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n Kεσ= (1) The material properties used in this study for steam generator tubes are listed in Table 1.
Generally the burst pressure from the plastic instability analysis is very sensitive to the material properties and element size and so on.
Table 1 Material properties of Inconel 600 for plastic instability analysis ysσ (MPa) utσ (MPa) K (MPa) ν n 261.0 652.0 2901.68 0.3 0.36 Second, the burst pressure is calculated for a damaged tube and the strength reduction factor is obtained from the following Eq. 2.
The discrepancy between experimental data is probably due to the differences in test methods and mechanical properties caused by different heat treatment and so on.
However the burst pressure for the Model 2 is not much affected by the increase of 2θ.

The objective is to determine basic mechanical properties of galvanized multiphase steel sheets with a thickness of 0.75, 0.80 and 0.85 mm by a single-axis tensile test, determine the effect of the punch-die gap on plastic phase depth [hv] expressed as the relation of hv to a0, and, finally, determine the effect of material properties of blanked sheet metal on blanked edge quality expressed as the relation of hv to a0.
Table 1 Chemical composition of experimental materials [%] Material C Mn P S Ti Si Al Cr Cu Ni M 0.004 0.415 0.042 0.004 0.037 0.1 0.035 0.031 0.011 0.017 T 0.204 1.683 0.018 0.003 0.009 0.2 1.73 0.055 0.028 0.018 Y, Z 0.02 0.25 0.02 0.02 0.3 Samples were taken for a tensile test to determine mechanical properties of the material under zero-, 45-, and 90-degree angle in relation to the direction of rolling.
Measured and calculated values of mechanical properties of experimental materials are shown in Table 2.
Therefore, its magnitude, regularity and stability become very important factors as the tool wears.
The experiment showed that, in the case of the tested sheet thicknesses, mechanical properties (yield strength, tensile strength, their ratio, and elongation) have no apparent effect on blanked edge quality, evaluated through the relation of hv to a0.

In thermo-mechanical affected zone, the change in grain size was not significant, however, large number of low angle grain boundaries were observed, which seems to be concerned with the formation of subgrains due to the development of dislocation cells.
The advantages of the solid-state FSW process also encompass better mechanical properties, low residual stress and deformation, weightsavings, and reduced occurrence of defects [1,2].
Microstructure evolution was observed at the three positions of weld zone (WZ), thermomechanically affected zone (TMAZ) and base metal (BM) as shown in Fig. 1.
The welding speed seems to be a decisive factor in determining the shape of TMAZ.
This result suggests that tool rotation rate is a decisive factor in determining the energy input rate from tool shoulder and probe to substrates.

Silicon carbide ceramics with its excellent physical and mechanical properties have become the preferred material for space large diameter mirror.
This damage will reduced material strength and affect the material life.
Choice of experimental factors are: spindle speed, feed rate and grinding depth and set up four level for each factor.
The maximum depth of sub-surface crack size directly affects the performance of the material.
Though the single factor experiment, research on the effect of subsurface quality with grinding parameter.

Because of the existence of high stress in the surrounding rock of deep roadway, the physical and mechanical properties of the surrounding rock to change, and the surrounding rock stress distribution is very different from the shallow, so the way of shallow roadway support is not suitable for deep roadway.
Deep soft-rock roadway support is a complex systems engineering, it should consider the different geological conditions, roadway scope of application, construction technology conditions, construction period and the cost and other factors to determine the optimal combined support program, if the special geological conditions encountered in the construction, it should be timely to improve the supporting program to meet the construction safety and ensure the quality.
Roadway which is in a high stress environment, especially in the region which tectonic activity is strong, the residual tectonic stress is large and the engineering properties of rock mass bad, the deep roadway gradual emergence of the mine pressure behavior strongly, roadway deformation big and difficult to maintain and other phenomena, it not only results in production efficiency and economic benefit decline, and causes some damage to property, even threaten the safety of staff’s life in the underground.
Qiao Weiguo and other scholars (2011)[4]based on results of mineral composition analysis, rock’s mechanical property test and geological mechanics test of the roadway surrounding rock in Tangkou Coal Mine buried at a depth of over 1000 meter, bolting-grouting combined support scheme was proposed to the support design of deep swelling soft-rock roadway under high stress.
Summary Deep soft-rock roadway support is a complex systems engineering, it should consider the different geological conditions, roadway scope of application, construction technology conditions, construction period and the cost and other factors to determine the optimal combined support program, if the special geological conditions encountered in the construction, it should be timely to improve the supporting program to meet the construction safety and ensure the quality.

In this study, two directional carbon fibers reinforced composites with carbon nanotubes as fillers were studied for the high frequency electromagnetic properties and mechanical properties.
The electromagnetic insulating properties were measured by micro strip line method in this study.
Electromagnetic interference shielding properties of composites were investigated in the frequency region of 0.3-6 GHz.
The EMI shielding efficiency of a composite material depends on many factors, including the filler's intrinsic conductivity, dielectric constant, and aspect ratio.
Fabricated CNTs Table 1 showed the properties of manufactured composites.

(a) Location (b) Constitution Fig.1 Photos of tou-kung Due to sorts of factors, constitution problems such as deformation, crack and so on always appear on tou-kung members, which affect aseismic performance of tou-kung.
Both problems reflect decrease of mechanical performance of tou-kung as a whole assemblage.
Fig.5 Decay of tou-kung member CAUSATION OF PROBLEMS By analysis it is found that factors responsible for aseismic constitution problems of tou-kung in the Forbidden City include as following: (1) Constitution characteristics: by constitution a tou-kung is assembled by layers of wooden members, which are connected among each other by wooden bolts, as shown in Fig.6.
Fig.6 Bolts of tou-kung (2) Material property: wood material properties relate closely to aseismic constitution problems of tou-kung.
Virtue of this method is that it affects little to appearance of tou-kung.

Abstract:The chatter caused by the inner factors of the machining system in the ultrasonic honing process would seriously affect the surface quality of combustion engine.
However, the machining quality of engine cylinder is seriously affected by self-excited vibration because of internal factors of the ultrasonic vibration processing system.
Xu [6] improved the processing property of the part surface by change workpiece speed from the grinding system stability theory, which also reducing the flutter amplitude.
Dynamic model of ultrasonic honing flutter system Dynamic mechanical model of ultrasonic honing force.
China Mechanical Engineering. 2002,(9): 727-730

The grey relational analysis of different semi-rigid pavement structure models fatigue properties are done based on the grey system theory to gain the key influence parameter on semi-rigid pavement structure fatigue performance.
Therefore, the influence of pavement structure parameters on the fatigue resistance properties of semi-rigid pavement structure is researched to provide the reference for the pavement structure design of improving semi-rigid base asphalt pavement fatigue performance for target.
D Calculating the gray relational degree The calculating formula of gray relational degree is Where: is the relational degree of curve and curve, sequence of relational degree which describe about the factors affecting the results.
The fatigue properties of pavement structure are analyzed under medium traffic conditions similar to the test road. the parameters of pavement structure are shown in table 1.
The thickness of semi-rigid base and modulus of each layer material are major influence factors in the semi-rigid pavement structure, therefore, construction quality assurance is necessary to achieve the required modulus value for each layer in the construction process.

In addtion, it is one of the main control factors to hydrocarbon migration, accumulation and preservation.
With the further understanding, Scherer et al.came to realize that there are many factors affecting strata porosity variation, and depth is just the more important one of factors[7-10].
Liu(2007) deduced porosity dual function, depth and time as variable factors, from the visco-elastic stress-strain mode(Bingham model) under the conditon of constant speed burial[14].
Characteristics and causes of sandstone porosity evolution The influence with sandstone reservoir properties always attributes to compaction, cementation and dissolution.
Quantitative researches would solve dynamic problems in hydrocarbon accumulation, and relate different accumulation factors with accumulation process organically.