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In this article, we focused on changes of mechanical properties in lining of tunnel caused by loess cavity.
For loess tunnel, its lining plays a crucial role.Therefore, analysis changes of mechanical properties of lining of the tunnels in Huangtu Regions taking account of loess cavity is very importent.
We focused on changes of mechanical properties in tunnel's lining caused by loess cavity.
Cavity changed the mechanical properties of the lining.
Through the analysis, we found that different locations, size of the cavity and depth of the tunnel are the main factors affecting the mechanical properties of the lining, and the larger the cavity, the greater the depth of the tunnel, and the lower location of the cavity, the greater the mechanical effects of the cavities on the lining of the tunnel.

Lack of this understanding and a set of reliable structure-property relationships are currently the major factors impeding wider applications of this class of composites.
In presenting this initial data, no attempt has yet been made to censor the data based on the factors mentioned in the preceding paragraph that may adversely affect the mechanical properties.
Further analyses of the raw data are underway to refine and compare the properties of the twelve types of specimens with factors that influence the results in the background.
Factors that affect the properties are identified for further data reduction and analyses.
Through these studies, it has become clear that many factors affect the mechanical properties ranging from preform and composite fabrication through testing and rational data reduction.

School of Life science and Engineering of Southwest Jiaotong University, Chengdu 610031 a xfl615@163.com; bsanpolincoln@163.com; c wangjelly1@163.com; dwujinjin19850616@163.com; e 15950592340@163.com ; f zhouchenghoujiayou@163.com; g xmwang991011@163.com Keywords: orthogonal design; 6N01 aluminum alloy; mechanical properties; microstructure Abstract: In this study, we designed four components of 6N01 aluminum alloy by orthogonal design, and analyzed the effect of the different elements for the mechanical properties and microstructure of the designed material after casting, homogenization annealing, extrusion treatment and natural aging.
But through research and literature review we found that what they provided is so wide, and the material properties is not stable enough, failed to reach the optimal level.
With Mg, Si as the factor 1, Mn as a factor 2, Cr as a factor 3, the content of three factors designed to two levels, as shown in Table 1-1.
Mechanical Properties Four different components of the aluminum alloy 6082 tensile strength, yield strength, elongation, bending and impact toughness properties as shown in Table 3.
Tab. 3 Mechanical test results of 6082 aluminum alloys No. σb/MPa σs/MPa L/% Bending performance 1# 264.50 248.41 10.43 Qualified 2# 234.87 210.97 10.67 Qualified 3# 290.07 275.67 8.4 Qualified 4# 309.24 300.80 6.23 Qualified Tab. 4 The range analysis of the effect of different element on the mechanical properties 　 Tensile strength Yield strength Elongation rate 　 A(Mg,Si) B(Mn) C(Cr) A(Mg,Si) B(Mn) C(Cr) A(Mg,Si) B(Mn) C(Cr) K1 499.37 554.57 573.74 459.38 524.08 549.21 21.1 18.83 16.66 K2 599.31 544.11 524.94 576.47 511.77 486.64 14.63 16.9 19.07 R 99.94 10.46 48.8 117.09 12.31 62.57 6.47 1.93 2.41 Filter the results Screening protocols： A2B1C1 Factors： A>C>B The material： 6N01S-4 Screening protocols：A2B1C1 Factors： A>C>B The material：6N01S-4 Screening protocols： B1C2 Factors：A>C>B The material：6N01S-2 From the screening results, we can draw, the final selection of the material is the6N01S-2 and 6N01S-4, but 6N01S-2 tensile strength is not enough, so removed from

Factors affecting PTFE membrane pore structure and mechanical properties were investigated.
Spinning parameters of PTFE/PVA primary hollow fibers with different PTFE/PVA mass ratios Hollow fiber ID Before sintering Primary-1 Primary-2 Primary-3 Primary-4 Mass ratio of PTFE/carrier 1/1 3/1 5/1 7/1 Characterization The mechanical properties of as-spun hollow fiber membranes were conducted by an Instron tensiometer (Model YG061-1500).
Results and discussion Mechanical property Effects of PTFE/carrier mass ratio on the mechanical property of primary hollow fiber were shown in Fig.1.
Furthermore, Fig.2 illustrated the effect of sintering state on membrane mechanical property.
Some properties of hydrophobic membranes for distillation.

The influence of factors, including different raw material ratio, drying temperature, concentration of glycerol and degassing time, on properties of chitosan edible film was studied.
Properties of film affected by temperature.
Properties of film affected by glycerol.
Conclusion and prospect This experiment studied the factors affecting chitosan film making.
Therefore, the factors on films property during film making are needed to do more in-depth research.

The main influence factor of the attrition rate of the TBM cutter is rock abrastivity.
(2)Many factors affect the wear value of rocks, mainly related to the nature of the rock itself .there are the mineral composition of rocks, mineral hardness, particle shape and size of mineral particles link between power, rock joint fracture of the degree of development, degree of weathering, the rock itself, in which the integrity and stress environment.
Nature of the rocks themselves is also the factors that affect the physical and mechanical indexes of rock directly, and are the most important factor.
The higher the value of physical and mechanical properties of rock, the greater of the rock abrasion value .Instead, the content of the lower hardness of the rock minerals (such as biotitic, muscovite, calcite, chlorite, etc.) was higher, the lower of the rock physical and mechanical properties value, and the value of the rock abrasion is smaller
(3)Genetic types of rocks, rock environment, structural types as well as the testing conditions (including the loading frequency, the choice of surface scratches, scratches rate, and needle measurement error) are factors affecting the rock abrasion value, need to be further studied.

The constitutive relation of closed-cell foam rubber is established by the overlay analysis of the two impact factors.
Based on the above three factors, the closed cell foam rubber material in the linear elastic stage’s compression stage-strain relationship is as follows:
Conclusion Based on Gibson-Ashby microstructure model and hyperelastic mechanical properties of solid rubber, we have studied the effect that the closed-cell foam rubber pore structure and matrix material to the mechanical behavior.
References [1] L.J.Gibson,M.F.Ashby,Cellular Solids: Structure and Properties (Beijing,Tsinghua University Press,2003)
[2] HU Wen-jun,CHEN Hong,et al,Effect of Porosity on Properties of Open Cell Silicone Rubber Foam Materials, China rubber industry.1998,45:647~650

These microstructural features of the harmonic structure materials lead to unique mechanical properties.
These results suggest that the MM at both RT and CT have affected the powder interior and its internal processing affects the post-sintering microstructure formation and changes in mechanical properties.
The microstructural difference in MM at RT and CT significantly affects the mechanical properties and the strength of the compact of MM powder milled for 86.4 ks at CT is higher than that at RT.
Relationships between microstructure factors and MM times at room and cryogenic temperature.
Ameyama, Effects of Microstructure on Mechanical Properties of Harmonic Structure Designed Pure Ni, J.

Firstly the microstructure and mechanical properties of forged Ti-6Al-4V welded joints was focused on.
Mechanical properties of welded joints were investigated using macro-mechanical tests and microscopic observation.
The shape and distribution of β phase, α phase and α’phase are considered important factors for affecting mechanical properties of joints[5].
Therefore different microstructure of the base metal, the HAZ and the weld zone decides differences of mechanical properties of all regions.
Microstructure and Mechanical Properties in Weld Heat Affected Zone Of Titanium Alloy [J].

The physical and mechanical properties of rice-straw boards were shown in table 2.
Effect of technological factors on fire-retardant properties.
Taking the impact of MDI, UF and FRW on mechanical property and fire retardant properties of boards into consideration, factors optimizing were obtained according to the result of variance analysis.
Table2 showed that the physical and mechanical properties of rice-straw boards with FRW satisfied the national standard GB/T4897.3-2003, so the improvement of fire retardant property became the keypoint of factors optimizing.
And the physical and mechanical properties of rice-straw boards compressed with MDI and UF improved obviously.