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However, owing to its properties of poor heat conduction, high chemical reactivity and low elastic modulus, titanium alloy easily reacts to tool materials at high temperature caused by narrow cutting zone, which makes it be considered as typical difficult-to-machine materials.
However, the mechanism and influencing factors of burr formation in micro-milling are different from those of traditional cutting theories as a result of size effect.
The influencing factors of burr formation have been studied extensively.
Filiz et al[5] found that burr formation are strongly affected by wear of micro-end milling cutters.
PMMA with good properties of enough brace stiffness, made it better to restrain the plastic deformation of workpiece.

Thickness is an important correlative factor for the relative translucency of IPS E.max LT framework materials.
Introduction IPS E.max system was superior to IPS Empress II system in mechanical properties and esthetics[1].
In this study contrast ratios of IPS E.max framework materials and chromatic values of IPS E.max blanks were measured with a calibrated spectrophotometer to study the correlative factors of relative translucency providing foundations for technical procedures.
The difference might be because of different thicknesses of specimens or better optical property of IPS e.max core materials.
Ceramics of high translucence allow more light to enter and scatter, which means that the underlying tooth affects the resultant color greatly.

Mold design for a composite core-pulling mechanism Yanfang Yin*, Huashun Hu School of Mechanical Engineering, Wuhan Polytechnic University, Wuhan，430030，China 1061942941@qq.com Keywords: ,Core-pulling, Design Analysis, Modeling, Composite Abstract.
The study is a one-dimensional analysis of secondary–ejector mechanism, based on a forward marching technique of solution for the simple structure and high safety and reliability. 3D numerical simulation of the different stages is considered: during processing, anisotropy of the stress state build up affects its mechanical or dimensional properties once the part is ejected.
Using the simulation analysis of mechanical system based on Pro/E, the mechanism can solve the problem that plastic parts are difficult to side core pulling in different directions by the use of bevel pillar.
This area, often neglected during mold design, is an important factor in the life of the mold and in part quality.

The activate processe of Ni-P electroless plating on the surface of SiC particles Jun Ying Hou1,a, Di Yang1 1Institute of Mechanical and Electrical Engineering, Surface Engineering Laboratory, Qingdao University of Science and Technology, Qingdao 266061, P.
Introduction SiC particles have many excellent performances, such as steady chemical property, high thermal conductivity, low thermal expansion coefficient, good wear resistance and high hardness.
These products change the micro-structure of metal matrix, and cause the unfavorable effect on the interface bonding and the material mechanical properties[3].
Experiments were carried out according to the factors affecting SiC particles activation effect, such as stirring methods (intermittent stirring and continuous stirring), activation methods and the plating temperature (between 50°C and 90°C, taking experiment temperature interval 5°C).

Some mechanical properties (microhardness and fracture toughness) were also evaluated.
The use of Y2O3 and AlN as sintering aids gave excellent results for physical and mechanical properties in Si3N4-SiC(w) composites [19].
However, these phases can reduce the high temperature mechanical properties and can also affect the oxidation behavior of ceramics composites [27].
This behavior can produce mechanical properties anisotropy, mainly the fracture toughness [30-31].
Wachtman: Mechanical Properties of Ceramics, John Wiley Sons Inc, New York, 1996

Introduction Due to their favourable mechanical properties in combination with low specific weight aluminium alloys, cold-formed and precipitation-hardened, are of great interest in the automotive and aircraft industries.
By this local heating the microstructure may be changed strongly, which results in inhomogeneous recrystallisation processes and at least in a strong loss of the initial mechanical properties.
The material properties vary locally.
The term “metallurgical notch” refers to the abrupt changing of mechanical properties in the environment of the weld seam as a result of the applied heat treatment [1; 2].
In practical use, this distribution of mechanical properties can create complex strain and stress conditions.

Introduction As everyone knows, cement soil is soil body mixing natural soft soil with grout (or cement powder), with the help of mechanical stirring or jet punching.
However, because of many factors, such as varieties of cement, strength class, mixing ratio, age as well as the surrounding environment, affecting the performance of cement soil, it is very necessary for many researches to carry out the experiments on the physic and mechanic performance of cement soil.
Sili Chen and Baokuan Ning etc.[1-3] have had tests of cement soil in macro and micro fracture process in a complex environment, analyzing the mechanical effects of cement soil in different environments.
Jun Wang, Xiaolei Ji and Renwang Liang[4-6] have carried out several experimental study of the mechanical properties of the cement soil.
The mixing ratio of cement soil The tested cement soil of undisturbed soil taken from silty clay in a road based in Shenyang City, which is soft plastic state in the natural state, and its main physical properties of the indicators are shown in Table 1.

Table 2 Summary of the effect of Co2+ incorporation on the angiogenic properties of implant.
Improving the Other Properties of Implants.
The incorporation of Co2+ could also affect the tribological properties of implants.
Yunfei Zheng et al [10] studied the mechanical properties of co-doped TCP.
In addition, cobalt doping increases the implant's mechanical properties, such as modulus, bending strength and fracture toughness, and other properties, such as martensite transformation and MCE, performance to a certain extent.

The in vivo resorption of bioceramics is governed by two factors: Factors affected by dissolution of the material into the body fluids and depends on the final components of implant such as surface area, crystallinity, phase composition and so on and factors that are induced by body environment such as cellular activity of osteoclasts, macrophages, and white cells around the implant [4].
Regarding to these factors, several efforts have been made to improve the resorption rate of HA implants by increasing its surface area and declining its crystallinity.
Some of the above mentioned fabrication techniques are not sufficiently suitable to control scaffold structure to modulate mechanical properties.
The structural analysis, mechanical strength and cellular biocompatibility of the produced scaffolds were announced.
Kozłowska, Properties and modification of porous 3-D collagen/hydroxyapatite composites, Int.

The influence of thickness of composite laminates on the temperature distribution was investigated, and how the size of laminates affects the inside temperature was also discussed.
Physical and thermal properties of the glass/epoxy laminate were calculated using the simple rule of mixture and Springer-Tsai model from individual material properties shown in Table 2.
Individual material properties [8] ρmatrix [kg/m 3] 1210 Kmatrix [W/m⋅K] 0.24 cmatrix [J/kg⋅K] 1740 ρfiber [kg/m 3] 2540 Kfiber [W/m⋅K] 1.04 cfiber [J/kg⋅K] 920 ρaluminum [kg/m 3] 2720 Kaluminum [W/m⋅K] 220 caluminum [J/kg⋅K] 903 ρrelease film [kg/m 3] 2200 Krelease film [W/m⋅K] 0.4 crelease film [J/kg⋅K] 1050 ρbagging film [kg/m 3] 1140 Kbagging film [W/m⋅K] 0.24 cbagging film [J/kg⋅K] 1670 Results and Discussion The predicted temperature profiles are compared with the available experimental results of 20 mm thick glass/epoxy [6].
As shown in Fig. 5(a), the thickness of laminate has a great influence on the temperature overshoot at the mid-point of center section, while it is little affected by the size of laminate.
The temperature overshoot at center of laminate is significantly affected by the thickness of laminate while the size of laminate has little effect on it.