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Study on the Lead-free Easy-cutting Mg-Sb Brass Li Lei1, a, Ma Biao1, b, Li Qiang1, c, Huang Guojie2, d 1School of Materials Science and Engineering, Henan Polytechnic University, Jiaozuo, 454000, China 2State Key Laboratory for Fabrication and Processing of Nonferrous Metals, Beijing General Research Institute for Nonferrous Metals, Beijing 100088, China alilei@hpu.edu.cn, bmjb2009edu@163.com, cliqiang@hpu.edu.cn, dhuangguojie@grinm.com, Keywords: lead-free brass, easy-cutting, machinability, hot working Abstract.
Taylor: Journal of the American Water Works Association Vol. 75 (1983), p. 92 [3] Y.H.
Kim: Journal of the Korean Institute of Metals and Materials Vol. 42 (2004), p. 537 [4] T.
Yoshikawa: Journal of the Japan Research Institute for Advanced Copper-Base Material and Technologies Vol. 41 (2002), p.97 [5] T.
Kim: Materials Science and Engineering A Vol. 345 (2003), p. 207

In these process, surface quality and material removal rate are of very important.
Two methods exist for conducting feedrate scheduling: one is based on the material removal rate (MRR) and the other is based on the cutting force [2].
Liu: Journal of Materials Processing Technology, Vol. 138 (2003), p. 513 [2] B.U.
Lazoglu: International Journal of Machine Tools and Manufacture, Vol. 44 (2004), p. 21 [3] L.Q.
Zhang: International Journal of Advanced Manufacturing Technology, Vol. 40 (2009), p. 1191

Analysis of bearing capacity of steel-high strength concrete composite beams Liangli Xiao, Mingyang Pan, Jian wei Han 1Wuhan University of Science and Technology,wuhan 430070,china. 2School of civil Engineering and Architecture,Wuhan University of science and Technology,wuhan 430070,china. 3School of civil Engineering and Architecture,Wuhan University of science and Technology,wuhan 430070,china.
The two materials together according to the form of composite beam can avoid the disadvantages of them and give full play to the advantages of two kinds of materials, forming the structure of high strength, high stiffness, good ductility.
Flange and web of equal thickness, the flange thickness of 0.01m, web thickness is 0.02m.In this paper three kinds of steel with the same section area, their proportion were 28.3.Materials using linear element.
The other is according to the material selection and specification level experience, strength and other indicators.
[2]Ruizs．E．Reliability Associated with Safety Factors of ACll31-89 and Mexico City concrete Design Regulations, ACI structural Journal, 990, NO．3, 1993 [3]Amadio C, Fragiacomo M．Simplified approach to evaluate creep and shrinkage effects in steel-concrete composite beams．Journal of Structual Engineering, 1997．123(9)：1153-1162

MD has been widely used to simulate the material behaviors in a variety of materials in nano scale movement.
It was found that the ultimate tensile strain for BCC materials is smaller than FCC materials and the ultimate tensile stress for rapid stretching is larger than slow stretching.
Also, Morse potential was concluded less suitable for analyzing the materials with BCC.
References [1] R.Komanduri and N.Chandrasekaran: Journal of Mechanical Sciences, Vol.43 (2000), p. 2237
[2] H.N.G.Wadley and X.Zhou: Progress in Materials Sciences, Vol.46 (2001), p. 329

Experimental Section Materials.
Nature Materials, 2011. 10(5): p. 398-406
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Chen [5] investigated the optimal thickness ratio of the constraining layer and the constrained layer for fixed materials of three layers.
[3] Alvelid M: Journal of Sound and Vibration, Vol. 310(2008), p. 947
[5] Chen Y C, Huang S C: International Journal of Mechanical Sciences, Vol. 44(2002), p. 1801
[9] Al-Ajmi M A, Bourisli R I: Mechanics of Advanced Materials and Structures, Vol. 15(2008), p. 250
[10] Douglas B E, Yang J C S: AIAA Journal, Vol. 16(1978), p. 925.

Experimental Materials and Instruments Sulphuric acid, Sodium bentonite, sodium polyacrylate (PAAS), Polyvinyl alcohol (PVA), Preparing Poly-dimethyldiallylammonium Chloride (PDMDAAC), defoamer Scanning electron microscope (SEM), Wire bar coater, Photograph glazer, Color ink-jet printer, Spectrodensitometer, Experimental Methods The modification of bentonite with acid The sodium bentonite was added to a flask containing certain concentration sulfuric acid solution, and then it was heated with water bath and mixed for a moment until the temperature reached 90℃ .The pH value of mixture solution was control 4～5 after the reactions.
Finally the mixture substances were dried, ground and sifted, and the last material was the modification of bentonite with acid.
(In Chinese) [3] Zhijing Chen, yuchuan zhang, Yu Zeng: Journal of Beijing University of Chemical Technology (Natural Science Edition), 2007, 34(3)：283-286.
[7] Wedin P，Svanholm E，Alberius P，et al: Journal of Pulp and Paper Science, 2006, 32( 1): 32
[8] James E, Margaret J，Dan F: Journal of Coatings Technology, 2003, 75(3) : 75．

Fang, Atomic-level stress calculation and surface roughness of film deposition process using molecular dynamics simulation, Computational Materials Science 48 (3) (2010) 520-528
Hong, Molecular dynamic simulation for Cu cluster deposition on Si substrate, Computational Materials Science 56 (2012) 85-94
Tanaka, Some essentials of simulating nano-surface processes using the molecular dynamics method, Key Engineering Materials 196 (2001) 31-42
Huang, Establishment of a cutting force model and study of the stress-strain distribution in nano-scale copper material orthogonal cutting, International Journal of Advanced Manufacturing Technology 33 (5-6) (2007) 425-435
Plimpton, Fast parallel algorithms for short-range molecular dynamics, Journal Comp.

Clipping Performance of the Structure with Cavities under Plane Impact Loads Guangfa Gao 1,2,3,a, Yongchi Li 3 ,Shujie Yuan 1,2,b*, Xuyang Li 3 1Key Laboratory of Integrated Coal Exploitation and Gas Extraction,Huainan,232001,China 2School of Energy and Safety, Anhui University of Science and Technology,Huainan,232001,China 3CAS Key Laboratory of Mechanical Behavior and Design of Materials,Hefei,230027,China agfgao@mail.ustc.edu.cn, bgfgao@ustc.edu.cn (Corresponding author) * Corresponding author.
Firstly, the constitutive parameters of materials used in numerical calculation are classical material parameters, which may not be in accord with actual values in the tests.
Secondly, materials used in numerical calculation were uniform while there were a lot of fractures due to the large scale of the test models.
Journal of University of Science and Technology of China, 2009, 39（9）: 931-935 [4] Gao Guang-fa.
Journal of Civil, Architectural & Environmental Engineering, 2011,33(3):57-62 [6] Gao Guang-fa, Li Yong-chi, Yao Lei, et al.

It is hoped this work will be of benefit to the development of diamond segments for circular sawing of natural stone materials.
In both cases, adhering materials can be seen on the surfaces on diamonds (Figs.4 and 5).
Gutmanas: Journal of Materials Science Letters, Vol.9 (1990), pp.726
Xu: Key Engineering Materials, Vol.250 (2003), pp.60
Duda: Soviet Journal of Superhard Materials (English Edition), Vol.8 (1986), pp.30.