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�umerical Simulation Model Establishment of the Rock Material Model.
The material will be failure when the elastic deformation exceed the allowable value.
Therefore, we choose elastic strain material model to simulate rock material, which was applied in the simulation of rock fragmentation.
Rostami: International Journal of Rock Mechanics and Mining Sciences, Vol.44(2007), P.238 [4] H.Y.
Tang: International Journal of Rock Mechanics and Mining Sciences, Vol.39(2002), P.491 [5] SONG Jia-ning, LI Qin: Journal of Southwest Petroleum University, Vol.11(2007), P.113 (In Chinese) [6] ZHANG Ping, LI Ning, HE Ruo-lan: Chinese Journal of Rock Mechanics and Engneering, Vol.10(2006), P.2043 (In Chinese)

Introduction Ultralight metal materials with a lot of holes have multi-functional properties such as lightweight（ρ<1）, high specific strength, damping, anti-noise, heat transfer and so on.
The property of absorbed energy was studied usually in the plastically deforming area in these materials [7, 9], but few report was in the elastic deforming area.
These lightweight materials have high damping properties because of non-uniformity between air and metal framework.
Damping properties of these materials had been studied in different frequency range in the literatures[10-11], but a few results in ultrasonic frequency range.
Lu, Science in China(B), MIT, Vol.46, No.6, 2003:521-532 [5] Yang Donghui, He Deping, Science in China (B), 2001,44(4):411 [6] Zhen Mingjun, He Deping, Dai Ge, Science in China (B), 2002,45 (18): 598 [7] Zou Yi, He Deping, Jiang Jiaqiao, Science in China ( B), 2004, 47(5):407 [8] Wu Zhaojin, He Deping, Chinese Journal of Applied Sciences, 2001,19(4):357 [9] Zhen Mingjun, He Deping, Chinese Journal of Material Research, 2002 [10] He Deping, Yu Xingquan, Chinese Journal of Material Research, 1997,11(1):101 [11] Liu Changsong, Han Fusheng, Zhu Zhengang, ACTA PHYSCIA SINICA, 1997, 46(8): 1585

Nondestructive Evaluation of Polyurethane Materials Using Transient Thermography Mihaela Amarandei1,a, Karla Berdich 1,b , Izabella Szigyarto2,c , Lorand Kun1,d and Liviu Marşavina1,e 1“Politehnica” University of Timişoara, Mechanical Engineering Faculty, Mechanics and Strength of Materials Department, Bd.
Also, it was shown that the transient thermography method presented can be an important tool in evaluating structural defects of materials.
Thermography is one of these nondestructive testing techniques and is widely used for detection of defects impact damages, fatigue degradation of different materials [3] [4], as a fast inspection method and for the characterization of many engineering materials [2] [5].
For the evaluation of materials using thermography there are two aproaches one can use: passive [6] and active [7].
Rojek, et al.: Thermographic Diagnosis of Fatigue Degradation of Epoxy-Glass Composites, Journal of Achievements in Materials and Manufacturing Engineering, 24(2) (2007), pp.123-126

Experimental Procedure Materials.
Chabba: Materials Today No.4 (2003), p.22 [2] H.
Ousaka, Advanced Composite Materials, Vol. 16, No. 4 (2007), p. 377
Netravali: Journal of Materials Science Vol. 34 (1999), p. 3709 [6] K.
Brahmakumar: Journal of Applied Polymer Science Vol. 47, No. 10 (1993), p. 1731 [7] J.

His studies are similar with Neiman at the ratio of 5:3 Al2O3:Y2O3listed in Table 1.The as received materials were an Al2O3 powder (TAIMICRON tm-d, TAIMEI Chemical Co.
Materials and Methods Powders of commercially available Y2O3 (99,90%, Alfa Aesar, d50 10 µm) and Al2O3 (99.83%, Alcoa Alumínio S.
Waku: Science and Techn. of Adv.
Xiu: Journal of the European Ceramic Society Vol. 24 (2004), 2681
Campos, C.A.Costa: Brazilian Journal of Morphological Sciences Supplement (2005), p. 316

By introducing the composite materials from natural fibre reinforced polymeric materials, the resulting materials shows a good potential to be an environmentally friendly products.
Zulkifli, Acoustic properties of multi-layer coir fibres sound absorption panel, Journal of Applied Science, Asian Network for Scientific Information. 8, 20 (2008) 3709-3714
[7] Hong Zhou, Bo Li, Guangsu Huang, Sound absorption characteristics of polymer particles, Journal of Applied Polymer Science. 101, 4 (2006) 2675-2679
[9] Ancuta Borlea, Tiberiu Rusu, Silviu Ionescu, Mihaiella Cretu, Adina Ionescu, Acoustical materials-sound absorbing materials made of pine sawdust, Romanian Journal of Acoustics and Vibration. 8 (2011) 95-98
[15] Rozli Zulkifli, Zulkarnain, Mohd Jailani Mohd Nor, Noise control using coconut coir fiber sound absorber with porous layer backing and perforated panel, American Journal of Applied Sciences. 7, 2 (2006) 260-264

the alloy elements Mn composite materials plays an important role in improving the wear resistance.
This requires the cutter tooth multilayer compound material has good comprehensive performance, and required the metal materials must be in intensity, plastic and tenacity has the best supporting, if USES a single, overlaying welding materials difficult to satisfy the performance requirements.
The correct choice of medium the principle of the fusion welding materials. 5 2.8.
Hardness Test Each sample surface after the polished in HR-150 type A rockwell hardness measured on the hardness value for: Fig.1 Sample rockwell hardness histogram From the above can see, multilayer composite materials > 45Mn steel forging state matrix materials, namely the multilayer composite materials hardness value of 45Mn steel basic metal matrix single material of hardness value. 3.2.
ZHANG Zhi-hui, PAN Chun-xu, Mother Material Carbon Content On Heterogeneous Steel Welding Fusion Area Form of Influence, Materials Science And Technology(1995),Vol. 3,pp. 93-95 [7].

The discovery of a new class of inorganic materials, geopolymer, resulted in wide scientific interest and kaleidoscopic development of applications[1].
It was successfully synthesized using aluminum silicate raw materials at low temperature, which activated by alkali.
Journal of Hazardous Materials, 2009, 167 (1-3 ): 82- 88
Journal of Hazardous Materials, 2008, 157(2-3): 587-598
Journal of Henan Polytechnic University (natural science), 2011, 30(3): 361-365.

The main adhesion materials are the Cu and Al that are present in major quantity in the workpiece material.
Journal of materials processing technology, v. 138, n. 1-3, p. 479-483, 2003
Karnik, Investigations into the effect of cutting conditions on surface roughness in turning of free machining steel by ANN models, Journal of Materials Processing Technology, Volume 205, Issues 1–3, 2008, Pages 16-23
Assessment of surface roughness and MRR while machining brass with HSS tool and carbide inserts, Indian Journal of Engineering and Materials Sciences, 1 June 2015, Vol.22(3), pp.321-330
Machining Science and Technology, 23(6), 951-970

The article deals with the role of electrodes materials in improving the industrial wastewater treatment from pollutants by electrochemical action.
Accordingly, a bulk electrode shall be made of materials capable to function as both anodes and cathodes.
Deineka, Technology оf Safe Galvanochemical Process оf Strong Platings Forming Using Ternary Alloy, Problems of Emergency Situations: Materials and Technologies.
Materials Science Forum, 1006 (2020) 233–238
Kozyar, Design, synthesis, and diagnostics of functional galvanic coatings made of multicomponent alloys, Materials Sciense, 52 (5) (2017) 680–686