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There are many factors influencing main structure of the tunnel concrete durability, mainly displays in the following aspects.
Material levels Material durability research mainly start from factors that influencing the durability of structure, and analyzes the failure mechanism under the action of single factor or more factors, to establish the durability damage prediction model and empirical formula, realize process from the qualitative analysis to quantitative analysis.
Structural concrete permeability of nondestructive testing Permeability is one of the basic properties of porous materials; it reflects the material internal pore size, quantity, distribution and connectivity and so on.
Wall height is the main factor affecting wall stress.
First it is necessary to develop a system to improve a set of strengthening quick test method，so to be able to compare objectively reflect the concrete destruction in the use of environmental factors and their cross composite factors, and to long-term exposure tests by each other.

Thus, this study represents the research in how ultraviolet exposure affects the physical properties of wood that has been pre-treated thermally, followed by obtaining a composite.
Oksman, Processing of wood chip-plastic composites: effect on wood particle size, microstructure and mechanical properties, Journal Plastics, Rubber and Composites. 40(2) (2011) 46-56
Kelley, Effect of hemicellulose extraction on physical and mechanical properties and mold susceptibility of flakeboard, J.
Kazemi-Najafi Influence of hydrothermal modification of fibers on some physical and mechanical properties of medium density fiberboard (MDF), J.
Kelley, Effect of hemicellulose extraction on physical and mechanical properties and mold susceptibility of flakeboard, J.

Temuujin et al. in his paper suggested that CaO will improve mechanical properties of geopolymers [26].
This may be due to the CaO content that affects the mechanical properties of the geopolymer materials.
Geopolymer chemistry and properties.
Alkali activation of metakaolins: parameters affecting mechanical, structural and microstructural properties.
Influence of calcium compounds on the mechanical properties of fly ash geopolymer pastes.

High-strength steel is a type of alloy steel that provides better mechanical properties or greater resistance to corrosion than carbon steel.
Strip shape is an important factor affecting the strip quality significantly for the rolled products.
Because of the complex influence factors of plate shape and profile, shape detection and control technology have not been solved, especially for high strength steel rolling.
Most mechanical and physical properties and boundary conditions are temperature related.
Table 2 shows the material property parameters of work roll and backup roll.

It has been suggested that Sn-based solder such as SAC305 causes variations in mechanical properties due to the anisotropy of Sn [3, 4].
Polycrystallization may counteract anisotropy, reduce variations in mechanical properties and improve the joint life.
Tensile Properties.
Fig. 8 Schmidt factors of specimens with maximum and minimum tensile strength of SAC305 at 233 K
Suga, Mechanical properties of lead-free solder alloys evaluated by miniature size specimen, Proc. of SPIE 5852 (2005) 297-301

Introduction Sapphire is an alumina single crystal, also called corundum; it has excellent mechanical and physical properties, such as high hardness, high tensile strength, erosion resistance, thermal conductivity, mechanical stability and remarkable thermal impact properties.
During operation, you should avoid all possible interference factors; the tiny mechanical vibrations of equipment will greatly affect the quality of crystal.
A typical analysis process includes the following several steps: 1.creating/importing geometry model, 2.defining unit and material properties attribute, 3.meshing, 4.applying load, 5.solving and the processing with results[2].
The finite element model of key parts Static analysis of key parts The static stiffness of crystal furnace is determined by material, shape, size and many other factors, it is a very important indicator to measure the overall performance of equipment [5].
Journal of Mechanical Strength,2007,29(5):795-799

In the process of calculating reliability index, the factors such as size, assembly error, and space environment influence have been taken into consideration, and the method of MFOSM (Mean First Order Second Moment) has been applied.
The main influencing factors have been analyzed and the improvement has been put forward.
It directly affects the attitude stability of the mast expansion and even affects whether or not the satellite mission will be successful [4].
The Determination of the Probabilistic Properties of Velocities & Accelerations in Kinematic Chains with Uncertainty,Transactions of the ASME,1991,113(3):84-90
Harbin Institute of Technology, Mechanical design and theory,2009.

These results show that the electrical properties can be improved by control of the microstructures.
The electro-mechanical coupling factor and piezoelectric constant of NKN-5LT ceramics were improved in the samples with A-site ions excess NKN-5LT.
Electrical properties of K2O excess NKN-5LT ceramics.
These results show that the electrical properties can be improved by control of the microstructures.
The excellent piezoelectric and electromechanical properties in modified NKN-5LT ceramics indicate that this system is potentially good candidate as lead-free material for a wide range of electro-mechanical transducer applications.

Lukács1,c 1University of Miskolc, Department of Mechanical Technology.
During the analysis, the main factors considered were the stresses (mechanical, thermal and environmental) and loads, which have effect on cleaning pigs during its operation.
Another important factor is that we can avoid unnecessary costs by omitting unnecessary inspection activities [7].
These stresses or effects are as follows: Mechanical effects: 1. depends on the extent of the overlap → non-steady loads; 2. difference of pressure between the two sides → distributed load on surface; 3. bending moments affect on individual points of the disks → bending stress; 4. bending → shear stress; 5. on contact surface with the inner wall of the pipe → friction → torsion stress → tangential stress.
The investigated discs and calculation of the relative wear For the selection of the adequate cleaning disc of a cleaning pig for a given pipeline the following parameters should be considered: mechanical properties (especially hardness), diameter, thickness, geometry of the outer edge, material grade and operating temperature.

Small amounts of various alloying elements were added to a high strength Al-Zn-Mg-Cu alloy and their effects on the microstructure, mechanical properties, and casting characteristics were investigated.
Experimental To investigate the effects of alloying elements on the mechanical properties, plate-shaped castings (60x100x24mm) were fabricated in the metallic mold.
Solidification range that is known as an important factor affecting castability remained almost unchanged by Zr or RE additions.
Although there are various parameters affecting hot cracking phenomena in casting processes, two of the most important parameters should be the amount of last freezing liquid and the freezing range because the stress on the solidifying body has to be accommodated by a grain boundary displacement and this movement is facilitated by available liquid [4,6].
Tensile properties of heat-treated alloys Fig. 6.