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Introduction We started by the realization of a database containing mechanical properties of aluminium alloys at different temperatures, which are the principal data to be introduced to the numerical code [2].
- Then, a second step of calculating the stress intensity factor
The line segments located on either side of the diagonal correspond to an error on the fatigue lifetimes by a factor of two.
The crack growth is considered in this work under mode I loading, which is the most dangerous to the integrity of mechanical structures.
Differences between numerical and experimental results are affected by several parameters, we can mention: the assumptions made in the formulation of algorithms, the inaccuracy of the experimental determination of some specific parameters in the predictive model.

The same actuators such as ball screws have the same mechanical and electronic parameters.
Mathematical modeling of two-axis synchronization control system When analyzing the feed drive system of an unique axis, the friction of the servo motor and the viscous damping factor are ignored to reduce the complexity of the system model.
Fig.1 Two-axis synchronization control model Fig.2 Two-axis synchronization control simulation model Due to the little affect on the system, the friction of the servo motor and the viscous damping factor are ignored.
According to the mechanical characteristics, the maximum jerk is set to 4m/s3,the maximum accelation is set to 4m/s2 ,the maximum velecity is to 10000 pulse/s that is 10m/min,and velecity is set as trapezoid.
Properties of Fuzzy Systems, WSEAS Transactions On Systems, Issue 2, Vol. 8, Feb. 2009, pp. 210-228

With the development of industrial production, the requirement that materials with higher corrosion resistance, wear resistance, magnetic properties and hardness, chemical plating Ni-P alloys often can not meet the requirement.
The transition metal W is the preferred choice of the materials because of high melting temperature and unusual mechanical properties.
Many investigations have been reported on the effects of heating on the properties of electroless Ni-P deposits[8-10], but few of them have been reported concerning the behaviour of electroless Ni-W-P deposits and conflicting results on electroless Ni-W-P deposits are reported in literature[11].
Experimental procedure The H12 aluminium alloy was chosen as the substrate owing to its cost, convenience and basic mechanical strength.
The main factors which influence to hardness of coating had the crystal size, dislocation density and impurities.

Introduction Carbon nanotubes has been widely known to own unique properties such as good mechanical strength and high conductivity.
Since then, this materials become attraction due low density properties but exceptional thermal properties [1].
For CNT films and fibers in macroscale, their mechanical strength and electrical properties is decreasing tremendously compared to nanoscale.
The design of the reactor also plays an important role in the synthesis process as it involves thermopherosis and residence time affecting the growth of CNT film.
Sun, Effective enhancement of the mechanical properties of macroscopic single-walled carbon nanotube fibers by pressure treatment.

Antibacterial Properties of Guided Bone Regeneration Membrane for Periodontal Applications N.
This study aims to assess antibacterial properties of recently developed three-layered poly(lactic-co-glycolic acid) (PLGA) /lauric acid (LA) composite membrane towards Staphylococcus aureus.
This membrane holds promise for antimicrobial properties against Staphylococcus aureus, the most commonly found bacteria in nosocomial infections.
Song, “Novel starch/chitosan blending membrane: Antibacterial, permeable and mechanical properties,” Carbohydrate Polymers, vol. 78, no. 1, pp. 146-150, Aug. 2009
Genco, “Clinical, microbiological, and histological factors which influence the success of regenerative periodontal therapy.,” Journal of periodontology, vol. 65, no. 2. pp. 154-61, Feb-1994

However, there are many process factors needed to control when using the transistor welding power and reliable welded joint demanding special process, especially with the welding of coating and dissimilar materials which because of their properties varied widely and the coating metal may participate in the metallurgical reaction of nugget.
Table .1 Factor level of orthogonal experiment Level No Factor A Preheat current/KA B Welding current/KA C Tardy rise time/ms D Preheat time/ms E Cool time/ms F Welding time/ms G Electrode pressure/N 1 0.4 2.3 0.5 2 1 5 20 2 0.6 2.9 0.4 1.5 0.5 3.5 45 3 0.8 3.5 0.3 1 0 2 68 In table 2, the important order of the factors that affect the conversion are welding current, electrode pressure, welding time, preheating current, tardy rise time, preheating time, cool time in turn.
The Influence of Factors on Welding Joint’s Tension Shear Force.
The influence of level change of factors on experimental index is also different.
[4] Resistance welding speciality committee(Ⅲ) of welding society in Chinese mechanical engineeringsociety.

In addition, its mechanical strength, electrical properties, resistance to radiation, oxidation, corrosion, flame and excellent performance.
Select products must be considered filler performance, molding process and the cost of several factors.
The sheet was not a good dielectric strength and low thermal conductivity, also has good bending properties.
To do in the glass filler system, the glass can have good acid resistance and to improve its electrical properties.
Quartz powder has a lower thermal expansion and good electrical insulation properties, can improve the dimensional stability and thermal conductivity products, and improve the dielectric properties.

The geometry of such jets is an important factor for fluidic jet determination.
There is a great difference in mixing properties of normal and fluidic jets, which as illustrated in Fig. 1.
Different geometrical factors such as the jet nozzle exit width, feedback channel width, oscillator depth, and the oscillating chamber shape can affect the performance of fluidic nozzles.
This is because of the fact that by removing the outer nozzle, the factor creating fluidic self-excited flow has been eliminated.
The flow entrainment ratio is less than one in the self-excited machines and it is more than one in mechanical excited jet.

Washing water consumption of the process is high, separation of fat and black liquor is not complete, and affects the quality of refined cotton.
Refined cotton has mainly two difference characteristics with nitrocellulose: 1) its fiber length is 1-4mm, more than the latter; 2) The former has good hydrophilic and good adsorption properties, and the latter do not dissolve in water.
The most important factors of dewatering influence of refined cotton are: ① slurry concentration, feed concentration of refined cotton is too low (2-5%), On the one hand, may be too thin because of the formation of the cake without the cake discharged from the drum, in the other hand, the so-called "over the limit overflow" phenomenon, for this reason, the slurry is required pre-separation before entering the centrifugal concentration. the method is slurry pass through the settlement wall screen, filter out some fresh water, the slurry concentration is about 10%; ② separation factor Fr, separation factor is proportional with the square of the speed drum and diameter, the greater the separation factor, the greater the filtration driving force, the faster the filtrate through.
Ensuring the piston can push, separation factor increases, more conducive to refined cotton dehydration.
The right of Eq.2 is a constant, it determined by the slurry properties and the sieve.

Yecong HE[8], based on the enthalpy model of phase change material wallboard room,the factors influencing the heat transfer performance of the wallboard were analyzed.
Fatty acid Temperature of phase change:20˚C-90˚C Melting heat is about the same as the paraffin's Better melting and solidifying properties, reversible melting and solidifying process, stable chemical property, no super-cooling, no phase separation, innocuous, cheap, small volume change as phase changing and large latent heat.
So it is much cheaper than the mechanical ventilation and the air conditioning related devices.
Moreover, it do not need any power and mechanical energy but a little If it adopts a automatic control system.
However the mechanical ventilation and the air conditioning system consume amount of power.