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Online since: May 2012
Authors: Kuang Chih Pei, Hsuan Chih Yang, Yu Cheng Kan
Consequently, improvement of building a containment structure, including the construction material and design, becomes more significant for researcher and engineer.
Testing Program Materials.
Fig. 6 Toughness of FHC versus steel fiber fraction Fig. 7 Toughness of FNC versus steel fiber fraction Fig. 8 Typical load-displacement curves of heavy concrete with various steel fiber fractions Conclusions The design and construction materials of nuclear facilities concern not only strength but also shielding capacity that prevents radiation leakage.
Acknowledgement This research work is completed under the support, with the grant no. of NSC 89-2211-E-324-023, from National Science Foundation, which is sincerely grateful.
Chang, 2004, March, “Strength and Fracture Toughness of Heavy Concrete with Various Iron Aggregate Inclusions,” Journal of Nuclear Engineering Design, Vol.228, pp.119-127
Testing Program Materials.
Fig. 6 Toughness of FHC versus steel fiber fraction Fig. 7 Toughness of FNC versus steel fiber fraction Fig. 8 Typical load-displacement curves of heavy concrete with various steel fiber fractions Conclusions The design and construction materials of nuclear facilities concern not only strength but also shielding capacity that prevents radiation leakage.
Acknowledgement This research work is completed under the support, with the grant no. of NSC 89-2211-E-324-023, from National Science Foundation, which is sincerely grateful.
Chang, 2004, March, “Strength and Fracture Toughness of Heavy Concrete with Various Iron Aggregate Inclusions,” Journal of Nuclear Engineering Design, Vol.228, pp.119-127
Online since: December 2011
Authors: Tao Deng, Tao Ge
Resistance of penetration
The equation of motion for materials in the pulverized zone is described in a spherical polar coordinate as
(6)
Where is the initial density, is the radial velocity of the particle, andare radial and lateral components of stress tensor respectively.
The state of materials near the penetration can be modeled by the Mohr-Coulomb criterion, as follows: , (7) Where is cohesion; When ,, the equation (7) can transfer to Tresca-Venant criterion.
When, equation (8a) becomes: (8b) Since the exact dynamic condition in the cracked zone has a slightly influence on the final solution, the inertial effect of the material in the cracking zone is neglected.
Chinese Journal of Rock Mechanics and Engineering Vol.24 No.16:pp:2859-2863.(2005) (in Chinese)
Nanjing: Press of PLA University of Science and Technology pp:238-246. (2005) (in Chinese) [7] WANG Ming-yang, GE Tao, WANG Li-yun.
The state of materials near the penetration can be modeled by the Mohr-Coulomb criterion, as follows: , (7) Where is cohesion; When ,, the equation (7) can transfer to Tresca-Venant criterion.
When, equation (8a) becomes: (8b) Since the exact dynamic condition in the cracked zone has a slightly influence on the final solution, the inertial effect of the material in the cracking zone is neglected.
Chinese Journal of Rock Mechanics and Engineering Vol.24 No.16:pp:2859-2863.(2005) (in Chinese)
Nanjing: Press of PLA University of Science and Technology pp:238-246. (2005) (in Chinese) [7] WANG Ming-yang, GE Tao, WANG Li-yun.
Online since: April 2014
Authors: Ji Hong Hu, Xiu Cai Li
Design and Numerical Simulation on
Concrete two-way Slab Strengthened with partially Bonded Steel Plate
HU Jihong1,2, a LI Xiucai2,b
1 School of Science, Wuhan University of Technology, Wuhan 430070, China)
2 Design and Research institute, Wuhan University of Technology, Wuhan 430070, China)
ahujh11@sina.com, b271516860@qq.com
Keywords: partially bonded steel , strengthen design, strength, stiffness, the numerical simulation
Abstract.
According the hotel owner requirements, give up the lightweight plasterboard as partition wall material, and after comprehensive comparison, choose calcium silicon plate as guest room partition wall material whose density is 90 kilograms per square meter; and choose aerated concrete as toilet room partition wall material .
Bond steel strengthening slab numerical simulation Material properties and parameter.
Concrete is complex building material and can be simulate by solid65 element which is hexahedral unit at eight notes.
References [1] Zhang Jiwen ;Teng Jinguang; Lv Zhitao; Huang Yulong The Behavior Two-way Reinfoced Concrete Slabs Externally Strengthened With Steel Plate To Subject Patch Load (China Civil engineering Journal, China 2002.04 p20~25) [2] Design Code for Strengthening Reinforce Concrete Structures (GB50367-2006) (China Building Industry Press, China ,2006) [3] Code for Design of Concrete Structures (GB50010-2010).
According the hotel owner requirements, give up the lightweight plasterboard as partition wall material, and after comprehensive comparison, choose calcium silicon plate as guest room partition wall material whose density is 90 kilograms per square meter; and choose aerated concrete as toilet room partition wall material .
Bond steel strengthening slab numerical simulation Material properties and parameter.
Concrete is complex building material and can be simulate by solid65 element which is hexahedral unit at eight notes.
References [1] Zhang Jiwen ;Teng Jinguang; Lv Zhitao; Huang Yulong The Behavior Two-way Reinfoced Concrete Slabs Externally Strengthened With Steel Plate To Subject Patch Load (China Civil engineering Journal, China 2002.04 p20~25) [2] Design Code for Strengthening Reinforce Concrete Structures (GB50367-2006) (China Building Industry Press, China ,2006) [3] Code for Design of Concrete Structures (GB50010-2010).
Online since: April 2014
Authors: Hui Min Cui
Environmental landscape design of residential refers to the environmental landscape design of residential building; its elements are the material elements and spiritual elements.
As the main living area, people have a material and spiritual demand for residential environment [3].
Green quantity stereo greening can not only increase the living area, soften the building straight lines, so that the building and greenbelt form a natural transition, but also can reduce the roof, wall materials, thermal radiation, reducing the heat island effect local, improve residential microclimate, roof greening as in building insulation building top surface increases, can reduce the top floor indoor temperature, environmental protection and energy saving effect of ecology.
Journal of Architecture, Vol.8 (2010), p.9-11 [2] K.
Science and Technology Information, Vol.13 (2011), p.362-363 [3] G.
As the main living area, people have a material and spiritual demand for residential environment [3].
Green quantity stereo greening can not only increase the living area, soften the building straight lines, so that the building and greenbelt form a natural transition, but also can reduce the roof, wall materials, thermal radiation, reducing the heat island effect local, improve residential microclimate, roof greening as in building insulation building top surface increases, can reduce the top floor indoor temperature, environmental protection and energy saving effect of ecology.
Journal of Architecture, Vol.8 (2010), p.9-11 [2] K.
Science and Technology Information, Vol.13 (2011), p.362-363 [3] G.
Online since: June 2013
Authors: Jumril Yunas, Yeop Majlis Burhanuddin, Eka Pawinanto Roer
The parasitic influences of the material become dominant and cause an increase of the skin, proximity and eddy current effects.
Magnetic induction will be created in the material of the secondary coil via the electromagnetic coupling.
The isolation material used in this experiment is the SOG (Spin On Glass) solution (from Honeywell).
Thick aluminum is used as conductor material which is deposited using vacuum evaporation method.
Arshak, “Development of high frequency coreless transformer using thick film polymer technology”, Microelectronics Journal, Vol 30, 1999
Magnetic induction will be created in the material of the secondary coil via the electromagnetic coupling.
The isolation material used in this experiment is the SOG (Spin On Glass) solution (from Honeywell).
Thick aluminum is used as conductor material which is deposited using vacuum evaporation method.
Arshak, “Development of high frequency coreless transformer using thick film polymer technology”, Microelectronics Journal, Vol 30, 1999
Online since: August 2013
Authors: Zhong Qiang Tan, Ming Yan Zhao, Shi Jiao Wang
Use and to represent the amount of deformation of the positioning part and limit stop respectively, the distance r becomes:
(12)
According to elasticity mechanics, when the temperature increases from to , the total amount of deformation of the positioning part is:
(13)
Wherein P is the axial force exerted on the positioning part, is elastic modulus of the positioning part, is cross-sectional area of the positioning part, is the thermal expansion coefficient of material.
According to mechanics of materials, when the free end of cantilever beam is enforced by concentrated load, the maximum deflection of the free end is: (14) The formula (12) is rewritten as: (15) Using reliability analysis FOSM method, the mean and variance of the performance function Z are as follows: (16)(17) By plugging (16),(17) into (10),(11), reliability can be obtained.
Reliability calculation of the limit-locking mechanism Assumed that the design parameters are as follows: the respective component materials are assumed to be titanium alloy TC4, the elastic modulus is 206GPa, coefficient of variation is 0.1; thermal coefficient of linear expansion is; influence coefficient is ;, coefficient of variation is 0.1; the length of the positioning part is , cross-sectional area is;the diameter of the projection is ; the diameter of the lock-sliding pin’s big end is; the pin hole diameter is ; the chute diameter is ;the distance between pin hole mounting projection and limit stop is ; the length of limit stop is , inertia moment of limit stop is, room temperature is , temperature range is:.
The Development Status and Application of Spacecarft Verification and Test Standards[J].Chinese Space Science and Technology,2004(12):25-31.
(In Chinese) [10] Chen Jianjun,Chen Yong.Reliability analysis and simulation for kinematics accuracy of the flat four-bar mechanism[J].Journal of xidian university,2001,28(6):759-763.
According to mechanics of materials, when the free end of cantilever beam is enforced by concentrated load, the maximum deflection of the free end is: (14) The formula (12) is rewritten as: (15) Using reliability analysis FOSM method, the mean and variance of the performance function Z are as follows: (16)(17) By plugging (16),(17) into (10),(11), reliability can be obtained.
Reliability calculation of the limit-locking mechanism Assumed that the design parameters are as follows: the respective component materials are assumed to be titanium alloy TC4, the elastic modulus is 206GPa, coefficient of variation is 0.1; thermal coefficient of linear expansion is; influence coefficient is ;, coefficient of variation is 0.1; the length of the positioning part is , cross-sectional area is;the diameter of the projection is ; the diameter of the lock-sliding pin’s big end is; the pin hole diameter is ; the chute diameter is ;the distance between pin hole mounting projection and limit stop is ; the length of limit stop is , inertia moment of limit stop is, room temperature is , temperature range is:.
The Development Status and Application of Spacecarft Verification and Test Standards[J].Chinese Space Science and Technology,2004(12):25-31.
(In Chinese) [10] Chen Jianjun,Chen Yong.Reliability analysis and simulation for kinematics accuracy of the flat four-bar mechanism[J].Journal of xidian university,2001,28(6):759-763.
Online since: November 2015
Authors: Sivamani Seralathan, T. Mohan, A. Sudheer Kumar, T. Micha Premkumar
The cost of this type of wind turbine heavily relies on the blade design and material selection and hence optimised design and proper selection of materials are required for reducing the cost.
Premkumar, Dhiman Chatterjee, Numerical study of Turbulent flow over a ‘S’- shaped hydrofoil, Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science, 222 (2007) 1717-1734
Thulasi ram, Numerical Analysis of Wells turbine, Applied Mechanics and Materials 592-594 (2014) 1125–1129
Premkumar, Dhiman Chatterjee, Numerical study of Turbulent flow over a ‘S’- shaped hydrofoil, Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science, 222 (2007) 1717-1734
Thulasi ram, Numerical Analysis of Wells turbine, Applied Mechanics and Materials 592-594 (2014) 1125–1129
Online since: March 2014
Authors: Jie Huang, Yong Gang Kang, Guo Rong Yang, Jing Hang Zhu
The total static deflection at node (k, n) is calculated by the superposition of all the deflections produced by the possible nodal forces:
(3)
Fig. 2 Modelling of the peripheral milling of thin-walled workpiece using ABAQUS
As shown in Fig.2, a deflection analysis model for the peripheral milling of thin-walled workpiece using ABAQUS is developed, which include the cutting loads defining, material removing, the iterative algorithm carrying out, the result data automatically picking and mapping.
The material is removed by boolean calculation of workpiece and cutting tool following the cutting path feed by feed.
The workpiece material is Al7075-T6, which are extensively used for low rigidity workpieces, e.g., jet engine compressor blades in aeronautical and aerospace industries.
Acknowledgments This project is supported by National Natural Science Foundation of China (Grant No. 51375396).
On cutter deflection surface errors in peripheral milling[J], Journal of Materials Processing Technology, 2012,212: 2443-2454
The material is removed by boolean calculation of workpiece and cutting tool following the cutting path feed by feed.
The workpiece material is Al7075-T6, which are extensively used for low rigidity workpieces, e.g., jet engine compressor blades in aeronautical and aerospace industries.
Acknowledgments This project is supported by National Natural Science Foundation of China (Grant No. 51375396).
On cutter deflection surface errors in peripheral milling[J], Journal of Materials Processing Technology, 2012,212: 2443-2454
Online since: September 2015
Authors: S.C. Sharma, Srinivasan Nagapriya, H. Sreemoolanadhan, M.R. Ajith, Mariamma Mathew
Hydrophobic silica aerogels by ambient pressure drying
S Nagapriya*, M R Ajith, H Sreemoolanadhanb,
Mariamma Mathew, S C Sharma
Materials & Metallurgy Group, Vikram Sarabhai Space Centre, Trivandrum, 695022, India
*priyakvk@gmail.com, s_nagapriya@vssc.gov.in
Keywords: sol-gel, aerogel, ambient pressure drying
Abstract.
Introduction Silica aerogels are low density, low thermal conductivity materials which have pore size in the range 1-60nm.
Figure 1: Granular silica aerogel Results and Discussions Hydrolysis of sol in presence of NH4F [[2] Brinker & Scherer, Sol-Gel Science: The Physics and Chemistry of Sol-Gel Processing, Academic Press, 1990 ] is as given by Eq.-1.
This drastically decreases the gelation time [[3] Rao et al, Rapid reduction in gelation time and impregnation of hydrophobic property in the tetraethoxysilane based silica aerogels using NH4F catalyzed single step sol–gel process, Journal of Alloys and Compounds 480 (2009) 689–695 ]
Pore volume & pore size were calculated to be 6 cm3/g & 30-50 nm respectively which establishes the material as ‘mesoporous’.
Introduction Silica aerogels are low density, low thermal conductivity materials which have pore size in the range 1-60nm.
Figure 1: Granular silica aerogel Results and Discussions Hydrolysis of sol in presence of NH4F [[2] Brinker & Scherer, Sol-Gel Science: The Physics and Chemistry of Sol-Gel Processing, Academic Press, 1990 ] is as given by Eq.-1.
This drastically decreases the gelation time [[3] Rao et al, Rapid reduction in gelation time and impregnation of hydrophobic property in the tetraethoxysilane based silica aerogels using NH4F catalyzed single step sol–gel process, Journal of Alloys and Compounds 480 (2009) 689–695 ]
Pore volume & pore size were calculated to be 6 cm3/g & 30-50 nm respectively which establishes the material as ‘mesoporous’.
Online since: June 2018
Authors: Raghuvir Singh, Charu Singh, S.K. Tiwari
Being lightest green materials, Mg alloys are potential candidates for automotive and aerospace sectors.
Tiwari, and Raghuvir Singh, Establishing environment friendly surface treatment for AZ91 magnesium alloy for subsequent electroless nickel coating, Journal of The Electrochemical Society, 165 (2) (2018) C71-C85
E., Luan, B., and Huntington, L., The influence of surface microchemistry in protective film formation on multi-phase magnesium alloys‖, Applied Surface Science, 254, (2008) pp.2871-2877
Paśko, The influence of heat treatment on the microstructure of GA8 magnesium alloy, J. of Material and Manufacturing Engineering, 20 (2007) 131-134
[10] Chye Lih.T, M.Z.M.Zamzuri, S.Norbahiyah , K.A.Ismail, M.N.B.Derman and S.Illias, Effect of Heat Treatment on Microstructure and Corrosion Behavior of AZ91d Magnesium Alloy, Advanced Materials Research, 685 (2013) pp 102-106
Tiwari, and Raghuvir Singh, Establishing environment friendly surface treatment for AZ91 magnesium alloy for subsequent electroless nickel coating, Journal of The Electrochemical Society, 165 (2) (2018) C71-C85
E., Luan, B., and Huntington, L., The influence of surface microchemistry in protective film formation on multi-phase magnesium alloys‖, Applied Surface Science, 254, (2008) pp.2871-2877
Paśko, The influence of heat treatment on the microstructure of GA8 magnesium alloy, J. of Material and Manufacturing Engineering, 20 (2007) 131-134
[10] Chye Lih.T, M.Z.M.Zamzuri, S.Norbahiyah , K.A.Ismail, M.N.B.Derman and S.Illias, Effect of Heat Treatment on Microstructure and Corrosion Behavior of AZ91d Magnesium Alloy, Advanced Materials Research, 685 (2013) pp 102-106