Search results

Due to this, it becomes important the knowledge of the drying effects on the materials and its physical, chemical and mechanical properties, once that those characteristics significantly affect the heat and mass transfer phenomena.
In this sense, high temperature gradients and high water evaporation rates are undesirable factors, making it necessary the control of the process [3].
Depending on the thickness of the studied material and external factors of the ambient air, the models can be classified in models of thin layer and thick layer.
The physic-chemical properties of the air and product are shown in Table 3.
Table 3 - Thermophysical properties of air and clay (ceramic brick) used in the simulations.

In the long-term service period, environment, load and other factors, inevitably produces a variety of injuries, thereby reducing the carrying capacity, durability, and the life of bridges.
Practice shows that the finite element models even built by experienced engineers often have larger error and cannot accurately predict the mechanical properties of the actual structure.
Table 1 and Table 2 are the physical material properties used in FEA.
Material properties of cable Cable No.
Liu: Decomposing Modes of Long-span Cable-stayed Bridges Similar Model Structure Dynamics Properties Test.

Introduction Considering the mechanical properties of the amorphous materials, amorphous particles or fibers can be an excellent candidate for the reinforcing phase in the ductile metal matrix composites [1, 2, 3].
While outstanding mechanical properties of amorphous materials have been recognized in many studies, the limited thermal stability often provided a significant obstacle for practicing the amorphous phase as reinforcing materials during casting process [4-6].
For the evaluation of the mechanical property, uniaxial compression tests were conducted using an Instron-type machine (Hounsfield H25KT) at room temperature with a strain rate of 4.0 x 10 -3 s-1.
Another important factor for the successful fabrication of the composite is a stable interface between the reinforcing phase and the matrix.
Lyman, Metals Handbook 8th Ed.: Properties and Selection of Metals, ASM, Ohio (1961) pp. 957

Although the use of high volume fly ash beyond this range is studied [2-3], but their mechanical and durability properties are inferior to those containing low volume fly ash.
The reduction of CH is the indication of greater proportion of C-S-H gel that results in improving the mechanical properties of mortar.
Contribution of fly ash to the properties of mortar and concrete.
Properties of Concrete Containing Ultra-Fine Fly Ash.
Reduction of cement consumption by the aid of silica nano-particles (investigation on concrete properties).

Introduction The properties of polycrystalline materials are largely controlled by their structure and interfaces that they contain, particularly by grain boundaries (GBs).
It is the GB engineering which is designed to influence the properties of materials by affecting the GB character distribution [1].
The mechanical properties such as strength, ductility, creep, and corrosion resistance can be improved through a systematic modification of GB distribution.
The segregation factors vary between several units (for Au) to several ten thousands (for Bi or Se).
The segregation enthalpies of the investigated solutes are presented in Fig.5 as a function of selected physical properties.

The effect of different factors on the polymer concrete composite and material selection are also described.
Chen and Yang [3] studied the influence of polymer latex on the fresh and the hardened properties of modified concrete.
Yang et al [12] also studied the effect of the fiber/matrix interface on the properties of cementitous composite.
From the experiments, repair of damaged walls using FRP sheets served to restore the mechanical properties of damaged reinforced concrete walls.
OHAMA, Handbook of polymer-modified concrete and mortars properties and process technology, Noyes Publications, 1995

Study on the Viscosity and Dispersion Stability of AA-AMPS Copolymer on Nano Zinc Oxide Yue-Long LIU1,a,* and Jia LIU2,b 1School of Chemistry and Chemical Engineering, Jiangxi Science and Technology Normal University, Nanchang 330013, China; 2 Department of Mechanical and Electrical Engineering, Nanchang Institute of Technology, Nanchang330099, China alylgyx@163.com, b704604371@qq.com *Corresponding author Keywords: AA-AMPS copolymer; Radical polymerization; Viscosity; Dispersant.
These polyelectrolyte adsorption is highly dependent on the electrostatic interactions between the polyelectrolyte and the surface [3], hence, the surface chemistry of the solid phase and the solution properties of the polyelectrolyte are important parameters, regulated by the pH and the ionic strength.
Because the molecular structure of 2-acrylamido-2-methyl propane sulfonic acid (AMPS) [4] contains unsaturated double bonds, sulfonic acid groups and amide groups, which result in its beneficial properties, the unsaturated double bonds in AMPS make it easy to polymerize, the sulfonic acid groups can prevent the hydrophilic copolymer from reacting with ions in solution and also have a chelating effect, and the amide groups help AMPS to have a good hydrolytic and thermal stability.
H2O/g / ºC Initiator monomers (NH4)2S2O8/g NaHSO3/g ratio AA/g AMPS/g ratio 1 80 75 8 2.7 3:1 20 10 2:1 2 80 75 8 8 1:1 20 10 2:1 3 80 75 8 8 1:1 30 10 3:1 Many factors affect the polymerization process and properties of the final polymer AA-AMPS, such as the monomer mass ratio, reaction concentration, initiator dosage, pH, chain transfer agent, reaction time, stirring speed, the method of monomer addition and reaction temperature.

The electro discharge machining process is one of the most practical non-traditional machining method which is not affected by the hardness and physical properties of the workpiece.Many researchers haveinvestigated the machining of advanced materials and also useof some controllable parameters like gap current, pulse on time, pulse off time, gap voltage, and polarity.
Results showed that input current, pulse on time, duty cycle are significant factors for EWR.
Singh and Singh [11] have studied the effect of cryogenic treatment on the machining characteristics of titanium in electric discharge machining.It is observed that from literature review electrical and thermal properties of the materials can be improved by cryogenic treatment And better electrical properties are essential for workpiece and electrode materials in EDM.
Table 1 and 2 show the properties of electrolytic copper and Monel400 alloy respectively.
Table 1 Physical, mechanical and chemical properties of copper Copper 99.9 % Density 8.94 gm/cc Tensile strength, ultimate 220.632 MPa Tensile strength, yield 68.947 MPa Table 2 Physical, mechanical and chemical properties of Monel400 alloys Nickel 63 Copper 34 Density 8.8 gm/cc Tensile strength, ultimate 550MPa Tensile strength, yield 240MPa Melting point 1300°C Figure 1 Experimental setup Results and Discussions This section discusses the results of cryogenic treatment of Monel400 alloy along with electrical parameters and external magnetic strength on EDM performance measures namely MRR and TWR.

Cooling rates during quenching contribute to the development of final microstructure and hence mechanical properties.
It is therefore necessary to design and optimise heat treatment processes to ensure the best possible mechanical properties are obtained homogenously.
Date, Modeling of microstructure and mechanical properties of heat treated components by using Artificial Neural Network, Mater.
Talamantes-Silva, Use of controlled heat treatment to predict mechanical properties in steel components, Ironmak.
Hong, Effects of alloying elements on mechanical and fracture properties of base metals and simulated heat-affected zones of SA 508 steels, Metall.

To get single-layer of graphene, exfoliating fully intercalated graphite oxide into single- layer graphene oxide is one of the important factors.
Graphene have numerous potential applications [3-5], because of its unusual electron transport properties and other distinctive characteristics.
Hence, increasing the layer distance of graphite oxide is a elementary factor to prepare single-layer graphene.
(b) graphite oxide which were synthesized with ultrasound power of 180 W b2 and mechanical agitation b4 in the Low-temperature Reaction and its reduced products b1, b3 reduced from b2 and b4, respectively.
XRD patterns of graphite oxide with ultrasound power of 180 W (b2) and mechanical agitation (b4) in the Low-temperature Reaction and its corresponding reduced products b1, b3 was showed in Fig. 1 (b).