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As well as the mechanical properties of FRP materials, the ultimate load analysis, the decision to use CFRP as a composite beam structural stiffness of the research materials.
The mechanical properties of common FRP are shown in Table1; the relationship of stress-strain is shown in Fig. 1.
Table 1 Mechanical properties of Fiber Reinforced Polymer.
Study on Tensile Properties of FRP.
When taking into account the impact of these various factors at the same time，there are studies has proved, after superposition, the stress is too large and the safety is large

The Influence of pH Value and SO42- Concentration on Strength of Cemented Soil Xiaoqiang Dong1,2,a, Xiaohong Bai1,b,Yongkang Lv 2,c,and Pengju Han1,d 1 College of Architecture and Civil Engineering, Taiyuan University of Technology, Taiyuan 030024, China 2 Key Laboratory of Coal Science and Technology, Ministry of Education and Shanxi Province ,Taiyuan University of Technology, Taiyuan 030024, China aE-mail: dongxiaoqiang@126.com, bE-mail: bxhong@tyut.edu.cn cE-mail: lykang@tyut.edu.cn, dE-mail: hanpengju1013@163.com Keywords: Cemented soil, Unconfined compressive strength, Reduction factor, pH value Abstract: The pH value and SO42- concentration in corrosive environment may affect mechanical property of cemented soil inturn to cause some serious damage to structure.
Finally a equation is set up based on the relationship of compressive strength and factors affected, which contain the reduced coefficient of compressive strength, pH value, SO42- concentration and corrosive time.
,and Han,P.J..Experimental study on mechanical property of cemented soil under environmental contaminations [J],Chinese Journal of Geotechnical Engineering, 2007, 29(8): 1260-1263 [5] DONG Xiao-qiang, BAI Xiao-hong, ZHAO Yong-qiang.
A study of electrical property of cemented soil eroded by H2SO4 solution.
Mechanical behavior of soil cement under ambient with sulfate conditions [J], Rock and Soil Mechanics, 2008, 29 Supp (11):659-662

Effects of pre-strain and tempering on mechanical properties in high-strength martensitic steels were investigated.
It would be meaningful to study the effect of pre-strain, an essential factor in ST treatment, by focusing on the change in mechanical properties and the deformation behavior of grain and phase units such as lattice and phase strains [2,5].
In the high-strength martensitic steels with high ρ, changes in the initial ρ value, dislocation movement during deformation, and stress partitioning between the phases affects the mechanical properties.
The mechanical properties were discussed by in situ neutron diffraction experiments.
Asada, Effect of strain aging on the mechanical properties of low carbon martensite steel, Trans.

The influence of the thickness and stiffness of the layer, elastic modulus of the substrate on the structural-mechanical properties of the deformed surface is studied.
Depending on the composition their mechanical properties vary from hard plastics to soft elastomers in a wide range of operating temperatures.
Sherban, Structural-mechanical and antibacterial properties of a soft elastic polyurethane surface after plasma immersion N2(+) implantation, Mat.
Soft polyurethanes treated by plasma immersion ion implantation: structural-mechanical properties of surface modified layer, J.
Nguyen, A Review of Factors That Affect Contact Angle and Implications for Flotation Practice.

On the other hand, in addition to its reported instability [4], for highly nonlinear materials and temperature-dependent mechanical properties, the isothermal staggered procedure is avoided in favour of stronger coupling strategies.
The other material properties are presented in Table 1.
In the present work, the effects of the specimen initial temperature, To, are discussed for selected temperature sensitivity factors, ¶s/¶T.
Parameter Value Elastic properties E 200 [GPa] n 0.3 Dissipation x 0.85 Yield stress s0 608.21 [MPa] e0 0.006326 n 0.1179 ¶s/¶T 0 |¶s/¶T| 3 [MPa/K] T* 300 [K] Damage properties r 2.6 [MPa] s 1.0 h+ 0.80 h– 0.001 Thermal properties r 7800 [kg/m3] cp 483.3 [kJ/kg K] k 36 [W/mK] Initial temperature To 300, 400 and 500 K Effect of the coupling strategy: The simulations have shown that the coupling strategy has not imposed a significant effect on the mechanical behaviour when the classical von Mises material model (no damage) was used.
Figure 2(b) highlights the effects of the coupling strategy for sensitivity factors ¶s/¶T = 0.0, -1.5 and -3.0 MPa/K for a specimen initial temperature To = 400 K.

For this paper I’m gone to describe some Influential factors on fatigue behavior of the AM materials which is based on the Ti‐6Al‐4V alloy. 1.
It has very good mechanical properties and corrosion resistance.
These properties make Ti‐6Al‐4V suitable for aerospace and automobile manufacturing.
These defects will produce micro notches and cause stress concentration which will heavily affect the properties of the parts, which is extremely danger in use.
The residual stress also affects the mechanical properties and fatigue properties of the material a lot.

The specimens were machined from the sintered compacts for the evaluation of the mechanical properties.
Mechanical properties.
Porosity, pore shapes, pore size may affect the mechanical properties of propous materials.
Porosity and bonded area of perticles is considered the major factors controlling the strength.
Mechanical properties of porous titanium specimen.

According to analyzing the influence factors of shaft fatigue properties, the matching relationships between fatigue properties and shaft material as well as other relevant factors have been investigated.
According to the fatigue failure strength theory, there are a number of influence factors of fatigue properties.
However, the shaft material is the most important factor which affects the anti-fatigue properties directly.
Influence factors of fatigue properties 1) Material properties and classification Most common materials are carbon steel and alloy steel.
Conclusion In this paper, influence factors of fatigue properties, such as material properties, stress concentration, structure shape and size, loading characteristics and so forth, have been investigated.

This essay, on the basis of fuzzy theory, illustrates the steps of fuzzy comprehensive evaluation, introduces the factors influencing 18Cr2NiWA's cutting processing performance, gives a fuzzy evaluation of the factors, and thereby successfully solves the problems regarding these multi-factors' decision and evaluation. 0 Introduction We should consider all aspects of factors because the things have variety of attributes or are affected by many factors.
Fuzzy comprehensive evaluation means to make decision and overall evaluation of factors affected objects or phenomena, it is a mathematical tool for fuzzy synthetic decision. [1] 1 The basic steps of fuzzy comprehensive evaluation First, we should make a independent evaluation according to each factor, and then click the all factors comprehensive evaluation, which mainly comprises the following steps: (1) Analysis of the influence of elements The factor set refers to the various important factors affecting evaluation objects as a collection of elements, the commonly used U said, U =（u1,u2,…, un）
The cutting performance of the artifact material mainly depends on the material mechanics, physical properties (such as hardness, strength, ductility, toughness and thermal conductivity), the chemical composition and microstructure is the main factors affecting the mechanical, physical properties, so the machining properties of materials is not a single basic attribute, it is the comprehensive reflection of some basic properties of the material, rather than a comprehensive performance, we should use an index system and evaluation guidance not a single index. [3] The traditional methods for evaluating materials cutting performance mainly use the relative processing, such as: ① Tool life or cutting speed of the life; ② Cutting forces or cutting temperature; ③ Surface quality; ④ The difficulty level of chip breaking.
The mechanical factors affecting the cutting performance: hardness, tensile strength, elongation, impact toughness, thermal conductivity, the physical and mechanical properties of the material are shown in table 1.
Tab.1 Physical and mechanical properties of 18Cr2NiWA steel material type and grade Hardness ( HBS) tensile strength (GPa) impact toughness (MJ/mm2) thermal conductivity (W/mK) Elongation (δ%) 18Cr2NiWA 359 1.13 1.17 41.22 11 (1) Establishing factor set The physical and mechanical properties of table 1 are seen as factors lumped elements.u1 is hardness, u2 is hardness, u3 is elongation，u4 is impact toughnes，u5 is thermal conductivity, U=（u1,u2,u3,u4,u5）

The Parameters Affecting Strength Calculation of Gears Silvia Medvecká-Beňová1, a *, Peter Frankovský1, b and Iveta Janeková1, c 1Faculty of Mechanical Engineering, Technical University, Letná 9, 042 00 Košice, Slovakia asilvia.medvecka@tuke.sk, bpeter.frankovsky@tuke.sk, civeta.janekova@tuke.sk Keywords: heat treatment, safety factor, gearing, material Abstract.
Good properties of heat-treated steels are at the correct thickness of the heat-treated layer of the tooth.
Suitable heat or chemical - heat treatment may improve the mechanical properties of the core and the surface hardness of the teeth of gears.
Fig. 2 Influence of module on safety factors Influence of materials (characterized by a bending fatigue strength) of the safety factor for the bending transmission is shown in Fig. 3.
Fig. 3 Influence of material on safety factors Subsequently, the proposed gearing was checked for bending and touch with the following results in Table 4.