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In this part, the simulation of this bridge was sequentially used to analyze the influence produced by structure parameters changing on its mechanical performance.
The cross-sectional properties of two types of girder were same that has the width of 43.5m and height of 4m.
The uniform load was 10.5kN/m, the concentrated load was 360kN, the transverse reduction factor was 0.93, and the eccentric coefficient was 1.15.
The longitudinal deformation of girder in midspan was not affected by changing of tower stiffness.
But the longitudinal deformation of girder was not affected by changing of tower stiffness.

Surface integrity can be influenced by mechanical, metallurgical, chemical and geometrical changes that can limit a component quality.
As an example, fatigue life is significantly influenced by surface [4]; the fatigue life of a machined component is affected by its roughness and superficial mechanical alterations, namely residual stresses, microcracks and white layer.
Superficial strain hardening induced by machining processes is another feature affecting the surface integrity of a component.
These figures are not always unfavorable, under some conditions surface alterations may lead to increased mechanical properties [5,6].
Another interesting aspect related to the surface integrity is the tool wear; in particular, a correlation between tool wear and superficial properties, evaluated in terms of superficial strain hardening and surface roughness, was studied by some authors [15-18].

Mechanical properties: The monotonic mechanical properties of the analyzed materials are summarized in Table 3, encompassing results from instrumented micro-indentation (IT), tensile testing (T) and 3-point bending experiments (3-PB).
Monotonic mechanical properties of the materials analyzed in the present study, listed as average and standard deviation.
Li, A multi-component AlCrFe2Ni2 alloy with excellent mechanical properties, Mater.
Hecht, The Influence of Mo Additions on the Microstructure and Mechanical Properties of AlCrFe2Ni2 Medium Entropy Alloys, Front.
Schijve, Fatigue Properties, in: J.

The obtained results suggest the ceramic coating on Ti-6Al-4V alloy improved its creep resistance Introduction Ti-6Al-4V alloy is one of the mostly used titanium alloys in aeronautical and biomedical applications because of its excellent combination of mechanical, toughness, corrosion resistance, and chemical stability properties [1-2].
However, the affinity by oxygen is one of main factors that limit its application as structural material at high temperatures.
The development of titanium alloys with the objective of improving the creep properties have been observed, although the surface oxidation limits the use of these alloys in temperatures up to 600°C [4].
In recent works was verified the increasing of the superficial properties of the alloy through the PIII nitrogen treatment [5-7] and ceramic coating [8-12].
Occurred a decreasing of steady state creep in function of the reduction of oxidation process, showing that for the Ti-6Al-4V alloy their life time was strongly affected by the superficial treatment that was submitted because the oxidation suffered by the material.

Combination of chemical hydride hydrogen generation system with low-temperature PEMFCs Ay Su1,a, Hsiu-Lu Chiang2,b*, Zhen-Ming Huang1,c 1 Department of Mechanical Engineering, Yuan Ze University, Taoyuan 320, Taiwan 2 Department of Mechanical Engineering, Taoyuan Innovation Institute of Technology, No. 414, Sec. 3, Chung Shang E.
The physical properties of the Ru/Ni catalyst prepared were identified by a Field-emission Scanning Electron Microscopy (FE-SEM), and the surface elements were analyzed chemically with the Energy Dispersive X-ray (EDS).
However, the viscosity of solution will increase if the concentration is over, thus, the HG rate will be affected and slow down.
The factors affect the HG rate of solution flow rate maybe the period of catalyst contact with the solution is not long enough, so, the hydrogen cannot release completely and exhausted out from the reactor with the solution.
The residual flow returning to the tank may consist of hydrogen property.

However, on the one hand, this method is mainly affected by the accuracy of processing machine tool.
It has become one of the most important factors affecting the machining accuracy and the main obstacle to improve the machining accuracy, especially in the machining field of the high accuracy precision and ultra-precision.
Servo system is an automatic control system that takes the mechanical position or angle as the control object.
China Mechanical Engineering. 1998, 9(12): 48-52 [10] G.
Chinese Journal of Mechanical Engineering. vol. 42(2006), p. 201-205

Based on the experiments of four connections with widened beam flange section which included two arc widened beam flange connections and two welded side-plate connections specimens and one ordinary connection under cyclic loading, 3-D nonlinear finite element models were created by using ANSYS software to analyze the mechanical properties of these two types of widened beam flange connections, such as skeleton curve, ultimate load, ductility and failure mode etc.
Taking correspondent dot of 0.85Pu in the descending phase of skeleton curve as ultimate point, ultimate load and ductility factor μ of all specimens are derived from the skeleton curve and are listed in table 2.
Table2 Comparison of calculating value and test value of bearing capacity and ductility specimen Ultimate load Pu(kN) Ductility factor μ Calculating value Test value Error (%) Calculating value Test value Error (%) WF-1 WF-2 SP-1 SP-2 NBF 135.72 130.34 139.48 133.17 118.00 141.85 138.65 157.95 153.73 149.75 4.5 6.4 13.2 15.4 26.3 4.04 4.18 3.68 3.89 2.9 4.13 4.17 3.75 4.00 2.27 2.2 0.2 1.9 2.8 21.7 From the table 2, we can see that except for the NBF specimen, the others have small error between finite element calculating value and test value.
At the same time, the part lies in the weld heat-affecting zone, so the descending of the material behavior will lead to brittle crack at this location, the failure pattern of the welded side-plate connection changes from local buckling of beam flange and web to brittle fracture at the end of the widened beam flange.

The actual penetration test on the cylinder for on-board storage of fuel for automotive vehicle is taken for example to make a comparison with the design method and validate correctness and reliability of the designed test methods; corresponding failure fracture is analyzed through a scanning electron microscope to validate the affect of the penetration test on safety performance of the seamless gas cylinder and predict the possible results under actual working conditions.
Fig.4 Microstructure of the Fig.5 Microstructure of the Core Section of the Bullet Hole of the Cylinder Shell Material To strengthen illustration, an untested gas cylinder is selected for metallurgical analysis, with the same sample preparation conditions and enlargement factor as those mentioned above, as shown in Fig. 6, displaying an organization of sorbite.
Fig. 6, Microstructure of the Untested Gas Cylinder Through comparison, we know that high-speed penetration of the bullet causes burning at the fracture instantaneously and then a hardened layer is formed after air oxidation of the fracture material; material of the cylinder shell is not affected for high-speed penetration of the bullet; internal metallurgical structure of the cylinder shell material remains unchanged in spite of the bullet impact test, therefore, mechanical property of the cylinder shell will not be affected; meantime, the bullet impact test does not affect structure of the cylinder shell and nor make the gas cylinder burst upon an external impact force.

Materials such as titanium alloys, carbon-based composites, and various types of stainless steels offer the required properties, with their ability to resist corrosion and thermomechanical cycling being an important aspect [1].
Studies have shown that the application of thin nitride-based coatings significantly improves the thermal and mechanical resistance of shock absorbers [3].
This information is then used to design new solutions with better properties [5].
In these simulations, Finite Element Method (FEM) analysis is used to investigate in detail the mechanical and thermal stresses in different parts of the damper [5].
The decibel scale is an exponential measurement, and a noise reduction of just 10 decibels equates to a factor of 10 less energy to the ears.

The use of S/N ratio factor response chart can identify important control factors having more significant effect on S/N ratio, while the use of quality characteristics factor response chart can find out important control factors having more significant effect on quality characteristics.
In the level settings of experimental factors, adopted a 5-level design.
Because the total number of experimental control factors of this study is 5, and each factor has 5 level values, so selected L25(56).
Conclusions Injection molding parameter settings will be affected by production costs.
International Journal of Mechanical and Materials Engineering , 6(1) , 81-91