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Whereas natural rubber has superior mechanical properties that are better than synthetic rubber.
The test results showed that the mass ratio of RSS/EPDM rubber affected the mechanical properties of the resulting rubber compound.
Ozone attack causes deterioration of natural rubber which affects the properties of natural rubber.
Mechanical Characteristics Rubber pneumatic fender application is subjected to environmental factors such as sunlight, oxygen, or high temperature.
Besides mechanical properties, aging also affected the duration time of the product.

Effects of Processing Factors on the Mechanical Properties of PBO Filament/ Epoxy Composite Materials Bin Wang 1,a, Zhihao Jin 1,b, Zheming Qiu 2, c and Anhua Liu 2,d 1 State Key Laboratory for Mechanical Behavior of Materials, Xi'an JiaoTong University, Xi'an, Shaanxi Province, 710049, P.
The purpose of this work is to investigate the influence of the wet-winding process factors on the mechanical properties of the PBO fiber reinforced epoxy composites.
Their properties are given in Table 1.
Table 1 Properties of raw materials Materials Tensile strength (MPa) Tensile modulus (GPa) Elongation at break(%) Density(g•c m -3) Linear density(g•m -1) PBO (AS) 5350 170 3.5 1.54 0.111 Matrix RX2 100 3.8 4.9 1.24 / Specimen preparation and Mechanical properties.
The penetration amount of epoxy and the properties of composite material according to penetration time of epoxy are equal to Fig2.

Results indicate that strength, young’s modulus and extensibility of CFRP sheets deteriorated owing to climatic factors.
An average value of aging residual strength semi-experienced math model is used to study time-dependent deterioration on fiber reinforced polymer affected by climatic factors of east China.
Studies of changes in the physical and mechanical properties of two common kinds of carbon fiber reinforced polymer (CFRP) sheets after 3 years of aging under climatic conditions of east China are reported.
Physical and mechanical properties are including appearance, tensile strength, elastic modulus, elongation. 2.
Statistical results of material properties.

Fig.1 Principle of hot stamping The product obtained after hot-stamping has a high mechanical strength, dimensional precision and mechanical properties, no rebound phenomenon.
Analysis of factors affecting the cooling effect And the cooling rate is a measure of the uniformity of the cooling effect of mold cooling indicators.
Cooling rate is an important factor affecting the process cycle and productivity; uneven cooling causes residual thermal stress within the product, affecting its mechanical properties and service life [5]. 1.
Conclusion In the hot stamping process, the raw material to complete the transformation from austenite to marten site organization, and therefore mold cooling effect directly affects the mechanical properties and dimensional accuracy of the product.
The analysis revealed: water flow rate, pipe diameter, spacing distance pipelines and pipe work-surface is a major factor affecting the mold cooling effect.

Study on the Influence Factors of Mechanical Properties of PPTA Fibers in Microscale Simulation Ying-Ying GAO1,a*, Shu-Hu,LI1,b, Jing-Li XU1,c, Hai-Yun ZHANG1,d, Yan LIU1,e, Guo-Wei LIANG1,f, Kui-Yuan SUN1,g 1Shandong Non-metallic Materials Institute, Jinan 250031, China a2365770027@qq.com, bshuhu_li02@1663.com, c94418853@qq.com, d1013057379@qq.com, eliuyan3024@163.com, f18742017200@1266.com, gsky17865316261@163.com Keywords: Poly (p-phenylene terephthalamide) fiber, macromolecular chains, multiple of cell expansion, length of bond broken, mechanical properties Abstract: Poly (p-phenylene terephthalamide) (PPTA) fiber is a high-performance aromatic polyamide fiber that has a wide range of applications in aerospace, defense, automotive and other fields.
From the above expansion model, it can be seen that the unit cell only expands in the Z direction, while the X and Y directions remain unchanged, and the molecular chains inside the unit cell continuously elongate in the Z direction. 4.3 Prediction of mechanical properties of PPTA fibers at the molecular scale 4.3.1 Prediction principle of mechanical properties of PPTA fiber unit cell structure model Principle of mechanical properties prediction method for PPTA fiber cell structure model: First of all, in order to calculate the mechanical properties of the microstructure, we wrote a set of Perl language scripts, in which a certain strain is applied to the model file first, the corresponding stress value can be obtained after calculation, and then the stress-strain results and the trajectory file in the calculation process are obtained, and then the model key length of the last frame is calculated.
Mechanical properties of crystal models with different expansion ratios Models PPTA111 PPTA112 PPTA115 PPTA1110 Tensile strength/GPa 24.25 21.29 17.4 12.54 Young's modulus/GPa 240 231 227 224 Fracture elongation rate/% 10 9 7.6 5.6 By comparing the mechanical properties of crystal models with different cell expansion ratios, it can be seen that as the cell expansion ratio increases, the tensile strength continuously decreases.
The main reason for the change in mechanical properties caused by the expansion factor is that the molecular chains inside the unit cell continue to elongate during the expansion process.
During the stretching relaxation process, the molecular chains inside the unit cell undergo segmental motion, and the molecular chain conformation changes, thereby affecting the mechanical properties of the unit cell model. 4.3.3 Comparison of mechanical properties of crystal models under different length of bond broken After the script stretching of the fiber unit cell model, the corresponding stretching process trajectory file can be obtained.

The examined Al-brasses have similar chemical composition but differ in microstructure, surface state what affects their corrosion and mechanical properties.
Fig. 1 Microstructure of the Al-brasses Surface properties The internal surface of pipes is mostly exposed to flowing liquid environment also their resistance to degradation will depend on mechanical and corrosion surface properties.
These factors have influence on mechanical properties and corrosion behaviour.
The brasses: properties & aplications. 2. ed.
Factors Affecting Corrosion and Fouling of Metal Condenser Tubes of Copper Alloys and Titanium.

The effects of the microstructure properties on the mechanical properties of C-Si-Mn hot rolled dual phase steel are reported.
It was observed that both the amounts of the martensite and the particle size of the ferrite significantly influence the mechanical properties of hot rolled dual phase steel.
The aim of our works is to develop a modeling method for controlling the microstructure properties of C-Si-Mn hot rolled dual phase steel through the experimental trend comparison of the aforementioned two factors on their mechanical properties.
Strength of the Ferrite.Ferrite in the dual-phase steel will affects the mechanical properties greatly, grain size of the ferrite is smaller, strength and plastic of the dual-phase steel will match better.
When the volume fraction is a fixed variate, grain size of ferrite become the main factor to the mechanical properties.

According to the factors which affected the properties of the composites, adopting the orthogonal table of L9 (34).
Table 1 Levels of Factors Levels Factors A B C D Length of the fibers(mm) Mass fraction of PLA(%) Molding temperature(℃) Molding pressure(MPa) 1 2 85 175 8 2 6 75 185 12 3 10 65 195 16 Mechanical properties of the cotton stalks bast fibers reinforced PLA Testing of tensile strength.
The data of mechanical properties were shown in Table 2.
Molding temperature was the most important factor which affected the mechanical properties.
If molding pressure was too light, PLA and fibers would not be well hold together and then it would affect the mechanical properties.

This study investigated the microstructure and mechanical properties of a wide-gap region brazed with various process variables.
It was observed that the brazing temperature was the main process variable affecting the mechanical properties of the wide-gap brazed region.
It was found that the (Cr, W)2B and the pore in the brazed region are important microstructural factors affecting the mechanical properties of the wide-gap brazed region.
Considering that increase of the fracture strength with brazing temperature and time, the brazing temperature is main factor affecting the mechanical properties of the brazed region.
It was believed that the (Cr, W)2B and pore in the brazed region were important microstructural factors affecting the mechanical properties of the wide-gap brazed region.

Experiment Research of Luming Molybdenum Mine Rock Physical and Mechanical Properties Zhang Ying-hua1, a, Zhao Bo-chuan1, b, Ye Zhou-jing1, c, Huang Zhi-an*1, d and Gong Ming-shan2, e 1State Key Laboratory of High-Efficient Mining and Safety of Metal Mines(University of Science and Technology Beijing), Ministry of Education, Beijing 100083, China 2Yichun Luming Mining Co.
Ltd., Tieli, Heilongjiang Province 152500, China azyhustb@163.com, blittlehwasin@vip.qq.com, cyezhoujing@126.com, dhuang_za@qq.com, e419328902@qq.com * Corresponding author: Huang Zhi-an Keywords: Luming molybdenum mine; slope stability; physical properties; mechanical properties Abstract.
Physical and mechanical properties of rocks are the fundamental factors affecting the slope stability, the rock physical and mechanical properties of the Luming molybdenum mine were tested and analyzed in the laboratory.
Because of the natural and man-made factors, the landslides, avalanches, mudslides form of slope deformation instability causes significant losses to people’s lives, property and engineering.
The research group drilled core in the field, then did the rock mechanics experiment in the laboratory to obtain various rock layers of rock mechanical properties parameters, and analyzed how the rock mechanical properties impact the slope stability.