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Expansion property is of great significance to engineering.
On the one hand, expansion rock has strong expansion performance, when it is disturbed by something, especially by water, its properties will change dramatically and its volume increases.
China is one of the countries with most widely distributed expansion rock in the world, because of the special engineering properties, research on expansion rock and its engineering disaster has important significance to engineering [1-3].
In fact, water has physical, chemical and mechanical effect on rocks.
The constitutive equation of rock considering humidity field For humidity field loading problems, constitutive relation affected by humidity, elastoplastic and other factors should be taken into consideration.

Near Infrared Spectroscopy (NIRS) technique was used to predict the physical-mechanical properties (HEIN et al., 2010).
Barros filho (2009) compared two process for bagasse obtaining and concluded that such factors do not significant influence the quality of panels.
However, such properties were affected by increase of candeia wood in the panels.
Opposite results were obtained for mechanical properties.
Estimation of physical and mechanical properties of agro-based particleboards by near infrared spectroscopy.

However, the designer reduces the structural cost without taking into account uncertainties concerning material properties, geometric dimension and loading.
In Deterministic Design Optimization (DDO), the system safety may be taken into account by assigning safety factors to certain structural parameters.
Suitable geometry, material properties and loads are assumed, and an analysis is then performed to provide a detailed behavior of the structure.
Low reliability level: when choosing small values of safety factors or bad distribution of these factors, the structural reliability level may be too low to be admissible.
In the structural analysis of engineering design, there exist uncertainties in loading, material properties, geometry, and environmental conditions.

Such a processing of pure metals and alloys usually results in well-developed deformation structures, involving nanocrystalline (NC) structures, and could accompanied by enhancement of their strength, as also of a number (balance) of physical and mechanical properties [18-21].
Microalloying of aluminum alloys with rare earth or transition metals was discovered as an effective method to control their microstructure and properties [24].
Two main factors caused formation of such a structure.
Thus, factors determining aluminum alloys corrosion behavior, are commonly divided on structural and phase ones.
The effect of cryorolling was conditioned by synergy effect of factors mentioned above.

However, even small differences of the initial parameters can affect the result.
The sheet metal strip is drawn by a mechanical gripper.
The geometric properties were tolerated with +/0.1 mm.
However, the existing difference may be caused by various other factors.
The results show that tool life is significantly affected by the prevailing load.

Optimization of DVG850 Dual-screw Worktable System Based on ANSYS Workbench Jiang-miao Yi, Dong-qiang Gao, Fei Zhang, Huan Lin Institute of Mechanical & Electrical, Shaanxi University of Science & Technology Xi’an 710021, China Yijm0911@163.com 429089504@qq.com Keywords: worktable system, dual-screw transmission, ANSYS, modal analysis Abstract.
In traditional single-screw worktable system, the system is always subjected with torque because the driving force and force-bearing point of the workpiece always change with the processing path, so its performance may be affected.
So performance of machine may be affected.
When the finite element modeling of worktable system of the DVG850 high-speed vertical machining center is established, main load bearing parts are retained their original structure and shape and some non-load bearing parts are simplified based on reflecting their mechanical properties.
The comparison graph is shown in figure 2 The main factor to affect the dynamic characteristics of the worktable system is the low-order natural frequency of the worktable system.

Therefore the independent intellectual property rights on the key parts’ assembly technology, the overall engine assembly technology and the bench test system design technology of the high-power low-speed marine diesel engine are formed to improve the technical level of the China's marine main engine industry.
Assembly of Intake and Exhaust System and Timing Adjustment of Valve The valve timing is one of the key factors that affect the intake process of the low-speed marine diesel engine, and directly affects the whole power, economy and emission performance.
That brings about the significant differences in the cylinders’ performance and affects the overall performance.
The disadvantage is that the actual working conditions have the cylinder pressure to affect the valve opening process, and the valve timing in turning the camshaft at a low-speed differs from the one in the actual working condition.
After analyzing the diesel engine vibration, the shock-absorbing structure is applied to avoid the test platform’s resonance caused by the mechanical vibration of the diesel engine.

It is a complex of all principles of technique, economy and environmental harmony. 3.1 The Technique Principle of Material Selection Material technique includes physical properties, mechanics properties and chemical properties.
Physical properties include density and electrothermal conductivity.
Chemical properties include oxidation resistance and corrosion resistance.
The quantificational mechanical property muster of material is φ.
The mechanical property constraint conditions are shown in formula (8).

The fracture properties are controlled by the growth and coalescence of voids [1].
The displacement field designated by mode I stress intensity factor is applied on nodes far field from the crack tip. 2. 1.
The modeling is carried out with properties of measured values of matrix (AS resin) (E = 3710 MPa, � = 0.35).
The rubber particle's properties were assumed by initial tensile modulus E = 1.2984 MPa [10].
It can be seen from Fig. 6 that, the octahedral stress greatly reduces affected by debonding condition significantly.

But the characteristic of vibration is repetitive loading, so parts are easy caused fatigue and ageing, especially for mechanical insurance is more serious.
The inertial force and duration of the internal impact when the fuze fall down, depend on factors such as the projectile weight, packing method, height and surface properties and so on.
For the fuze safety and arming system, impact parameters that affect safety and arming system mainly include impact acceleration peak value and duration.
And the main influence factors for fuze MEMS pressure sensor are high temperature and recoil.Projectile recoil has larger spread according to different weapons.
Take circular diaphragm for example to study the fundamental frequency influence factors.