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In two end face of piezoelectric ceramic coated electrodes , compressive stress in the thickness direction, the piezoelectric equation is In this equation: D is the component of the electric displacement thickness direction, numerical value is equal to the electrode on the polarization charge density, (Q is charge of production of ceramic chip, S is the size).is the normal stress of the thickness direction ,(F is applying force on ceramic chip );is the electric field intensity; is the piezoelectric constant;is the dielectric properties coefficient of piezoelectric ceramic.
After the reduction available: (3) According to the equation(2) with equation(3): The voltage value Control system The most important technology of assembly machine is to provide a stable torque for the piezoelectric transducer nut so that it can complete the installation, because the stepping motor has the characteristics which working status is not easily affected by various interference factors, angular displacement is proportional to the input pulse number strictly, motor running without accumulated error after a week, fast dynamic response, easy to stop[4],the system selects the stepper motor.
As shown in Fig. 6 ,with the increase of the voltage ,impedance is on the decline, when the voltage is 3.5 V and 4.5 V impedance, because of the result of material factors,the impedance is very high.
Mechanical design foundation [M].
Mechanical design course design manual [M].

Empirical equation of thermal conductivity is obtained and conductivity factor is ensured by test data.
Zhao Jian conducted an experimental study of hydro-thermal properties of rock fractures by heating the rock and forcing the water circulation through the rock fractures[5].
In this paper, by testing thermal conductivity, conductivity factor is ensured for fracture rock.
Thermal Conductivity Test This test’s purpose is determining conductivity factor of rock.
(3) The water in the fracture is laminar, and physical properties is constant.

Mechanical Properties Figures 3 and 4 are respectively the curves of the hardness and strength of sintered samples with different Cr content.
When Cr.wt% = 2 or 3, with the content of Cr it affinity O and C increase, in the materials the Cr compounds of O or C to increase, with poor binding between matrix, affecting the pressing and sintering properties.
Conjunction with Figure 1, Figure 3 and Figure 4, we can find, in the friction materials when Cr.wt% = 1.5 (Cr is joined in materials by ferrochrome), the materials shows better physical properties, mechanical properties and friction and wear properties.
(3) Sintering temperature and Cr content are major factors to impact on overall performance of materials.
(4) In the friction materials of copper matrix powder metallurgy, when adding Cr.wt% = 1.5, it has better physical properties, mechanical properties and friction and wear properties.

The simulation results show that the effect of these two factors on fractures initiation, propagation and rockmass stability under the hydraulic fracturing could be remarkable.
Introduction Natural fracture is the main store and flow place of groundwater, the connectivity and distribution of nature fracture has a significant effect on the mechanical properties and permeability characteristics of rockmass.
Figure 1 is Weibull distribution for mechanical properties of materials with homogeneity index m value 1~5.
Fig.1 Weibull distribution for mechanical properties of materials with different homogeneity indexes m Numerical experiments Model set In this section, numerical model is divided into two groups, simulated fracturing process of rockmass which with different fracture angles and different fracture length.
Influence of heterogeneity of mechanical properties on hydraulic fracturing in permeable rocks[J].

The effect of CNTs on the mechanical properties of Al was investigated and a significant enhancement in tensile strength was obtained compared with the pure matrix.
The microstructure and mechanical properties of the composites were characterized.
The physical and mechanical properties of the as-rolled Al/Al-CNT composites are given in Table 1.
Table 1 Physical and mechanical properties of Al/Al–CNT composites.
By selecting a proper combination of the above affecting factors, the expected strengthening mechanisms could be achieved.

Introduction Values and vertical gradients of shear wave velocity (Vs) are important physical and mechanical properties of soils.
In addition, several geological investigations have recently used correlations between geological parameters and Vs in predicting the foundation properties [4].
The affecting factors mainly include the physical and mechanical properties of foundation soils, such as standard penetration test (SPT) number N, side friction fs of CPT, cone tip resistance qc of CPT, depth z, void ratio e, compression modulus Es, water content w, density ρ, specific gravity of soil grain Gs and type of soils T.
The affecting factors are defined as the input samples and the corresponding Vs as output samples.
Because the GRNN estimation model considering the comprehensive factors, the predicted results show good agreement with the actual values.

Mazur, Influence of Low Temperature on Concrete Properties, IOP Conf.
Bashandy, Influence of Curing Temperatures on the Properties of Fibrous Concrete, J.
Jian, Some factors affecting early compressive strength of steam-curing concrete with ultrafine fly ash, Cement concrete Res. 31(10) (2001) 1455-1458
Izotov, Study of the influence of electrolytes on the physical and mechanical properties of heavy concrete, Bulletin of the Kazan Technological University, 17(14) (2014) 140-143
Ruello, Effect of hydrophobic admixture and recycled aggregate on physical-mechanical properties and durability aspects of no-fines concrete, Construct.

The best mechanical properties were also identified as 394 MPa ultimate strength, and 363 MPa yield strength, when 200 RPW cycles were used.
Properties of composites are affected by the type of reinforcement, the choice of matrix alloy and the manufacturing techniques.
Therefore, taking the above factors, the Mg2Si/Mg-5Zn-2.5Er composite materials reached the optimum properties when the number of RPW cycle was 200.
(3) The mechanical properties of Mg2Si/Mg-5Zn-2.5Er composite materials were significantly improved during the RPW .
When 200 RPW cycles were used, the best mechanical properties were achieved as 394 MPa ultimate strength , and 363 MPa yield strength.

Investigation of Tribological Properties of AlMg4,5Mn0,7 in a Warm Forming Process Using the Barrel Compression Test Benedikt Müller1,a*, Stephan F.
Forming is mostly characterized by an intense mechanical contact between tool and workpiece caused by high loads.
Friction affects surface quality, the final shape of the workpiece and tool wear.
Friction-affecting parameters, like cylinder size, forming degree and lubrication, were varied in the experiments and are listed in Table 1.
Müller: Evaluation of tribological properties of AlMg4.5Mn0.7 in massive microforming using the barrel compression test.

Poor in the orthogonal experiment is often used to measure the size of R factors affect the size of the test targets.
Terrible big factor, that it changes the level of the impact indicators are usually important indicator; small and poor factors are important factors.
We Can draw from the results of the analysis in Table 1, the compressive strength of the factors affecting the order as follows: water-cement ratio, fly ash, ceramic dosage, silica fume, the amount of cement and sand ratio, the optimal mix combination A1C1E1D2B2F1.
However, the mechanical properties of carbon fibers with different contents of concrete are also different.
Different fly ash high strength properties and constitutive relation of experimental study on mechanical mixing aggregates [J].