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A three-dimensional W-M fractal sliding model of double rough surfaces was established, and the factors of interface shear strength influenced the whole sliding process was considered.
The velocity in Z direction of sliding processes was analyzed using the finite element analysis and taking into account of adhesion factors in the process of contact.
Simulation and Analysis In the model, the material of the rough solid A is Ti-6Al-4V[7] ,the solid B is GCr15.The mechanical properties of the material are shown in Table 1.
Table 1 The mechanical properties of the material name Solid A Solid B Density /(kg·m-3) 4420 7800 Elastic Modulus E/GPa 115 198 Poisson's ratio g 0.31 0.26 The JC failure parameters (d1=0.242,d2=0.183 and d3=0.452) were obtained from characterization work carried out by Peirs et al [8].A plot of true stress versus true strain for the chosen material model is shown in Fig. 4.
The reason is that shear strength of a fixed interface is equivalent to adhesion factors, with the increase of adhesive force, the wear rate is more, and the surface roughness is smaller, the friction vibration is more gentle.

Titanium with surface nanostructure has superior mechanical and biological properties, which benefits titanium implants.
The formation process of HA crystals on the oxide film is affected by two factors: nucleation of HA and diffusion of Ca and P ions from the inner layer towards the film surface.
The results demonstrate that the MAO coating formed on the USP-treated Ti has an optimumcombination of mechanical properties and bioactivity after MAO treatment for 20 min.
The results clearly demonstrate that the MAO coating formed on the USP-treated Ti exhibits an optimum combination of mechanical properties and bioactivity.
Ultrasonic impact peening for the surface properties management.

Aiming at multiple horizontal fractures should be located exactly in hole, based on its affecting factors intensive analyzing in fracturing and field technological stimulation mechanism research, a study and application of hydraulic jet fracturing (HJF) has been introduced.
Where the flow rate will severely affect the second fracture initialization especially in critical in-situ stresses conditions.
For C6 reservoir, temperature is not high, fracturing fluid anti-shearing properties is necessary only.
Regardless what the interbed in stimulation it is, mechanical sealed packer stimulation is impossible for the space, at least 4m needed usually (refer with: Table 1).
To confirm HJF effect, we have selected adjacent wells conventionally fractured in the same producing layer and in the same cluster well group as compared wells, the compared producing layer have the nearly same properties on well logging.

Classically, the hardening of instrumental and structural materials is achieved by the introduction of alloying elements and heat treatment through rational control of the chemical composition and structure of materials, which makes it possible to obtain optimal physical and mechanical properties.
The general relationship describing the change in the damage of the structural material during the operation of the part, including the wearing cutting tool, can be represented as: where – critical value of damage; wt – technological damage to the material; J(Xi,t) – intensity of damage change at a point in time t, depending on the energy factors affecting the material Xi – temperature, loads, physical and chemical processes.
The application of a diffusion coating on a cutting tool affects not only its mechanical properties, increasing the wear resistance, but also the strength of the tool as a whole, by increasing its rigidity.
Tabakov, Formation of Wear-Resistant Ion-Plasma Coatings of the Cutting Tool, Mechanical Engineering, Moscow, 2008
Vereshchak, The Performance of the Cutting Tool With Wear-Resistant Coatings, Mechanical Engineering, Moscow, 1993

Mechanical testing To obtain properties of the material, the samples were uniaxial tensile strength tested along the tube axis direction.
The properties obtained experimentally showed good concordance with the deformations of the wall thickness obtained by numerical simulation of the hydroforming process.
Fig.3 Tensile test specimens according to SR EN 10002-1:1995 Tensile test specimens were cut from the tube diameter Ø 35 mm in the longitudinal direction without affecting the characteristics of the material.
Stress-strain curves for cooper material and tensile strength testing results Uniaxial tensile strength testing consists in applying a tensile force on a specimen until fracture, in order to determine the mechanical properties characteristics.
Benyounis, Integration of finite element analysis and design of experiments to analyse the geometrical factors in bi-layered tube hydroforming, Materials and Design10 July 2010 [9] Mehdi Imaninejad, Ghatu Subhash
, Adam Loukus, Influence of end-conditions during tube hydroforming of aluminum extrusions, International Journal of Mechanical Sciences 46 (2004) 1195–1212 [10] Asnafi N, Skogsga˚ rdh A.

A change in the production route for manufacturing Ti6Al4V products, from the more traditional methods to an additive manufacturing route, requires an investigation of microstructure and mechanical properties because these are strongly influenced by the production route.
Structurally, good mechanical properties which are comparable to the bulk material were obtained.
One of the crucial factors was the β-transus temperature which defined the single β phase field and the α+β field.
Figure 2: SEM images of the top surface (perpendicular with building direction) Mechanical Properties As shown in table 1, the maximum load of the laser sintered parts is 46.29KN and the Young‘s Modulus is 112GPa for both specimen 1 and 2.
[5] Vrancken, B., Thijs, Lore,Kruth, Jean-Pierre,Van Humbeeck, Jan, Heat treatment of Ti6Al4V produced by Selective Laser Melting: Microstructure and Mechanical properties, in Journal of Alloys and Compounds2012.

Common photo-curing dental restorative materials under different C-factors are considered as case studies.
Thermo-Mechanical Properties.
The effects of mechanical and non–mechanical as well as geometric part constraints (C-Factors) need to be taken into account.
The mechanical properties of materials under study are quite different from those commonly used for structural applications but both of them share some FE modelling techniques [7-12].
Conclusions Many factors influence the residual stresses formation in dental restorations.

This type of distress usually results from the action of moisture leading to the degradation of the mechanical properties of the asphalt mixture and appears in the surface with varied forms such as rutting, cracking, or stripping.
Several factors, including material properties, mixture properties, quality of construction, and traffic and environmental conditions influence the rate of moisture damage in asphalt pavement [1].
Evaluate the effects of air voids and in presence of water on dynamic properties that affect and control moisture susceptibility of asphalt mixtures. 2.
It indicates that the air void content clearly affect the dynamic property in the asphalt mixture.
Harvey, Field investigation of factors associated with moisture damage in asphalt pavement, 10th International conference on asphalt pavement (ISAP), Quebec, Canada, (2006), 691-700

The important factors affecting stress concentration are found.
The material properties differ when the fibre volume fraction is altered.
Fig. 6: Stress concentration factors for T700S graphite/epoxy plates under axial loading The stress concentration factors for S-2 glass/epoxy plates under bending loading are shown in Fig. 7.
Fig. 8: Stress concentration factors for T700S graphite/epoxy plates under bending loading The stress concentration factors for both axial and bending loadings are plotted vs.
Fig. 9: Stress concentration factors vs.

Precipitation-hardenable 6xxx series aluminum alloys are incorporated in many structural components with due consideration of their good combination of properties including a relatively high strength, outstanding extrudability and excellent corrosion resistance.
In this respect, friction stir welding (FSW) presents a tremendous potential for assembly of aluminum structures for the transportation industry due to the low heat involved that can mitigate crack formation and, thus, translate into improved mechanical performance of the assembly.
Figure 5: Microstructure for double pass FSLW – Tool geometry C, 1750 rpm, 8 mm/s: (a) Weld nugget, (b) Thermo-mechanically affected zone and (c) Heat-affected zone.
Reynolds, Factors affecting the properties of friction stir welded aluminum lap joints, Welding Journal 80 (12) (2001) 281–7
Jahazi, Process optimisation and mechanical properties of friction stir lap welds of 7075-T6 stringers on 2024-T3 skin, Materials and Design 31 (2010) 3324–3330.