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Online since: September 2013
Authors: Fei Yang, Mao Hua Xiao, Zun Mang Ke, Si Hong Zhu, Deng Song Xiao
Accumulation plan enterprises in Jiangsu Province, the Central Universities basic service fee&Youth Science and Technology Innovation Fund of Nanjing Agricultural University (No.
International Journal of MachineTools&Manufacture.1995, 35(10):1425-1433
Journal of Materials Processing Technology, 1996:138-142
International Journal of Machine Tools and Manufacture, 1998, 38(3): 131-141
International Journal of MachineTools&Manufacture.1995, 35(10):1425-1433
Journal of Materials Processing Technology, 1996:138-142
International Journal of Machine Tools and Manufacture, 1998, 38(3): 131-141
Online since: November 2011
Authors: Hai Wu, Yu Feng Chen, Da Yang Gao, Ke Xi Guo, Jia Rong Wu
Automobile Redirector 3 Dimensional Parametric System Design
Kexi Guoa, Jiarong Wub, Hai Wuc, Yufeng Chend and Dayang Gaoe
Changsha University of Science and Technology, Hunan Province 410114, P.R.
So the 3 dimensional parametric main function is showed as follows:check 3d model, edit dimension, choose material, strength analysis, date saving. the structure of system is showed in fig1.
Finite element analysis module is used to test whether the parts is meet the requirements, the maximum stress tested will be compared with the maximum yield stress of the material the part use, if the maximum stress tested less than or equal to the maximum yield stress is meet the requirement, if the results is on the contrary, the dimension parametric or materials should be re-selected.
Acknowledgement: This work was supported by Science and Technology Plan of Hunan Province (2008FJ3017), and Changsha Science and Technology Plan (K1003051-11), China.
Yang: Engineering graphics journal, Vol. 31(2010) No.6, p. 80-84.
So the 3 dimensional parametric main function is showed as follows:check 3d model, edit dimension, choose material, strength analysis, date saving. the structure of system is showed in fig1.
Finite element analysis module is used to test whether the parts is meet the requirements, the maximum stress tested will be compared with the maximum yield stress of the material the part use, if the maximum stress tested less than or equal to the maximum yield stress is meet the requirement, if the results is on the contrary, the dimension parametric or materials should be re-selected.
Acknowledgement: This work was supported by Science and Technology Plan of Hunan Province (2008FJ3017), and Changsha Science and Technology Plan (K1003051-11), China.
Yang: Engineering graphics journal, Vol. 31(2010) No.6, p. 80-84.
Online since: May 2011
Authors: Xiao Yong Mao, Wei Hua Guo, Li Li Li
Journal of Engineering, 25:975-981,1998
Test standard for steel material.
Standard methods of fire test on building construction and materials, Philadelphia. 1990
Fire tests on building materials and structures.
Fire tests on building materials and structures.
Test standard for steel material.
Standard methods of fire test on building construction and materials, Philadelphia. 1990
Fire tests on building materials and structures.
Fire tests on building materials and structures.
Online since: February 2012
Authors: Yasir Nawab, Nicolas Boyard, Pascal Casari, Vincent Sobotka, Frederic Jacquemin
Delaunay, Modeling PVTX diagrams: Application to various blends based on unsaturated polyester—Influence of thermoplastic additive, fillers, and reinforcements, Journal of Applied Polymer Science, 92 (2004) 2976-2988
David, Thermal conductivity of insulations using guarded hot plates, including recent developments and sources of reference materials, Measurement Science and Technology, 12 (2001) R89
Jarny, Determination of Temperature Variable Properties of Composite Materials: Methodology and Experimental Results, Journal of Reinforced Plastics and Composites, 15 (1996) 479-496
Jacquemin, A Device to Measure the Shrinkage and Heat Transfers during the Curing Cycle of Thermoset Composites, Advanced Materials Research, 326 (2011) 19-28
Poehlein, A kinetic model for curing reactions of epoxides with amines, Polymer Engineering & Science, 27 (1987) 788-795.
David, Thermal conductivity of insulations using guarded hot plates, including recent developments and sources of reference materials, Measurement Science and Technology, 12 (2001) R89
Jarny, Determination of Temperature Variable Properties of Composite Materials: Methodology and Experimental Results, Journal of Reinforced Plastics and Composites, 15 (1996) 479-496
Jacquemin, A Device to Measure the Shrinkage and Heat Transfers during the Curing Cycle of Thermoset Composites, Advanced Materials Research, 326 (2011) 19-28
Poehlein, A kinetic model for curing reactions of epoxides with amines, Polymer Engineering & Science, 27 (1987) 788-795.
Online since: January 2012
Authors: Rui Qing Kang, Xiong Ying Shu, Zhi Hua Wang, Xi Sheng Li, Yan Xia Liu
Soft-iron is ferrous materials that concentrate magnetic flux into the material and do not have any remnant flux generated within the material.
Hard-iron sources are materials that have flux concentration abilities and can have remnant flux generation abilities.
Jinhui Lan at University of Science and Technology Beijing for the support she has provided us.
[9] Xisheng Li, Guanghua Yu, “Application of AMR sensors to vehicle detection”, Journal of University of Science and Technology Beijing, Vol. 28, No. 6, pp. 587-590, 2006
[10] Xisheng Li, Jiaxin Wang, et al, “Development of High Accuracy Magnetic Electronic Compass”, Chinese Journal of Sensors and Actuators, Vol. 19, No. 6, pp. 2441-2444, 2006
Hard-iron sources are materials that have flux concentration abilities and can have remnant flux generation abilities.
Jinhui Lan at University of Science and Technology Beijing for the support she has provided us.
[9] Xisheng Li, Guanghua Yu, “Application of AMR sensors to vehicle detection”, Journal of University of Science and Technology Beijing, Vol. 28, No. 6, pp. 587-590, 2006
[10] Xisheng Li, Jiaxin Wang, et al, “Development of High Accuracy Magnetic Electronic Compass”, Chinese Journal of Sensors and Actuators, Vol. 19, No. 6, pp. 2441-2444, 2006
Online since: July 2012
Authors: Min Wei Wang, Ren Lang Wang, Jia Wei Qu
Introduction
Medium chain polyglyceride is a new type of excellent non-ionic surfactant, its hydrophilic and lipophilic can be controlled based on the degree of polymerization and the degree of esterification of the carbon chain fatty acid ester [1].The polyglycerol is an important raw material for the synthesis of polyglyceride and the polyglycerides synthesized by polyglycerol of the degree of polymerization of 4-6 had better performance.
Usually liquid base was used for preparing polyglycerol with the advantages of a mature technology, raw materials and easy to get, short reaction time, low equipment requirements, and low content of cyclic polyglycerol.
Acknowledgements This work is financially supported by Jiangxi Provincial Department of Science and Technology References [1] Nie Rongrong.
Journal of Nanjing University of Science and Technology( Natural Science), 2011, Vol.35 No.1
Usually liquid base was used for preparing polyglycerol with the advantages of a mature technology, raw materials and easy to get, short reaction time, low equipment requirements, and low content of cyclic polyglycerol.
Acknowledgements This work is financially supported by Jiangxi Provincial Department of Science and Technology References [1] Nie Rongrong.
Journal of Nanjing University of Science and Technology( Natural Science), 2011, Vol.35 No.1
Online since: October 2011
Authors: B.Y. Tan, Shuang Gen Zhang, Z.W. Zhang, S.B. Jiang
Especially in recent years, femtosecond pulse, along with its extremly high peak power, no thermal transmission; and small damage volume, has been an effective tool to microchining transparent materials.
When a femtosecond beam was focused into transparent materials, the modification in the focused volume can be represented as variation of free electron density.
As we know, LN crystal is a promising nonlinear material and is a key element in integrated optics.
Vogel: IEEE Journal of Quantum Electronics Vol. 35, No. 8, August 1999
Rubenchik: applied Physics A of Materials Science & Processing
When a femtosecond beam was focused into transparent materials, the modification in the focused volume can be represented as variation of free electron density.
As we know, LN crystal is a promising nonlinear material and is a key element in integrated optics.
Vogel: IEEE Journal of Quantum Electronics Vol. 35, No. 8, August 1999
Rubenchik: applied Physics A of Materials Science & Processing
Online since: January 2008
Authors: Ke Zheng Sang, Chun Feng Wan
A study on the SiC/Al composites fabricated by pressureless infiltration
Kezheng Sang
1a
, Chunfeng Wan
1
1
School of Material Science and Engineering, Chang'an University, Xi'an 710064, P.R.China
a
sangkz@hotmail.com
Keywords: SiC/Al composite, pressureless infiltration, volume fraction, strength
Abstract.
Key Engineering Materials, v 249(2003), p.45-48 [3] N.
Murty, S.K.Thakur and B.K.Dhindaw, On the infiltration behavior of Al, Al-Li, and Mg melts through SiCp bed, Metallurgical and Materials Transactions A: Physical Metallurgy and Materials Science, v 31, n 1, ( 2000), p.319-325 [5] X.
The Chinese Journal of Nonferrous Metals, v 9, Suppl.1, (1999), p.20-24
Key Engineering Materials, v 249(2003), p.45-48 [3] N.
Murty, S.K.Thakur and B.K.Dhindaw, On the infiltration behavior of Al, Al-Li, and Mg melts through SiCp bed, Metallurgical and Materials Transactions A: Physical Metallurgy and Materials Science, v 31, n 1, ( 2000), p.319-325 [5] X.
The Chinese Journal of Nonferrous Metals, v 9, Suppl.1, (1999), p.20-24
Online since: September 2011
Authors: Bin Jia, Chun Tao Zhang, Jun Lin Tao, Zheng Liang Li
The dynamic mechanical constitutive equation of concrete under high temperture
Jia Bin1, 2, a, Li Zhengliang1, Tao Junlin2, b, Zhang Chuntao2
1Department of Civil Engineering, Chong Qing University, ChongQing, 400030, China
2Department of Civil Engineering and Architecture, Southwest University of Science and Technology, MianYang, 621010, SiChuan, China
aJiabin216@126.com, bTaojunlin@Swust.cn
Keywords: Concrete, High temperature, Dynamic Constitutive Relation, Damage Model
Abstract: Based on the test by the split Hopkinson Pressure Bar (SHPB), in this papaer the research on the dynamic mechanical properties of concrete under high temperture has been conducted, the influence law of temperature and strain rate on the mechanical peoperties has been analyzed, and the dynamic stress-strain curves of concrete under high temperature have been obtained.
High-temperature SHPB tests of concrete The specific information about the specimen-making and the test methods is described in document [4], in the tests, the impact velocity of the bullet are designed to be 5m/s, 7m/s and 12m/s, and the preset heating temperature are respectively the normal temperature(16℃), 200℃, 350℃, 500℃ and 650℃, namely, a total of 15 kinds of working conditions, considering the discreteness of the concrete materials and the complexity of the tests, each working condition completes testing of 8 to 12 specimens.
Meanwhile, to facilitate the analysis on the physical properties of materials, in allusion to the intercoupling between the strain rate hardening effect and the temperature softening effect, two mutually independent influence factors are set, denoting with and respectively, thus the stress-strain curves of concrete can be uniformly expressed as: (1) Where denotes the initial elastic modulus of the material, denotes the damage amount, and , obviously, the non-linear behaviors of the stress-strain curves are described completely with the damage amount, while the strain rate hardening effect and the temperature softening effect are described respectively with and .
The temperature weakening effect coefficient formula is defined as: (5) Taking the melting temperature of concrete material as 1273K (1000℃), and the reference temperature (the room temperature is 16 ℃ in the tests) as 289K.
(Engineering Structures, 2002, 24: 597-611) [2] Nan Jianlin, Guo Zhenhai, Shi Xudong: Temperature stress coupling constitutive relationship of concrete (Journal of Tsinghua University(Science and Technology). 1997,37 (6):87-90) [3] NING Jianguo, SHANG Lin, SUN Yuanxiang: The developments of dynamic constitutive behavior of concrete (Advances in Mechanics. 2006.36(3):389-405) [4] Jia Bin, Tao Junlin, Li Zhengliang, Wang Ruheng, Zhang Yu: Effects of Temperature and Strain Rate on Dynamic Properties of Concrete (Transactions of Tianjin University, 2008, 14 (Suppl ): 511-513) [5] Dong Yuli, Xie Heping, Li Sniping: Continuum damage mechanics constitutive model of concrete under compression (ENGINEERING MECHANICS, 1996, 13(1):44-53)
High-temperature SHPB tests of concrete The specific information about the specimen-making and the test methods is described in document [4], in the tests, the impact velocity of the bullet are designed to be 5m/s, 7m/s and 12m/s, and the preset heating temperature are respectively the normal temperature(16℃), 200℃, 350℃, 500℃ and 650℃, namely, a total of 15 kinds of working conditions, considering the discreteness of the concrete materials and the complexity of the tests, each working condition completes testing of 8 to 12 specimens.
Meanwhile, to facilitate the analysis on the physical properties of materials, in allusion to the intercoupling between the strain rate hardening effect and the temperature softening effect, two mutually independent influence factors are set, denoting with and respectively, thus the stress-strain curves of concrete can be uniformly expressed as: (1) Where denotes the initial elastic modulus of the material, denotes the damage amount, and , obviously, the non-linear behaviors of the stress-strain curves are described completely with the damage amount, while the strain rate hardening effect and the temperature softening effect are described respectively with and .
The temperature weakening effect coefficient formula is defined as: (5) Taking the melting temperature of concrete material as 1273K (1000℃), and the reference temperature (the room temperature is 16 ℃ in the tests) as 289K.
(Engineering Structures, 2002, 24: 597-611) [2] Nan Jianlin, Guo Zhenhai, Shi Xudong: Temperature stress coupling constitutive relationship of concrete (Journal of Tsinghua University(Science and Technology). 1997,37 (6):87-90) [3] NING Jianguo, SHANG Lin, SUN Yuanxiang: The developments of dynamic constitutive behavior of concrete (Advances in Mechanics. 2006.36(3):389-405) [4] Jia Bin, Tao Junlin, Li Zhengliang, Wang Ruheng, Zhang Yu: Effects of Temperature and Strain Rate on Dynamic Properties of Concrete (Transactions of Tianjin University, 2008, 14 (Suppl ): 511-513) [5] Dong Yuli, Xie Heping, Li Sniping: Continuum damage mechanics constitutive model of concrete under compression (ENGINEERING MECHANICS, 1996, 13(1):44-53)