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Study on straw liquefied product synthetizing polyurethane elastomer Shengli Zhao 1,a, Zhenhua Xue1,b , Yabin Li 1,c , Jintian Huang1,d* （Material Science and Art Designing College, Inner Mongolia Agricultural University, Hohhot 010018） a zhaoshengli11@163.com, b x_zhenhua@126.com ,c liyabin2258@163.com, d jintian_h@163.com Key words: Straw, Liquefied product, polyurethane elastomer Abstract: In order to take full advantage of straw liquefied product to make the best mechanical properties of polyurethane synthesis.
The results showed that: curing agent is 3% (1:33), the initial reaction temperature is 40 °C, curing time is 8h, the mechanical properties were the best.
The author conduct a research on corn stover liquefaction by using butanol under ordinary pressure, and analysis the impact of various factors to find the best liquefaction process which provide a theoretical basis for straw liquefaction industrial.
Test arrangement was shown in Table 1: Table1 Orthogonal Test Design Order numbers factors MOCA% Initial reaction temperature(°C) curing time (h) 1 2.0 30 6 2 2.0 40 8 3 2.0 50 10 4 2.5 30 8 5 2.5 40 10 6 2.5 50 6 7 3.0 30 10 8 3.0 40 6 9 3.0 50 8 Properties of Polyurethane Determination of mechanical properties (Reference GB/T1040-92) XRD measurement and analysis The theory of X-ray diffraction measurement method is based on the comparison between the total scattering intensity of the atoms in crystalline region and amorphous region of polymer and the scattering intensity of the atoms in crystalline region, using X-ray diffraction polyurethane elastomer powder for analysis.Voltage of XRD-6000 diffractometer: 40.0 (kV)，Divergence slit: 1.00000 (deg)，Scattering slit: 1.0000(deg)，Receiving slit: 0.30000 (mm) , Scanning range: 3.000-40.000，Scanning speed: 3.0000 (deg/min)，Sample spacing: 0.0800 (deg) Result and Analysis Mechanical Property Test Themechanical property of polyurethane
It can be perceived from figure 1, figure 2 and figure 3 that the influence of initial reaction temperature on mechanical properties is the greatest, the influence of vulcanizing time is less, and the influence of the dosage of MOCA is the least.

Force Analysis of the Middle Wall in Multi-arch Tunnel under Central Hole + CRD Method Li Jun, Wang Zong Lin School of Transportation Science and Engineering, Harbin Institute of Technology, Harbin 150090, China hitlij@yeah.net Keywords: Multi-arch Tunnel, Force Analysis, Middle Wall, Mechanical Properties Abstract. arch tunnel construction in the presence of construction mechanics often unclear, the lack of systematic design and construction of the theory can learn.
Harbin Clinic Road thesis double-arch tunnel project as the basis, the construction process through its hole + CRD using the finite element simulation analysis and on-site monitoring measurement data processing, engineering arch tunnel song used in the wall study the mechanical properties.
In subway construction, although open-cut construction method is most convenient, but in the bustling city traffic arteries, intensive commercial construction zone, due to traffic conditions, geographical conditions, open-cut construction can not be implemented, and the cover lid down construction dig dug along the building need traffic relief, to some extent, affect traffic.
Therefore, it is necessary to combine the mechanical properties of the actual project arch tunnel in the wall for further analysis, which is an important reference and guidance for total construction of double-arch tunnel.
The wall by the force process also closely related to geological factors and construction.

Some sheets were subsequently cold rolled 10–20% to compare the mechanical properties with those of the commercial strengthened grades.
Introduction Ultrafine-grained (UFG) materials have been studied extensively in laboratory tests due to their promising mechanical properties.
Sheet thickness affects slightly the self-cooling rate, but it was found that the mechanical properties are not sensitive to that.
The reversion annealing of 45CR sheets at 695°C followed by water quenching showed that the decrease in ts from 65 to 6 s did not affect the tensile properties.
Kyröläinen, Enhanced mechanical properties through reversion in metastable austenitic stainless steels, Metall.

Table1 Mechanical properties of fiber cement sheets [5].
Table2 Mechanical properties of EPS foam [7].
Table 3 Mechanical properties of GFRP sheets [9].
Poly Foam Industries Company Limited, THAILAND (2010) [7] The mechanical properties of the foam.
Chem Limited Partnership, Bangkok, Thailand (2010) [9] The mechanical properties of fiber glass related products.

Some properties of handling, steering feel and ride-comfort of a passenger vehicle are affected by the tribological performance of the ball joint [1].
It is reported that the friction characteristic of ball joints can be changed by modifying the parameters that affect the friction behavior of ball joints, such as mechanical properties of friction materials, the compositions of lubricants, and temperature [4-7].
Orthogonal Experimental Method The influencing factors, including contact area, normal pressure, roughness, and velocity have been determined with the specific level of each factor according to the experimental conditions and the actual working condition of ball joints.
Experiments show that the area of the curve is affected by factors such as normal pressure and lubricant viscosity.
Evaluation of Tribological Properties of Polymer Materials Used for Sliding Bearings in Agricultural Machinery [J].

This paper deals with an overview on the effect of factors on the property in very high cycle fatigue regime.
However, it is reported that some factors, such as load frequency, surface treatment, environments, et al., have the effect on the VHCF properties.
In this paper, some experiments and theoretical analysis results about the effects of various factors on VHCF properties are introduced in recent years, which include the load frequency, surface treatment, environments, strength and microstructure and so on.
Xue, Very high cycle fatigue properties for aluminum alloys.
Gigacycle fatigue in mechanical practice.

The effects of MnO2 on 3Ce-ZrO2 studied in comparative to the undoped Ce-ZrO2 in terms of mechanical properties and retarding the degradation.
Evaluation of mechanical and physical properties is also evaluated comparing the values with regular sample in weight versus duration.
Many factors found to be the determiner for ageing behaviour of ceria zirconia ceramics such as powder processing techniques, sintering conditions and grain size .
According to Hoque et al [25,26], Other factors such as processing variables also found to be closely related in determining the property of ceramic.
[11] Kuwajima H, Kobayashi K, Masaki T 1981 Phase change and mechanical properties of Zirconia- yttria solid electrolyte after ageing , Solid State ionic 800 489-95

Influencing factors.
Three major factors affecting the quality of brazed joint are listed in Table 1.
The material properties of filler metal were provided by JMatPro® .
Quality brazed structure can be obtained by selecting optimized influencing factors.
Guo of JmatPro ® for providing the material properties of BNi-x filler metal.

Good mechanical properties: The mechanical properties play a decisive role in the performance of interface, including strength, toughness, precision, etc.
In the above factors, inner hole and outside circle of fixture head are machined under an installation, so that D5 is very small and can be ignored.
But the random errors of steel shaft are related with the uneven material of steel shaft and other random factors in the process of free-fall, which are comparatively difficult to control.
In conclusion, in factors influencing steel shaft pre-position, the biggest factor is the random errors of steel shaft in the process of free-fall.
Its overall structure has following characters such as simple structure, reliable and stable connection, and good mechanical properties, etc.

Introduction Aluminium (Al) and its alloys are widely used conventional engineering materials due to their lightness, relatively good mechanical, electrical, and thermal properties, and low cost.
Some properties of the pure Al, the Al-CNT-nSiC and the Al-CNT-nD composite materials.
Thus, it is possible to fabricate multifunctional materials with properties that have been customised by the application of the FGM concept.
Agarwal, An analysis of the factors affecting strengthening in carbon nanotube reinforced aluminum composites, Carbon (2011) 533-544
Lanka, Effect of carbon nanotube (CNT) content on the mechanical properties of CNT-reinforced aluminum composites, Compo.