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Because of its large size, weight and other factors of the components, resulting in the installation process, some tools such as a bracket and screw with the light bar and other parts of natural distortion, so the gravity beam deformation is moving gantry CNC milling machine an important source of geometric error one[1].
Then the beam weight and gravity headstock torque M produced by the joint action makes the beams deformed, the deformation of the beam will directly affect the on-site precision, so the beams as the main object of study, Beam by the force diagram shown in Figure 2.
In this paper, the two main factors is attentive in the meshing : first, meshing be divided by the software automatically and combination with human involvement to complete, which will improve the classification efficiency.
Beam material properties: material: cast iron; modulus: 110Gpa; Poisson's ratio: 0.28; Temperature: 20 ° C; density: 7.250 × 103kg/m3.
[4] LUO Chuan Li, LI Duan Neng, Mechanical and Electrical Engineering, 2006 (35)45~47 [5] ZHANG Bai Peng,ZHANG Nian Song, Tsinghua University (Natural Science), 2006 (2)191~193

The modified material surpassed the initial aluminum in wear resistance by a factor of 2.4 and in microhardness by a factor larger than 4.
Eliezer, Synthesis, properties and applications of titanium aluminides, J.
Teer, Structure and mechanical properties of co-deposited TiAl thin films, Thin Solid Films 420-421 (2002) 386-391
Chen, Tribological properties of titanium aluminides coatings produced on pure Ti by laser surface alloying, Surf.
Tolkachev, Complex Electronion Plasma Treatment of Titanium: Methods, Structure, Properties, High Temperature Material Processes 21(1) (2017) 53–64, doi: 10.1615/hightempmatproc.2017021265 [9] V.N.

Study on Durability of C100 Concrete in Shenyang Royal WAN XIN Hotel Da-Li Zhang1,a, Yuan Wang 1,b , Cui-Hong Chen1 1 Liaoning Province Building Science Research Institute, Shenyang 110005, liaoning,China a mail: zdl_3000@sina.com; bmail: lnwy@yahoo.com.cn Keywords: super-high strength concrete; durability; tests Abstract: Durability of C100 concrete in Shenyang WAN XIN Hotel engineering including long-term mechanical properties, dynamic modulus of elasticity, and chloride ion resistance was tested and analyzed.
Change of dynamic modulus of elasticity Determination of dynamic modulus of elasticity is a possible examination method in durability tests, and mainly uses to examine the internal structure change of concrete under each kind of factors.
And if it drops, there are some damages, and then the durability of long-term concrete will receive affects.
The research indicates C100 concrete can guarantee the stability of the long-term mechanical performance sufficiently and not deteriorate although its water-cement ratio is very low. 2.

Through the methods of combining theoretical research and experimental verification,under the premise that meet tube sheet properties and strength of materials and related technical requirements,which reduce test cost and time and shorten manufacturing cycle and the methods have guiding significance for establishment of welding procedure.
Thermo-mechanical coupling computation Thermal physical properties of material.The material used in welding simulation is 20MnMo that is provided by enterprise,of which thermal physical properties include melting point,density,elastic modulus,poisson's ratio,specific heat,linear expansion coefficient,heat conduction coefficient and convection coefficient etc in different temperatures.As shown in table 2.
In the welding process, welding material is gradually filled in weld joint, then the weld joint material does not exist at the start of welding, but generation with welding processes.It is necessary to use element of life and death technique to truly simulate the process.Element life or death means if add or delete material into the model, the relevant element of the model will birth or death.The death element is not deleted from the model, but the element stiffness matrix is multiplied by a small factor, thus death element’s load, mass, damping and other similar properties will become zero.In welding simulation,weld joint element is killed first and will be reactivated gradually as the welding proceeding,which will deliver energy and realize thermo-mechanical coupling process.
Setting Boundary conditions.Surfacing welding thermo-mechanical coupling boundary conditions include boundary conditions of temperature field analysis and stress and strain.
Loading moving heat source.The accuracy of welding simulation affects the distribution of temperature and stress field directly, so in order to load heat flux into birth element correctly,which must combine heat source movement with life and death of weld joint element closely to ensure the completeness and accuracy of thermo-mechanical coupling process[6].The article uses Fortran language to program the path of heat source movement and heat source equation by heat flow density formulation of Gaussian heat source, part programs shown as followed.

Miscibility affects the mechanical property, surface morphologies, permeability and degradation of the polymer latex blend.
This is owing to its excellent properties like oil resistance and low gas.
The miscibility and compatibility of the blend is observed via morphologies properties characterisation.
This solubility is suggested to be one of the factors which contribute to better miscibility between two polymer components.
Perena, Effect of crosslinking of the mechanical and thermal properties of PVA, Polymer. 41 (26) (2000) 9262-9272

The family of composite materials with fibers which appeared in the 1940s makes profitable the high mechanical properties of certain fibers.
The quality of this connection influences considerably the mechanical properties of the obtained material.
Through the reinforcement of structures by composite materials, the main goal is to improve the mechanical properties of concrete.
All the mechanical properties are introduced according to the experimental data and the composite grid is taken into account in the behavior model.
Properties Metallic grid with rhombus cells (GMR) Polypropylene Grid (GPP) Metallic grid with hexagonal cells (GMH) Masse [g/m 2] 900 500 250 Number of meshes [/m 2] 1952 936 1269 Diameter [mm] 1 3 0.55 Table 3: Mechanical properties of the grids.

Then friction material properties are very important on the output characteristics of TWUSM.
Properties of friction material directly affect motor’s conversion efficiency, service life, running noise, and drive stability, etc.
These properties are the basic requirements for friction material which will be applied to TWUSM.
This is a problem of multi-factor formula design.
Proper content ranges of modified materials were determined to improve the mechanical properties and maintain the tribological properties of EK matrix.

In this case, all the processes taking place in the energy supply for welding, the power source, the current flow through the connection, heat expansion on heating or cooling, structural, phasic and chemical transformations, fusion, weld crystallization, changing of material properties in the weld and the heat affected zone , impurities diffusion, as well as distortions and stresses .
A part of these processes, occurring when welding and allied technologies (heating and cooling, corrosive environments, deformations), can be present at operating loads, i.e., act on fabricated construction, affecting its efficiency.
In the following it is necessary to know thermophysical properties of the alloy under examination to define the physical conditions.
All necessary properties are given in the form of piecewise linear functions, for example, the heat capacity function in terms of temperature, the density function in terms of temperature
The results of simulation will depend on the correct input of material properties in the form of various dependencies.

Vibrational properties knowledge helps in design, control and reduce undesirable vibration, but direct measurement is difficult and contain significant errors.
The aim of this paper is the presentation of an efficient method using acoustics that can obtain vibrational properties by measuring other quantities, like fluid pressure dynamics somewhere near the structure.
In Inverse Numerical Acoustics properties of vibrating source i.e. surface vibration of source, is reconstructed by measuring sound pressure of some points of fluid field near the vibrating source.
One major parameter, which affects the history identification, is error in data measurements.
Its properties are material density: 7800 kg/m3, Young’s modulus: 200 Gpa, Poisson ratio: 0.3, thickness: 0.01 m, air density: 1 kg/m3, and wave velocity in air: 334 m/sec.

Steady Heat Transfer Analysis of Leaf Spring Rotary Engine Dongjie Wang1, a, Zhengxing Zuo2, b 1School of Mechanical Engineering, Beijing Institute of Technology, Beijing, China, 100081 2School of Mechanical Engineering, Beijing Institute of Technology, Beijing, China, 100081 awangdongjie@bit.edu.cn, bzxzuo@bit.edu.cn Keywords: leaf spring; rotary engine; heat transfer; thermodynamics; performance Abstract.
Fig. 9 p-V diagram of different ignition position Fig. 10 Output power of different ignition position Summary Heat transfer is one of the important factors that affect the performance of the small-scale leaf spring rotary engine.
The ratio of surface area to the volume of the engine increases when the engine is scaled down and the heat loss will affect the combustion reaction.
The ignition position will also affect the performance of the engine.
So we can consider the properties analyzed and take necessary measures for the realization of the design objective of the leaf spring rotary engine.