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Except for the peaks of Mg (JCPDS No. 35-821), new peaks were also detected at 2θ=21.8°, 28.1° and 42.3°, revealing the presence of HA coatings on the Mg substrate after being dipped into the HA sol (data of samples M33-HA and M35-HA were not given).
The reduction in icorr from 4.48 to 0.03 μA·cm-2 reveals that the corrosion resistance of Mg alloys was significantly improved.

Empirical expressions are derived to relate the linear and nonlinear critical stagnation pressures under wind for practical use. 2 Wind pressures on cylindrical shells A wind tunnel studied by Macdonald in the late 1980s provided the extensive wind data that Rotter [7] used to devise a much better pattern of wind pressures for the silo, which depends on the aspects ratio of the silo and is adopted in EN 1993-4-1 Annex C [8] as Fig.2 shows.
As the cylinder length increases further (), the pre-buckling path become more nonlinear (Fig. 3), with stronger pre-buckling flattening on the windward generator, leading to a more significant reduction in the axial buckling resistance.

. (- - experimental data; ___ numerical results).
From these analyses, both the introduction of cavities in the bulb geometry and the decreasing of yield stress of the lead alloy can determine an useful stiffness reduction in order to concentrate the damage in the bulb-keel zone.

In particular, it is to improve the ductility and toughness, which is higher than carbon steel strength.[4] Not only ductile iron has more than the mechanical properties of gray cast iron, and ductile iron also has a number of advantages of gray cast iron, such as good casting performance, friction reduction, cutting and low notch sensitivity, and even in some respects it can be comparable with the forged steel, such as fatigue strength is broadly in line with the medium carbon steel.
Through the finite element analysis of the structure, we can set up corresponding relations with the real objects and supply the experience data in future.

Reduction of feed speed to 0.25 mm/cog and depth of the cut to 1.0 mm is improves surface quality insignificantly and surface defects is significant.
A large spread in experimental data, depending on the roughness of the tool material can be used to explain the different nature of the wear of the cutting edge during milling.

Analyze calculating data, we can draw the conclusion that preliminary draw size is fixed, the relationship between maximum horizontal displacement and heap load distance in a fixed heap load is: （3） the relationship between maximum stress and heap load distance is: （4） —the distance between the heap load and the pile, 2.3 Analyze the influence of composite foundation pile stiffness The calculated result shows that the change of the pile composite foundation modulus has little effect on the mechanics behavior of composite foundation by soil sway preliminary, in a fixed heap load and distance, the maximum horizontal displacement of the pile and the soil still occurs in 0.4 L ~ 0.6 L from the ground, the bigger pile modulus generating hinder role is similar with the smaller pile, for the CFG pile strength grade is C15 ~ C25, the elastic model is similar, reinforcement of CFG pile mainly bears axial load. 2.4 Analyze the size of cushion
Through the above calculation analysis, considering the main factors that affect the mechanical properties of the CFG piles by the soil lateral displacement which is due to the heap load, such as the size and the operating range of the heap load (Q&D), the compression modulus of the soil (Es), and the relationship between the maximum horizontal displacement maximum pile stress, and those main factors can be summarized as following relationship: (5) (6) 2) When the heaped load exists, the stress and deformation of the composite foundation occur mainly in the range of 0.4L ~ 0.6L (L is the length of the pile) below ground; 3) When the heaped load exists, the pile that nearest to the heap load will bear most soil pressure which is produced by the soil lateral deformation, about 30% ~ 45%; 4) Due to the barrier effect of piles, the lateral deformation of the strengthening area soil will be much smaller than the lateral deformation of the heap load area soil, reduction

Experimental data and results analysis Table 1 Breaking strength under initial conditions Breaking strength(N) 1 2 3 4 5 Average Maximum Minimum Anhui 33.22 33.71 32.43 34.29 33.32 33.39 34.29 32.43 Boda 32.60 31.78 32.07 32.10 33.35 32.38 33.35 31.78 Tianshun 33.50 33.68 31.90 35.02 33.59 33.54 35.02 31.90 Yingsiruide 35.93 33.92 35.38 36.32 34.51 35.21 36.32 33.92 From table 1,four PTFE bag’s sew lines’ strength are at about 33N and have reached the bag suture strength technical conditions required to Chinese environmental protection products in the identification of more than 27N.
Figure 2 Breaking strength comparison under different temperatures heating 24h Conclusions Based on the PTFE suture tensile strength test on condition that at the initial normal temperature, 160℃, 180℃,200℃ of four sample factories respectively heating heating 10min and 24h, we can make the following conclusions: 1 High temperature working state at the same heating time , with the increasing of temperature, the PTFE suture strength will reduce gradually, the reduction is great at 160℃, but becomes more and more unobvious with temperature increases.When the temperature exceeds a certain value, the breaking strength reaches a fixed value, but suture in this state can't be used as the bag suture any more. 2 In the same heating time,PTFE suture strength will reduce gradually,but the difference is small between 160℃ and 180℃, and almost has no difference with normal temperature .

Point data reduction using 3D grids, Advanced Manufacturing Technology[J], Vol.18, Num.3, 2001,8

Through to macro analysis of bolt fracture, find the fracture smooth, without strength reduction, the surrounding of fracture smooth, the particles of Intermediate fracture organization is coarse.
Washington: Proceedings of the ACM SIGMOD International Conference Management of Data(1993),.p.1017 [3] Agrawal R., Srikant R..

(2) where is the spatial frequency; ; is the distance interval between successive ordinates of the surface profile; N is the number of data points, and is a set of independent random phase angle uniformly distributed between 0 and 2π.
The writer simulate the damage in the deck surfacing crack as a reduction in the Young’s modulus of material, and the following function is proposed (0≤≤100%, j=1,2,…m)