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Introduction Fiber Reinforced Polymer (FRP) bars have a lot of excellent mechanical properties, the most important aspect is the excellent corrosion resistance.
Under the high temperature fire, the strength and stiffness of FRP rebar may lost, this is an important factor in affecting normal use for FRP rebar in structure.
Currently, the FRP in the high temperature strength and stiffness properties have not been studied in depth [1,2,3,4], this paper studies mechanical properties of GFRP rebars after high temperature, and the mechanical properties’ change regularity at continued constant temperature is studied at different times.
The research contents is the influence regularity of the factors of diameter of GFRP bars after high temperature, temperature and constant time on tensile properties.
Lu: Research on mechanical properties of glass fiber after high temperature fire.

The mechanical properties of corroded reinforced concrete under repeated load are investigated.
There are extensive experimental researches about mechanical properties of corroded reinforced concrete component and structure [1-5].
Only small numbers of the influence factors are considered in the experimental regression analysis, the human factors and corresponding limitations are also brought into the experiment.
In present paper, the mechanical properties of the corroded RC beam are studied.
Conclusion The mechanical properties of the corroded RC beam are researched by tests and the maximum crack width, mid-span deflection and reduction factor are predicted by using SVM method.

This study was carried out to investigate the effect of Flux Core Arc Welding factors on the mechanical properties of High Strength Low Alloy (HSLA).
The mechanical properties were obtained by performing the hardness test.
Basically, the metal that will be subjected to the hot welding process will affect the mechanical properties of the metal.
This steel is an alloy steel designed to have good mechanical properties.
One of the important material properties to know is mechanical properties.

Analysis of the Factors Affecting Crack Resistance of Dam Concrete Gai-Xin Chen 1, a and Fu-Tian Jiang 1 1 China Institute of Water Resources and Hydropower Research (IWHR)， Beijing, 100038，People's Republic of China a chengx@iwhr.com Keywords: dam concrete; roller compacted concrete; crack; shrinkage; tensile strain capacity Abstract.
This paper summarizes the author's understanding about the factors affecting cracking-resistance of dam concrete, such as cold shrinkage, drying shrinkage, autogenous volume deformation and tensile strain capacity, etc.
The key is to properly treat all the factors that may cause cracking.
However, concrete has its own physical properties and its "brittleness" nature can't be altered.
The influence of environmental factors on surface concrete is severe for concrete placed,especially during late summer and early autumn.

Factors Affecting the Pore Size in Porous Hydroxyapatite Produced by Stir-Froth-Polymerization Method Zhang Jie, Ning Xiaoshan∗, Xiao Qunfang, Yandg Lei, Chen Ke-Xin and Zhou He-ping State Key Laboratory of New Ceramics and Fine Processing, Department of Materials Science and Engineering, Tsinghua University, Beijing 100084, China Keywords: stir-froth-polymerization, porous ceramics, pore size, Reynolds number Abstract.
This paper focuses on the mechanism of frothing, and the influence of parameters in the mechanical frothing.
Comparing with other methods, such process is more competent due to the simpler equipments, wider range of adjustable pore size, spherical shaped cells, relatively better mechanical properties, and low content of organics.
This indicates that the formation of pores is affected by the intensity of disturbing flows caused during the foaming process.
The Reynolds number Re (=ρvD/η) reflects the disorder of the slurry, which affects the distribution of the pore size.

The main properties of sealing ring are the better wear resistance, is critical in determining the mechanical seal friction, wear, and the sealing performance, it also determines the working life of the mechanical seal[1].
The main object of this study is the welded metal bellows mechanical seal , based on the Fluent software platform, the latest achievements of theoretical research are combined with the mechanical sealing performance, according to the structure characteristics of the friction pair of bellows mechanical seal, analyze all kinds of factors affecting oil film characteristics, the relationship between the carrying-capacity of the fluid-film and the temperature, the viscosity of the fluid-film, the relationship between friction torque of the fluid-film and the speed, viscosity of the fluid-film, the influence factor of leakage are obtained.
The materials properties and the boundary conditions of the calculation within the region of the numerical model were settled.
After the numerical iterative of 1/90 of the circumferential shear value of the numerical model of fluid film, relaxation factor and other parameters were set up, flow field is initialized and iterative solution.
The properties and boundary conditions of the fluid -film was shown in Table 1: Table.1The material properties and boundary conditions of the fluid-film Spindle Speed rpm 1500~4000 Density kg/m3 886 Pressure Inlet Mpa 4 Cp j/kg-k 1400 Pressure Outlet Mpa 0.1 Thermal conductivity W/m-K 0.12 Medium Temperature ℃ 40~115 Viscosity kg/m-s 0.02~0.12 The Results of Numerical Calculation Carrying Capacity between the Fluid-Film.

Cementite can adversely affect the mechanical properties of the sample.
Fig. 4 Fracture morphology of annealed sample (a) integral (b) local Analysis of Mechanical Properties.
The mechanical properties of the ductile iron before and after annealing are shown in Table 2.
This is the result of a combination of factors.
[9] J Li, J Y Zhao, Y Yang, Effects of Nickle on structure and mechanical properties of ductile iron, Foundry, 65 (2016) 903-906

Aluminium alloy 7050 in a T7451 temper was friction-stir welded (FSW) to investigate the effects of different process parameters on the microstructure and mechanical properties.
The processing of FSW, the microstructure in FSW alloys and the factors influencing weld quality are introduced.
The local microstructure determines the weld mechanical properties.
T7451 is an overaged temper, specially developed by the aluminum industry to optimize corrosion resistance and mechanical properties.
In order to understand how the heat generated affects the stir zone (SZ) area and how the SZ area relates to the mechanical properties of the welds, its area was plotted as a function of heat input (Fig. 5B).

Surface roughness significantly depends on cutting factors, cutting tool properties, workpiece properties, and cutting phenomenon [1].
Many researchers have investigated the influences of cutting factors on the quality characteristics and the mechanical properties of the machined part using design of experiments (DOE) and response surface methodology (RSM).
The optimal turning factors could reduce the energy consumption and the surface roughness in which they could minimize the environmental impact of turning without affecting the quality of final products.
They found that cutting tool angle was the only significant factor affecting the average surface roughness with the optimal machining condition of 120º used for decreasing surface roughness of the machined part.
The results revealed that the rest factors did not significantly affect average surface roughness.

Chemical mechanical polishing (CMP) slurry was one of the key factors of CMP technology.
In this paper, through investigating the changes of several factors to evaluate the performance of CMP, such as the material removal rate (MRR), surface roughness Ra, 3D surface profiler, etc., the influence of various slurry and its content on the polishing efficiency and surface finish quality had been studied.
The results showed that different oxidant had different chemical action mechanism, also affecting the stability of CMP slurry and surface quality of specimen; adding suitable an oxidant to slurry could effectively improve the CMP performance.
Fig.3 The effect of oxidant content on MRR Hydrogen peroxide, a chemical compound with the formula (H2O2), had not been to taken as a slurry composition in the former experiments due to the property, its volatilizing and decomposing easily when encountered the light.
Gamble, et al., Chemi-Mechanical Polishing of On-Axis Semi-insulating SiC Substrates[J].