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Research of the FEM Mesh Generation Based on Patran QianpengHan1 ,BoPeng2,a 1,2The school of mechanical and electronic engineering, Jianghan University, Wuhan, Hubei Province in China apengbo-he@163.com Key words: Finite Element Method ;Mesh Generation;Patran Abstract:Finite element method(FEM) have been widely used in modern mechanical design,mesh generation is an important part of the finite element analysis,this article discussed the process of mesh generation through two practical cases and put forward some issues we should pay more attention to.
The finite element analysis software mainly includes three core components:pre- processing module,analysis module and the post-processing module.Pre-processing part which accounts for about 45%~50% of the entire workload,post processing is about 55%~60% ,Only about 5% of the computing section[2].Pre-processing is the basis for follow-up work,the quality of pre-processing directly affects the accuracy of the model results.The core content of pre-processing is mesh generation,it will consume most of time of the pre- processing.The mesh generation is an important content in the finite element model,it has large workload and many factors should be Considered, therefore it is necessary to do some technology research to summarize the method of mesh generation.
Secondly, in order to ensure the correct transmission of force and moment,Displacement coordination is an important issue we must consider.A node of element must be adjacent node element,but not the interior point or boundary point,the node of the adjacent cells should have the same freedom properties[3].
At last good transition between the units is also a issue what we must conside,Unsmooth transition may reduce the accuracy of the results or even can not be calculated.Element shape also affects the calculation results,Regular polygon and polyhedron is the best choice.
Fig1 Generate the mesh seed Fig2 Finite element mesh of ring gear 3.2 Mesh generation of a certain type of intermediate shell Revolving body is a structure with a relatively common mechanical structure which always need to be finite element analysis, An intermediate shell of gear box will show as an example to analysis the method of generate mesh on the solid of revolution.

The basic idea that lies in the proposed method is a use of the experimentally derived mathematical model for optimization in the form of the objective function describing the dependence of the parameters of physic-mechanical properties of restorative materials or the other optimization criteria from quantitative ratios of the mixture components.
The choice of the optimality criterion and the drafting of the objective function representing the dependence of the optimality criterion from the factors that affect the value of the objective function.
The parameters of the physico-mechanical properties of restorative materials, economic, technological as well as the other parameters can serve as criteria.
The experimental verification of physical and mechanical properties of the found composition of the mixture.
M., Szadurski E.M., Specialist «restoration mortars» for stone elements: a comparison of the physical properties of two stone repair materials, Heritage Science (2014), 2:1

Introduction For the injection molding is one of critical process in the field of industry, it possesses high product rate, shorter formation cycle, low waste rate, smooth surface and easy in complicated shape formation; the precise of LED lampshade is very small, factors of insufficient filling during the process, warp and residue stress, all these defects are the cause affecting the formation of LED lampshade.
For the plastic, relation of the variables of physical property and temperature shear rate are dependent.
Fig. 5 shows response diagrams for all control factors of the injection process.
The confirmation test is a repetition of the experiment, optimal control factors is used to obtain the predicted quality characteristics
Factors A, D and F have less influence and is pooled as error. 3.

The fractal dimensions on surface of the reinforced concrete beam and the mechanical properties of the beam have the linear relationships perfectly.
It is considered usually that extracting the structural effective injury characteristic factor is the key to detect the structure damage.
The development status of the cracks will affect the safety, the durability and the practicality of the structure directly, and becomes a measure of the life cycle of the structure [1, 2].
Therefore, studying the crack propagation can be used for extracting the structural effective characteristic factor.
Thus, the accuracy of measuring the fractal dimension will affect the security of structure directly.

Thus, the following discussion summarises the factors that would affect EPD on non-conducting substrates.
This may be due to its properties such as chemical inertness, high creep, stress to rupture and tensile strength at elevated temperatures [6].
It is known that electrolysis is one of the limiting factors in aqueous EPD on conductive substrates i.e. metallic substrates.
Factors influencing EPD on non-conducting substrate Types of substrate.
Apart from that it has properties such as high emissivity, thermal protection, applicability to intricate shapes and textured surfaces [1].

Their advantage properties including anti-wearing, low resistivity, low diffusion coefficient and dielectric constant, are very suitable as the layer for diffusion barriers of Cu metallization to obstruct the chemical reaction between semiconductor materials and metals [9-14].
To find the influenced factors for a ZrNx film deposition, we performed DOE method to determine their correlation among factors.
Using the categorized technique for environmental factors and controlled factors, the interactive relationship among these factors could be testified for the better operating parameters.
There are eight factors to be selected in this experiment.
Deeply tracking the another factor affected on the depositing rate, the vacuum pressure has directly affected on the coating efficiency.

Compared to conventional fusion welding methods, the advantages of the FSW process include better mechanical properties, low residual stress and distortion, and reduced occurrence of defects [5].
In the friction stir welding process, both tool rotation speed (ω) and advancing speed (v) are known to exert a considerable influence on the thermal input and mechanical properties [11].
Processing Map 125 160 250 900 200 700 315 80 1120 100 Advancing Speed(mm/min) Rotating Speed(rpm) Defective Weld Sound Weld Good Mechanical Properties Fig. 5.
Table 2 shows the tensile properties of the joints welded at different speed ratios.
Tensile Properties of Friction-Stir-Welded Al 2024-T4.

By variation of the composite recipes a multitude of compositions can be produced which have mechanical properties tailored for individual applications.
Rate constants k were twice as high for ATZ15P, nucleation factors were also affected.
In Materials with TZP-matrix the stabilizer chosen also strongly effects mechanical properties.
Hoffmann, Relationship between microstructure and mechanical properties of silicon nitride ceramics”, Pure & Appl.
Yuan, In situ formation of LaAl11O18 rodlike particles in ZTA ceramics and effect on the mechanical properties, Ceram.

The microstructure, hardness and corrosion properties of the nitrided samples were characterised by a variety of analytical techniques.
In particular, the corrosion properties of nitriding samples(420˚C) are five times larger than original samples.
Introduction The martensitic stainless steel are often used in fabricating components requiring high mechanical properties and moderate corrosion resistance, such as cutting tools, valve parts, cutlery and fasteners.
For example, nitriding at a temperature around 500˚C can produce a thick nitrided case on an austenitic stainless steel surface, which significantly improves the surface hardness and wear properties.
While the chromium content in the surface declines, the corrosion will be worse, because chromium content is the important factor affecting the stainless steel corrosion resistance.

Solution for bending analysis of sandwich plates under various transverse loads are presented and the effect of many parameters such as plate dimensions, loading conditions, material properties of core, skins and SMA wires are studied.
Introduction Monotypic properties about laminated composites and sandwich structures such as high strength-to-weight ratio, heat insulation, good ability in sound and energy absorbing, easy installation and low production cost have been caused that they widely are being used in various engineering applications such as aerospace, automotive, naval and other industries.
Lu et al. [2] presented a theoretical model for bending of the laminated SMA embedded beams and provided the relationship between bending moment and other factors such as curvature and temperature.
The effect of various parameters such as plate dimensions, loading conditions, material properties for core and skins was investigated on the bending behavior of sandwich plates.
It could be seen that some parameters such as sandwich plate dimensions and boundary conditions are important factors affecting on the bending behavior of the square sandwich plate, normal stresses and transverse shear stress components.