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Experiments Materials.
The materials investigated here are three types of PTFE self-lubricating spherical plain bearing carried out at room temperature.
The overview of test bearing materials can be seen in table 1.
Figure 3(e,f) shows the liner of bearing III has been severely damaged and the surface layer of woven materials has been worn away, the woven patterns of liner no longer existing.
Li: Journal of Functional Materials Vol.35(2004),p. 2221-2223.

Under normal circumstances, it is being abraded gradually; the main reason of abrading is the grinding force, the metamorphism of filter materials and chemical corrosion which result from high temperature.
When some filter bags were torn in small area, old filter bags or some new bags with the identical materials could be used to mend.
Since some filter materials have poor antioxidant ability, when they contact the gas in high oxygen content, they will be oxygenated which lead to intensity weakened and fracture.
Chinese Materials Science Technology ＆ Equipment, Vol.7 (2011).p80-80, 94 (in Chinese) [4] Xingjun Gu, Wei Hua：Application of Bag Filter Technology in Electro-precipitator Retrofitting.
Journal of Cleaner Production, Vol.17 (2009)

It is generally set that [η]-allowable fatigue strength safety factor is [η]=1.3-1.4,when even material, with high processing quality and precise calculation can be met.
[η]-allowable fatigue strength safety factor is [η]=1.4-1.7,with medium material and processing quality and lower calculation accuracy.
[η]-allowable fatigue strength safety factor is [η]=1.7-3, with uneven material especially when the limit of size is large, and low calculation precision.
Different loading methods produce different stress change rule, and the ultimate stress of asymmetric loop materials depends on the different loading methods, or on different stress change rule.
Journal of Mechanical Engineering Science,1991,205:291-304.

Alhama 2,b 1 Department of Materials and Manufacturing Processes Engineering, Universidad Politécnica de Cartagena (UPCT), Campus Paseo Alfonso XIII, 30203.
Introduction A knowledge of thermal properties is essential when working with high-temperature materials such as composites with matrices of copper and superalloys [1,2].
The thermal conductivity data corresponding to the metallic matrices and fibers are those provided by the manufacturers of these materials or by the online data base MatWeb [6].
Petrasek: Journal of Composites Technology and Research Vol. 16 (4) (1994), p. 343
[6] Matweb: Materials properties database (http://www.matweb.com, Virginia, USA 2004)

Journal Citation (to be inserted by the publisher ) Copyright by Trans Tech Publications Diamond-like Carbon Coatings on Ti-13Nb-13Zr Alloy Produced by Plasma Immersion for Orthopaedic Applications E.
Zavaglia 1 1 Department of Materials Engineering, Mechanical Engineering Faculty, State University of Campinas, Campinas/SP, Brazil, P.O.
Introduction Diamond-like carbon (DLC) films are often considered a suitable coating material for orthopaedic applications.
Title of Publication (to be inserted by the publisher) Materials and Methods Two different substrates (silicon wafer and Ti-13Nb-13Zr alloy) of 100x150x1 mm were used for the investigation.
Wang: Materials Science and Engineering A Vol. 213 (1996), p. 134.

An Interval Analysis for the Mesco Ductile Fracture Liu Changhong 1, a and Huang Hu2,b 1,2 College of Automobile Engineering Shanghai University of Engineering science, 333 Longteng Road Songjiang, Shanghai, China,201600 a liuch@sues.edu.cn, bhuangh@sues.edu.cn Keywords: random, confidence interval, mescofracture.
When the material parameters C1 and C2 are the normal distributions, the intervals of the material parameters are, 111 11 ],[ σzMCC UL ±= 222 22 ],[ σzMCC UL ±= ,1)( ν−==≥ CXXP LWhere Mk, k and zk (k=1,2) are the mean, standard deviation and real number of the material parameters respectively.
Examples The table 1 is the probabilistic characters of material parameters.
Randomness and fuzziness of mesco ductile fracture for metallic materials.
AIAA Journal, Vol.35(1997), p727.

Solar grade silicon is the major material of the PV industry, the method of preparing for solar-grade silicon is a hot spot nowadays.
Commonly, the Metallurgy process uses metallurgical grade silicon as the raw material.
Directional solidification technique enables the solidification structure of materials to put in order along a specific direction, namely as the directional or single crystal structure, which could improve scientifically mechanical and physical properties of materials.
[2] A.A.Istratov,T.Buonassisi,Materials Science and Engineering B 134 (2006) 282-286
Gao, X.J.Chen, S.Nakano, K.Kakimoto, Journal of Crystal Growth 312 (2010) 1572–1576.

(3) If materials used in our experiment and materials in real structures are identical, the following relation exists
(4) Where and are respectively the Young modulus of the original structure material and the imitation target material, and are respectively the moment of inertia of a T-shaped beam and the rectangular cross section beam, and the moment of inertia of the T-shaped beam in the proportionally reduced model is certain, and then, the inertia moment of the rectangular cross section to its neutral axis is as follows: (5) If , then,
References [1] Guo Tingwei, The Theory and Application of Model Experiment [M].Science and technology Press, Beijing, 1984 [2] Zhang Zhongguo, Ph.D.
Niu, “Identification of Mesodamage Parameters of 2169 Steel”, Journal of Materials Engineering, 2007, No. 4

Therefore it is one of important material in aeronautics and astronautics field [1-3].
Welding rod use the same material with 7075 aluminum alloy board and size is Ф2.0mm.
Journal Herbin Univ.
Materials for Mechanical Engineering.
Atapek, Effect of aging temperature and of retrogression treatment time on the microstructure and mechanical properties of alloy AA 7075,Metal Science and Heat Treatment.

The Flotation Test of Collophanite in Yunnan Province Hong Xiao 1,a , Quanjun Liu *1,b , Meiguang Jiang 1,c, Junlong Yang 1,d 1Faculty of Land and Resource Engineering, Kunming University of Science and Technology, Kunming, China a525333427@qq.com, cjmgsandong@163.com, dyangjunlng@163.com Corresponding author: Quanjun Liu bkmliuqj@sina.com, Keywords: siliceous collophanite straight-reverse flotation low grade Abstract: The samples belong to low grade siliceous collophanite.
Introduction Mineral resources are the material basis of human survival, and also are an important material guarantee of social and economic sustainable development.
Phosphate rock is important strategic resource in our country, it is not only the important chemical raw materials for making production of yellow phosphorus, phosphoric acid, phosphate fertilizer and other a variety of phosphorus products, also is the important material guarantee of food safety, and it is the material basis of fine phosphorus chemical industry too.
[2] J.X.Liu, Analysis of domestic phosphate rock resources their exploitation and utilization [J], Journal of the Chemical Fertilizer Industry, 2009, 36(6), 27-31