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The natural frequency is one of its properties which have no relationship with external condition.
Beijing, Mechanical Industry Press, 2010.
China Mechanical Engineering.
China Mechanical Engineering.
China Mechanical Engineering.

This nickel steel alloy also displays exceptionally high yield, tensile, and creep-rupture properties at high temperatures.
It was found that in gas tungsten arc (GTA) welds, Al + Ti content affects post-weld heat treatment (PWHT) or heat-affected zone (HAZ) cracking susceptibility.
Fatigue fracture modes are shown to be strong functions of stress intensity factor range DK or Kmax, [4].
Chemical composition and mechanical properties of both base metals are shown in Tables 1 and 2.
Table 1: Chemical composition of the alloys in wt. % Ni Cr Al Co Fe Mo Nb Ti Inconel 718 52 18 0.5 0.8 17 3.1 5.2 0.9 René 41 52 19 1.6 11 3 9.75 --- 3.15 Table 2: Mechanical properties Rm (MPa) Rm at 650oC Rp0.2 Rp0.2 at 650oC Elongation El. at 650oC Area reduction HV 10 Inconel 718 1375 1100 1100 980 25% 18% --- 445 René 41 1241 --- 793 --- 20% --- 25% 349 The Inconel 718 alloy was heat treated as follows: stress relief at 954 oC, for 1 hour, cooling to bellow 620 oC within 20 min, aging at 760 oC for 5 hrs, cooling to 650 oC.

Also the influence of kinetics and dispersiveness of Nb(C,N) precipitates on a complex of mechanical properties of steel during controlled rolling with accelerated cooling has been investigated.
Fig. 2 shows the schematic representation of dependences of mechanical properties of steel (0.05%C-1.4%Mn-Mo-Nb) from key parameters of TMCP technology.
The required level of mechanical properties of strip, including a uniform level of properties on length of a strip, can be achieved by maintenance of necessary phase structure of steel in a combination with the effective precipitation hardening of strip [1].
As a whole all the sb sb mentioned factors allow to predict the absence of susceptibility to cold cracks formation in HAZ metal at welding.
Products demonstrated the level of mechanical properties not lower than requirements of API X70 Grade.

Fig.1 Canning diagram of a wall surface Fig.2 Damaged of wall surface by rains Current research of rammed-earth materials Xingqing Pan experiments on adobe masonry the basic mechanical properties [1], then put forward the methods for improving the mechanical performance and earthquake-proofing of adobe structure.
The factors of influence soil shear strength are various [5-7].
The property index sampling is shown in Table 1.
Shear strength by two important parameters affecting by water content, cohesion(c) and internal friction angle (φ).
Indicators to determine the soil shear strength and its influencing factors [J].

This paper presents the results of vibro-mechanical treatment research, its influence on treated surface quality and working ability of the samples contact surface made by hardened steel ShKh-15, the nickel steel 40HNS2MA and bronze alloy BROF7-0,2.
Also the process conditions are summarized by: modes of vibration, characteristic of the process, coating technology and mechanical properties of the specimen.
The principle of the process depends on the properties of the work-piece, which is affected by the environment and mechanical behavior, or mechanical operation by the smallest particles, smoothing of its micro-roughness and plastic deformation of a superficial layer.
Babichev as a priority in study and is given by [1]: Vi,2 − (Ky0Vi,1)= (1+ Ky0 )A0ω cos(ωt), (1) Where: Vi,1, Vi,2 are the speeds of elements at layer i before impact in i+1 pair layers; the restoration factor Ky at impact of the first layer at the bottom of the working chamber; A0 represents the first layer amplitude of fluctuations; and ω is the frequency at fluctuations of the bottom of the working chamber.
In terms of oil friction the result is as well as in the previous series of tests associated with good oil-retaining properties of the surface after treatment in an abrasive environment.

The paper had studied the property of corrosion resistance of AlCoCrTiNiCu_x high-entropy alloys by using the way of loss-weight.
Generally, there are a number of factors that could affect the corrosion resistance of metal material, in addition to the components of the materials, the factors of the medium in the environment, the temperature, the relative motion between the metal material and the surrounding medium and so on also have important relation[1-4].
The weight-loss method has been used to determine the corrosion resistance property of the AlCoCrTiNiCu_x high entropy alloy, Because of its simple operation, the test results are sensitive and effective, and the method is also very extensive.
The corrosion resistance mechanism of AlCoCrTiNiCu_x high entropy alloy in the mixed corrosion solution of 1 mol/L NaCl and 0.5 mol/L H2SO4 is as same as in the 1 mol/L NaCl solution and H2SO4 solution, which are all affected by the Cr, Ni, Ti and Cu elements.
Heilongjiang: Harbin Institute of Technology, 2007 [7] Anmin Li, Xiyan Zhang, Lelin Liu, Liangjie Zheng.Materials for Mechanical Engineering. 36(7), 2012,14-16.

The mechanical properties of the new material have been stated also.
On the basis of the physical mechanical properties of the polyurethane expanded material and its application in controlling the coal mine disaster, it is proposed that the material can be used to repair the building foundation cracked by ground fissures.
Still, other factors, such as surface water seepage, ground load and collapse of loess, can affect its movement.
In the 1970s and 1980s, most specialists accepted that ground fissures were a irresistible natural disaster, for its movement results from tectonic factor.
Excessive pumping ground water is a key factor of the movement of fissures. 2.

As the process relies on a mechanical interlock rather than fusion, it can be used for a wide range of advanced materials that are dissimilar, coated and hard to weld.
Lennon et al. have carried out shear tests on four types of mechanical connections, these are self-pierce riveting, press joining, pop riveting and self-tapping screws, with sheet thicknesses 1.0, 1.2, 1.6, 2.0mm.
Tang et al. proposed a method which consists of establishing baseline strength characteristics in the six degrees of freedom and modifying the baseline properties with coefficient factors that influence the performance of SPR processes [3].
The strength of the SPR joints is affected by a number of factors including substrate thickness and mechanical properties, direction of applied load, and the geometric configuration of the SPR tools.
The method of the COV For the common monomial multivariate function in the reliability-based mechanical design, the calculation may be simplified greatly by using the method of the COV.

Introduction Proper thermal management is needed in Proton Exchange Membrane Fuel Cell (PEMFC) as this factor can greatly affect the efficiency of the fuel cell performance itself [1].
Kandlikar and Lu [3] have reviewed thermal management issues in PEMFC and highlighted that two critical factors need to be considered in cooling design of PEMFC which are the low temperature range of 60°C to 80°C which required a relatively larger heat exchanger compared to internal combustion engine.
Apart from the improvement in mechanical devices of fuel cell, alternative solution is seen in coolant's heat transfer coefficient enhancement through addition of nanoparticles [5].
Figure 6 : Heat transfer rate comparison between nanofluids and base fluid Table 1 : Calculated thermo-physical properties Property Base (50:50) 0.1 % Al2O3 0.5 % Al2O3 m (kg/s) 0.0482 0.0483 0.0489 Cp (kJ/kg.K) 3.3076 3.2982 3.2609 The cooling rate, Q is then plotted against the load and similar trend as DT curve is observed as illustrated in Figure 5.
[10] ASHRAE, "2009 ASHRAE® Handbook Fundamentals," in Physical Properties of Secondary Coolants (Brines), ed, 2009

However, polycrystalline silicon is high hardness and brittleness, and tensile stress is much larger than its shear stress, in cutting, polishing and mechanical polishing machining technology process, the silicon material under shear stress and prone to breakage phenomenon, which affected production yield[1].
Therefore, in this paper single diamond particles sawing theory is aplied to study the removal process of polysilicon material, and views the machining of polysilicon materials as the process that single diamond abrasive affects on the surface.
The material in this region will be completely converted to be chips then be cut out, so that withstand pressure loads are the main factors affecting the cutting force, but its value is very small, not enough to form micro-crack.
(4) Withstand pressure loads are the main factors affecting the cutting force, but its value is very small, not enough to form micro-crack
References [1] Li,D.S., Yang, D.R. and Que,D.L., Monocrystalline silicon material mechanical performance research and progress, Materials science and Engineering.2000:100～104