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In finite element analysis, the model processing, load and boundary conditions, the unit mesh is the key point, which directly affects the accuracy of the results.
Second, the element type is selected and the material properties are defined.
Setting element properties are prepared for meshing.
It is the characteristics of display to control nodes and elements, such as label, shrink, elements, material properties and the default designation of loading conditions.
The precision and scale of calculating are affected by how much is meshes.

However, it is difficult to apply the foregoing laser plastic welding technology for this joining in terms of the bigger difference in physical properties between the joining materials.
Such joining is generally performed using adhesive bonds or mechanical tools, such as bolts and rivets.
For the laser joining between metals and nonpolar plastic, we cloud develop a new insert sheet in which the difference in physical properties between the joining materials has been reduced [4,5].
the adhesive property.
Therefore, a hydrogen bond is a controlling factor in the joining of aluminum and the insert materials compared to the acid-base interaction.

High speed milling of SiC particle reinforced aluminum-based MMC with coated carbide inserts Sun Fanghong 1.a , Wu Zhenyu 1,b, Zhong jingwen 1,c , and Chen Ming 1,d 1 School of Mechanical Engineering, Shanghai Jiao Tong University, Shanghai, China, a sunfanghong@sjtu.edu.cn,b wzy124@sjtu.edu.cn,c happyzjw@sjtu.edu.cn, d mchen@sjtu.edu.cn Keywords: SiC particle reinforced aluminum-based MMC, High-speed milling, Cutting forces, Cutting temperature, Surface roughness Abstract.
Metal matrix composites (MMC) have many advanced mechanical properties such as high wear resistance, low weight, high strength and stiffness, lower expansion coefficient and high thermal conductivity, which are widely used in the automotive, railway and aerospace industries.
Owing to such better characteristics, automotive, aerospace and train companies hope to replace steel and cast iron in mechanical components with lighter aluminum-based MMCs.
This factor prevents more manufacturers from embracing MMC technology.
The cutting speed affects the cutting force in three main factors:(1) The addition of SiC particles will hamper the rapid ductility of the aluminum matrix alloy in high speed milling process; (2) High speed cutting leads to an obvious increasing of the number of SiC particles which can be shifted, cut through, and pulled out; (3) High speed interrupted milling leads to the high abrasion rate between high hardness SiC particles and cutting tool edges.

Mechanical and Structural Engineering (DIMS), University of Trento, Trento, Italy 3 Ma.de.
Economical reasons could have affected the mentioned technical choices, as well as that of using second-hand timbers.
Local mechanical damages were found, where decay already reduced the resistance of the material.
Mechanical material properties were assumed by visual strength grading (EN 338:2004).
The truss failure was caused by a combination of these factors.

Self-nanocrystallization surface of pipeline steel X80 was obtained by surface mechanical attrition treatment (SMAT).
Due to low tempering temperature of pipeline steel, which is lower than 560℃, the conventional aluminizing, processed at above 900℃ for several to dozens hours, will dramatically deteriorate its microstructure and mechanical properties.
It has been demonstrated that ultrafine grains prepared by surface mechanical attrition treatment (SMAT) [6-10] could obviously accelerate diffusion and chemical reactions on surface by large quantity of grain boundary and high surface energy [11].
These two factors would stimulate the adsorption of active atoms on the surface of as-SMATed pipeline steel X80, which in turn accelerate the wetting and spreading of pack powder.
However, the contribution of chemical reaction and the wetting and spreading of the pack powder to the formation of active [Al] atom is affected each other, so the thickness of as-packed aluminide layer almost has a little change in this range.

IIT Roorkee – 247 667 Email: narangiitr@gmail.com Key words: - Submerged arc welding (SAW), adaptive neuro fuzzy inference system (ANFIS), bead width, bead height and distortion Abstract Weldment characteristics like bead width, bead height, penetration and weldment cross-sectional areas are the factors that contribute the weld quality.
The effects of travel speed, specimen size, external mechanical constraints and preheating on residual stresses are also discussed [6].
Seow, “Effect of welding parameters on the size of heat affected zone of submerged arc welding,” Material and Manufacture Processing, vol. 2, no. 15, 2010, pp. 649-666. [2] B.Chan, R.
Kang, “The effect of root opening on mechanical properties, Deformation and Residual Stress of weldments”, Welding research supplement, Pusan, Korea, 2001. [4] Tso-Liang Teng, and Chih-Cheng Lin, “Effect of welding conditions on residual stresses due to butt welds” International Journal of Pressure Vessels and Piping, 75, pp. 857–864, 1998

After the 48 hours, the specimens were demoulded and a long-term measurement was performed manually using a mechanical strain gauge.
When new materials are designed, new factors related to volume change emerge and thus advances in technologies need to be followed by advances in testing.
In order to be able to interpret the results, it is necessary to know (among other things) all the testing-related factors that may influence the value of shrinkage, which is why this paper compares shrinkage in specimens with different dimensions.
Choo: Advanced Concrete Technology: Concrete Properties, 1st ed., Elsevier, Amsterdam (2003) [4] H.W.
Neville: Properties of Concrete 5th ed., Pearson, England (2011) [10] H.W.

Contact analysis is required material properties defining.
However, for contact problems, on the contrary, due to the higher-order unit may lead to equivalent nodal points of contact force oscillation to affect the contact convergence.
Third, meshing quality will seriously affect the calculation results.
Second, FKN is the scale factor of contact stiffness.
The value of FKN not only need to ensure the contact stiffness is large enough to ensure that exposure to maintain infiltration at a smaller level, but also avoid the contact stiffness is so large to cause the ill-condition of stiffness matrix and affect its convergence.

The merits of the propeller hydrodynamic performance will directly affect the performance of the whole ship, so analysis of its hydrodynamic performance has become a necessary means of Marine propeller design, improvement and the checking.
Table 1 The size attribute, Material properties and boundary conditions parameter numerical value diameter 740mm leaf number 3 boss ratio 0.2 Experiments using reverse engineering technology to obtain the 3-d model of propeller and Pro/E software have been painting of flow unit model.
The definition of the boundary conditions will directly affect the accuracy of experimental results and authenticity, this experiment using professional software Gambit of boundary conditions and medium types are defined.
This is due to the leading edge contact with coming flow friction factor and other reasons lead to speed stagnation, make the pressure on the blade rise rapidly, with the increase of flow velocity pressure also decreases.
(Journal of mechanical engineering, 2010, 46(8):133-139)

There are several factors which affect the precision of the results.
The cross-shaped specimen is made of aluminum in a shape shown in Fig. 4, and its chemical composition, mechanical properties and elongationλ are shown in Tables 1 and 2.
Table 1 Chemical composition of the aluminum alloy Table 2 Mechanical properties, yield stress and elongation Fig. 4 Cross-shaped specimen Alminum Alloy Al Si Cu Fe Percent 99.63 0.09 <0.01 0.27 Mn Mg Cr Zn Ti <0.01 <0.01 <0.01 <0.01 0.01 Ｅ(GPa) σY (MPa) ν λ (%) 70.0 100.0 0.314 3.5 258 50 55 50 55 30 90 φ10 R20 R2. 548 4896φ.
[3] M.Kishida, Transaction of the Japan Soc. of Mechanical Engineering, 40-337(1974), 2526