Search results

Keyhole Modeling during Laser Deep Penetration Welding Renping Wang, Yongping Lei and Yaowu Shi School of Material Science and Engineering, Beijing University of Technology, Beijing, China wrp520@gmail.com Keywords: Laser welding, keyhole, free surface, numerical simulation.
Introduction Keyholes are a quite unique phenomenon observed in high power density material processes such as laser deep penetration welding.
Negro, "A study of the effect of multiple reflections on the shape of the keyhole in the laser processing of materials", J.Phys.
Mordike, "CO2 laser beam welding of magnesium-based alloys", Welding Journal, Vol. 77, 1998, p.149s-154s

These structures, referred to as multimorphs, consist in general of thin layers of piezoelectric, dielectric, conductor and elastic materials.
(5) Substitute eq.4 into eq.5, and in view of different materials in bimorph, the above formula will be changed as the following one
Acknowledgement All the research works were supported by the Natural Science Foundation of Ningbo of China under granted No. 2010A610129.
Fan: Chinese Journal of Mechanical Engineering (English Edition), Vol. 20(2007) No.2, pp.73-76 [4] L.T.

China 2 College of Chemistry, State Key Laboratory of Supramolecular Structure and Materials, Jilin University, Changchun 130012, P.R.
) 118.2(16) C(9)-N(2)-Eu(1) 120.8(14) C(1)-O(1)-Eu(1) 125.3(14) C(7)-O(3)-Eu(1) 124.9(15) C(7)-O(4)-H(4) 109.5 C(8)-O(5)-Eu(1) 124.7(14) C(8)-O(6)-Eu(1)#2 146.3(15) C(14)-O(7)-Eu(1) 124.7(16) Eu(1)-O(9)-H(9C) 117.1 Eu(1)-O(9)-H(9D) 134.3 H(9C)-O(9)-H(9D) 108.0 Eu(1)-O(10)-H(10C) 138.8 Eu(1)-O(10)-H(10D) 112.5 N(2)-C(9)-C(10) 121(2) N(2)-C(9)-C(8) 115(2) N(2)-C(13)-C(12) 124(2) N(2)-C(13)-C(14) 115(2) O(8)-C(14)-O(7) 127(2) _____________________________________________________________ Acknowledgments This study were supported by the Natural Science
ZR2010BL025), Open Project of State Key Laboratory of Supramolecular Structure and Materials (No. sklssm201323)(Jilin University), State Key Laboratory of Inorganic Synthesis and Preparative Chemistry (No. 2011-13)(Jilin University).
Journal of Coordination Chemistry, 63(2010), 2360–2369.

Jayakumar1 1Thin film Centre, Department of Applied Science, PSG College of Technology, Coimbatore, India 2Department of Physics, Coimbatore Institute of Technology, Coimbatore, India e-mail: saha.arul08@gmail.com, rkarul@yahoo.com Keywords: CuInGaSe2, CIGS, Hot wall deposition, Direct melting method, Cu-chalcopyrite, Low cost absorber layer Abstract.
It belongs to the group I-III-VI2 semiconducting optoelectronic material and possesses chalcopyrite structure.
Transmittance spectra of hot wall deposited CIGS thin films Conclusions CuInGaSe2 thin films have been deposited onto a glass substrates by hot wall deposition technique first time using the bulk material.
,Journal of Physics and chemistry of Solids. 69. (2008) 330-334
[4] M.Venkatachalam, M.D.Kannan,S.Jayakumar et al CuGaxIn1-xSe2 thin films prepared by electron beam evaporation, Solar Energy materials & Solar cells 92 (2008) 571-575

During the transformations from austenite to martensite and from martensite to austenite, or (7a) and (7b) where CM, CA, and , are material constants describing the relationship between phase transformation critical stresses and temperature.
Table 1 Material constants of SMA used for numerical simulations Ms / oC Mf / oC σcrs / Mpa σcrf / Mpa CM / Mpa/oC 18.0 9.0 100.0 170.0 8.0 Fig. 3 shows the phase transformation zone around the circular hole under different conditions of applied stress at the same temperature of 20oC.
Acknowledgements This work was supported by the National Natural Science Foundation of China (51102059), the Major Project Cultivation Plan of Fundamental Research Funds for Central Universities of China (HEUCFZ1004), the Harbin Talent Foundation of Scientific and Technical Innovation (RC2009QN017046) and the Fundamental Research Funds for Central Universities of China (HEUCF110202, HEUCF110204).
Birman: International Journal of Solids and Structure, Vol. 36 (1999), p.167 [6] B.
Yoon: Key Engineering Materials, Vol. 324-325 (2006), p.335 [7] L.C.

Besides, they also have extensive knowledge of various related disciplines such as art design, technical design, graphic design, interior design, packaging, technology solutions, new materials, and anthropometrics.
However, when graduating from college, most students lack understanding of techniques and materials, production processing technology, lack of coordination in teamwork, ability to withstand pressure is not high.
To help design graduates in Vietnam, the thing that needs doing at once is to add more modules providing technical knowledge such as manufacturing design, materials technology, and production organization.
Harrison, The design innovation spectrum: An overview of design influences on innovation for manufacturing companies, International Journal of Design.
[8] P.T.P Thao, H.T Thuy, Design industry overview and its manufacturing process in Vietnam, Journal of Science and Technology, Vol.(58), 124-128

FSP, previously was applied to low-melting-point materials such as aluminum alloys [3-6], has been researched for high-melting-point materials such as steel [7-10].
However, expensive price of these materials is a problem for practical application.
One of candidate materials is a Ti(C,N)-Ni cermet.
At the bottom face which contacts with a cast iron plate, adhesion materials are observed for the each tools.
Katoh, Banded Structure and Its Distribution in Friction Stir Processing of 316L Austenitic Stainless Stell, Journal of Nuclear Materials 420 (2012) 497-500.

Initial Analysis of the State of Raw Materials and Finished Products In order to carry out the analysis (Express), as well as to determine the state of raw materials and finished products in the food industry, spectral analysis methods are widely used in various ranges (from ultraviolet to far infrared (IR) – (4000-16000) cm-1 ranges) [6].
The composition of raw materials and finished products during the Express analysis, as a rule, is determined not only by the OS, but by a variety of OS of different physical quantities.
Effective applications siliceous raw materials of different genetic background [Text] /A.
Miroshnikov // Achievements and problems of material science and modernization of construction industry: materials XV Academic readings RAASN, Moscow, April 14-17, 2010. - Kazan: Kazan state University of architecture and civil engineering, 2010. - Part 2. - P. 108-112
Baskakov // Innovative materials and technologies (XX scientific readings): materials of the International scientific-practical conference, Belgorod, October 11-12, 2011 – Belgorod, 2011

The chosen values of the Young’s modulus for the different materials are taken from reference [16], section II, Part D.
For relatively small plastic strains the assumed tangent modulus will be likely to underestimate the real stress levels in both materials.
[6] Smallman and Ngan, Physical metallurgy and advanced materials, 7td ed., Butterworth-Heinemann, 2007, p.323
[8] Fukuoka, Nomura and Nishikawa, Journal of pressure Technology, 2012, vol 134, p. 021202-1 to 021202-6
[12] Moverare J., Oden M, Deformation behaviour of a prestained duplex stainless steel, Material science and engineering: A, 337,( 2002),1-2, 25-38

Preparation of Nano Rice-husk Ash and Effect on the Water-resistance of Magnesium Oxychloride Composites Kejing Xu 1, a,*, Jintao Xi 1,b and Yanqing Guo 1,c 1 School of Materials Science and Engineering, Shandong University of Technology, No.12, Zhangzhou Road, Zibo 255049, Shandong Province, P.
Figure 3 shows the microstructures of magnesite materials both with and without RHA.
It is clear that a suitable amount of nano RHA may make magnesite materials transform from an air hardening morphology to a hydraulicity morphology, and improve the water-resistance of the materials.
Yu: Journal of the Chinese Ceramic Society Vol 20 (1992), p. 13 [6] J.L.
Adam: Microporous and Mesoporous Materials Vol 103 (2007), p. 284 [13] J.P.