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Fig. 1 Underground proppant Fig. 2 Finite element model Material Properties.
Material properties are shown in Table 1.
Table 1 Material Properties Elastic modulus /GPa Poisson's ratio Proppant 200 0.28 Tight Sandstone 50 0.3 Fig. 3 Load and Constraint Model Load and Mesh.
[8] Qi M H , Wu X X, Shi R Y, et, al .Effects of Pore Size on the Mechanical Properties of HGM [J].
Study on the factors affecting proppant embedment [J].

Many researchers have worked very hard to develop thick laminated composite materials that are safe and more cost-effective by carefully considering factors like the number of layers, the angle of the fibers, the distribution of the laminates, etc.
In [3], experimental analysis was used to study the vibrational properties of an edge-cracked composite plate.
The AFESPI approach was used to examine the vibrational properties of a composite plate with an edge crack.
A free vibration test on a standard plate was used to evaluate the dynamic properties of the plate composites.
The vibrational properties of the composite plates were measured using the pulsed excitation technique [11].

The influence factors are roughly divided into natural factors and mining technical factors.
The selection of roadway stability classification indexes should follow the principles as below: (1) Importance: when choosing indexes, the more important factors should be considered while the factors with less affect ignored, and the importance of each index must on the same level
However, the roadway has complex geological conditions, affected by so many factors that rock joints and fissures, hydrological factors cannot be taken into account with single physical and mechanical index, thus the surrounding rock stability could not be accurately reflected.
But in most kinds of the classification with comprehensive indexes method, the indexes focus on several main influence factors that not all the influence factors can be reflected, also, some factors decided by experience would affect the surrounding rock stability judgment.
The above analysis illustrates that many factors influence the surrounding rock stability, and each one represents a certain property, therefore, choosing main factors as the stability classification indexes is essential for evaluating the surrounding rock stability comprehensively.

Considering the structure characteristics of three coordinate measuring machine system, they are the important error sources that affect the precision that driving system, measuring system, computer system and other factors.
Dynamic errors and structural properties of the measuring machine, for example, mass distribution properties, rigidity of the components, the damping characteristics.
Assuming measuring machine in motion acceleration experienced, Load / BC Set Scale Factor = 384, ie y racks and ancillary component quality.
Mechanical Error in turn contains a quasi-static and dynamic errors[4].
[3] Dong Chensong, Guoxiong andMuyu Hai, China Mechanical Engineering, CHINA MECHANICAL ENGINEERING,1998,7(9)

Properties of AMCs can be tailored by varying the nature of constituents and their volume fraction.
The machined surface quality of composites is one of the most important concerns affecting the actual application of the composites [3].
Table 1 shows the chemical composition and properties of reinforcements of AMCs used for this purpose.
All of these factors deteriorate the surface roughness and influence the measured values.
Ye, The effect of machining on the surface properties of SiC/Al composites, Journal of Materials Processing Technology, 138 (2003) 464–467

The influence of preparation parameters on the properties of the coatings were investigated.
Titanium dioxide (TiO2), has specific performance in coatings, ceramics and sterilizing .Metal matrix composite coatings containing TiO2 particles exhibit interesting photocatalytical behavior accompanied by improved mechanical properties[4,5].
Reunions of nanoparticles often will lead to lose of its special physical and chemical properties.
Current density and surfactant type are the important factors affecting the properties of Ni-TiO2 nanocomposite coatings.
Study on the preparation and properties of Ni-nona-TiO2 electrode posited coating.

Thus, the 30%WC cermet was found to be the best sample concerning these two mechanical properties.
Chai et al. [97] investigated a series of influencing factors on cermets in their study, including the grain size of the starting raw powders.
A significant difference between these two samples was found in their mechanical properties.
Microstructure and room temperature mechanical properties Int.J.
Technol. 210, 122-128 [96] Klaasen H, Kübarsepp J, Roosaar T, Viljus M, Traksmaa R 2010 Adhesive wear performance of hardmetals and cermets Wear 268, 1122-1128 [97] Chai Y, Liu H, Huang C, Zou B, Liu H 2013 Study of influencing factors of mechanical properties of Ti(C,N)-based cermets Key Engineer.

Introduction As one kind of potential structure materials which can be used in high temperature, TiAl alloys have shown high specific strength, high specific stiffness and excellent mechanical properties in high temperatures [1].
And the sandwich structure made of TiAl alloys has shown greater carrying efficiency and high temperature mechanical properties, which have demonstrated broad applications in the manufacture of aircraft fuselage, thermal protection system and so on [2,3,4].
However, the superplastic deformability of the TiAl sheet is determined by several complex parameters, such as the friction between metal sheet and mold, the size and shape of mold, material properties and loading process.
All these factors can lead to nonuniform thinning or rupture of the sheet, which limits the application of sheet superplastic bulging.
Table 1 Structure parameters of the 1/4 model Length [mm] width [mm] height [mm] Thickness of sheet [mm] Radius of mold fillet [mm] Side wall rake [1] 30 26 13 1 3 0.154 Material properties.

Next, the factors affecting the machining accuracy are analyzed, and the main factors - the geometric errors are analyzed and integrated.
For its special geometric properties, it is widely used in the engineering of the wing, turbine impeller, blade class parts of the fluid machine, etc. [1].
But due to the linear motion in the starting of kinematic chain, this movement will affect changing the reference point of rest motion, and is not actually consistent with the axial direction of the tool.
Table 1 Mechanism parameters and error α γ R1 R2 R1 B1 B2 L 0 0 -40~110 mm 40 mm 32 mm 4μm 4μm 3μm 3μm α γ L B2 B1 R2 1.2″ 1.2″ 250~300 mm 1μm 108 mm 1μm 0 24 mm 3μm Fig.7 shows the effects that the spindle rotary feed influences mechanism output accuracy; from fig.8 to fig.10, output accuracy of axial part is given respectively as only one factor variable changing.is changed in the range of -180° ~180°; is changed in the range of -45° ~45°; the value of and is shown in table 1.
CHINA MECHANICAL ENGINEERING 22(2003), p. 1957~1961 [2] WANG Dianjun, Ye Peiqing and REN Fujun: Simulation of cutting space surfaces during five-axes WEDM.

Introduction A number of magnesium alloys have been shown to exhibit excellent mechanical properties, such as high specific strength at room temperature and superplasticity at elevated temperatures [1-4].
In case of application to a structural material, it is important to examine the mechanical properties on magnesium alloys whether satisfied with both reliability and safety or not.
In addition, since magnesium is hexagonal close-packed (HCP) structure, the basal texture affects the mechanical properties, strength and/or elongation-to-failure, at room temperature [10-15].
The fracture toughness in magnesium alloy is also affected to the texture distribution [16,17].
Therefore, the grain refinement is considered to be one of the improvement methods for mechanical properties [19,20].