical production process requires a lot of equipment, for example ,lathe, its development has gone through several centuries before the formation of today's CNC lathes, CNC lathe also inherited lathe ‘s characteristics, the most important feature is the ability to process rotary parts, where CNC machines and lathes can be used as an example, and CNC lathes as a child inherits the characteristics of conventional lathe, CNC lathe specific examples can be divided into many sub-class instances, each case its own characteristic properties, these properties have similar features but also has inherited, so it is necessary to distinguish between these attributes, and characteristics make a good link.
Each attribute is owned by a specific example, as in Example geometry, shape, symmetry, will be transferred and the like, characterized in that each set of these properties, if the feature attribute indicated by F, p represents an attribute.
We look at an lathe example to influence characteristic attributes of lathe spindle precision which: 1manufacturing precision spindle itself; 2 bearing bore accuracy; 3 bearing the impact; 4 adjusting nut effect; 5 bushing impact; 6 precision of assembly; 7 spindle temperature effects; Select one of the factors continuing downward , we chose 3 bearings precision ,bearings have many attributes, there are precision, bearings to withstand the load, speed and so on.

Austenite grain size is an important microstructure parameter when processing steels as it provides the initial condition for the austenite decomposition that determines the final microstructure and thus properties of the steel.
The laser-ultrasonic system is attached to a Gleeble 3500 thermo-mechanical simulator.
As indicated in Fig. 6, introducing a correction factor of 1.5 to the C-Mn steel calibration mitigates this problem.
For example, grain growth is markedly affected when precipitates dissolve.
The increased amount of solutes in the matrix affects the elastic constants and this may be recorded with the velocity data.

Lim 2, c,＊ 1 Graduate School, Sungkyunkwan University, Korea 2 School of Mechanical Engineering, Sungkyunkwan University, Korea a baesiyon@skku.edu, bkultra@skku.edu, c bslim@skku.edu Keywords: High temperature; HAZ (Heat Affected Zone); P122; Fatigue; Weldment.
Consequently, in order to improve the thermal efficiency of power plant, there has been a strong drive to develop more advanced heat resistant steels with excellent creep, high temperature fatigue and thermal fatigue resistant properties as well as superior oxidation and corrosion resistant properties.
To improve the thermal efficiency of a power plant, heat resistant steels with excellent creep properties as well as superior oxidation and corrosion resistance properties have been developed (4).
The results are represented by fatigue crack growth rate (da/dN) vs. stress intensity factor range (∆K) curves in Fig. 3.
The results are presented by fatigue crack growth rate (da/dN) vs. stress intensity factor range (∆K) curves in Fig. 4.

Therefore, the shape and size of burr formed in machining are important factors to improve the surface quality of the workpiece and the machining efficiency.
As is obvious in the figure, a semicircle heat affected zone (HAZ) is observed, where the martensitic layer is formed in the ferrite-pearlite mother phase.
One of factors of burr formability is mechanical properties of the workpiece.
This is the reason why the burr formed in milling is able to be prevented by partially alteration of mechanical properties of the workpiece by laser hardening.
In case of higher laser density, burr is not observed so that the chipping (negative burr) is caused at the completely martensitic layer in the heat affected zone.

Study of Slurry Erosive Wear Behavior of Titania-30 Wt% Inconel-718 Plasma Sprayed Mild Steel using Taguchi Technique C S Ramesh1, a, R Suresh Kumar2,b*, G Dilip Maruthi2,c, Rashmi R2,d 1Department of Mechanical Engineering, PESIT, Bengaluru, India 2Department of Mechanical Engineering, BMSCE, Bengaluru, India a csr_gce@yahoo.com, b sureshkumar.rupanagudi@gmail.com, c gdm.mech@bmsce.ac.in, d rashmir.mech@bmsce.ac.in * Corresponding Author Keywords: Plasma spray, Slurry erosive wear, Surface coating, Mild steel, Titania, Inconel-718 Abstract: Surface coating is sharing the responsibility between coating and substrate, which enhances the surface properties such as strength, hot hardness and toughness, wear resistance, antifriction and chemical inertness.
Gaurav Gupta et al. [3] revealed that premixing of Al2O3 with glass microspheres improves the coating adhesion strength without significantly affecting the erosion wear performance of the coatings and among all the control factors impact velocity is the most significant factor affecting the wear rate of these coatings.
The Taguchi approach accommodates the effect of several factors on the target value.
A factor is significant if the P static of the factor is less than 0.05.
In this light, the particle size is the most influential factor and significant factor for uncoated and 200 µm coated specimen while speed is the most influential factor and significant factor for 100 µm coated specimen.

Many parameters, such as oil droplet diameter affect the separation performance of the hydrocyclone.
The physical and chemical properties of produced water vary considerably depending on the geographic location of the field, the conditions of the geological formation, the type of hydrocarbon product being produced and the upstream process.
The produced water treatment system is based on a mechanical or a chemical process.
In the present study, oil droplet size was assumed equal to 0.1; 1.0 and 10.0 mm and the physical properties of the phases (water and heavy oil) used in the simulations are illustrated in the Table 1.
Table 1 Physical properties of water and heavy oil Properties Value Source  (heavy oil) 963.6 (kg/m 3) Paladios (2007) µ (heavy oil) 17.6 (Pa.s) Paladios (2007)  (water) 997.0 (kg/m 3) Incropera e DeWitt (2002) µ (water) 0.0008899 (Pa.s) Incropera e DeWitt (2002) wall roughness. 0.0045 (mm) - Results and Discussion The streamlines of water and heavy oil are shown in Fig. 2.

Experimental materials in this paper are taken from songyue temple and fawang temple which are both in henan province, X ray fluorescence analysis method is adopted to analysis the chemical ingredients of the historical bricks come from two temples respectively; strength of the bricks come from two temples are compared also; then a model of porous bodies connected parallel is established to reflect the pore distribution of material, the qualitative relationship between strength of material and porosity/pore distribution is derived; mercury intrusion method is used at last to get the porosity and pore microproperties of the historical bricks come from two temples, results show that porosity and microproperties of pores are important factors that affect the characteristics of historical brick material. 1 Introduction Historical brick material is a kind of porous artificial material that used in historical buildings widely, the main chemical ingredients of this kind of material are SiO2
Porosity and pores distribution are very important microproperties of historical bri- ck material, they are also key factors that affect the macrocharacteristics of historical brick m- aterial, like weather-resistant and strength etc, so it’s necessary to study the porosity and pores distribution of material.
(4) P——pressure(psia); ——surface tension of mercury(485dy/cm); r——radius of pore(nm); ——contact angle between mercury and experimental material() [8,9] A number of factors affect the mercury intrusion results, most important among them are the meth- od of sampling, number of sample, sample conditioning, rate of pressure of application, maximum i- ntrusion pressure applied, values of contact angle and surface tension of mercury used in Washbur- n’s equation etc [4].
[6] R.Kumar,B.Bhattacharjee, Study on some factors affecting the results in the use of MIP method in concrete research, Cem.
Melin, M.; Hartmann, Effect of micro- and macroporosity of bone substitutes on their mechanical properties and cellular responseJournal of Materials Science: Materials in Medicine, v 14, n 12, p 1089-97, Dec. 2003