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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.

In the service of OPCB, the stress in fiber is different from different embedded structures, which will affect the reliability of fiber in OPCB.
The section size of groove in OPCB can affect filler’s volume and thus affect the stress in glass fiber, which will promote the growth of micro-crack in the surface.
As time goes on, the crack may lead to fatigue fracture of glass fiber, and seriously affect the optical signal transmission.
Relevant material property is shown in Table 2.
Of course, it is obviously that thermal stress is not the only reliability factor of glass fiber on OPCB, and not only the embedded structure will affect the stress in glass fiber, further research will be done in the future.

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.

Finite-element Analysis The use of composite materials is ever increasing due to the various advantages they possess in terms of mechanical and chemical properties, tailoring to specific needs, weight savings, aesthetics, etc.
The properties of composite material and metal are listed as table 1.
Because the composite material property is direction dependent this will affect the dynamic performance.
It is found the rotational load is the major factor.
Anisotropic inhomogeneous deformation of composite materials will affect the dynamics properties of the high-speed rotating flywheel rotor.

Reservoir water level is one important factor influencing the stability of landslides.
The pore water pressure and seepage force in landslide during reservoir impoundment and drawdown are two important factors affecting the stability of a reservoir landslide.
Each seepage mode will produce different seepage force or pore water pressure and thereby affect the stability of landslide, which is shown in Table 1.
Table 1, Seepage mode of landslide and its mechanism in Three Gorges Reservoir area Landslide type Landslide groundwater seepage mode Mechanical mechanism Classification basis and landslide stability features lag behind impoundment (X-I) (1)The rising rate of groundwater level is smaller than that of reservoir water level, landslide has poor permeability；(2)The reservoir water level is higher than the groundwater level of landslide and reservoir water infiltrates into landslide and thereby produces seepage force opposite to the inside of landslide which will enhance the landslide stability;(3) Landslide fails due to slope body softened and bank rebuilding;(4) Landslide stability depends on the properties of the rock mass structure and rock lithology.
Landslide stability depends on the properties of the rock mass structure and rock lithology.

The region that exist widmanstatten microstructure is located in heat-affected zone where the threaded bolt and base up cover-plate connected by welding.
The mechanical property of widmanstatten is worse than coarse crystal grain, the impact toughness is extraordinary low, and it is also very brittle and can easily form micro cracking.
In terms of mechanical connection, generally welding and threaded bolt won’t use at the same time.
In order to positioning conveniently, some manufacturing enterprise fix threaded bolts and cover-plate by point welding, just as the case, welding of region that threaded bolts cross the cover-plate result in the change of threaded bolts metallographic structure of heat-affected zone, mechanical properties deteriorate, finally lead to threaded bolts breaking off.
Periodic checking must carefully examined maintenance record, because crane maintenance is not obligation, maintenance quality of enterprise that use cranes is the key factor of ensure crane machinery running safety.

The energy form of laser beam is gaussian heat source, which possesses a unequal property in energetic distribution.
The microhardness of heat affected zone reached HV730 because of the existence of martensite.
Fig. 4 also shows that the thickness of laser cladding coatings and heat affected zone are about 900 μm and 800 μm, respectively.
Structure, Processing, Properties, and Selection, Fifth Ed., Publishing House of Electronics Industry, BeiJing (2007)
Zheng, Mechanical Engineering Materials, National Defense Industry, BeiJing (2007)

These exceptive properties provide innovative clues to the method for solving erosion problems.
Table 1 Levels of various control factors.
The value of yj1 can be used to determine the optimum level of the control factors.
The best combination of the factors results in the lowest yj.
Acierno, et al, Solid particle erosion and viscoelastic properties of thermoplastic polyurethanes, Express.

Molten Ti is lively, and it is easy to react with the mold material during in the investment casting, and hence to form casting defects such as α contaminated layer in the metal near the surface and gas porosity, resulting in the deterioration of the surface quality and castings mechanical properties.
Introduction Ti3Al-based alloys are high-temperature structural materials, and be found a potential applications in aeronautical, aerospace, marine, and automotive industries, owing to their low density, high specific strength, excellent corrosion and creep resistance, and appropriate high-temperature properties[1-4].
So they can take place chemical reaction with almost all of the mold materials to form a brittle reaction layer, and then the casting surface was contaminated, the surface quality and mechanical properties of the casting decreased [10-12].
Because the titanium has high chemical activity, Ti element can react with the mold material, even the mold material is the ZrO2 (Y2O3 stabilized), which is consistent with the properties of Ti.
Beijing: Defend Industry Press, (2001),103 [10] Dippel J D, Klingensmith L G: Factors Which Affect the Quality of Titanium Casting. 17th Nationals SAMPE Technical Conference[C], New York: SAMPE, (1985）,151 [11] Krone K Herstellung, Eigenschaften und Verwenden von Titangus Z：Metall[J], 67(1976), 30 [12] Colley R H.

Accordingly, several efforts have been made towards a systematic quest for standardization of test methodologies and an understanding of factors influencing the resistance of concrete to freezing and thawing.
Mechanical Test Results.
Freeze-Thaw Cycles Freeze-Thaw Cycles Relative Dynamic Modulus of Elasticity (%) Relative Mechanical Strength (%) CM-0 PM-0 a) b) c) Considering a linear variation of relative dynamic modulus of elasticity between 36 and 72 cycles, durability factors of 12.78% or 9.20% were obtained for this cement based composition, depending on the total amount of freeze-thaw cycles considered for the end of experimental program (216 or 300 cycles).
The flexural and compressive strengths were also severely affected.
Mitchell, in: Significance of Tests and Properties of Concrete and Concrete-Making Materials -STP 169C, edited by P.