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PTFE maintain excellent mechanical properties at wide temperature range -196 ～ 260 ℃.Its chemical corrosion resistance and weatherability are good, except molten alkali metals, PTFE almost resistants any chemical corrosion.
Bag’s sew line is one of the factors which influences the broken bag in the filter property.So, before the bag puts into use, tension strength test should be done on the bag’s sew line .
When using different filter materials in line, it must be superior in the tested line in strong, heat resistant, chemical resistant and thermal expansion properties to that of the same filter material .
But testing after the line was heated at 180℃ for 24h, its strength has little change, the heating time has little influence on the properties of the suture, but the work state has great influence on the performance .
The temperature above 200℃ will make large changes in properties of the suture. 3 Tensile strength values drop much in the heating conditions of the 10min, but in 24h after heating and cooling to room temperature conditions strong values changes unobvious .

Forskitt et al. [4] used the Finite Element Method (FEM) to obtain the dynamic properties, namely Young’s modulus and Poisson’s ratio of a perforate.
These properties are then used to calculate the natural frequencies of the perforated panel.
As previous models concern with only the dynamic properties, this paper investigates the change of vibration level due to the introduction of holes into a solid panel.
Hill, Effective bending properties for stress analysis of rectangular tubesheets, J.
Brook, Elastic properties of plates perforated by elliptical holes, Appl.

These factors will affect or stimulate the normal tissue impacting on long-term success rate of implant [9].
They found that the corrosion resistance property of porous metal was the same with the substrate.
Biological properties of acid etched titanium implants: effect of sandblasting on bone anchorage[J].
Study actuality of corrosion, mechanical compatibility and biocompatibility of titanium alloys for medical application[J].
The study on properties of surfaces of titanium implants treated by different roughing methods[D].

Factors to be considered for Fast Pyrolysis Process.
This situation creates char deposited on top of the bed which eventually affect the yields and chemical properties of the vapour product.
From Table 2, it can be concluded that the bio-oil properties are significantly different with the other fuel properties, thus the bio-oil cannot be used directly in engines and energy appliances.
Fuel and chemical properties of bio-oil and conventional liquid fuels.  
One of the ways of improving the fuel properties of bio-oil is by using catalytic process.

The effect of equal-channel angular pressing on structure-phase changes and superplastic properties of Al-Mg-Li alloy.
At the same time, it is possible that changes in the phase composition occurred during SPD and this may also affect the superplastic properties of the materials [2,7].
At higher deformation temperatures the ECAP alloy demonstrates more increased superplastic properties than the initial one.
Naidenkin, Grain boundary diffusion and properties of nanostructured materials. ( Novosibirsk: Nauka, 2001)
Golovin, Mechanical spectroscopy of metal materials.

The notches were formed in the middle of the gage length to obtain stress concentration factors ranging from 2.55 to 13.34.
These values are associated, respectively, with the following stress concentration factors calculated with FE models: 13.34, 6.63, 3.10 and 2.55.
Stress concentration factors of 2.55, 3.10, 6.63 and 13.34 were investigated.
Collings: Materials Properties Handbook: Titanium Alloys (ASM International, US 1994)
Conference on the Mechanical Behavior of Materials (2011)

It is difficult or impossible for a bulk monolithic material to possess all the above-mentioned properties while combining with required bulk mechanical properties [3].
Preliminary experiments have revealed that the physical properties of such composites depend to a large degree on the properties of performs [7,8], while the tribological properties are based on squeezing the lubricant phase out, which leads to the formation of a surface film protecting the friction surfaces against seizure and scoring (self-lubrication effect) [9].
The object of this research was to investigate the synthesis and characterization of HSS-based self-lubrication composites which possessed the appropriate morphology and mechanical and tribological properties.
It can be seen that the porosity increased approximately linearly with increasing PFA content and was affected by the variation in χ, as shown in Fig. 2 (a).
The proportion χ constitutes a limiting factor on the ratio of open porosity to total porosity, and the maximum occurs at χ = 2:3.

With regard to the crankshafts of different materials, we can modify the size of the material properties parameters to calculate the stress value of each node, which are in the macro file efr_run.
The entire model is meshed into a total of 158,331 elements after the 3D model is imported into ANSYS for meshing and defined the cell types and material properties.
Then the three macro files cal_crank.mac, efr_run.mac and plot.mac are called to complete the crankshaft strength analysis process, and the stress state and safety factors of each node are got.
By analyzing the stress value and the safety factors of all output nodes, the positions of the connecting rod journal fillet and the main journal transition fillet, as well as the vicinity of connecting rod journal oil hole exist higher level stress.
[3] Meng Zhang: CATIA for Mechanical Structure Design (Mechanical Industry Press, China 2006).

During start-up of a hydrotronic system under thermal shock conditions elements of hydraulic components warm up in a non-uniform way, due to varying material and shape properties.
Determination of the Clearance Height in Cooperating Elements of Hydraulic Components During Start-up under Thermal Shock Conditions [4, 5] During start-up of a hydraulic system under thermal shock conditions elements of hydraulic components warm up in a non-uniform way due to varying material and shape properties.
The changes of clearance magnitude between cooperating elements of hydraulic components during actuation of device in aforementioned conditions depend on many factors, i.e.: load, ambient and oil temperatures, oil flow rate.
It is possible to evaluate the effective clearance during start-up period (τ) of the frozen component, on the basis of equation: )()()( ττ τ t pm e llll ∆−∆+= (1) Oil pressure affects both movable and immovable elements of the hydraulic component and generates deformation.
Jasiński: Methods of determination of correct operation area for hydraulic component in low ambient temperatures, Developments in Mechanical Engineering, vol. 2, Gdańsk (2008) [4] R.

The phenomenon depends on many factors [5] such as the composition of the atmosphere, the operating temperature or the presence of vibrations.
Encountered situations are often unique, with random phenomena, and multiple factors are involved [16].
As a future work, mechanical tests will allow us to evaluate this potential.
Effect of Temperature on Thermal and Mechanical Properties of Steel Bolts.
Stress concentration factors within bolt-nut connectors under elasto-plastic deformation.