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Introduction Acoustic emission (AE) is a naturally-occurring phenomenon in materials, in which the rapid release of energy from localized damage such as cracking generates elastic stress waves within the materials.
Hamstad, A Review: Acoustic Emission, a Tool for Composite-Materials Studies.
Journal of Acoustic Emission.
Journal of Acoustic Emission, 27, 18-26 (2009)
Journal of Acoustic Emission 19, 258–274 (2001).

Dental Materials. 2012, v. 28., p. 13-22
Dental Materials. 2011, v. 27, p. 29-38
Journal of Materials Science: Materials in Medicine. 2000, v. 11, p. 675-682
Dental Materials. 2001, v. 17, p. 221-229
Journal of Applied Polymer Science. 2003, v. 90, p. 3753-3766

Compared with common materials, SMAs have two unique properties of shape memory effect and superelasticity, which will be valuable when applied to control the responses of civil structures.
On the other hand, considering current level of material processing technology, the qualities of domestic made SMAs are still not good enough, and large difference maybe exist among different batches of materials.
The calculation process is simplified by taking the advantages of not considering the physical characters of materials and no need to build the precise mathematical model.
Rogers: "One-dimensional thermomechanical constitutive relations for shape memory materials," Journal of Intelligent Material Systems and Structure, No. 1(1990), p. 207-234
Brinson: "One dimensional constitutive behavior of shape memory alloys: thermomechanical derivation with non-constant material functions," Journal of Intelligent Material Systems and Structure, No. 4(1993), p. 229-242

Effect of Hydrogen Concentration at Overlay / Base Metal Interface on Repair Weldability of Petroleum Pressure Vessel Hiroaki Mori1, a , Kazutoshi Nishimoto 1,b and Rinzo Kayano 2,c 1 Manufacturing Science Course, Division of Materials and Manufacturing Science, Graduate School of Engineering, Osaka University 2-1 Yamadaoka, Suita, Osaka 565-0871 JAPAN 2 Muroran Research Laboratory, The Japan Steel Works, Ltd. 4 Chatsu-machi, Muroran, Hokkaido 051-8505 JAPAN a mori@mapse.eng.osaka-u.ac.jp, b nisimoto@mapse.eng.osaka-u.ac.jp, crinzo_kayano@jsw.co.jp Keywords: Repair welding, Petroleum pressure vessel, Hydrogen, Concentration, Overlay / base metal interface, Weld cold cracking Abstract.
It has been reported that such cracking is caused by hydrogen embrittlement in the degraded structural materials [3,4].
Table 1 Chemical compositions of materials used [mass%]Results and Discussion The crack susceptibility in y-groove weld cracking test and repair welding test was estimated by crosssectional observation after these tests.
Hydrogen distribution in the materials was calculated with using the diffusion equation based on activity, as demonstrated in following equation
Boniszewski : Welding journal Vol.6 (1971) p.223

Hence, it is necessary to characterize the tensile behavior of 3D braided composites with BMI matrix under high temperature thermal ageing if such materials are to be used with any confidence.
Experiments Materials.
The matrix material was a 6421 BMI resin, kindly provided by Beijing Institute of Aeronautical Materials, Beijing, China.
Zhang and H.J.Li: Computational Materials Science Vol. 39 (2007), p. 836–841
Li: International Journal of Solids and Structures Vol. 46 (2009), p.3422–3432

Those conducting oxides materials showed many advantages including excellent conductivity like mental, overcoming fatigue in ferroelectric films, and with perovskite structure that is suitable for improving lattice match when they are employed as electrodes.
Lim, M.Murakami, S.E.Lofland, A.J.Zambano, L.G.Salamanca-Riba and I.Takeuchi: Journal of Magnetism and Magnetic Materials Vol. 321(2009), p. 1955-1958 [11] S.Y.
Srinivasan: JOURNAL OF APPLIED PHYSICS Vol. 106(2009), 113901 [14] Q.X.
NAN: JOURNAL OF APPLIED PHYSICS Vol. 105(2009), 083915 [17] J.P.
ZHANG: JOURNAL OF APPLIED PHYSICS Vol. 105(2009), 063913

Rahmayetty, Characterization and Application of Bayah Natural Zeolites for Ammonium Capture: Isotherm and Kinetic, Material Science Forum 988 (2020) 51–64
Journal Taiwan Institute Chemical Engineering 122 (2021), 51–57
(Fifth E., Eds.; Elsevier Science B.V.: Amsterdam, 2007; pp. 10–16 [14] J.R.H.
Muraza, Facile control of nanosized ZSM-22 crystals using dynamic crystallization technique, Microporous Mesoporous Materials, 227 (2016) 16-22
Communications in Soil Science and Plant Analysis, 30 (1999) 1417–1430.

According to the experimental statistics, current density can be promoted by tens or even hundred times, which largely heightens deposition rate; (2) Refined and compact deposited materials structure.
Qu: Materials and Design, (2007), No.28, pp.1776–1779
International Journal of Machine Tools & Manufacture, Vol. 49 (2009),No.11,pp. 850-858
Corrosion Engineering Science and Technology, Vol.48 (2013), No.1: pp.48-50
Chinese Journal of Aeronautics, Vol.23(2010), No4:pp 501-510

The next is mixing sand, making samples and testing performance. φ30×30mm cylindrical samples were made, compressive strength was tested by using SQW-Ⅱ non-metallic materials testing machine.
Acknowledgements This work was financially supported by the Science and technology project of Wuhan Science and Technology Bureau (Grant No. 201210321105).
[2] Lu Xia, Youshou Zhang, Jin Huang: submitted to Journal of Foundry Technology, 2009(1):p.15 (In Chinese) [3] Youshou Zhang, Tu Hu, Jin Huang, Lu Xia: submitted to Journal of Advanced Material Research, vols602-604(2012)：p.562 [4] Qingbao Li, Ning Fu, Guoping Zhao: submitted to Journal of Hot Working Technology，2012，41(9): p.61 (In Chinese) [5] Shifeng Deng, Canfeng Wang, Yan Zhou: submitted to Journal of Materials Science and Engineering A, 477（2008）: p.96

Proton conductors are interesting materials due to their potential application as solid electrolytes in ionic devices such as fuel cells, batteries, electrochromic glasses, etc. [1,2].
Huff (Eds.), Material for Electrochemical Energy Storage and Conversion-Batteries, Capacitors and Fuel Cells, Vol. 393, Material Research Society, Pittsburgh, Pennsylvania, 1995, p. 11
Arof (1998) , Journal of Power Sources, 74, 135-141
Uma, Ionics 7 (2001) 122-125 [12] S.Rajendran, Ravi Shanker Babu, P.Sivakumar, Journal of Membranes Science 315 (2008) 67-73 [13] A.
Mohamed, Advanced Material Research, Vol (129-131) P. 561-565.