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The surface undulation was affected mainly by several factors: the surface morphology affinity to cylindrical shape, reduction of the real area of contact and air pockets trapped in cylindrical double asperities of the surface.
Calculate real area of contact with Hertz and JKR models, the measured mechanical properties, such as hardness and elastic modulus of each layer by nanoindentation was used.
This result implied that there could be two important factors that were affected the adhesion.
References [1] Bandorf, H.Luthje, T.Staedler, Influencing factors on microtribology of DLC films for MEMS and microactuators, Diamond and Related Materials, Vol.13, 1491-1493, 2004
[2] Zachary Burton, Bharat Bhushan, Surface characterization and adhesion and friction properties of hydrophobic leaf surfaces, Ultramicroscopy, Vol.106, 709-719, 2006

In Dalian University of Technology, Professor Shiliang Xu [7] did the basic mechanical properties experiment study on ultra-high toughness cementitious composite.
Because of the differences of PVA fibers and the properties of materials, at present there still exists gap between the ductile high performance concrete that developed in China and those of America or Japan at the aspect of mechanical properties.
There are a few experimental studies on the mechanical property index of ECC material, which limits the application of this new kind of material on structure engineering.
The factors and levels are shown in the Table 1 and the mix proportions are shown in the Table 2.
Table1 Factors and levels of orthogonal test Factors Levels A Fiber by Vol B W/B C S/B D Fly Ash by mass 1 2.0% 0.24 0.60 30% 2 1.5% 0.26 0.48 40% 3 1.0% 0.29 0.36 50% 4 0.5% 0.32 0.24 60% Table2 Mix proportions and results of orthogonal test Test No.

Many researches have been conducted to find and improve the electrical and mechanical properties of the material.
For examples, researches were carried out to find the influential factor of the electrical properties in term of filler concentration [1], effect of frequency [2], and thickness and hardness [3].
The dissipation factor D can be calculated by D = Rs / |Xs|. (2) In order to extract other electrical properties, it is more convenient to convert the series impedance into a parallel impedance type.
Calculated electrical properties are shown in Fig. 2(c) through Fig. 2(f).
Properties and Applications of Dielectric Materials, ICPADM 2009.

It can be adopted to fabricate components with improved mechanical properties at high integrity and with very low defect levels particularly aiming at minimum porosity [2].This process is completed in its manufacturing system, generally named forming system.
Following the above process, components can be produced, but whose quality and properties cannot be guaranteed, also thus the advantages of squeeze casting cannot be attained.
It is evident that the last two factors are determined by the performance of the squeeze casting machine.
Fig.1 Relationships of the factors affecting squeeze casting forming process Hence, in order to produce components with optimal quality and properties by squeeze casting according to the original design data or customer's requirements, it is essential to control the above four factors and their relationships, besides following the conventional process steps.
The dies, the process parameters, the shape accuracy of the dies and the control accuracy of the process parameters by squeeze casting machines are the main factors affecting the squeeze casting production quality.

Furthermore, the factors affecting the UV transmittance is also analyzed in this article.
Introduction Because the synthetic quartz glass has the excellent properties of high light transmission, high optical uniformity, small thermal stress, strong radiation resistance and fine chemical stability [1], excellent [2], it is widely used in military and civilian optical system [3].
After high-temperature homogenization process, the shape of the quartz glass is more structured, the endoplasmic is more uniform, and the optical and mechanical properties are improved significantly.
It is found that the UV spectrum of quartz glass at the edge position has been affected after homogenization.
Spectroscopic Properties of Doped Silica Glasses.

Turning Test and Simulation of Difficult to Cut Materials 300M in Aviation Zhang Huiping1,a, Lai Yinan 1,b*, Wang Chongxun 1,c, Du Xu1,d 1College of Mechanical and Power Engineering, Harbin University of Science and Technology, Harbin 150080, China a zhping302@163.com, blaiyinan@126.com, c 64744591@qq.com, d1090348602@qq.com Keywords: difficult-to-cut materials; cutting force; linear regression Model; finite element analysis Abstract: Turning process properties of difficult-to-cut materials used in aeronautics are often associated with the machining accuracy and surface quality of aerospace structural parts.
Introduction Ultra high strength steel 300M has high strength, high transverse plasticity, fracture toughness and good anti-fatigue performance in mechanical properties, etc.
In according to the properties of material and lathe the SANDVIK indexable tool with cemented carbide is selected, and the blade type is CNMG120408-PM 4225.
This paper researches on how cutting velocity v, feed rate f and back cutting depth ap affect the cutting force and cutting temperature(θ) under the given tool, so the three factors are selected to carry out orthogonal test, and four levels are chose on basis of the material properties of the tool and workpiece.
The orthogonal table of three factors at four levels is adopted in this test, as shown in table 1.

The structural parameters, coating thickness, and physical and mechanical properties were chosen as comparison parameters.
And they are wear out according to the fatigue mechanism, which is typical for coatings with a high level of mechanical properties.
The experimental results of determining the mechanical and tribological properties of the studied coatings are presented in Table 1.
From the point of view of mechanical properties, the results presented in Table 1 indicate the advisability of choosing TiAlN and CrAlSiN coatings, since their strength characteristics are significantly higher than the similar properties of the substrate.
But under certain conditions, this effect can be completely suppressed by the dominance of other factors, for example, during oxidative wear of TiAlN coatings.

Test and Application of High Performance Concrete Ping Tan1,a，Yanmin Zhao2,b，Qiuhong Meng3, c 1,2Northern Beijing Vocational Education Institute,Beijing of China atanping106@163.com,b mhx791288@126.com,c1439624210@qq.com Key words: High Performance Concrete；Workability；Mechanical Property；Durability Abstract: The durability of high performance concrete is the main index of design. design.With the high durability, the high volume stability,the high compressive strength and the good workability, high performance concrete widely used in high-rise buildings, large-span Bridges, offshore in the construction of buildings, roads, etc.This paper prepared with different water/cement ratio of high performance concrete and tested the concrete workability, mechanical properties, durability.High performance concrete need preparate with low water/cement ratio, choose high quality raw materials,adding a sufficient number of mineral admixtures and high-performance admixture.
properties as the main basis[5].
Table 1 Test of concrete mix proportion kg/m3 Serial number water/cement ratio water cement fly ash mineral powder sand gravel admixture 1 0.28 134 341 56 83 680 1063 5.76 2 0.29 139 341 56 83 680 1063 5.76 3 0.30 144 341 48 91 680 1063 5.76 4 0.31 149 341 48 91 680 1063 5.76 5 0.32 154 341 48 91 680 1063 5.76 6 0.33 158 341 40 99 680 1063 5.76 7 0.34 163 341 40 99 680 1063 5.76 2.2 concrete mixture workability test The main factors influencing the working performance of high performance concrete is water-cement ratio, the dosage of the cementing materials and sand ratio, aggregate gradation, admixture of varieties and dosage, etc[7].
Table 2 Concrete mixture workability Serial number Water/cement ratio Slump/mm Extension degree/mm Out of time/s The slump after 1 h/mm After 1 h extension degree/mm Out time after 1 h/s 1 0.28 172 453 45 160 432 42 2 0.29 183 472 38 171 456 36 3 0.30 191 486 33 182 480 32 4 0.31 200 520 28 193 514 27 5 0.32 218 534 25 196 525 24 6 0.33 226 548 20 206 538 21 7 0.34 232 560 18 210 550 17 The table 2 shows that with increase water-binder ratio, concrete mixture workability, but water-binder ratio is too large, when the slump after the losses increase. 2.3 concrete mechanics performance test The main factors influencing the mechanical properties of concrete are water/cement ratio and the dosage of mineral fine admixture, followed by sand ratio and particle size of aggregate, etc.
Mechanical test results listed in table 3.

Rubber sheets are compounded using an L12 orthogonal array of Taguchi design of experiment, where ingredients are treated as factors varied at low and high loadings.
Crosslinking agents such as sulfur and peroxide are added to the elastomer to form three-dimensional polymeric structure to enhance its mechanical properties [4, 5].
This phenomenon can be unfavorable to health, safety, and the environment; it can also affect rubber performance such as weakening of adhesive properties and reduction of tackiness [9].
Tensile Properties.
Haile‐Meskel, Assessing effect of the reagglomeration and migration of chemical curatives on the mechanical properties of natural rubber vulcanizate, Adv.

The results indicated that when the temperature was below 300 °C, the PVA fiber could improve the mechanical properties of ULGC.
There is very little study on the mechanical properties of ULGC after exposure to elevated temperature.
A series of mechanical properties tests were conducted on ULGC before and after high temperature exposure.
Mechanical and Fracture Properties of Ultra-High Performance Geopolymer Concrete: Effects of Steel Fiber and Silica Fume.
Recommendation of RILEM TC 200-HTC: Mechanical Concrete Properties at High Temperatures—Modelling and Applications.