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Commercial purity aluminum of 99.7% purity and the halide salts like K2TiF6 and KBF4 are taken as starting materials.
Improvement obtained is due to the fact that addition of harder materials to a softer matrix leads to increase in overall hardness of the composite.
Gupta, Journal of Mater.
Froyen, Journal of Mater Sci., Vol. 35 (2000), p. 837
Conf on Advanced Materials, Design and Development, December 14-16, 2005, Goa, [18] S.A.Kori, Jonnalagadda, R.Maiti, B.S.Murty and M.Chakraborty, Proc, of Inter.

This sealing material was expected to perform as the shock absorption material.
However, in spite of same material and same thickness, the difference of flow stress appears in each specimen.
Ogawa, Quasi-static and impact compressive properties of formed polyethylene film with closed cell, Journal of the Japanese Society for Experimental Mechanics, (2014) 153-157
[6] H.Kolsky, An investigation of the mechanical properties of materials at very high rates of loading, Proc.
Ogawa, On the effect of mechanical impedance mismatch in the split-Hopkinson pressure bar method, Journal of the Japanese Society for Experimental Mechanics 13 (2013) 244-249

Experimental Materials.
Manias: Chemistry of Materials, 2943-2949(2000) [3] C.M.
Bhowmick: ACS Applied Materials & Interface, 289-300(2008) [5] R.A.
Baer: Journal of Applied Polymer Science, 1207-1217(2000) [7] L.
Manson: Journal of Liquid Chromatography & Related Technologies, 207-230(2003) [8] Y.H.

With the new material development, the strength applied in building is more higher.
Neutral axis moved to compressive zone.the height of compressive zone reduced,the strain of the structural steel and steel bars is yield in tensile zone,then, the materials is yield in another zone.
Beijing, China: Science Press, 2006, - 20
Journal of constructional steel research, 2001, 41 were 1080 -, -
Journal of building structures, 2006, 27 supplement (1) 423-430.

Fig.2 Geometry of test specimen(Unit:mm) Fig.3 The stress-strain curve TABLE 1 MECHANICAL PROPERTIES OF TEST MATERIAL yield strain ultimate strain yield strength/MPa ultimate strength /MPa elastic modulus/MPa 0.022 0.132 240 375 2.06E5 Low Cycle Fatigue Test Condition The fatigue tests were conducted on the MTS Hydraulic Servo Fatigue Machine in ambient air at room temperature according to the "GB/T15248-2008: The test method for axial loading constant amplitude low-cycle fatigue of matallic materials".
Engineering Sciences.
China Civil Engineering Journal.
Journal of Aerospace Power.
Transactions of Materials and Heat Treatment.

Cables, decoration materials and other combustion will produce large amounts of smoke and heat when subway fires, and closed environment will soon be filled with smog, at that time the visibility is almost zero.
Because there are some inflammable things inside subway car, for example, thin flannel decoration materials are used in many new seats, and between car and car is interlinked.
Some old car decorations adopt combustible composite materials, it would rapidly produce a lot of nerve palsy gas to make people poisoning, suffocation, even death.
Acknowledgements This project was financially supported by the Liaoning Science General Project(L2012426).
[2] LI Jincheng: Journal of Natural Disasters Vol.21(2012), p.197-200

Methodology Materials.
Advanced Functional Materials, 31(22), 2100450
Materials Chemistry and Physics, 258(), 123943–. doi:10.1016/j.matchemphys.2020.123943
American journal of infection control, 41(5), S6-S11
New England journal of medicine, 382(16), 1564-1567

Welding materials and process parameters.
Welding materials and process parameters.
Welding materials and process parameters.
Sameer Kumar, a.o., Magnesium and its alloys in automotive applications – a review, American Journal of Materials Science and Technology, vol.4, no.1, pp.12-30, (2015) [8] F.
Pennsylvania, USA: The Minerals, Metals & Materials Society.

The low ductility of the as-cast AlSi10MnMg decreased material flow possibility.
The incompletely flowing the material along the tool’s flanks reduced the required pressure to press the material onto surface of thread profiles and therefore increased the flank roughness.
The incompletely flowing the material along the tool’s flanks reduced the required pressure to press the material and therefore increased the flanks roughness with increase in core hole diameter.
Biermann, Adapted process strategies in front face flow drilling and thread forming of lightweight casting materials, Procedia CIRP 103 (2021) 213–218
Pérez Pérez, Wear of form taps in threading of steel cold forged parts, Journal of Manufacturing Science and Engineering 137 (2015)

Improve the Mode and Optimize the Content to Improve the Metalworking Practice Teaching Effect JING Qin1,a, WANG Xu-gang2,b 1 Engineering Training Center, Nanjing University of Science and Technology, China 2Energy and Power Engineering Institute, Nanjing University of Science and Technology, China 210094 Nanjing, China ajingqin_w@163.com, bxgwang@yahoo.com.cn Key words: metalworking practice, teaching mold, teaching content Abstract: On the present situation of the metalworking practice, gives some suggestions to the reform of teaching mode and optimize the content, in order to make the metalworking practice play a bigger role for students to improve practical ability, enrich their own knowledge, study subsequent courses and join in work, etc.
Under the guidance of the teacher, the students should consult information, design works, determine the scheme, design parts, draw engineering drawings, select material, choose processing methods, formulate processing, manufacture, assemble parts, etc.
Along with the rapid development of mechanical manufacturing technology, national mechanical drawing standards, processing symbols and processing equipment, etc, are updated constantly, but the textbook, drawings, material, practice content of many engineering training centers cannot keep pace with the development of technology, this is a big obstacle for students understanding new knowledge, new equipment, new technology and production practice after graduation.
For example, in the plastic injection molding teaching, the author teach more basic knowledge of plastic injection mould to mold students, more knowledge of plastic injection molding machine hydraulic system to hydraulic students, more materials knowledge of plastic or mold to materials students, etc.
Journal of Suzhou College, Jan 2007, p112-113, (2007) [4] Dai Shi-ming: Optimize Metal Working Practice Contents to Strengthen Students' Innovative Ability.