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Structure Analysis and Improvement of Mining Explosion-proof Control Switch Case Based on ANSYS CHEN Fei1, a, SHAO Zhi-hao 2,b and LI Jian-ming1,c 1School of Mechanical and Electrical Engineering, China University of Mining and Technology, Xuzhou 221116, China 2Shanghai Zhenhua Heavy Industry Co.
The traditional design is imperfect for lack of in-depth analysis and mechanical calculations of the case structure.
Define将焊接板作为连续整体，不考虑焊缝处材料特性的变化以及焊缝对传力路线的影响 ;Defined welded plate as a continuous whole, without regard to the effect of changes in material properties of weld and weld line on the transmission line; 3) In water pressure test, the cover of the hydraulic press closes the sealed chamber, so the case is analyzed by establishing the finite element model of the shell.
It is the necessary measure which convert complex model to finite element model, generally it does not affect the overall analysis of the general structure.
The main factors that affect the calculation include the number and density of the grid.

With the advent of high-power pulsed lasers, laser peening has emerged as a new and very promising technique to improve the resistance properties of materials to fatigue, wear and corrosion.
Introduction The use of high-power laser outputs for the generation of shock waves to improve material properties has been widely investigated since the 1970s [1-3].
With the advent of high-power pulsed lasers, LP has emerged as a new and very promising technique to improve the resistance properties of materials to fatigue, wear and corrosion.
In order to optimize laser peening parameters, it is necessary that the peak pressure P of shock wave induced by laser impacting on the materials surface should larger than the dynamic yield strength D ysσ under purely uniaxial strains in the peened materials, which depend on the mechanical properties.
These factors jointly improve greatly the service life of materials.

As a result, Fe – Gt : N = 1:3 catalyst had the greatest electrochemical properties which is identified by the large area of CV curve.
The Fe, Ni, Co and Mn are 3d-transition metals which can enhance the intrinsic activity by 2-4 times due to a change in morphology, electronic properties, inhibition towards anion adsorption and surface sensitive factors [8].
Furthermore, electrochemical and physical properties were characterized.
Summary Various carbon and nitrogen ratio of catalysts have different electrochemical properties and particles morphology.
Fe2O3 and Fe3C have important role to improve the electrochemical properties.

In the past, researches on the mechanical properties of the CFST columns mainly included the bearing capacity, deformation behavior and energy-dissipation ability under the influence of the confinement coefficient and steel ratio [1-5]; But under the same steel ratio, the research on how variation of section shape of steel tube affected the mechanical behavior of CFST columns was relatively rare.
The working mechanism, ductility and ultimate bearing capacity of this new type composite CFSST short column was studied and the effects of variation of steel tube’s section shape on the mechanical properties of CFSST short column were analyzed with the change of confinement index, concrete strength and steel ratio.
C30 and C60 concrete were used in the specimens, the concrete material properties were determined by testing the concrete cubes.
This indicates that the mechanical properties and working states of specimens can be improved better by the adjustment of column’s section form and no increasing of the steel ratio, the mechanical state of composite columns was close to ideal elastic-plastic body.
The load-displacement curves for four specimens with different parameters are showed in Figure 4, the influence laws of various factors on the mechanical properties of the composite CFSST columns are analyzed as follows: Figure 4 Load-placement curves 1.

Time reversal technology[3]: Windowing and capturing, using space-time focusing properties of time reversal, effectively inhibiting and rational using multi-path effects, which has an accurate measurement of the signal between the nodes of the arrival time and distance.
Suppose the distance weight value of i-th beacon node to the unknown node is , using the least squares method [6] to solve the weighted linear equation: (4) , x, y coordinate value is what we want to get. 3.2 Weighted multilateral positioning algorithm error analysis Factors affecting ranging accuracy on the entire process of locating are ranging error, beacon node position error and residual.
Ranging error, the reference node position errors and residuals are independent random error, we can use a synthetic theory of random errors comprehensive analysis of the various factors that impact the positioning accuracy error.
But in the case of non-line of sight transmission, Its ranging error increase because the path of electromagnetic waves is no longer a straight line; in terms of multilateral position algorithm the weighted multilateral position algorithm using different weighting factors to reduce positioning errors, it increase the positioning accuracy and has the characteristics of stable, high-reliability.
Error Theory and Data Processing, Mechanical Industry Press.pp.114 -121, 2004

Bi-metals enable a product to have two or more physical, chemical, mechanical properties of different metals, and achieve a metallurgical bonding on the interface [3-4].
Although each metal remains the original features, its comprehensive physical, chemical, mechanical properties are far superior to those of a single metal.
A few cracks occurred on the interfaces between primary silicon particles and the matrix, resulting in poor mechanical properties of cast Al-20 wt. % Si alloy.
Mechanical properties of the interfacial The mechanical properties of the bi-metal samples and the samples composed of single material were investigated by tensile test.
It is thought that if the heating time were decreased by induce heating, the mechanical properties of the bi-metal composite will be better; higher forging force is necessary to seal the voids occurred during hot forging, in order to improve the mechanical properties.

The testing efficiency and testing accuracy of frequency are mainly affected by the environment and the function of instruments.
At the same time, by considering both model under the complex mechanical boundary or displacement boundary conditions, the analysis and solution of cable force are complex, and it is difficult to adapt to cable component with different characteristics in engineering.
The precision of cable force will be affected by parameters of stiffness, sag boundary conditions, gradient, temperature, and so on.
This is due to: the mechanical property of short cable with smaller tension are similar to the property of beam, the bending stiffness affects its frequency obviously, but when the tension becomes larger, the mechanical property of short cable is closed to the string’s property, the fluctuation of axial force leads the change of frequency, and the effect of bending stiffness is weakened; When the tension of long cable is low, its geometrical nonlinear is obvious, but with the growth of tension, the model approaches to string.
For some special cables, their material and geometrical size are irregular change, we can also use degenerated element to relatively simulate and analyze them with considering these factors.

Structure and Properties of Ultrafine-Grained Cu-Cr Alloys after High Pressure Torsion D.V.
Introduction Severe plastic deformation (SPD) is well known now as a method to obtain ultrafine-grained materials with principally new physics-mechanical properties [1,2].
In a number of studies [3-8], the SPD method applied to widely used low-alloy chromium and zirconium bronzes was shown to improve their mechanical properties and thermal stability.
However, the size of the chromium phase in the cast material is large, about 10 microns, and this reduces the plasticity and strength properties of the alloy.
This leads to the heterogeneity of properties.

The effect of different parameters during thermo-mechanical processing on the earing behavior of AA3003 aluminum sheets has been investigated.
This thermo-mechanical treatment which involves both cold plastic deformation and recrystallization, results in sheets with anisotropic mechanical properties.
These thermo-mechanical treatments, along with the composition of the alloy, determine the crystallographic texture which is believed to be the most important factor affecting the earing behavior of the material [2-4].
In addition to the rolling and annealing operations, homogenization of the cast material is generally considered as an important step which can also affect the earing behavior [11,12].
Kallend (Eds.), Texture and the properties of Materials, Proc.

Fine dendritic microstructures in castings, characterized by the dendrite arm spacing are recognized to yield superior mechanical properties if compared with coarser ones.
Much research has been devoted to the definition of the factors affecting the fineness of the dendrictic strucuture.
They identified as the main factors limiting the theoretical predictions of λ2 in complex alloy systems, the precipitation of intermetallics which masks the effects of further coarsening and the assumption of linear trends of liquid concentration with time.
Hence, in columnar dendritic mushy zones (which is the case of all castings examined in the present study), the interdendritic permeability is affected by the dimension of the interdendritic channel, characterized by λ1 and by the tortuosity of this channel affected by λ2.
These solidification thermal variables were shown to affect significantly the formation of dendrite spacings during transient directional solidification, which strongly affected the development of porosity.