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There are so many factors affecting on vibration of vehicles, in that body structure is one of the main causes.
There are many factors that affect the vibration noise of cars, in which the structure of the body is one of the main causes.
The body of the car is mainly low carbon steel, because the low carbon steel properties are not much different, so the influence on the calculation results can be ignored.
The material properties are ​​used to build the finite element model are shown in Table 3.
Table 3 Properties of material in the model Parameter Elastic modulus Poisson coefficient Specific weight Value 2.06e5 [Mpa] 0.3 7.89e3 [kg/m3] Theoretical basis for solving individual oscillation problem The linear oscillation of a mechanical system is described by a sufficiently wide n-coordinate system (n degree of freedom).

The Swelling Properties of Nitrile Rubber with Different Acrylonitrile Contents in Cyclohexane Medium Research Huiming Wang1, a, Xiaoren Lv1, b and Shijie Wang1, c 1School of Mechanic Engineering, Shenyang University of Technology, Shenyang, China, 110870 awanghm118@126.com, bxrlvsut@126.com, c wang_shijie@263.net Keywords: Submersible screw pump; Nitrile rubber; Acrylonitrile content; Swelling properties; Mechanical properties.
By the research of swelling and mechanical properties of nitrile rubber with different acrylonitrile contents in cyclohexane medium, the influences of physical and mechanical properties with diffrent acrylonitrile contents is analyzed.
With different acrylonitrile contents and swilling times the nitrile rubber shows different mechanical properties.
（a） swelled NBR （b）dried NBR Fig.2 The Shore Hardness Change Rate Of Swelled And Dried Nbr In Different Soak Periods Mechanical Properties Tensile properties is one of the most important measure to the physical properties of rubber.
There are many factors can influence the rate of the permanent deformation such as rubber net structure between the molecules; molecular force; displacement between the molecules and so on.

Keywords: Silicon nitride, Pore morphology, Mechanical properties, Permeability.
The mechanical properties were investigated.
Cordierite was done for this purpose due to the low thermal expansion coefficient resulting in good thermal shock resistance, but its mechanical properties are not well.
Silicon carbide is also a candidate due to the high mechanical properties at high temperatures, however, the thermal shock resistance was poor.
As the pore size is the key factor for affecting the flexural strength, increasing the porosity by the increasing whisker content only increase the amount of the fracture origin, but not its size.

The effect of cold work after solution treatment, aging parameters (time and temperature) on the microstructure and mechanical properties were studied.
These designs are designated 2k-p where k is the number of factors which may be evaluated in a full factorial design of size 2k, and p is the number of extra factors to be included [6].
So good mechanical properties can be obtained by a combination of plastic deformation and thermal treatment.
An understanding of these parameters would help in selecting the metallurgical conditions required to achieve the optimum mechanical properties.
Optimum mechanical properties (strength and ductility) can be attained for TMT specimens aged at 170C for 10 hours with cold work of 50% reduction.

Then orthogonal simulation test was carried out to research the influence factors for the grinding forces and temperature distribution.
The orthogonal simulation test was conducted to research the influence factors for the grinding forces and temperature distribution.
Fig. 2 Geometrical model and dimension of the abrasive-grain Dynamic mechanical property of steel.
AISI 1045 steel is a medium carbon steel and characterized by good weld ability, good machinability, high strength and high impact properties.
As its high performance price ratio and good mechanical properties, Johnson-Cook (JC) model is used to describe the dynamic mechanical property in the simulation of single grit cutting process.

Flexibility is an important mechanical property of stent.
With the emergence of biodegradable materials [2], for a stent that is given in its structure, factors that affect the stent flexibility not only include the materials of stent, but also include the work status of stent, such as crimping status during delivery, supporting status after expansion of stent and so on.
More and more attention is paid to the flexibility of stent by domestic and abroad researchers since it is one of the important mechanical properties of stent.
The general mechanical properties of this material are as follows [10]: Yang’s modulus, 200 GPa; Poisson’s ratio, 0.35; tangent modulus, 1 GPa; yield strength, 315 MPa.
The mechanical properties of biodegradable pure iron are as follows [11]: Yang’s modulus, 211 GPa; Poisson’s ratio, 0.3; yield strength, 130 MPa; tangent modulus, 470 MPa.

Confined-accelerated Creep Tests to Determine the Creep Reduction Factor Zhen Zhang1, Duoyi zhu, Tengfei Chen, Tao Wang 1School of Civil Engineering at Central South University,410075,Changsha Keywords: Creep, Time-Temperature Superposition Principle, Geogrids, Confined and Accelerated Creep Tests, Master Curves Abstrct: The creep characteristics of geogrids is one of the most important factors affecting its permanent in reinforced soil structures. currently, most of the creep tests are under unconfined conditions, the results deviates significantly from the real status in the application .
Theoretical background Elevated temperatures can accelerate chemical and physical process,it is also applicable to the creep properties of materials.The essence of time-temperature superposition principle is to accelerate creep properties at elevated temperatures .
Concrete creep environmental factors control room is used to control the test’s temperature , humidity and other conditions.
Figure 2 The proposed design of slope reinforcement The design of geogrids must consider four strength reduction factors:reliability of production stability(), environment-microbe - pH effects(), mechanical damage when laying in different filler(),connecting strength damage caused by joint effect().
[3] ANG Dong,Study on Confined Creep Properties of Geogrids. .2012.5

With the application of the mass scaling factor technique, the full history of spinning process is performed successfully.
Theoretical foundations The mechanical equilibrium.
The coupled thermo-mechanical problems.
In the coupled thermal-mechanical analysis, both of mechanical equilibrium and thermal equilibrium must be satisfied.
And the properties of temperature dependent material should not be neglected.

The recent investigation have shown that the accurately selected heat thermal cycles can guarantee the acceptable mechanical properties of heat affected zone (HAZ) of high strength as well as ultra-high strength steels [4,5].
The temperature-time cycles during welding have a significant effect on the mechanical properties of a welded joint.
These factors have a positive effect on the mechanical properties that may reach the level typical for base metals.
Their mechanical properties are shown in Tables 1.
Mechanical properties of S690QL and S960QL steels Mechanical properties Steel S690QL [MPa] S960QL [MPa] Rm [MPa] 850 1065 Re [MPa] 720 1010 A5 [%] 16 14 Table 2.

Introduction Poly(vinylidene fluoride) (PVDF) is a semi-crystalline polymer with a variety of interesting properties.
Mechanical properties of the nanocomposites were evaluated according to ASTM D-638.
The mechanical properties and creep resistance of nanocomposites were tested according to ASTM D-638 (type V).
The improvement is attributed to two factors.
[10] Ward, IM 1983, Mechanical Properties of Solid Polymers, JohnWiley and Sons Ltd., Weinheim.