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And its main composition and mechanical properties [2] is shown in table 1 and table 2.
Table 1 The mechanical properties of 7050-T7451 aluminum alloy σb (MPa) σys (MPa) ε (%) E(GPa) Longitudinalhorizontaltrt(L—T) 483 414 4.0 26.0 Transversal (T—L) 483 414 8.0 24.0 The test theoretical basis.
So if the cutter, cooling method and the materials are specified, the main factors which could affect the milling force would be the milling speed, feed rate, milling depth and milling width.
There are four factors to affect the milling performance, so the orthogonal experiment method is used in the high-speed milling 7050-T7451 aluminum alloy experiment.
The four milling factors are as the experiment factors.

Based on previous, most researchers analyses the chain process factor affect the strength of material.
The quality of the final product, it depends on several factors have been considered either from cutting situation, machining parameter and other factors.
Majority researchers have approve that the mechanical properties and structure of aluminum from direct recycling almost similar to current aluminum recycling.
The other factors to be considered during compaction process is, sufficient pressure during compaction process to get better consolidation material .The Extrusion process factor also will be affected the strength of material, such as the matching temperature during hot extrusion process.
Gronostajski, "Mechanical and tribological properties of aluminium-base composites produced by the recycling of chips," Journal of Materials Processing Technology, vol. 106, pp. 23-27, 2000

China 430068 ychdeng8@163.com 758152883@qq.com Keywords: gas suction turnip seed metering device, the geometric parameters, flow velocity, adsorption of distance Abstract: the gas suction turnip seed metering device is the core requirement of precise seeding, in this article, through analysis and research of the geometric parameters of radish seeds, affect the seed is obtained by means of experiment draw the related factors of seed suction nozzle, including adsorption seed when the surrounding air velocity and adsorption under a certain air needed distance, and the specific parameters of these factors were determined.
The research content of this article This paper determined with suction type precision metering device and radish seeds as analysis object, based on the research of the geometric parameters of the seed, the analysis of influence factors in the process of seed adsorption, put forward the system of theoretical research method, the main contents include: 1.The geometric parameters of radish seeds 2.Analyze the stress of seeds in the flow field 3.suction hole flow field around the dynamics characteristics radish seeds of geometric features Metering device the essence of the theory research is the analysis of the motion law of the seed, the size and the shape of geometry size, such as geometric features, are the important factors that affect seed movement, also is the basic foundation of theory of metering device design.
Figure [1] Radish seeds three axis size frequency distribution Particle size is often referred to as the average of the average particle size, the calculation method of average particle size has a lot of, this article mainly analyzes the seeds in the suction line kind of the mechanical movement in flow field, due to the size of the seeds in the flow field stress and its surface area, therefore adopted based on the average particle size of the surface of d, for computing method: （1） By measuring, the average length, width and thickness of samples were 3.03, 2.92, 2.87, calculated。
according to the analysis of the mechanical motion process of seeds Of precision design, the absorption ability is an important technical index, it mainly depends on seed in suction mouth the mechanical movement rule of air flow field, precision metering device is the emphasis and difficulty in theoretical design.
Figure [2] Suction nozzle flow field in the geometric model Table [1] Geometry size and fluid properties geometry The parameter value Fluid properties The parameter value Import cone large (small) size 0.03（0.006） density 1.2 Imported high 0.01 viscosity 1.5x Excessive zone height 0.002m Outlet pressure 0Pa Exit diameter 0.001m Inlet pressure 5KPa/10KPa/20KPa/30KPa/40KPa Export highly 0.006m Reynolds number Re 1~20x 3.1.2 Mesh to the model In the grid, in order to get more tidy, regular grid, the geometric model is divided into three parts, the upper part is divided into a rectangle, the middle is a transition area, the following is an isosceles trapezoid.

A further comparison was made with corresponding properties of 100% wt E-glass fiber composites sample.
There are several factors that affected the properties of natural fiber products such as fibers growing environment, environment temperature, percentages of humidity and the nature of the soil or the composition of the soil.
The main concern to produce bidirectional samples are to have better mechanical properties as there are more orientations of fiber per number of layers of fabric resulted in better stress distribution.
The un-treated samples shows inconsistent trend of flexural properties.
Summary Observation on impact value shows a more consistent pattern for treated Kenaf fiber composites samples thus suggested a more control mechanical properties.

A Study on the Factors Affecting the Uniformity of Urea and Exhaust Gas Using an SCR Simulator Munseok Choe1,a, Dogyeong Kang1,b and Dooseuk Choi2,c* 1Department of Mechanical Engineering, Graduate school, Kongju National University, Korea 2Division of Mechanical & automotive Engineering, Kongju National University, Korea acms0290@kongju.ac.kr, bdogyeong93@smail.kongju.ac.kr, c*dschoi@kongju.ac.kr Keywords: SCR (Selective Catalyst Reduction), NOx, Exhaust system, Mixer, Uniformity index Abstract.
An EGR (Exhaust Gas Recirculation) + LNT (Lean NOx Trap) system and a Urea SCR (Selective Catalyst Reduction) system are mostly developed as a plan to satisfy Tier 4, Euro-6 regulation and, to increase NOx reduction efficiency, development should be carryout out by changing the design factors such as the catalyst, mixer and injector in the LNT and SCR systems[5,6].
Table 1 shows the physical properties of water-soluble ammonia.
Due to the property of the non-mixer type, a flow has been generated that directly contacts the uniformity detector immediately after urea injection.
S., Thermodynamic kernel, IMEP, and response based on three plasma energies, Journal of Mechanical Science and Technology 32(8) (2018) 3983-3994

The tool failure by wear has become one of the critical factors seriously deteriorating the production efficiency: it not only affects the machining accuracy and surface quality of parts but also may cause the cutting tremor, which damages tools and workpieces and directly affects the smooth operation of cutting[1][2].
PCrNi3MoVA steel has excellent mechanical properties after modification and is critical material in the ordnance industry.
Its chemical composition and physical and mechanical properties are listed in Tables 1 and 2.
Ø The mechanical and physical properties of PCrNi3MoVA gun steel (namely, high hardness and strength) determine that severe tool wear occurs during cutting.
Microstructures and mechanical properties of high strength gun steels[J].Ordnance Material Science and Engineering, 2003, 26(2), pp7~11

Manganese steel (Hadfield) is one of the important alloys in industry due to its special properties.
Heat treatment is the main process through which the desired mechanical properties and microstructures are obtained in Hadfield steel.
The factors that affect on heat treatment are austenitizing temperature, austenitizing time and quenching rate.
Table 2 shows these factors and their level.
[7] T.Sasaki, “Physical and Mechanical Properties of High Manganese Non-Magnetic Steel and its Application toVarious Products for Cammerical Use”, Transactions ISU, 1982, Vol. 22, pp.184-192

The mechanical properties were measured with respect to the strength, hardness and toughness using Universal Testing Machine, Vickers Microhardness, and Charpy method respectively.
The weld-bead geometry produced by arc weld plays an important role in determining the mechanical properties of the weld and its quality [8].
In the year 2007-2011, in Indonesia, the percentage of the factors causing the sea accident by technical is 59 %.
At temperatures above the transition temperature, the weld metal has a ductile properties while at temperatures below the transition temperature of the metal having brittle properties.
Edwards, The influences of addition and interpass temperature on the microstructures and mechanical properties of high strength SMA weld metals, ISIJ Int. 35(10) (1985) 1222-1231.

Metalloscope results also showed that microscopic structure of different specimens with different thicknesses is also a factor affecting the fracture toughness.
For example, Arzt et al have demonstrated that size effect on the material properties of foil materials was attributed to dimensional and microstructural constraints [3].
Yoonjoon et al analyzed size effect on the mechanical properties of thin polycrystalline metal films, and developed a model that correctly predicts the observed influence of film thickness and grain size on stress evolution during thermal excursions [4].
The major factors affecting these two contributions are considered to be related to the combined action of the microstructure, the presence of inner micro-defects and roll marks, and the level of stress triaxiality.
Thickness of V Specimen 2, conclusion can be drawn that the microscopic structure of materials as well as thickness is one main factor affecting the fracture toughness.

Effect of cryogenic treatments on mechanical properties of 2A11 aluminum alloy were studied.
The influences of different process parameters on mechanical properties of 2A11 aluminum alloy were compared, and the results showed that cryogenic treatment could improve mechanical properties of 2A11 aluminum alloy.
Since then it became a supplementary process to improve the mechanical properties of metals.
Microstructures and mechanical properties of metals in cryogenic treatment drew attention of the researchers.
In the case of 2A11 aluminum alloy, the obtained results suggest that cryogenic treatment produced positive effects on the mechanical properties, and the results are strongly affected by the treatment parameters.