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This method considers dependent failure of the parts, material strength degradation with increasing load times and uncertainty of load times in micro and macro scopes to explore main factors affecting the system reliability.
As a result , material properties of each gear parts, torques and load times play key parts in reliability of the system. 1 Introduction Reliability analysis and assessment of automobile transmission contributes to developing the transmissions with long life, to cutting down energy consuming, to improving working reliability.
In this paper, a system reliability assessment calculation model is built considering comprehensive factors. 2 Establishment of reliability model of automobile transmission system In order to build system reliability model , firstly structure and working principle of transmission need to be understood.
[9] Lili,Liyang Xie,Xuehong He.Strength Degradation Law of Metallicmaterial[J],Journal of Mechanical Strength,2010,32(6):967-971
[15] Zhili Sun, Xingju Leng, Yangang Wei.Mechanical Design[M],Shengyang:Northeastern University Press,2000 [16] Hongfei Wang,Chengfan, Luyong Sun.

The results of tests also showed that the mechanical properties decrease when used rubbers as aggregates.
The utilization of tires rubber negatively affected the hardened properties of SCC but improved ductility.
The decrease and increase in tensile strength of cylinders were caused by the same factors that influenced compressive strength.
Increasing the pores lead to decrease the mechanical properties of this sample.
ElGawady, Mechanical properties of high strength concrete with scrap tire rubber, Construction and Build.

Then the mechanics properties and stress distribution in working condition for the original connection fit are calculated and analyzed.
Introduction The work environment of aviation pipe connection fit is extremely complex and rigorous, which will be damaged under the comprehensive influence of complex stress, vibration, hydraulic shock and temperature, thus affecting the reliability of aviation product[1].
The pipe connection fit is in mechanics a mechanical connection component with multi-body and multi-contact with complicated contact state and mechanics properties.
There needs to improve the structure to reduce the maximum stress and gain a better mechanics properties.
Meanwhile, the mechanics properties of the improved connect fit were obtained by the FEM analysis.

However, material defects can reduce physical and mechanical properties, such as hot tearing defects [4,5].
Differences in metal properties will affect to the HAZ area (heat affected zone), TMAZ (thermomechanically affected zone), and WM (weld metal) regions [11].
The variation of shoulder rotation in the FSW process is one of the determining factors for improving weld quality.
This study conducted a numerical study of mechanical properties (hardness and tensile strength).
Based on Figure 11(a) to Figure 11(b), the tensile strength of FSW weld metal has a significant decrease in the mechanical properties compared to the base metal mechanical properties.

Technical science defines a lot of different factors, that they may be cause of shorter cutting tool lifetime.
For increase cutting tool durability is necessary maximally possible elimination of these factors.
Material for workpieces is from specific material list with guaranteed chemical structure and mechanical properties.
Mechanical properties of C45 Mechanical properties of C45 Re [MPa] Rm [MPa] A5 [%] HB E [GPa] min. 305 min. 530 16 max. 225 221 These experiments were made under defined technological conditions.
Testing properties of those materials are very important, because their properties may be different than properties defined in standards ISO.

The tensile properties of TRIP steel at room temperature were also measured.
In addition, the properties of TRIP steel were markedly decreased because martensite, which was deleterious to the ductility, was present in microstructure of the steel soaking at bainitic temperature 350for 6 mins.
In present work, Gleeble3500 thermal simulation testing machine, Nikon330 optical microscopy, X-350A X-ray stress instrument and CMT5305 electronic universal testing machine are used to study the effect of heat treatment on microstructure and mechanical properties of TRIP steel containing aluminium.
Yield strength was mainly affected by bainite with higher strength and hardness.
The properties of TRIP steel were markedly decreased because martensite, which was deleterious to the ductility, was present in microstructure of the steel soaking at bainitic temperature 350.

Effect of friction stir processing on mechanical properties of surface composite of Cu reinforced with Cr particles Bahram A.Khiyavi1,a, Abdolhossein Jalali Aghchai2,b, Mohammadreza Arbabtafti1,c, Mohammad Kazem Besharati Givi3,d, Jalal Jafari3,e 1Department of Mechanical Engineering, Faculty of Mechanical Engineering, Shahid Rajaee Teacher Training University, Tehran, P.
Microstructures, microhardness and wear properties have been studied in order to evaluate the microstructures and mechanical properties of fabricated composites. the microstructure properties are evaluated by optical microscopy (OM) and field emission scanning electron microscopy (FESEM).
Good microstructual and mechanical properties (hardness and mechanical strength) were obtained [12].
Barmouz used FSP to modify microstructural and mechanical properties of pure copper and also Cu-based SiCp reinforced surface composite.
Investigation of mechanical properties of Cu/SiC composite fabricated by FSP: Effect of SiC particles’ size and volume fraction.

And then, a probabilistic model is established for the scattered effect factors on fatigue lives.
Mechanical properties are around 188 GPa for Young's modulus, 254 MPa 0.2% proof strength, 453 MPa ultimate tensile strength, 26 % elongation, and 45 % reduction of area.
Affecting Factor.
Average and standard Aeff-KN relations of the present effect factors are exhibited in Fig. 3.
Their fatigue properties are compared with the properties of material specimens.

Effects of the pH value of addition stage, the pH value and the temperature of polycondensation stage on the properties of the resin were analyzed.
In the synthesis of urea-formaldehyde resin adhesive, the pH of the addition stage, the pH and temperature of polycondensation stage are important factors that affect the resin synthesis, while it plays a decisive role in the structure of the main product of the various stages, quality and performance of resins [2].
In this paper, above factors are studied on the basis of improvements of urea-formaldehyde resin formulation[3], the optimum process are selected, the free formaldehyde content are further reduce.
Instrument: 6511 electric mixer LND-1 paint-4 coating viscometer Y33-50 500KN hot press, MWD-50 Mechanical Tester.
Each factor was taken three levels and L9 (34) orthogonal scheme was used for the test.

Experiment Chemical composition and properties of the water atomization iron powder are showed in Table 1.
Affecting Factors in Warm Compaction.
There are many factors affecting warm compaction.
The orthogonal test result show that the degree of influential sequence of the 5 factors on the compact density from high to low is: A>D>B>E>C.
Ejection force is related to compacting pressure, powder properties, density and dimension of compact, mould design and lubricant's properties etc.