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Online since: May 2011
Authors: Qing Xu Yao, Ming Chun Jia, Xiao Wei Wang, Jin Feng Men
Materials and methods
Material
The oil sample used in the experiments is turbine oil with real density measures 0.84g/cm3, and the kinetic viscosity is 46.9 cSt.
The nonwoven polypropylene (NWPP) fiber is purchased from Shanghai Xinluo Filter Material Company in China.
Spill Science & Technology Bulletin, Vol. 8(2003), p. 483–489
Journal of Hazardous Materials B131 (2006), p. 195–199
The nonwoven polypropylene (NWPP) fiber is purchased from Shanghai Xinluo Filter Material Company in China.
Spill Science & Technology Bulletin, Vol. 8(2003), p. 483–489
Journal of Hazardous Materials B131 (2006), p. 195–199
Online since: July 2011
Authors: Ling Zhao, Jing Yang
It can always solve those various problems in the production and management system and is also considered as a projective science and technology.
Data shows that: normally, sewers almost use 20% of their time for sewing, 61% for material handling and 19% for personal affairs, fatigue, and inevitable delay.
How to organize production materials, increase productivity by the greatest extent, improve product quality, lower the cost of production, under the environment of frequent changing kinds, needs our deeper research.
In fact, we generally take every ten materials needed as a transported unit, after 500 clothes produced every day, we can shorten about 600m by distance and reduce about 525s by time.
Beijing apparel of journals,2001(10):69.
Data shows that: normally, sewers almost use 20% of their time for sewing, 61% for material handling and 19% for personal affairs, fatigue, and inevitable delay.
How to organize production materials, increase productivity by the greatest extent, improve product quality, lower the cost of production, under the environment of frequent changing kinds, needs our deeper research.
In fact, we generally take every ten materials needed as a transported unit, after 500 clothes produced every day, we can shorten about 600m by distance and reduce about 525s by time.
Beijing apparel of journals,2001(10):69.
Online since: February 2011
Authors: Shao Mei Zheng, Cheng Zhao
Study on Active Screen Plasma Carburizing of Austenitic Stainless Steel
Shaomei Zheng1,2 ,a, Cheng Zhao1,b
1 Surface Engineering Laboratory, Qingdao University of Science and Technology, Qingdao, P,R,China, 266033
2College of Mechanical Engineering , Qingdao Technological University,Qingdao,P,R,China,266033
azsm197637@sohu.com, bC-zhao@126.com
Keywords: Active Screen Plasma Carburizing (ASPC); DC Plasma Carburizing (DCPC); Austenitic Stainless Steel; Sputtered Particles
Abstract.
The surface defects and process instabilities as arcing, edge and hollow cathode effects can be minimized or completely eliminated by the AS technique, with consequent improvements in surface quality and material properties [8].
Fig. 1 Schematic diagram of AS plasma carburizing system Materials.The material used in this study was AISI 304 with an average substrate hardness of 270 HV0.1.
Journal of Materials Processing Technology, Vol.168(2005),P189
The surface defects and process instabilities as arcing, edge and hollow cathode effects can be minimized or completely eliminated by the AS technique, with consequent improvements in surface quality and material properties [8].
Fig. 1 Schematic diagram of AS plasma carburizing system Materials.The material used in this study was AISI 304 with an average substrate hardness of 270 HV0.1.
Journal of Materials Processing Technology, Vol.168(2005),P189
Online since: October 2003
Authors: Jesús Toribio, E. Ovejero, Viktor Kharin
Journal Citation (to be inserted by the publisher)
Copyright by Trans Tech Publications
Mixed-Mode Stress-Corrosion Cracking of High-Strength Steel: the Role
of Cyclic Load History
J.
Experimental Procedure The material used was a cold drawn prestressing steel whose chemical composition was eutectoid (0.80 % C, 0.69 % Mn, 0.23 % Si, 0.012 % P, 0.009 % S, 0.265 % Cr, 0.060 % V, 0.004 % Al) and with Young modulus E = 199 GPa, yield strength σY = 1500 MPa and U.T.S. σR = 1760 MPa.
Numerical Modelling In this paper the effect of fatigue precracking is analysed by numerical modelling of the stress-strain state near the crack tip under plane-strain small-scale yielding in an elastoplastic material with kinematic strain-hardening whose characteristics correspond to the steel used in the experimental programme.
Acknowledgement Financial support of this work by the Spanish Ministry of Science and Technology (MCYT) and FEDER (Grant MAT2002-01831) is gratefully acknowledged.
Suresh: Fatigue of Materials (Cambridge University Press, Cambridge, 1991)
Experimental Procedure The material used was a cold drawn prestressing steel whose chemical composition was eutectoid (0.80 % C, 0.69 % Mn, 0.23 % Si, 0.012 % P, 0.009 % S, 0.265 % Cr, 0.060 % V, 0.004 % Al) and with Young modulus E = 199 GPa, yield strength σY = 1500 MPa and U.T.S. σR = 1760 MPa.
Numerical Modelling In this paper the effect of fatigue precracking is analysed by numerical modelling of the stress-strain state near the crack tip under plane-strain small-scale yielding in an elastoplastic material with kinematic strain-hardening whose characteristics correspond to the steel used in the experimental programme.
Acknowledgement Financial support of this work by the Spanish Ministry of Science and Technology (MCYT) and FEDER (Grant MAT2002-01831) is gratefully acknowledged.
Suresh: Fatigue of Materials (Cambridge University Press, Cambridge, 1991)
Online since: June 2015
Authors: Jedol Dayou, Mee Ching Ung, Rachel Fran Mansa, Coswald Stephen Sipaut
Fabrication and analysis of photoelectrochemical properties of dye sensitized solar cell using Local Borneon Natural Dye Extracts
Mee Ching Ung1,a, Rachel Fran Mansa1,b, Coswald Stephen Sipaut1,c, Jedol Dayou2,d
1Energy and Materials Research Group, School of Engineering and Information Technology, Universiti Malaysia Sabah, Jalan UMS, 88400 Kota Kinabalu, Sabah, Malaysia.
2Energy, Vibration and Sound Research Group (e-VIBS), School of Science and Technology
Universiti Malaysia Sabah, Jalan UMS, 88400 Kota Kinabalu, Sabah, Malaysia.
Acknowledgement This research project is carried out by the researchers of Energy and Materials Research Group under Materials and Minerals Research Unit.
Baljiepalli, M.R.Pichika, Antiproliferative and apototic of the standardised extracts of Etlingera elatior on human colorectal carcinoma cells, Malaysian Journal of Chemistry, 11(1) (2009)136-142 [9] P.Larkin, Infrared and Raman Spectroscopy; Principles and Spectral Interpretation,Waltham, USA, 2011 [10] S.
Acknowledgement This research project is carried out by the researchers of Energy and Materials Research Group under Materials and Minerals Research Unit.
Baljiepalli, M.R.Pichika, Antiproliferative and apototic of the standardised extracts of Etlingera elatior on human colorectal carcinoma cells, Malaysian Journal of Chemistry, 11(1) (2009)136-142 [9] P.Larkin, Infrared and Raman Spectroscopy; Principles and Spectral Interpretation,Waltham, USA, 2011 [10] S.
Online since: March 2014
Authors: Jürgen Bär, Stefan Seifert
Thermographic Investigation of Fatigue Crack Propagation
in a High-Alloyed Steel
Jürgen Bära * and Stefan Seifertb
Institute for Materials Science, Universität der Bundeswehr München,
Werner-Heisenberg-Weg 39, 85577 Neubiberg, Germany
ajuergen.baer@unibw.de, bstefan.m.seifert@gmail.com
Keywords: Fatigue, crack propagation, thermography, plastic zone.
Introduction Lock-in thermography is widely used to gather information about the deformation behavior of metallic materials under cyclic loading.
Volpp, Vollautomatische Durchführung von Ermüdungsrißausbreitungsexperimenten, Materials Testing, 43 (2001) 242-247
Harris: Stress Intensity Factors for Hollow Circumferentially Notched Round Bars, Journal of basic engineering, 89 (1967) 49-54
Introduction Lock-in thermography is widely used to gather information about the deformation behavior of metallic materials under cyclic loading.
Volpp, Vollautomatische Durchführung von Ermüdungsrißausbreitungsexperimenten, Materials Testing, 43 (2001) 242-247
Harris: Stress Intensity Factors for Hollow Circumferentially Notched Round Bars, Journal of basic engineering, 89 (1967) 49-54
Online since: June 2013
Authors: Y.S. Kuo
Introduction
A201 aluminum alloy is an important structural material and possesses the highest mechanical strength among all the cast aluminum alloys.
The material of end chill block was low carbon steel, whose thickness was 2 times that of the plate casting.
Kuo, “Mechanical Properties and Porosity Content of A201 Aluminum Alloy Castings in Different Cooling Rate Sand Molds,” Advanced Materials Research, Vols. 154-155, pp.787-793, 2011
%Cu Alloy,” Materials Science and Engineering , A108, pp265-270, 1989
Seshadri, “Dimensioning of Risers for Long Freezing Range Aluminum Alloys,” AFS Cast Metals Research Journal, pp.77-82, June 1971.
The material of end chill block was low carbon steel, whose thickness was 2 times that of the plate casting.
Kuo, “Mechanical Properties and Porosity Content of A201 Aluminum Alloy Castings in Different Cooling Rate Sand Molds,” Advanced Materials Research, Vols. 154-155, pp.787-793, 2011
%Cu Alloy,” Materials Science and Engineering , A108, pp265-270, 1989
Seshadri, “Dimensioning of Risers for Long Freezing Range Aluminum Alloys,” AFS Cast Metals Research Journal, pp.77-82, June 1971.
Online since: June 2013
Authors: Zhi Xue Wu
A common strategy for gradientless based approaches to achieve a constant stressed boundary is to add material where stresses are high and remove it where stresses are low [5-12].
Following the gradientless approaches, material is added around A if the local stress at this point is larger than the threshold boundary hoop stress, hence, Γ1 ‘grows’ to Γ2 and A is moved to A¢.
Therefore, in the context of reducing a peak of local maximum stress at A, as shown in Fig. 1, there are two optional approaches: 1) adding material at A (Γ1→Γ2); 2) increasing the curvature radius around A (Γ1→Γ ¢2).
Acknowledgements: The authors gratefully acknowledge the financial support of the National Natural Science Foundation of China (No. 51075354).
The Journal of Strain Analysis for Engineering Design. 34 (1999) 323-336
Following the gradientless approaches, material is added around A if the local stress at this point is larger than the threshold boundary hoop stress, hence, Γ1 ‘grows’ to Γ2 and A is moved to A¢.
Therefore, in the context of reducing a peak of local maximum stress at A, as shown in Fig. 1, there are two optional approaches: 1) adding material at A (Γ1→Γ2); 2) increasing the curvature radius around A (Γ1→Γ ¢2).
Acknowledgements: The authors gratefully acknowledge the financial support of the National Natural Science Foundation of China (No. 51075354).
The Journal of Strain Analysis for Engineering Design. 34 (1999) 323-336
Online since: August 2014
Authors: Yue Wu, Chun Lin Du, Zhong Xu Xu
Suggestions will be mainly provided from two aspects.
1) Considering from cable, adhesive, the materials composing satellite itself and other things like that used in satellite thermal vacuum test, use material with less quantity of degassing under high-temperature conditions in thermal test;
2) High-temperature baking decontamination of satellite can be conducted before the formal satellite thermal vacuum test, that is, before the installation of vacuum gauge tube, which will be helpful for the extension of the service life of vacuum gauge.
It can effectively control the steam evaporated by material enter into gauge tube directly which will cause the filament, electrode and other things polluted and therefore affect the service life of gauge tube.
There are various ways to control effectively the impact of material evaporation on hot cathode ionization gauge, one of which is adding baffle structure in the gauge hatch of gauge tube.
Moreover, the hot cathode ionization gauge with this kind of baffle structure has gained engineering application in semiconductor and other industries, whose service life extends nearly six times compared with that of common hot cathode ionization gauge. 2) Carry out research on measuring methods of organic matter containing a large number of phthalate and siloxane. we can consider from such perspective as filament and each electrode material, or filament and each electrode surface modification. 3) There is difference between the measurement of hot cathode ionization gauge put inside satellite and installed on the chamber wall, so great attention should be paid, otherwise the accuracy of its measuring result will be affected.
[3] Li Detian, Cheng Yongjun, Fengyan: Latest Progress in Measurement Technology of Ultra High and Extremely High Vacuum, Chinese Journal of Vacuum Science and Technology, Vol. 29.5 (2009), p. 522
It can effectively control the steam evaporated by material enter into gauge tube directly which will cause the filament, electrode and other things polluted and therefore affect the service life of gauge tube.
There are various ways to control effectively the impact of material evaporation on hot cathode ionization gauge, one of which is adding baffle structure in the gauge hatch of gauge tube.
Moreover, the hot cathode ionization gauge with this kind of baffle structure has gained engineering application in semiconductor and other industries, whose service life extends nearly six times compared with that of common hot cathode ionization gauge. 2) Carry out research on measuring methods of organic matter containing a large number of phthalate and siloxane. we can consider from such perspective as filament and each electrode material, or filament and each electrode surface modification. 3) There is difference between the measurement of hot cathode ionization gauge put inside satellite and installed on the chamber wall, so great attention should be paid, otherwise the accuracy of its measuring result will be affected.
[3] Li Detian, Cheng Yongjun, Fengyan: Latest Progress in Measurement Technology of Ultra High and Extremely High Vacuum, Chinese Journal of Vacuum Science and Technology, Vol. 29.5 (2009), p. 522
Online since: July 2015
Authors: Chun Fu Chen, John Han Chen
The developed approaches were implemented mainly with two different lay-ups of a 3-layered symmetric plates composed of typical silicon-based materials.
Apparently, piezoelectric effect may have a sound influence at low pretension (k=1), obviously stronger than the layer material effect.
Again, the material properties of the considered layers have little influence upon the variation of mechanical sensitivity.
Dumir, 2005, “Geometrically Nonlinear Axisymmetric Response of Thin Circular Plate under Piezoelectric Actuation”, Communications in Nonlinear Science and Numerical Simulation, 10, pp. 411–423
Chen, 2010, “Analytical Geometrical Responses in Large Deflection of Simply Supported Piezo-electric Layered Plate under Initial Tension”, Journal of the Chinese Institute of Engineers, 33, pp. 1005-1013
Apparently, piezoelectric effect may have a sound influence at low pretension (k=1), obviously stronger than the layer material effect.
Again, the material properties of the considered layers have little influence upon the variation of mechanical sensitivity.
Dumir, 2005, “Geometrically Nonlinear Axisymmetric Response of Thin Circular Plate under Piezoelectric Actuation”, Communications in Nonlinear Science and Numerical Simulation, 10, pp. 411–423
Chen, 2010, “Analytical Geometrical Responses in Large Deflection of Simply Supported Piezo-electric Layered Plate under Initial Tension”, Journal of the Chinese Institute of Engineers, 33, pp. 1005-1013