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Research for an Automatic Measurement System for Centroidal Deviation of Projectiles Based on Three Points Method Guonian Yao 1,2,a , Junhu Wei 1,b , Hao Sun 2,c and Guoji Sun 2,d 1 Systems Engineering Institute, Xi'an Jiaotong University-China 2 The Huayin Ordnance Test Center-China a gnyao168@126.com, bjhwei@sei.xjtu.edu.cn, cjiaodong@stu.xjtu.edu.cn, dgjsun@sei.xjtu.edu.cn Keywords: automatic measurement, measuring efficiency, working principle, quantitative analysis Abstract: In order to improve the measuring accuracy and efficiency of projectiles' centroidal deviation, the working principle and the relevant calculation formulae based on three points method are described in detail, the main factors affecting precision are discussed and quantitative analysis on precision of the equipment is made.
Fig.3 Schematic diagram of locating with arc Fig.4 Mechanical structure diagram of equipment C) Method to rotate 90° Precisely.
Research on method for measurement of the parameters about the properties of warhead's mass[J].
Journal of Mechanical Strength, 2002,24(4):623-625( in Chinese) [3] Qian Yongbo, Wu Bin.
Mass Properties Measurement Handbook[J] .

The temperature and Residual Stress Distributions of Butt Weld Pass on Nickel Alloy 690 Plate Chun-Ho Yin1,a, Chao-Ming Hsu2,b and Jao-Hwa Kuang1,c 1Department of Mechanical & Electro-Mechanical Engineering, National Sun Yat-sen University, Kaohsiung, Taiwan, 80424, R.O.C. 2Department of Mechanical Engineering, National Kaohsiung University of Applied Sciences, Kaohsiung, Taiwan, 80778, R.O.C.
The temperature dependent material properties are used.
Thus, welding quality is one of the key factors influencing the reliability of the structure. [1] In 1998, Murugan et al. [2] used finite element method to simulate the possible effect of welding parameters; i.e. parent metal thickness, parent metal material, number of weld passes, weld speed and welding heat input, on the variation of temperature profiles during welding.
The heat affected zone of double-layer weld pass is greater than single-layer weld pass. 2.
With the same number of weld passes, heat affected zones decreases with the increase of weld speed. 5.

Ultraviolet radiation is one of the major factors that affect weathering of polymers.
Introduction High density polyethylene is one of the most used polymers for its good properties: low cost, excellent electrical and mechanical properties, good chemical resistance and processability.
However, the natural fluorescence properties of macromolecules are not often adequate for the desired experimentations.
Upon irradiation, the polymeric matrix modifications affect the fluorescent properties of additional molecule Rh6G.
The addition of Rh6G to the polymer structure has been check in terms of the mechanical behaviour and of the DSC results.

The demand for titanium and its alloys, especially Ti6Al4V has gained a rapid pace in the recent decades because of its excellent mechanical and metallurgical properties.
Ramulu [12] presented that most significant parameter in drilling process affecting the cutting force is feed rate.
Titanium alloy Ti6Al4V is widely used and offer high strength, depth hardenability and elevated temperature properties up to 400 ̊C [6].
Chemical composition, mechanical and physical properties of test specimen is summarized in Table 1 – 3.
· According to experimental results from main effect plot as well as ANOVA, feed rate was the most significant factor affecting the thrust force

The austenite grain coarsening does not occur uniformly, hence it can affect mechanical properties such as tensile, fatigue and so on.
Introduction Recently, because of the economical stagnation, cost reduction of material has become an important factor.
The austenite grain coarsening does not occur uniformly, and this phenomenon can affect its mechanical properties such as tensile, fatigue, etc.
Zener has shown the relation between R and r the mean radii of matrix grains and dispersed particles as follows: 4 3 r R f β β   = =   (1) where fis the volume fraction of dispersed particles and βis the correction factor adjusting the pinning force.
It is understood that suitably controlling the free-Ti and the Thermomechanical history are important factors for both the fine precipitation and the normal austenite grain growth.

That is to say, since a neutron collides onto the crystal lattice of a metal and produces a primary defect, until the mechanical properties of the material are affected, the scale of time goes from the picoseconds to decades and the dimension from the atomic level up to the size of the vessel [4].
Elemental influence on mechanical properties [2] Element Description of the element influence on mechanical properties Impurities Cu Odette et al. [13] concluded that a copper content greater than 0.1 wt% generates copper-rich precipitates that are responsible for irradiation embrittlement of reactor pressure vessel materials.
P Phosphorus content greater than 0.02 wt% negatively affects the mechanical properties of the material [14] because it increases the brittleness of the material at higher temperatures.
Alloy elements Mn Manganese improves the mechanical properties of alloy steels.
By its use it is possible to study the influence of different alloying elements and impurities on the mechanical properties of materials.

As the alloy is very sensitive to the stress, so as to get good magnetic properties, adding some trace elements in the alloy, can greatly improve the magnetic properties.
Except for melting process and heat treatment process, the trace elements changes is the main factor of affecting the magnetic properties.
This article will mainly research on effects of Mo element on the magnetic properties.
Mo is one of the main factors of inhibiting high nickel soft magnetic alloy from forming ordered structure Ni3Fe, the process of ordering effects on the magnetic properties, this is due to that the ordering caused nickel atoms rearrange in face-centered cubic crystal, changed the distance between Ni atoms, and causing the changes of its outer orbit electron spin exchange energy, to change magnetic properties of alloy.
Taking all factors, better alloy components is Ni 78.00wt%, Mo 5.00wt%, Mn 0.90 wt%, Si 0.40 wt%, Fe rest.

Najm et al.[6] The impacts of several WEDM factors on the heat-affected zone, white layer, and Surface Roughness (SR) of high-speed steel are being investigated.
Methodology and Material used The workpiece material chosen in this study is an alloy of brass metal ASTM (C34500), with (250 x 70 x 20) mm in dimensions, as shown in figure 1, and the chemical composition and mechanical properties listed in tables (table 1, table 2).
The mechanical properties of metal Material Tensile Strength [Mpa] Elongation [%] Yield strength [Mpa] Hardness, Rockwell B Thermal Conductivity [W/m.
The procedure is explained using an analysis of variance (ANOVA) to identify the critical input factors that influence surface roughness.
This experimental work focused on the basic factors and variables that mainly affect (Ra) and variables such as peak current, spark gap, and specific pulse time, which affect the surface quality (Ra).

Analysis on the Mechanical Properties of Connections on Cold-Formed Square Steel Column and Beam Yong Yaoa , Yun-peng Chub School of Civil Engineering and Architecture, Southwest University of Science and Technology, Mian yang, Sichuan 621010; China ayy001221@163.com , bchuyunpeng@swust.edu.cn Keyword: Cold-Formed Square Steel Tubular; Welded Beam-Column Joint; Bearing Capacity; Ductility; Stiffness Abstract.
The joint is the key to the design of structure, so it needs further research on the mechanical properties.
In the connection of beam-column, when the column joints using screw connection and under the shear force, the cotter hole of thinner thin-walled bar will be increased gradually, affects the mechanic behavior of the joints.
Because axial compression ratio had great influence on mechanical properties of node, under different axial compression ratio, the bearing capacity, stiffness etc of two types nodes were analyzed and discussed by finite element method to provide reference for the engineering application.
Study the Mechanical properties of joints under different axial compression ratio, there are five conditions: fully restrained at the top of the column, axial compression ratio is 0.2, 0.4, 0.6, 0.8.Apply load on the cantilever end of beam, loading controlled by the displacement, loading level is multiple of 10mm,such as 20mm,30mm and so on, loads on the joints to their failure.

Very high cooling rates (even 10^8 K/s), the cooling differences and the thermal conductivity in different directions are the most important factors that influence the formation of a very fine cellular structure [21, 22].
It is apparent that there is no anisotropy of mechanical properties in the volume of material.
Thijs, et al., Microstructure and mechanical properties of selective laser melted 18Ni-300 steel, Phys.
Ding, et al., Microstructural evolution and mechanical properties of maraging steel produced by wire + arc additive manufacture process, Mater.
Wang, Effect of heat treatment on the microstructure and mechanical properties of maraging steel by selective laser melting.