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With the rapid development of science and technology, the product reliability becomes one of important technical indexes, throughout the whole developed process [1].
The fault mechanism of product is analyzed from the physics, chemistry or materials strength by the De Natura Rerum model, this analysis is a sort of microcosmic analysis.
Acknowledgement This research is subsidized by the National Science and Technology Major Project of China under grant No. 2009ZX04014-014.
Sun: Design Theory and Method for Mechanical Reliability (Science Press, Beijing 2003) [2] X.
Zhao: Journal of Wuhan University of Technology Vol. 28 (2006), p.87 [3] V.

However, aluminum alloys are non-linear materials and their properties vary with casting and heat treatment modes.
After T6 heat treatment process, test coupons were obtained by machining from raw materials.
Metallic materials-Tensile testing at ambient temperature.
Metallic materials-Tensile testing at low temperature.
Metal materials-fatigue testing-axial force controlled method.

Effect of Arc Current Ultrasonic-frequency Pulsation on Underwater Wet Arc Welding Quality Jie Zhu a, JiaCheng Guo b, Wei Wang c and JiaYou Wang d, * Jiangsu Provincial Key Laboratory of Advanced Welding Technology School of Materials Science and Engineering, Jiangsu University of Science and Technology, 2 Mengxi Road, Zhenjiang City, Jiangsu 212003, P.
The test piece material was mild steel plate with the size of 300 mm length, 130 mm width, and 14 mm thickness.
Acknowledgements The authors acknowledge the financial supports from the Qing Lan Project and the National Natural Science Foundation of China (Grant No. 50675091).
Yu, et al: Journal of Jiangsu University of Science and Technology (Natural Science Edition), Vol. 22 (4) (2008), p. 24-27 [6] J.
Huang, et al: Key Engineer Materials, Vol. 450 (2011), p. 288-291 [7] L.

Preparation of WOx-TiO2 and the Photocatalytic Activity under Visible Irradiation Haiyan Song, Hongfu Jiang, Xingqing Liu,Yinzhu Jiang and Guangyao Meng∗ Department of Materials Science and Engineering, University of Science and Technology of China, Hefei 230026, P.R.
Taga, Science Vol. 293 (2001), pp. 269
Science Vol. 297 (2002), pp. 2243
Ge, Journal of Photochemistry and Photobiology A: Chemistry, Vol. 141 (2001), pp. 209
Xie, Materials Science and Engineering A Vol. 343 (2003), pp. 22 [9] A.L.

Experimental Procedure Material.
Zhou, Preparation and characterization of TiO2 thin films by the sol-gel process, J. of Materials Science. 36 (2001) 5923-5926
Yang, Preparation and microstructure of Al2O3-SiO2-TiO2 coating on three-dimensional braided carbon fiber by sol-gel technology, Materials and Design. 89 (2016) 928-932
Trapalis, Sol-gel processing of titanium-containing thin coatings, J. of Materials Science. 28 (1993) 2353-2360
Gulyaev, Preparation of carbon fiber for the application of interphase coating for composite materials with a ceramic matrix, Proceedings of VIAM. 10 (2017) 79-89

Dawson (Eds.), Simulation of Materials Processing: Theory, Methods and Apllications, Balkema, Rotterdam, 1995 [2] K.
Dawson (Eds.), Simulation of Materials Processing: Theory, Methods and Applications, Balkema, Rotterdam, 1995, pp. 847–852
Dawson (Eds.), Simulation of Materials Processing: Theory, Methods and Applications, Balkema, Rotterdam, 1995, p. 841–846
Wang: Simulation Analysis of Porthole Die Extrusion Process and Die Structure Modifications for an Aluminum Profile with High Length–Width Ratio and Small Cavity, Materials, (2018), p. 1-20
Valberg: Applied Metal Forming Including FEM Analysis, Norwegian University of Science and Technology, 2010

During ultra-precision cutting of brittle materials, the wear of diamond tool seriously affects the quality of machined surface.
Acknowledgements The authors gratefully acknowledge the financial supports of the Natural Science Foundation of Hebei Province (Grant NO.
Superhard materials and tools, Beijing, 1996
[14] Shimada S, Molecular Dynamics Analysis of Nanometric Cutting Process[J], Journal of the Japan Society of Precision Engineering. 29(1995) 283∼286
[15] Wang Qin-sheng, Superhard material manufacturing, Beijing, 2002

Study of the Structure Importance in Pipe Bridge Failure Fuzzy Assessment Xinqi Yua, Qinggang Liub* Hebei University of Science and Technology, Shijiazhuang, 050018，China ayxqyxq0016@163.com, bqgliu81@163.com Keywords: Pipe bridge, Fuzzy assessment, Fault tree analysis, Analytic hierarchy process Abstract: The safety status of pipe bridge is often studied by fuzzy assessment.
Table 1 Signs for every middle factor Sign Factor Sign Factor Sign Factor Sign Factor T Failure of pipe bridge B3 SCC C1 Outer corrosion C6 Influence of design A1 Leaking B4 Damage in fatigue C2 Inside corrosion C7 Influence of service process A2 Fracture B5 Damage of cables C3 Fault of installing C8 Maintenance of pipe bridge B1 Corrosion B6 Influence of operation and design C4 Stress level D1 Ways preventing corrosion B2 Defects B7 Damage by the third part C5 Corrosion failure of cables Table 2 Signs for every bottom factor Sign Factor Sign Factor Sign Factor Sign Factor X1 Undulation of pressure X10 Quality of welding X19 Coating quality of cables X28 Maintenance rules X2 Librating of pipe X11 Mechanic damage X20 Abrasion of cables X29 Maintenance log X3 Quality of outer coating X12 Original defects X21 Designing principles X30 Attitude of staffer X4 Pipe corrosion resistance X13 Stress concentration X22 Strength of pipe materials X31 Specialty still of staffer X5 Corrosion of
In Figure 1, all of the 36 factors are concerned, which can be concluded as corrosion, defects of materials, damage by the third part, operation and damage by outer forces.
Journal of Institute of Command and Technology, Vol. 6(2001)p.27 [3] Weiguo Li, Dingwen Yu, Tao Wang.

Howerer, spraying fire-resistant material not only increases cost but also prolongs work period, reduces indoor area and pollutes environment.
And so reducing fire-resistant coat, even not spraying fireproof material is a trend[4,5].
Experimental materials and methods Two steels with different composition were designed, as shown in Table 1.
Vol. 15(2007), p.20 [3] Zhang Xiaojuan, Yuan Shaoqiang, Liang Guoli: Journal of Tangshan College.
Vol. 2(2004), p.23 Acknowledgements The author wishes to thank the Natural Science Research Project for Colleges and Universities in Jiangsu, for their financial supports to the project No.08KJD460012.

References [1] Shilin Dong and Hengxi Xia: Journal of Building Structures Vol. 3(1982), p. 14-25, in Chinese
[4] Wenyang Liu and Wenfu Zhang: Applied Mechanics and Materials Vol. 71-78, p. 306-309 [5] Wenyang Liu and Wenfu Zhang: Advanced Materials Research Vol. 446-449, p. 480-483 [6] Wenfu Zhang: Spatial structures (Science Press, Beijing2005), in Chinese.