Search results

It’s an effective method for measuring and monitoring of structure response of asphalt pavement with sensor to evaluate materials performance and to verify the validity of mechanical model.
The agreement of experimental observations and calculative results shows the feasibility of FBG sensors in temperature and strain monitoring of asphalt pavement structures and the validity of mechanical model.
Introduction The effect of temperature on pavement performance is generally considered to be a very important factor since it directly affects the structural capacity of pavements.
Thermal expansion and contraction adversely affect asphalt pavements, mainly by causing thermal transverse cracking.
Comparison of Monitoring and Calculated Results With the asphalt pavement being treated as an elastic layered system, we calculated the analytical solutions of temperature and strain by transfer matrix method, and material properties are indicated below: Asphalt surface: E1=1500MPa, μ1=0.25, a1=2.16×10-5 1/°C, κ1=2.8×10-3, λt1=1.0, h1=0.1m; Macadam base: E2=700MPa, μ2=0.25, a2=1.5×10-5 1/°C, κ2=3.0×10-3, λt2=1.2, h2=0.25m; Soil subbase: E3=40MPa, μ3=0.35, a3=5×10-4 1/°C, κ3=2.5×10-3, λt3=1.0.

The global and local stress intensity factors for finite kinked cracks, the stress intensity factors for finite transverse cracks, and the Paris law for fatigue crack propagation are used.
The global and local stress intensity factors for kinked cracks, the stress intensity factors for transverse cracks, and the Paris law for fatigue crack propagation are utilized in the model.
The accurate global and local stress intensity factors for finite kinked cracks in Lin et al. [8,9], the stress intensity factors for finite transverse cracks in Tada et al.[14], and the Paris law for fatigue crack propagation are utilized in the model.
Burford, Factors Affecting the Properties of Swept Friction Stir Welds, SAE Technical Paper, Society of Automotive Engineers, Detroit, (2008) 14-17
Pan, Stress Intensity Factors for Spot Welds and Associated Kinked Cracks in Cup Specimens, International Journal of Fatigue (2005) 81-98

But for many years, green mining evaluation is lack of uniform standards and subjective decision factors affect much, so it is partly unfair.
Classified properties C from Data set S has m different discrete attribute value {C1, C2, …, Cm}.
Punishment factor is based on the parameter, using α to represent each node punishment.
The second is the second deviating node, and the final deviating node has the minimum affect.
[5] Paul P S, Maiti J, The role of behavioral factors on safety management in underground mines, Science Safety, 2007, 45:449-471

Fabrication of Ultrahydrophobic ZnO by Vapor Phase Transport Zhijun Xi1, a Gang Li2, b,* Liming Lu 2, c 1School of Mechanical and Electrical Engineering, Xinyu University, Xinyu 338004, China 2School of Mechanical and Electrical Engineering, East China Jiaotong University, Nanchang 330013, China axyxzj2000@163.com, bligang0794@163.com, cluliming@mail.china.com * Author to whom correspondence should be addressed Keywords: Ultrahydrophobicity, ZnO, Vapor phase transport, Wettability, Bearing lubrication Abstract.
The surface structural properties of as-synthesized ZnO film was characterized using scanning electron micrograph (SEM).
Since the surface energy is an intrinsic property of materials, wettability is usually enhanced by the increase of surface roughness, especially by fractal structures [3].
The results showed that such a lotus-like structure with micro and nano-papillae in the film, which was strongly affected the contact angle and the rolling angle.
Ye and L.Cai: Chinese Journal of mechanical engineering Vol. 21 (2008), p. 77 [10] R.

The effectiveness of the LBC process depends upon the thermal properties and to some extent optical properties, rather than mechanical properties of the material to be cut.
Therefore, materials which exhibit a high degree of brittleness or hardness and have favorable thermal properties such as low thermal diffusivity and conductivity are well suited for LBC.
Moreover, modeling all these factors using conventional, analytical and numerical methods poses a substantial challenge.
ANFIS are fuzzy systems which use theory of ANNs in order to determine their properties through processing of data samples.
ANFIS harness the power of the FL and ANNs through utilizing the mathematical properties of ANNs in tuning rule-based fuzzy systems that approximate the way human’s process information.

Introduction Because of their excellent mechanical properties and good biocompatibility, ceramic balls for total hip replacements (THR) have been widely used [1].
The taper-bore contact length H, as defined in Fig. 2, is important, which affects the stress distribution and mechanical reliability of a ceramic femoral head.
The interfacial characteristics such as friction is another factor which influences load transmission, and hence the stresses in a ceramic femoral head.
When the friction coefficient at this interface reaches 0.35, maximum tensile stress along the taper interface reduces by a factor of eight.
Of the Institution of Mechanical Engineers [H], Vol. 214 (2000), p.685 [11] G.

As structure is an important bearing component, its performance directly affects the life of the system.
Introduction Sheet metal as the main support part for system, as it accounts for a large proportion in the system, its performance directly affects the life of the system.
Since the unit is divided into a variety of shapes and sizes, it adapts to the complex geometries, material properties and boundary conditions[2].
Structure material selection is Al7075; density is 2810 kg/m3; the yield strength is 455 Mpa; safety factor is 1.5; allowable stress is 303 Mpa; the maximum deformation amount is not more than 1mm; elastic modulus is 71700 Mpa; poisson's ratio is 0.33.
Modal is the natural vibration characteristics of the mechanical structure.

The hydraulic structural parts sensors also named "Installation Disk" were produced through mechanical cutting LY12-CZ rods for many years.
Thus, the relevant factors must be comprehensive considered to select the reasonable mold structure, which include shape and size of the casting, application requirements and alloy materials of the mould, performance and processing costs of the die, as well as specific equipment on which the die fixed.
In general, durying the squeeze casting process, the parameters that affecting the quality of the workpiece main include specific pressure, pressure start time, holding time, mold temperature, metal pouring temperature, mold lubrication and so on.
Table I: The process parameters of the squeeze casting for flange roughcast Parameter Specific pressure (MPa) Pressure start time (s) Pressure speed (mm / s) Holding time (s) Mold temperature (oC) Pouring temperature (oC) Value 80 ~ 90 5 ~ 7 10 5 ~10 250 ~ 300 680 ~ 690 In the squeeze casting process, specific pressure applied during solidification can make melting metal timely eliminate pores, shrinkage, shrinkage porosity and other casting defects under the influence of isopressing, generates the crystallization solidification conditions under the pressure, and gain fine-grained microstructure and mechanical properties[2, 16].
There are many factors that affecting the size of specific pressure, in addition to workpiece material, the press style, shape and size of the workpiece should also be considered, the general way to determine the value of specific pressure is through experiment.

The grain structure and intensities of the relevant magnetic texture of the hot band affect remarkable the resulting microstructure and texture in the cold rolled and annealed nonoriented electrical steel grades based on ferritic Fe-Si alloys.
The coiling or annealing after finishing the hot rolling process is an important factor, which gives rise to different grain structure across the thickness.
Introduction The magnetic properties of the finally fabricated Fe-Si steels critically depend on the microstructure and on the occurring texture components.
The resulting microstructure and texture is affected already by the hot rolling and the resulting thermal treatment after finishing the rolling process [1, 4].
The resulting grain structure and texture intensities are remarkable governed by gradients of strain and temperature during the thermo-mechanical process.

Indeed, mortars rheological properties are extremely important since several factors, related with placement, consolidation, durability and strength depend on the flow properties of the mortar paste.
In this work, the effect of ageing time on the rheological properties of fresh aerial lime-based mortars was investigated.
However, they were gradually replaced by mortars based on Portland cement due to the uniformity of fabrication and their better mechanical properties.
In mortars is now also common to use admixtures in order to improve or adjust some properties (in fresh and hardened state).
Ageing promotes the water intake, creating inter-particle films that make the mortar more cohesive but with better flow properties.