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The use of HA coatings on titanium alloys leads to a structure that has good mechanical strength and good osteointegration properties at the surface and in the manufacturing of prosthetic devices.
The system HA/Ti is used to improve the surface properties of the device and to induce osteointegration process [8,9].
Another important factor to be considered is mechanical stresses.
Fig. 3d presents HA/Ti-6Al-4V cross-section which may give an overview of the possible impact of the morphology in the mechanical properties of the coatings and offer information directly related to their bond strength performance [43].
PS coating implant devices with HA the presented disadvantages some affecting the long-term stability and lifetime of implant.

Adhesion is a significant factor affecting performance of protective coating, which should tightly bond to the concrete substrate to provide long-term protection against corrosive environments.
As for QF-2 coating, it showed a lower decreased rate and kept a good adhesion after the co-action of two double factors exposure.
Study on the Properties of Polyaspartic Polyurea Coated Concrete under Salt Fog Exposure. 3rd international conference on concrete,2008.10,yantai, China
Study on dynamic mechanical behavior of polyaspartic polyurea.
Research on the morphology and properties of polyaspartic ester polyurea with different hard segment contents.

This phenomenon which is defined as elastic recovery during unloading is one of the most important factors to influence the quality of sheet metal forming.
Spring-back could be affected by numerous factors during the process, including sheet thickness, tooling geometry, process parameters, lubrication conditions and material properties.
This assumption means that the material properties do not vary in different directions or orientations.
The aforesaid punch displacement should be precisely controlled in order to prevent the punch from penetrating the workpiece and also affecting the spring-back calculations.
[4] Tekiner: An experimental study on the examination of springback of sheet metals with several thicknesses & properties in bending dies, J. of Mater.

A concept of closed electro-mechanical loop was chosen for design of the presented test stand due to its advantages described further.
The concept is based on the combination of electrical and mechanical power transfer in closed loop [1].
As it was described above, developed test stand is equipped with a unique system for the simulation of track irregularities [3] that dynamically loads the gearbox and considerably affects its fatigue properties.
It is expected that the testing stand should improve knowledge of behaviour and fatigue of gearbox as assembly, where minimum factors are neglected.
Dynybyl, Powertrain Metrology: Experimental Assistance of Research and Development in Mechanical Engineering, Czech Technical University in Prague, Prague, 2009.

Fig.1 Diagram of the lead frame Fig.2 Simplified bending model The factors which affect the numerical simulation of the bending process of copper alloy for lead frame are materials, mould clearance, rounded corners of mould, sheet thickness, blank holder force, friction and lubrication, grid division, calculation methods and the speed of stamping.
Therefore, the choice of different materials in the simulation process is a major factors.
Watanabe, Microstructure and mechanical properties of Cu-Ni-Si alloys, Materials Science and Engineering.
Tang, Study of rare earth elements on the physical and mechanical properties of a Cu-Fe-P alloy, Materials Science and Engineering.
Jia, Numerical Simulation Analysis on Bending Properties of Copper Alloy for Lead Frame, Hot Working Technology. 39 (2010) 75-78(in Chinese).

However, as is well known, welded joints can exhibit poor fatigue properties.
The heat of friction and plastic flow from the rotating tool produce significant microstructural changes, which lead to a local variation in the mechanical properties of the weld.
This paper determines fatigue properties of FSW of the Al5083-O alloy with FSW condition with tool rotation: 500 rpm-100 mm/min, 800 rpm-100 mm/min and 800 rpm-200 mm/min, including fatigue limit, fatigue characteristic values and fatigue crack growth rates.
The microstructure of the welded joint is formally divided into four zones: base material (a), heat affected zone (HAZ) (d), thermo-mechanically affected zone (TMEZ) (b) and stirred zone (SZ) (c) [1].
References [1] Caizhi Zhou, Xinqi Yang and Gouhong Luan: Fatigue properties of friction stir welds in Al 5083 alloy.

Thus metallic corrosion is a complex process, which is associated with the type of metal, also influenced by other factors, including soil conductivity.
For soil erosion, on the one hand, moisture makes the soil becoming electrolyte, providing the conditions for the formation of corrosive cell, on the other hand, the change of humidity significantly affects the physical and chemical properties of soil, affecting corrosive behavior of metals in soil.
Zhang [17] analyzed the properties of electrical corrosion and determined limits of the corrosion of earth's metallic components.
Effect of DC Stray Current on Corrosion Properties of the Grounding Grid Material with Different Moisture Content of the Soil [J].
Factors of Synthesized Electric Field Distribution in UHVDC Transmission Lines [J].

The aim of this study is to obtain mullite from the residue produced by kaolin industry, alumina and ball-clay and to characterize by physical and mechanical properties of the produced mullite.
The composition II present amount of mullite inferior compared to the others and this is due to the small content of silica from raw materials that is not enough to reach with residual alumina to form mullite and this affect the physical and mechanical properties of the specimens.
On the other hand, the compositions with greater amount of silica (I, III and IV) present high content of mullite and also better physical and mechanical properties, as can be seen in Table 9.
Figure 5 show the mechanical behavior of the specimens and the compositions I, III and IV present superior properties when compared with composition II.
According to Ebadzadeh [2] the factors that affect the mechanical resistance is the high porosity and the big size of the mullite grain.

Main factors affecting the mechanical properties of culvert structure is vertical earth pressure on culvert top, which largely instructs culvert structure design dimensions.
Earth pressure factor can reach 1.7 or 1.8 by using Marston theory.
Factor K increased with fill height on Marston theory.
Factor K increased with fill height to a certain value, then, almost no change on ZENG Guo-xi theory.
Factor K decreased with fill height on GU An-quan theory.

Table 1: Physicochemical and mechanical properties of WC-Co samples P8, P12 and P16.
This process also enhances the mechanical properties of the alumina.
Table 2: Physical and mechanical properties of alumina materials (CIRIMAT laboratory data [4]).
Effect of Material Properties.
In other hand, they also point out that material properties affect the level of energy of the acoustic emission signals.