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Tooth surface appeared more obvious gray spots, in severe tooth surface material would emerge large spalling, cracks and even broken teeth [3].There was many factors which caused gear tooth wear but the most important wear mode of them was fatigue wear, adhesive wear and fretting wear[4].
The Calculation and Analysis of Involute Helical Gear Wear According to the theory of integrated wear[5],the fundamental principles of integrated wear calculation was that the allowed position change quantity of mating surface was determined by mechanical parts working performance ,that was integrated wear, which then derived the wear life of mechanical parts in consideration of gear indexing accuracy and smooth transmission.
Considering some factor impacted on gear wear, such as the tooth surface characteristics, lubrication conditions, working conditions, etc, the coefficient,,were introduced, then the normal line wear value of gear was: (13) Then, the total normal wear value of gear pair in the running period could be obtained
Therefore, as the wear life calculation or anti-wear design was carried out, some influencing factors should be taken into account, such as the gear material properties, surface characteristics, technological parameters, gear lubrication condition, operating status, which should also be collected from extensive test data and could be used to modify models more practical.
Mechanical Research & Application, 2009,(6):50-54.

Furthermore, BAp is an ionic crystal with a hexagonal lattice of the space group P63/m, and it has anisotropic mechanical and biochemical properties [3].
Therefore, it is important to identify other parameters that control the mechanical properties of bone.
This finding indicates that the bone shape was not remarkably affected on the bone shape by rhM-CSF administration in the normal mice [9].
This suggests that M-CSF is one of the most important factors for producing the preferential BAp orientation through normal bone remodeling related to stimulating osteoclast production.
In conclusion, M-CSF is one of the important factors controlling the preferential alignment of the BAp c-axis in the femur.

Research on Genetic Algorithm in mold optimization design Xi Chen1, a, Baosheng Zhao 2 1School of Mechanical Engineering & Automation, University of Science and Technology Liaoning, Anshan, Liaoning, 114051, China 2International Office, University of Science and Technology Liaoning, Anshan, Liaoning, 114051, China abubble_chris@163.com Keywords: Genetic algorithm, Species evolution model, Mold optimization.
So, make k-βx instead of k, i.e. increasing saturation effect is proportional to x, β is scale factor.
The ultimate aim of gate arrangement optimization is to find a reasonable gate location, so that improve the property and quality of products.
Factors affecting the quality of the plastic parts are many; warp deformation is one of the most important flaws.
Based on the quantitative analysis of influencing factors of warp and material properties, there are the four main factors: inlet pressure, overvoltage unit percentage, overheating unit percentage, and temperature difference.

The measured data results show that: the nine storms environmental load affect capacity of drilling significantly, the different parts of the main member stress have the different degrees of influence by environmental load, the maximum can reach 50.8%.
In order to protect the safe operation of marine operations reduce risk, it is necessary in extreme operating conditions, that is, when the mast on a larger work load (suspended weight close to the allowable hook load), consideration of environmental factors on the derrick by the force of real-time monitoring[1,2].
Design height 48.7m, racking platform with high 25m, the maximum rated static hook load is 450 tons.井架从上到下分成14个小节，如图1所示： Derrick top to bottom into 14 small sections, as shown in Figure 1: The derrick steel with mechanical properties similar to the domestic 16Mn steel,井架结构杆件均采用梁单元模拟，井架共划分为420个单元，215个关键点。
Maximum hook load evenly to the derrick at the top of the four nodes along the Z direction were imposed-1125kN concentrated force, according to SY/T5025-1999 "specification for drilling and well servicing structures" Section 7.1.2 states that "the dynamic stress and wind caused by floating ship, when the wind load, dynamic load alone, or with the design dead load and live load combined, the Movement load of stress as ship floating increase in the allowable stress on the third one" Therefore, the maximum hook load multiplied by the load factor of 1.3.
Fig. 6 Measuring points 1 to 4 stress curve Fig. 7 Maximum Stress curve 井架主杆受力不均情况更为明显，井架主杆各节段最大应力值见表 6 ，各节段最大应力曲线如图 7 所示： The main member stress uniformity were more evident, the main member maximum stress value of each segment in Table 3, the largest segment of the stress curve shown in Figure 7: Table.3 Derrick maximum stress values [MPa] Measuring point Stress amplitude Measuring point Stress amplitude 1 117.9 19 50.4 8 49.4 22 67.1 10 84.9 25 64.5 15 76.4 31 67.1 Analyze in each segment derrick measuring point maximum stress curve is not difficult to find: nine storms environmental load significantly affect the capacity of derrick operation, which the measured points 22 have the greatest influence by environmental load, minimum stress -33MPa, the maximum stress-67.1MPa, the stress difference 34.1MPa, accounting for 50.8% of the maximum stress value.

Static Characteristics Research of Bed with Three-Point Support Using Bionics Hao Zhang1, a, Yiguang Shi 2, b 1School of Mechanical Engineering, Tianjin University, Tianjin, China, 300072 2School of Mechanical Engineering, Tianjin University, Tianjin, China, 300072 azhanghao_ya@163.com, bsyg17@163.com Keywords: three-point support, unit structure, bionics, static characteristics, FEM Abstract.
The layout of the inter ribs of the bed is an important factor affecting its deformation.
Therefore, it is necessary to make further research of its statics property under gravity.
According to Saint-Venant principle, parts of the local features are simplified without affecting the results, and it is imported into the finite element software to analyze.
Dynamic and static performance optimization design of the mechanical structure based on the finite element analysis.

Therefore, the issue of investigating and modernizing mechanical, physical and technological properties of steels remains highly relevant [1].
The introduction of hydrogen into the structure of austenitic stainless steel affects their properties in a multifaceted way.
Currently, the question of changing the properties of steels under operating conditions at low temperatures is very relevant.
Hydrogen introduced into metal can radically change its properties.
One of the factors that reduces the energy of the steel packaging defects and contributes to phase transitions is the test temperature.

In detail, the research shows the final experimental results, related to the residual mechanical performance of pultruded samples subject to induced aging.
The aT is a basic property of a particular material.
At the end of the various tests, Strain Gauges [Fig.11] with a size of 60 mm were applied to all the specimens, a resistance of 120 ± 0.3, a measurement factor of 2.12 ± 1%.
Conclusion The research shows the final experimental results, related to the residual mechanical performances of pultruded samples subject to induced aging.
[4] Liao Kin, Carl R Schultheisz, and Donald L Hunston, Effects of Environmental Aging on the Properties of Pultruded GFRP (1998)

Introduction A difficult problem in the penetration into a concrete target is a proper understanding of friction properties between the projectile surface and the target.
But there is still a heat-affected zone from the observation on the remaining projectile after the experiment.
The heat conversion factor in Fig.4 and Fig.5 is different.
This coefficient is related to many factors, such as hardness, strength of projectile, target and so on.
Advances in Mechanical Engineering, (2012), pp.1-9

Agarwal2, b 1Research Scholar, Mechanical Engineering Department, Malaviya National Institute of Technology, Jaipur, Rajasthan, India. 2Mechanical Engineering Department, Malaviya National Institute of Technology, Jaipur, Rajasthan, India.
The various input process parameters in this work are wheel speed (RPM), duty factor, current (ampere) and pulse on-time (µs).
Introduction Titanium and its alloys were extensively used in many applications (especially in aerospace, medical, marine and surgical implants etc.) because these have excellent properties such as exceptional corrosion resistance, high strength to weight ratio and high temperature strength.
Table 1: Various input parameters, their levels & Formula for calculate the MRR Symbol Control Factor Level 1 Level 2 Level 3 Formula for calculate the MRR I Current (Ampere) 1 5 9 Ton Pulse-on-time () 100 150 200 S Speed (RPM) 350 550 750 DF Duty Factor 0.61 0.69 0.77 Where, & is initial & final weight of workpiece in gram (before & after machining respectively); is machining time in minutes.
It is observed through ANOVA analysis that the contribution of various factors are (Ton= 58.8 %), (I = 16.28 %), (S = 10 %) and (DF = 14.93 %) for the responses under the multiple criterion optimization (maximization of MRR and minimization of Ra) in EDDSG of Ti-6Al-4V.

In thermal and mechanical analysis of this study, many factors such as the actual element birth and death, the flow of the liquid in the weld pool, the strain history of the weld metal were taken into account.
Based on the accurate calculation of other factors, phase transformation was considered through setting the thermal strain depending on temperature.
The material data of thermal physical properties and mechanical properties referred to Eurocode 3 [8].
Weld and base metal were assumed to have the same composition and properties.
On the effect of welding thermal cycle, the HAZ has uneven microstructure and properties.