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(2) The constitutive relation of metal materials can not be gotten at high speed processing, so the constitutive relation at low speed processing is used in this model
Acknowledgement This research is supported by national nature science foundation of China (NSFC) project (No: 50975229) and science & technology project of Shaanxi province, China (No: 2009JQ7003）.
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Introduction Nano-machining of brittle materials is possible, using the ductile mode in which material is removed by plastic extrusion.
To study the behaviour of the brittle-to-ductile transition of brittle materials, indentation was commonly used in machining field [1-6].
Nano indentation is an important technique for studying the mechanical behaviour of materials at nanometric scale.
It has been an important topic that cracks occurred on brittle materials' surfaces can be predicted [7-9].
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In materials system of cement-slag-HF, NS reduces the ion Moore concentration of Al and increases that of Mg or Si.
Experiments Materials.
Table 1 Chemical composition of row materials /w% No.
Journal of Chongqing Jianzhu University (in China).
Journal of the Chinese Ceramic Society (in China).

Hardness: Table 2 reveals the hardness value of each Al-SiC composite materials.
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-Fly Ash Comp. using Stir Casting Method, in Dpt of Metallurgical & Materials Engg. 2009, National Ins. of Tec.
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The results will provide the basis for protecting engineering materials and structures not to erode by wind-sand environment.
The results will provide the basis for protecting engineering materials and structures not to erode by wind-sand environment.
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(4) The work piece is seen as a homogeneous material in simulation but the work piece material is not uniform in the actual processing
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It meets the strength requirements of materials.
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As a new carbon material, the expanded graphite has wide application in many industries.
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Among these materials, zinc oxide (ZnO) prepared at low temperatures has properties including non-toxicity, high transparency, and high crystallinity [2].
[3] Joydip Sengupta, Arifeen Ahmed, Rini Labar, Structural and optical properties of post annealed Mg doped ZnO thin films deposited by the sol–gel method, Materials Letters. 109 (2013) 265-268
[6] Qiang Shi, Junying Zhang, Dong Zhang, Changzheng Wang, Bing Yang, Bingyuan Zhang, Wenjun Wang, Red luminescent and structural properties of Mg-doped ZnO phosphors prepared by sol–gel method, Materials Science and Engineering. 177 (2012) 689-693
Khusaimi, Structural and Optical Properties of ZnO/PMMA Nanocomposite, Advanced Materials Research. 832 (2014) 602-606
Ahmad, Bandgap Alteration of Transparent Zinc Oxide Thin Film with Mg Dopant, Transactions on Electrical and Electronic Materials. 13 (2012) 64-68