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Materials that have high value of sound absorption coefficient are usually porous [10].
References [1] M.R Anika Zafiah: Polymer from Renewable Materials, Science Progress, Vol.93 (2010), Iss.3, p.285-300 [2] M.R.
Part2; Thermal Degradation and Materials Properties, Prog React Kinetic and Mechanism, Science Reviews, Vol.34 (2009b), p.1-43 [3] M.R.
(Part I),Prog in Reaction Kinetic and Mechanism, Science Reviews,Vol.33 (2008), p.363-391 [4] M.R Anika Zafiah: Effect of Titanium Dioxide on Material Properties for Renewable Rapeseed and Sunflower Polyurethane, International Journal of Integrated Engineering (Issues on Mechanical, Materials and Manufacturing Engineering),Vol.1 (2009a), p.15-22 [5] J.Zhang , S.L.
Crocker: Recent Trends in Porous Sound-Absorbing Materials.

When the temperature reaches 390ºC, it can be seem from Fig.2 that the diffusion precipitation inside the grains begins to substitute the intermittent precipitation along the boundary of the grains, the tensile strength of the materials become greater, being about 390MPa; when the temperature increases further and reaches 420ºC, the grains after dynamic recrystallization begin to grow, the distribution of the second phase becomes uneven, the tensile strength of the material becomes less than that when the temperature is 390 ºC, the plasticity of the material decreases continuously.
Acknowledgements The present research is sponsored by National Natural Foundation of China (No.50735005, No.50605059), Shanxi Provincial Science Foundation for Youths of China (No.2007021026), and Development for Science and Technology in Higher Educational Institutes (No. 20081027).
References [1] H.T.Zhou, C.J.Ma, X.Q.Zeng, W.J.Ding: Materials Review, Vol.17-11 (2003), p.16 [2] T.
Diaka: Materials Science and Engineering A, Vol.496 (2008), p.247 [7] Q.Guo, H.G.Yan, Z.H.Chen, H.Zhang: Journal of Plasticity Engineering, Vol.7 (2006), p.739 [8] P.
Uchida: Materials Science and Engineering, Vol.434 (2006), p.131 [10] M.Shahzad, L.Wagner: Materials Science and Engineering A, Vol.506 (2009), p.141

Influence of Plastic Deformation on the Mechanical Properties and Microstructure of Homogenized AZ80 Magnesium Alloy Yaojin Wu1, a, Zhiming Zhang1, Baocheng Li1, Baohong Zhang1, Jianmin Yu1 and Yong Xue1 1North University of China, School of Material Science and Engineering, 030051 Taiyuan, China awyj@live.nuc.edu.cn Keywords: Plastic deformation, Microstructure, Mechanical properties, AZ80 Magnesium alloy Abstract.
When the temperature reaches 390 ºC, it can be seem from Fig.3 that the diffusion precipitation inside the grains begins to substitute the intermittent precipitation along the boundary of the grains, the tensile strength of the materials become greater, being about 390 Mpa; when the temperature increases further and reaches 420 ºC, the grains after dynamic recrystallization begin to grow, the distribution of the second phase becomes uneven, the tensile strength of the material becomes less than that when the temperature is 390 ºC, the plasticity of the material decreases continuously.
References [1] ZHOU Haitao, MA Chunjiang, ZENG Xiaoqin, DING Wenjiang: Materials Review,17-11 (2003), p. 16-18 [2] T.
Diaka: Materials Science and Engineering A, 496 (2008), p. 247-255 [7] GUO Qiang, YAN Hong-ge, CHEN Zhen-hua, ZHANG Hui: Journal of Plasticity Engineering, 7 (2006), p. 739-744 [8] P.
Uchida: Materials Science and Engineering, 434 (2006), p. 131-140 [10] Muhammad Shahzad, Lothar Wagner: Materials Science and Engineering A, 506 (2009), p. 141-147

Testing of anchored rock bolt with ultrasonic guided wave Wen He1,a, Qingsheng Liu2,b, Qirui Huang3,c 1Engineering Research Institute, Jiangxi University of Science and Technology, Ganzhou, Jiangxi 341000, China 2 Faculty of Metallurgical and Chemical Engineering, Jiangxi University of Science and Technology, Ganzhou Jiangxi 341000 3School of Mechanical and Electronic Engineering, Jingdezhen Ceramic Institute, Jingdezhen, Jiangxi 333403, China ahewen81@gmail.com, b lqs_01259@126.com, c779473812@qq.com Keywords: Ultrasonic guided wave, anchored bolt, Reflected wave, Attenuation Coefficient.
Results show that concrete as anchored material at different curing time can represent different bonding quality, and attenuation coefficient value of ultrasonic guided wave in anchored bolt increases as the increasing of curing time.
Acknowledgements This work was financially supported by the National Natural Science Foundation of China (50904028, 51264011）and Youth Science Foundation of Jiangxi Educational Committee, China (GJJ12365）.
Zhao: Journal of Jiangxi University of Science and Technology , Vol.33 (2012), p.21.
Applied Mechanics and Materials, Vol.117-119(2012), p.962.

The hard WC particles form the major wear-resistant constituent of these materials, while the cobalt binder provides toughness and support.
Materials One of the best methods by which the mechanical properties of the deposited layer can be improved is reducing the grain size of the grain size of the material.
Kruth, Composites by rapid prototyping technology, Materials & Design, Elsevier Ltd., Vol. 31, Issue 2, p. 850 – 856, 2010
Schoenung, The influence of working distance on laser deposited WC–Co, Journal of Materials Processing Technology 209, p. 4935–4941, 2009
Xian, A research on the grain growth of WC–Co cemented carbide, International Journal of Refractory Metals & Hard Materials 25, p. 121–124, 2007

Compared with other hard and brittle materials, Silicon carbide (SiC) has many superior material properties, such as high hardness, high stiffness, low thermal expansion coefficient, good dimensional and accuracy stability, high wear resistance etc.[1,2], shown in Table1.
[3] Xinhong Yang, Jiecai Han, in: Experimental study on ultrasonic vibration grinding of brittle optical materials, Optical Technology, 2007, 33(1): 65-67
[4] Yan Wu, Aiguo Sun, in: Grinding Mechanism of Two-Dimensional Ultrasonic Vibration and Experimental Study, Journal of North University of China(Natural Science Edition), 2007, 28(6): 486-490
Jackson, in: Ultrasonic vibration –assisted grinding of micro-structured surfaces on silicon carbide ceramics materials, Proceedings of the institution of Mechanical Engineers, Part B: Journal of Engineering Manufacture, 2012: 553-559
Hu, in: Kinematic view of tool life in rotary ultrasonic side milling of hard and brittle materials, International Journal of Machine Tools & Manufacture, 50 (2010): 303-307.

But in a long time, it is only used in the ultra-precision grinding of the materials with high brittleness and difficult to be used in the grinding of the materials with high toughness such as titanium and nickel-based alloys because of its compactness.
The raw materials include Cu-Sn-Ti powder, graphite particles and alumina bubble particles.
Journal of Materials Processing Technology.
Materials Science Forum.
A study of the quantitative relationship between strength and pore-size distribution of porous materials.

Because of significant differences in the mechanical properties between the two materials, seismic resisting system design rules for connections between carbon steel members may not be applicable, at least without modification, to connections between stainless steel members.
Gardner, The use of stainless steel in structures, Progress in Structural Engineering and Materials, 7 (2005) 45-55
Taheri, Cyclic hardening and fatigue behavior of stainless steel 304L, Journal of Materials Science,. 46 (2011) 145-154
[12] ASTM E8/E8M -16a:Standard Test Methods for Tension Testing of Metallic Materials, American Society for Testing and Materials, 2016: West Conshohocken, PA,United State
[20] ASTM E2126-11:Standard Test Methods for Cyclic (Reversed) Load Test for Shear Resistance of Vertical Elements of the Lateral Force Resisting Systems for Buildings, American Society for Testing and Materials,PA, United State,2011.

Journal of Anshan University of Science and Technology, 2004, 04:298-305
Journal of Northwest A & F University(Natural Science Edition), 2012, 08:193-199
Journal of Agro-Environment Science, 2013, 03:622-628
Journal of Agro-Environment Science, 2013, 03:595-600 [6]Zou Tingting.
Journal of Northeast Normal University(Natural Science Edition), 2009,03:30-35.

However, the reasonable strength parameters of coarse-grained soil have been troubled geotechnical workers: (1) the largest particle size of needed to reduce the test scale of original materials in the indoor test material.
Measuring the granular size Depending on Combination of screening and direct measurements method, this article did the on-site investigation to the particle size distribution of the granular materials of Xiyuanlin 413 step dumping site.
Status quo and tendency of studies on scale effects of coarse-grained materials[J].
Journal of Hohai University(Natural Science), 2009, 37(4)： 425-429
Chinese Journal of Geotechnical Engineering, 2009, 31(5)：811-816