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Editor Note It is a pleasure for me to serve as guest editor for a special issue of Materials Science Forum entitled "Deformation Processes of Rigid Plastic Materials".
I would like to thank the editor of the journal and all the authors for their contributions and for patience.
Sergei Alexandrov Institute for Problems in Mechanics Russian Academy of Sciences 101-1 Prospect Vernadskogo 119526 Moscow, Russia Tel.: +7 495 4343665; fax: +7 499 739 9531 E-mail address: sergei_alexandrov@yahoo.com

Journal of Materials Processing Technology Vol. 176, 2006, pp.214-221
Materials and Design, Vol. 30, 2009, pp.160-165
K., Ackershott G.: Machining of Hard Materials.
Journal of Materials Processing Technology Vol. 155-156, 2004, pp.1350-1356
International Journal of Mechanical Science Vol. 39, No. 11, 1997, pp.1273-1314.

We establish a multi-objective mixed integer linear programming model to find the optimal facility locations and materials flow allocation.
We establish a multi-objective mixed integer linear programming model to find out the optimal facility locations and materials flow allocation.
Chinese Journal of Management.
Management Science，Vol. 50(2004), p. 239-252
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The productivity of linear vibrating screen calculated by flow method is (5) Where is the screen width , is the materials thickness , is the loose density of materials , is the actual average velocity of materials .
For linear vibrating screen , the actual average speed of materials is (6) Where is the angular velocity ,is the vibrating direction angle, is the screen angle ,is the influence coefficient for screen angle to average velocity ,is the influence coefficient for materials thickness,is the influence coefficient for materials properties,is the influence coefficient for sliding motion.
Acknowledgements This work is financially supported by National High Techonology Research and Development Program of China (2006AA04Z408-2) and National Natural Science Foundation (50974077) References [1] Yongyan Wang,Yinglou Tai, Qihan Sun: Journal of Computational Mechanics Vol. 18(1) (2001), p. 94-98,in Chinese
[2] Yongyan Wang, Zerong Zhang: Journal of Mechanical Engineering Vol. 47(1) (2011), p. 101-105,in Chinese
[8] Yongyan Wang ,Xinhua Fu,Tiantong Guo: Applied Mechanics and Materials ,2010 ,Vols.37-38 pp.466-470

Fig.1 shows a variable cross-section stunt-and tie bar, and 39D mm= ， 30d mm= ， 1 3r mm= , materials is 40CrNiMoA , ultimate strength 1100bMPa σ = , and the maximum load max 400P kN= , the minimum load min 100P kN= − .
And surface quality factor 1β= because of the S-N curves for materials under tension and compression and structural loads in the same way.
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Materials and mix proportion Materials：Ordinary Portland cement P.O42.5, the compression strength at 28 days is 46.8 MPa; well-graded granite gravel with size from 5 mm to 31.5 mm, needle-like particles less than 5.3%, crushing index less than 6.8%, mud content less than 0.4% and apparent density 2620 kg/m3; river sand with fineness modulus of 2.9, mud content less than 1.8% and apparent density 2620 kg/m3; the air entraining agent.
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（3）The research try to supplement to the understanding of cell loaded new material, which is helpful to promote and complete the application of cell loaded new material in practice Acknowledgement This work was financially Supported by China Postdoctoral Science Foundation (Grant No. 2012M521015) and the Fundamental Research Funds for the Central Universities (Grant No. 2013G1291072).
Wang, D.S.Li, Journal of Materials Engineering 10(2008)287-295
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Experiment Study on Vibration in Milling of Stainless Steel 304 in Time Domain and Frequency Domain Shen Yang a, Chen Yongjie b, Fang Haitao c and Pang Jia d School of Mechanical Science and Engineering, Huazhong University Of Science And Technology ,1037 Luo Yu Road, Wuhan, China.
Austenitic stainless steel materials have been widely used in many areas, such as critical parts for modern power and chemical plants, automotive and aerospace industries.
However, austenitic stainless steel is classified under a group of materials that are very hard to machine [6].
Nijmeijer: International Journal of Machine Tools & Manufacture Vol.43 (2003), P.1437–1446
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. %), A356 intermediate alloy and mixed rare earth were used as the raw materials.
The Journal of the Minerals, Metals & Materials Society, 2004, 56(1):46-48
Metallurgical and Materials Transactions A. 2005, 36(8): 2059–2065
Materials and Design. 2015, 65:1229-1235
Journal of Materials Science, 2008, 43(22):7157–7164