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Acarer et al. [6] explained that the mechanical properties of heat treated specimens offered more tensile, shear and bending strength than unheated-treated ones.
The total DOF of the factors should be less than the DOF of the OA.
Welding factors and their levels Factors Unit Level 1 Level 2 Level 3 Level 4 Amplitude (A) µm 21 24 27 30 Weld Pressure (P) bar 2 2.6 3.2 3.8 Weld Time (T) sec 0.18 0.21 0.24 0.27 Fig. 4.
Conclusions In this present context, the process parameters affecting the welded joints have been studied during ultrasonic welding between A1100 and CuZn37 sheets.
Findik: The influence of some factors on steel/steel bonding quality on there characteristics of explosive welding joints, J.

It proves that steering wheel shimmy is a vibration of stable limit cycle occurring after Hopf bifurcation, which is elaborated by nonlinear dynamics theory, and the control objectives of shimmy are proposed according to its bifurcation properties.
If the shimmy system is linear, it loses its stability to be infinite divergent movement, in fact, vehicle system can not have such movement, so for the study of shimmy, the system nonlinear factors must be fully considered.
Because the influence factors of shimmy is very much, that causes the shimmy equation dimension may be very high.
By the kinematic properties of limit cycles, it can be concluded as follows: the shape, amplitude, frequency and other characteristics of the limit cycle are determined by the law of motion of the system and are not affected by the initial state or disturbances, which just shows that oscillation frequency is determined, which is not affected by the traffic impact.
The tire gramary equation is used in the model, in which nonlinear factors between cornering angle and cornering force are all considered.

These phases significantly differ each other in their mechanical, physical and chemical properties.
Fiber surface profile (specific surface area) is a factor that considerably affects wettability.
The specific surface area is the next significant aspect affecting many properties and it is variable with the fibre diameter that was also estimated during the analyse of SEM images taken by electron microscope Tescan Vega XMU.
This value is determined by chemical composition and morphological structure of both the matrix and the reinforced fillers and as all mechanical properties of composites it is affected by quality of interfacial phase [25].
On the other hand from the mechanical properties point of view the bigger surface area is preferred.

The mechanical properties and densities of the samples were measured; then the specimens were identified by XRD and the microstructure was observed by SEM.
The influence of sintering temperature and sintering time on the properties of the ceramic proppant was investigated and then the reaction mechanism was explained. 1.
Some mechanical and physical properties of the sample were measured.
Sintering temperature and holding time had a great influence on the properties of the ceramic product.
The dimensions of the particles, the number and composition of the liquid phrase as well as the number and the morphology of the pores will be directly affected by sintering temperature; then the properties of the ceramic proppant will be influenced by those above comprehensive factors.

Furthermore, an increase in porosity has proven to decrease the mechanical properties and increase the wear trace area and the friction coefficient of sintered steel. 1.
Practically the process is so effective because approximately 90% of steel parts are damaged owing to the lack of mechanical properties [6, 8].
The nitrogen species diffuse in combination with iron nd alloy elements to form nitrides that modify physical and mechanical properties of the surface of the alloys.
Nitriding is known to modify properties such as wear, fatigue and corrosion resistance, in addition to microhardness [11].
Magnetic properties of iron nitrides.

,LTD, Zibo 255200, China 3 School of Mechanical and Electrical Engineering, Hebei University of Engineering, Handan 056038, China adouxuanbo@163.com, blilisdwh@163.com, cwangxiangmin@163.com Keywords: 7A04 aluminium alloy, Xisha, corrosion Abstract.
Introduction Aluminum alloys, with low density, excellent mechanical properties, good processability, have been widely used in aerospace and other fields.
Accelerated test method design principles The design principles of accelerated test method are as follows: 1) Confirm the purposes of accelerated corrosion test methods, and establish a set of fixed experimental parameters. 2) Grasp the characteristics of the simulated environment and the environmental main factors affecting atmospheric corrosions.
The corrosion currents of 7A04 aluminum alloy in NaCl solutions with different concentrations measured, and the equivalent conversion factors are established as shown in Table 2.
Fig.1 The temperature - relative humidity - equivalent conversion factor surfaces（T- RH -α）of 7A04 aluminum alloy in Xisha ocean atmosphere Table 2 Conversion coefficients of NaCl solution with different concentration to water medium NaCl Concentration /% 0.25 0.5 1.0 3.0 5 7A04 0.665 0.631 0.468 0.153 0.112 Accordingly, the accelerated test method is established in the simulate Xisha solution with 5% NaCl, 0.25% Na2SO4 and 0.25% CaCl2, a experimental cycle in which is equivalent to the actual exposure to natural environment for one year.

The influence of this dynamic precipitation on creep properties is discussed.
Introduction Poor creep property at high temperatures is one of the factors to limit the extensive applications for magnesium alloys.
Other factors such as the segregation of primary alloying elements also affects the creep properties of magnesium alloys.
The annealing treatments like T4 treatment can effectively increase the creep properties.
This volume change seems to accelerate the growing of voids and is detrimental to the creep properties.

The model was based on equilibrium equations on which load-bearing capacity of R.C. column at given time (year) can be predicted considering the overall deteriorations of rebar, concrete section, mechanical properties and bond behavior between corroded reinforcement and concrete.
It not only reduces the bar section and the mechanical properties of reinforcement, but also generates concrete cracking and changes bond strength between reinforcement and concrete due to the expansion of corrosion products.
Synergistically, load-bearing capacity and mechanical behavior of RC elements are affected by the corrosion of reinforcement [1].
Generally speaking, the previous studies mainly concentrated on the mechanical properties of corroded members at a given time or given corrosion.
Few models consider the overall deteriorations of rebar and concrete section, materials mechanical properties and the relationship of bond-slip.

Simulation of fiber orientation in dumbbell-shaped injection cavity Hong He1, a, Xiongbing Chen1,b 1College of Mechanical and Electrical Engineering, Beijing University of Chemical and Technology, Beijing China Engineering Research Center of the Ministry of Education for Polymer Processing Equipment, Beijing China a,bemail hehong@mail.buct.edu.cn Keywords: fiber orientation, dumbbell-shaped cavity, simulation, injection Abstract.
Understanding rules of the distribution of fiber is important to control the mechanical properties of composite material performance.
The calculation results verified demonstrated that the shape of injection cavity affected the fiber orientation.
In order to get the desired the mechanical properties of the final composite product, understanding rules of the distribution of fibers in the flow field of injection molding process is very important.
The Governing Equation For isotropic flow field of thickness concentration suspension, the interaction between fibers and fiber rotary motion were considered in fibers orientation control equation, Fokker Planck equation: (3) Among them; is differential operator; ωij is vortex tensor; is tensor of deformation rate; λ is fiber shape factor, is fiber rotational diffusion coefficient, Ci is interaction coefficient between fibers.

This metal has a wide range of excellent mechanical properties which couldn’t find in any other alloy.
Since these designs are ratable, therefore, it required minimum 3 level of factors.
After run some preliminary test, the appropriate levels of factors were used to actual machining test.
Table I shows the level of factors to be design.
The chemical composition and physical properties of the workpiece material is shown in Table III and IV [14].