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The tooth angle of these gears is one of the main factors determining their efficient operation, as well as load capacity and noise levels.
This process started with uploading CAD models of the gears to the Ansys to correctly copy their mechanical properties.
That may imply improve distribution of forces, or some inherent material properties which respond differently under different loading conditions.
The results suggest the possibility of achieving better mechanical properties when the tooth angle is set to 30°, at least under certain operating conditions.
And moreover, the study also shows that gear built-up efficiency and service life are not only related to material properties, but also the design.

Oxidation of titanium particles can readily occur during heating due to the high affinity of titanium for oxygen, which can also affect its final properties.
In addition, erosion velocities of different materials can be calculated using Schmidt’s equation with factors, F1=4.8 and F2= 1.2.
The mechanical properties of the cold-sprayed titanium deposits are critical for commercial applications.
Koivuluoto, H., Lagerbom, J., Kylmälahti, M., and Vuoristo, P., Microstructure and Mechanical Properties of Low-Pressure Cold-Sprayed (LPCS) Coatings.
-J., and Lee, C., Nanostructure formation and its effects on the mechanical properties of kinetic sprayed titanium coating.

Introduction As we known, wood is a viscoelastic material and therefore its mechanical properties are affected by temperature [1].
Based on temperatures, time-scale is also an important factor influencing the strength properties.
The effect of temperature on the mechanical properties of wood can be categorized into two classes: reversible effects, which refer to transient changes in mechanical properties at temperatures below 100ºC, and irreversible effects, which are brought about by the thermal degradation of wood constituents at high temperatures.
Effects of temperature on the mechanical properties of beech (Fagus orientalis Lipsky) and lime (Tilia begonifolia) wood.
Compression mechanical properties of wood at temperatures simulating fire conditions.

Formation of microstructure in Ni under equal-channel angular pressing (ECAP) and dynamic channel-angular pressing (DCAP), its thermal stability and diffusion properties of grain boundaries are investigated.
In the opinion of some researchers, many attractive properties of materials processed by different methods of severe plastic deformation are related to a specific state of their grain boundaries [4].
The kinetic properties of grain boundaries were determined via self-diffusion experiments carried out with the 63Ni radioisotope applied on a polished specimen surface.
The penetration profiles were determined by mechanical sectioning using a precision parallel grinder and a microbalance.
In an opinion of some researchers, the non-equilibrium boundaries are a source of long-range elastic stresses, which considerably affect mechanical properties [4].

The sample frequency of permeability greater than 0.8 ×10-3μm2 is 92.0%. 1.3.3 Relationship between porosity and permeability Generally, the porosity increases with the penetration. 1.4 The analysis and factors of reservoir diagenesis influence The reservoir property depends on diagenesis longitudinally, and the influence to reservoir is relatively complex, destructive and constructive, it directly affects the pore evolution of the reservoir.
It is concluded that formation of the research area is caused by mechanical compaction, pressure-solution, cementation and dissolution, etc. 1.4.1 The effect of mechanical compaction and pressure solution Strong mechanical compaction and pressure solution are one of the main factors of weak pore structure.
In general, chlorite precipitates earlier than the others and develops diaphragm cementation, so the pore will be blocked and the physical properties will be reduced.
Carbonate minerals in the sandstone in the study area is secondly most to the main cement laumonite, and it is the major destructive factor to the reservoir property in the research area.
The reasons for the well congestion By analyzing the deposit feature, reservoir properties, pore structure and other features in this area, we can conclude that Dingbian Oilfield is typical in low pressure, low permeability, low-yield, the “three lows" fractured reservoirs, so weak reservoir properties, low pressure, low temperature and areolate throat are the main factors the oil production is damaged by different operations, congestion in near wellbore reservoir affects the normal production wells reducing fluid production and oil production.

Improving the Surface Finish and other Properties of Engineering Metal Parts Muhannad A.
The selective laser melting (SLM) is one of the most common processes employed for research and industry due to the significant capability in the manufacture of parts with exceptional properties and geometric complexity [1,2].
The average surface roughness Ra might be more than 40 microns depending on many factors including the powder particle size, the build layer thickness, the laser beam power, and the scanning speed [7].
The modified layer of the processed samples exhibits the same microstructure with full chemical and mechanical bonding with the bulk material.
This achievement offers great benefits compared to the traditional chemical, mechanical, and electro-polishing which results in tool wear and abrasive debris.

Table1 The test results of the snap force and cutting force of the hickory carpopodium Carpopodium diameter （mm） Carpopodium length（mm） Snap force (N) Cutting force (N) Maximum Mean Maximum Mean Maximum Mean Maximum Mean 33.2 20.6 38.2 25.6 110.9 91.2 159.3 142.6 Moreover, known from the auxiliary test and practical task, the actual picking effects of the fruits are influenced by some other factors.
It will directly affect the operation of the feasibility and equipment carry convenience if the picking rod length cannot be adjusted.
Picking rod Fig.3 Picking rod length control chart Conclusions Based on the mechanical properties of the hickory nuts picking, existing ways and picking process research, the impeller rotating shot down picking method and analysis model are put forward.
[10] Jizhan Liu , Pingping Li, Zhiguo Li, Hanping Mao.Experimental Study on Mechanical Properties of Tomatoes for Robotics Harvesting[J].Transactions of the CSAE.Vol 24 No.12 Dec,2008:66-70.
In Chinese [11] Yanmei Qing, Yuhua Cao, Changyou Li, Weizu Wang.Mechanical Properties of Fresh Longan Hulling[J].Transactions of the CSAE.Vol 26 No.5 May,2010:122-126.

Surface roughness directly influences many properties of the machined parts, such as friction, wear, lubrication, fatigue, and so on.
Parameter design based on the Taguchi’s method has been successfully applied in a number of metal cutting investigations by researches and practitioners alike for its distribution-free and orthogonal array design, and it provides a considerable reduction of time and resource needed to determine important factors affecting operations with simultaneous improvement of quality and cost of manufacturing [2, 3].
Four cutting parameters, i.e., cutting speed vc (A), feed per tooth fz (B), radial depth of cut ae (C), and axial depth of cut ap (D) were selected as independent factors to analyze their effects on surface roughness.
As can be observed in Fig. 2, the main parameters affecting surface roughness are the radial depth of cut and the axial depth of cut.
As can be seen, the interaction of feed and axial depth of cut is the dominant primary interaction affecting the surface roughness.

Fan(2012) used the correction factor method of damage extent based on strain energy, identified and diagnosed damage of plate structure.
(2) the ultrasonic testing technology based on pulse echo method uses the properties that wave can reflect when meeting different medium to detect, due to wave attenuation properties differs in different materials, and the method has high sensitivity, low cost, and high efficiency
But due to the existence of such factors that the dynamic characteristics can be measured by the model error, measurement noise and civil engineering structure are not sensitive to the local stiffness change, the method is limited in practical application.
A strain energy-based damage severity correction factor method for damage identification in plate-type structures[J].
Mechanical Systems and Signal Processing, 2012, 28: 660–678.

However, unlike mechanical fastening welding would lead to a changed microstructure with a softened fusion zone and an adjacent heat-affected zone (HAZ).
All these factors will have a profound influence on the fatigue life of a welded structure compared to fastened one.
These factors are necessary for the damage-tolerant design necessary for safety-critical structural members in civil aviation.
The composition and mechanical properties are shown in table 1.
- 2 - Cu [wt%] Mg [wt%] Zn [wt%] Mn [wt%] Cr [wt%] Si [wt%] Fe [wt%] UTS [MPa] 0.2% PS [MPa] Elongation [%- On GL =25] 3.7- 4.5 1.2- 1.5 <0.25 0.15- 0.80 < 0.10 < 0.15 < 0.20 470 360 20 Table 1: Chemical composition & mechanical properties of AA2024- (the alloying elements are shown in the table; the balance is aluminium) The VPPA welding process was applied to weld two plates of the alloy of dimension 400 × 140 × 12.5 mm3.