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Online since: August 2014
Authors: Bao Niu Zhou, Qiu Hong Wang, Ling Wang, Yu Qing Chen
For a long time, it was unavailable to realize continuous automatic processing, which seriously affected the processing efficiency and quality, etc.
Since the machining efficiency is influenced by those factors, it is possible that the machine cannot keep continuously working, etc.
From inside the machine, we needed to deal with the workpiece position and motion, the weight and the shape of the works, the relative positions between the workpiece and cutting tools, geometry and position accuracy, dynamic and static mechanical properties, thermal deformation of coupling, etc..
From the external factors we needed to consider the overall machine tool model and the man-machine relationship, etc., and with a bottom-up and top-down design method of interlock we finished the overall design with compact structure, reasonable, beautiful shape, control, maintenance and convenient online linking shown in Fig. 3.
The design has been put into production, and can be used as a model for advanced manufacturing systems, showing the distinctive characteristics. 8.1 the general machine, developed according to typical solutions of parts CNC machining technology, the workpiece by the time the fixture, could complete turning, milling, drilling, reaming, tapping and other complex machining processes with high-speed and had high efficiency, high-precision, high-end CNC machine properties.
Since the machining efficiency is influenced by those factors, it is possible that the machine cannot keep continuously working, etc.
From inside the machine, we needed to deal with the workpiece position and motion, the weight and the shape of the works, the relative positions between the workpiece and cutting tools, geometry and position accuracy, dynamic and static mechanical properties, thermal deformation of coupling, etc..
From the external factors we needed to consider the overall machine tool model and the man-machine relationship, etc., and with a bottom-up and top-down design method of interlock we finished the overall design with compact structure, reasonable, beautiful shape, control, maintenance and convenient online linking shown in Fig. 3.
The design has been put into production, and can be used as a model for advanced manufacturing systems, showing the distinctive characteristics. 8.1 the general machine, developed according to typical solutions of parts CNC machining technology, the workpiece by the time the fixture, could complete turning, milling, drilling, reaming, tapping and other complex machining processes with high-speed and had high efficiency, high-precision, high-end CNC machine properties.
Online since: July 2013
Authors: Biswajit Basu, Van Nguyen Dinh
In this paper an overview about floating offshore wind turbines (FOWT) including operating conditions, property and applicability of the barge, tension-leg, and spar floating platforms is described.
Choosing a proper single FOWT concept should be based on site and operating conditions such as water depth, environmental conditions, distance to shore, and sea bed properties as depicted in Fig. 2a.
Different scenarios of progressive drifting of S-FOWTs that are closely spaced in a wind farm to minimize installation costs were investigated where the risk of each scenario, the effect of wind turbine arrangement in a wind farm and the safety factors to be used in the design of moorings were evaluated [24].
The structural models use 3-D FEM and the non-linear material properties include hysteretic material description.
The wind turbulence does not affect the dynamic motion and structural responses significantly.
Choosing a proper single FOWT concept should be based on site and operating conditions such as water depth, environmental conditions, distance to shore, and sea bed properties as depicted in Fig. 2a.
Different scenarios of progressive drifting of S-FOWTs that are closely spaced in a wind farm to minimize installation costs were investigated where the risk of each scenario, the effect of wind turbine arrangement in a wind farm and the safety factors to be used in the design of moorings were evaluated [24].
The structural models use 3-D FEM and the non-linear material properties include hysteretic material description.
The wind turbulence does not affect the dynamic motion and structural responses significantly.
Online since: December 2009
Authors: B. Carcel, A.C. Carcel, P. Arrué
Mechanical behaviour of metal foams at room temperature has been widely studied for years and
some reviews and books give an excellent overview [1-3], including appropriated models to
estimate the properties of the foam.
Other structural factors not previously considered would also affect the creep behaviour of the foam.
Other factors, such as the cell wall curvature or random cell structure seem to have a lower influence on the creep rates [13].
Cellular solids Structure and properties Cambridge Solid State Science Series.
Other structural factors not previously considered would also affect the creep behaviour of the foam.
Other factors, such as the cell wall curvature or random cell structure seem to have a lower influence on the creep rates [13].
Cellular solids Structure and properties Cambridge Solid State Science Series.
Online since: November 2013
Authors: Hong Ke Wang, Sen Dong Gu, Qiu Hong Quan, Wen Fei Shen, Liwen Zhang
Industrial manufacturing and processing of GH80A components is most frequently carried out by deformation at high temperature, the dynamic recrystallization (DRX) behavior of workpiece during hot deformation affects the macroscopic characteristics, which determines the final mechanical properties of the product.
Consequently, as a temperature compensated strain rate factor, The Zener-Hollomon parameter is introduced to characterize the combined effect of strain rate and temperature on the deformation process [8]: (1) where Q is the activation energy of DRX (KJ/mol), is strain rate, T is absolute temperature and R is the universal gas constant.
Consequently, as a temperature compensated strain rate factor, The Zener-Hollomon parameter is introduced to characterize the combined effect of strain rate and temperature on the deformation process [8]: (1) where Q is the activation energy of DRX (KJ/mol), is strain rate, T is absolute temperature and R is the universal gas constant.
Online since: December 2007
Authors: Gianni Nicoletto, Radomila Konečná, P. Baicchi, V. Majerová
The mechanical properties of Al-Si alloys
can be controlled by small addition of Mg or Cu and then strengthened by a precipitation hardening
treatment that forms Mg2Si or Al2Cu phases.
Surface inspection of failed specimens and comparison with test results from the literature [3,4] allowed concluding that shrinkage porosity was the dominating factor controlling the fatigue performance of the present AlSi7Mg alloys produced with the sand cast process.
Pore size characterization Pores affect directly the fatigue life because they act as stress concentrators: Fig. 2 shows the elastic stress distribution around natural shrinkage porosity.
Surface inspection of failed specimens and comparison with test results from the literature [3,4] allowed concluding that shrinkage porosity was the dominating factor controlling the fatigue performance of the present AlSi7Mg alloys produced with the sand cast process.
Pore size characterization Pores affect directly the fatigue life because they act as stress concentrators: Fig. 2 shows the elastic stress distribution around natural shrinkage porosity.
Online since: May 2012
Authors: Miao Wu, Xue Di Hao, Chang Yong Gong, Ji Chang Guo, Hua Xu Yang
Pumping Characteristics of Calcium Carbide Waste Paste
Xuedi Hao1, a, Changyong Gong2 , Jichang Guo1 , Huaxu Yang1 , Miao Wu1,b
1 School of Mechanical Electronic & Information, China University of Mining & Technology (Beijing), Beijing 100083, China
2 China Center for Industrial Economic Security Research in Beijing Jiaotong University, Beijing 100044, China
ahxd2003@126.com, bwum@cumtb.edu.cn
Keywords: calcium carbide waste, pastes, pipeline transportation, solid pump
Abstract.
In addition to the arrangement of piping results in the larger delivery resistance in the front end of the pipeline, the flow characteristics of calcium carbide paste is a main factor for it.
(3) Pipe diameter affects the delivery resistance greatly, when the diameter decreases, the resistance increases rapidly.
Study on rheological properties and frictional resistance of pipeline transport high concentration and viscous materials [D].
In addition to the arrangement of piping results in the larger delivery resistance in the front end of the pipeline, the flow characteristics of calcium carbide paste is a main factor for it.
(3) Pipe diameter affects the delivery resistance greatly, when the diameter decreases, the resistance increases rapidly.
Study on rheological properties and frictional resistance of pipeline transport high concentration and viscous materials [D].
Online since: September 2014
Authors: Linda Giresini, Marco Andreini, Mauro Sassu, Anna de Falco
The case study is located in the city of Leghorn (Italy) where is a social housing center erected mainly in the ’60s (named “La Rosa”), containing about 1000 flats: it represents a typical Italian urban district based on pilotis r.c. buildings of several floors, clay units façades, affected by a high level of static and seismic vulnerability.
In total, there are 32 r.c. columns with cross section dimensions between 25 × 25 cm and 30 × 35 cm, with poor mechanical properties (as those related to C12/15 concrete [9]) and a high level of degradation (Fig. 2).
The expression proposed by the Eurocode [10] is , (2) where tj = 6 mm (thickness of the steel straps), b = 50 mm (width of the steel straps), dc = 1160 mm (length of the new steel grid), s = 300 mm (spacing of the steel straps), fyw = 275 N/mm2 (yield stress), a = 72 deg (inclination of compression force between two nodes) gM0 = 1.05 (partial safety factor).
In total, there are 32 r.c. columns with cross section dimensions between 25 × 25 cm and 30 × 35 cm, with poor mechanical properties (as those related to C12/15 concrete [9]) and a high level of degradation (Fig. 2).
The expression proposed by the Eurocode [10] is , (2) where tj = 6 mm (thickness of the steel straps), b = 50 mm (width of the steel straps), dc = 1160 mm (length of the new steel grid), s = 300 mm (spacing of the steel straps), fyw = 275 N/mm2 (yield stress), a = 72 deg (inclination of compression force between two nodes) gM0 = 1.05 (partial safety factor).
Online since: July 2024
Authors: Zu Jian Huang, Yang Zhao
The correlation is found to be affected by the construction types.
For all the four types of construction model groups, the curve similarity factors between the HRY-RHe and CWS model groups f2(HRY-CWS) of Hdehumid.sum and RHi.mean are 49.66-51.11 and 76.43-82.99, respectively, which are higher than the 38.47-40.45 and 60.43-65.11 of the f2(Meteo-CWS), and 41.28-46.66 and 60.05-65.12 of the f2(epw-CWS) (Fig. 3).
For the M/H groups, the moisture content of the exterior walls is more affected by the rainfall.
Experimental study on bamboo hygrothermal properties and the impact of bamboo-based panel process.
Assessment on bamboo scrimber as a substitute for timber in building envelope in tropical and humid subtropical climate zones - Part 1 hygrothermal properties test. 2017 International Conference on Building Materials and Materials Engineering, Lyon, France (2017)
For all the four types of construction model groups, the curve similarity factors between the HRY-RHe and CWS model groups f2(HRY-CWS) of Hdehumid.sum and RHi.mean are 49.66-51.11 and 76.43-82.99, respectively, which are higher than the 38.47-40.45 and 60.43-65.11 of the f2(Meteo-CWS), and 41.28-46.66 and 60.05-65.12 of the f2(epw-CWS) (Fig. 3).
For the M/H groups, the moisture content of the exterior walls is more affected by the rainfall.
Experimental study on bamboo hygrothermal properties and the impact of bamboo-based panel process.
Assessment on bamboo scrimber as a substitute for timber in building envelope in tropical and humid subtropical climate zones - Part 1 hygrothermal properties test. 2017 International Conference on Building Materials and Materials Engineering, Lyon, France (2017)
Online since: January 2012
Authors: M.S.J. Hashmi, O. Al-Mana, Bekir Sami Yilbas
Yilbas2,c
1 School of Mechanical and Manufacturing Eng., DCU, Dublin, Ireland
2 ME Department, KFUPM, Dhahran, Saudi Arabia.
They showed that dynamic factors played an important role in laser nitriding process.
The true modulus of elasticity can be determined using the indenter properties [10], i.e.: (2) where Ei and ni are the Young’s modulus and Poisson’s ratio of indenter, respectively.
As the depth below the surface increases further middle-like structure is formed, which is the indication of the heat affected zone.
They showed that dynamic factors played an important role in laser nitriding process.
The true modulus of elasticity can be determined using the indenter properties [10], i.e.: (2) where Ei and ni are the Young’s modulus and Poisson’s ratio of indenter, respectively.
As the depth below the surface increases further middle-like structure is formed, which is the indication of the heat affected zone.
Online since: November 2011
Authors: Wen Fang Li, Jun Du, Ming Hua Wang
It's well known that grain refinement is an effective route to improve the mechanical properties of magnesium alloys [4-5].
The elements of Fe and Mn in Mg-Al alloys were proved to be important factors to determine the refining efficiency of carbon inoculation.
For the sample treated by combined addition of Fe and Mn firstly and then carbon inoculation, the formation of Al4C3 was possibly affected by Al-Fe, Al-Mn intermetallic compounds,solute Fe, Mn.
The elements of Fe and Mn in Mg-Al alloys were proved to be important factors to determine the refining efficiency of carbon inoculation.
For the sample treated by combined addition of Fe and Mn firstly and then carbon inoculation, the formation of Al4C3 was possibly affected by Al-Fe, Al-Mn intermetallic compounds,solute Fe, Mn.