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Online since: December 2011
Authors: Cheng Zhu Jin
Although thus method will not affect the mechanical performance, there are still two distinct flaws : 1)the fixture force will be very little because of the less contact area.
Single factor simulation table level factors 1 2 3 4 5 Milling width /mm 9 18 27 36 45 Milling depth /mm 2 4 6 8 10 The rotating speed of spindle /104r·min-1 1 1.2 1.7 2 2.3 Feeding rate/ m·min-1 2 3 4 5 6 The laws of cutting parameters affecting the milling force are shown in Fig. 9 based on the FEM simulation.
Fig.9 The laws of cutting parameters affecting the milling force The failure of the fixation of thin NOMEX honeycomb is more serious than thick one during machining because of the low rigidity.
The factors affecting milling force distribution include honeycomb height, milling force and feeding position of tool on the honeycomb components.
Coupled Thermo-mechanical Model for Metal Orthogonal Cutting Process and Finite Element Simulation[J].
Single factor simulation table level factors 1 2 3 4 5 Milling width /mm 9 18 27 36 45 Milling depth /mm 2 4 6 8 10 The rotating speed of spindle /104r·min-1 1 1.2 1.7 2 2.3 Feeding rate/ m·min-1 2 3 4 5 6 The laws of cutting parameters affecting the milling force are shown in Fig. 9 based on the FEM simulation.
Fig.9 The laws of cutting parameters affecting the milling force The failure of the fixation of thin NOMEX honeycomb is more serious than thick one during machining because of the low rigidity.
The factors affecting milling force distribution include honeycomb height, milling force and feeding position of tool on the honeycomb components.
Coupled Thermo-mechanical Model for Metal Orthogonal Cutting Process and Finite Element Simulation[J].
Online since: December 2013
Authors: Katarina Monkova
One of the most important factors that affect the scanner choosing is the time of scanning and the size of the scanned object.
At the same time, it was essential to evenly apply the sprayed layer as this factor may also affects the approximation rate of a created model toward its original and a finite accuracy of the component created on the basis of a virtual 3D model.
In: Conference IMAP 2013, Presov, FVT TU, (2013), p. 6-10 [6] Spisak, E., Majernikova, J.: Analysis of variance of mechanical properties of sheets as the input parameters for simulation of processes, In: ActaMetallurgicaSlovaca, Vol.18, no.2-3, (2012) p. 109-116 [7] Kadnar M. et al.: The design and verification of experimental machine for real journal bearing testing, Technical Gazette, Vol. 18, no.1, (2011), p.95-98 [8] Gaspar, S. et al.: Dependence of Pressure Die Casting Quality on Die Casting Plunger Velocity Inside a Filling Chamber of a Pressure Die Casting Machine, In: Advanced Science Letters, Vol. 14, no. 1 (2012), p. 499-502
At the same time, it was essential to evenly apply the sprayed layer as this factor may also affects the approximation rate of a created model toward its original and a finite accuracy of the component created on the basis of a virtual 3D model.
In: Conference IMAP 2013, Presov, FVT TU, (2013), p. 6-10 [6] Spisak, E., Majernikova, J.: Analysis of variance of mechanical properties of sheets as the input parameters for simulation of processes, In: ActaMetallurgicaSlovaca, Vol.18, no.2-3, (2012) p. 109-116 [7] Kadnar M. et al.: The design and verification of experimental machine for real journal bearing testing, Technical Gazette, Vol. 18, no.1, (2011), p.95-98 [8] Gaspar, S. et al.: Dependence of Pressure Die Casting Quality on Die Casting Plunger Velocity Inside a Filling Chamber of a Pressure Die Casting Machine, In: Advanced Science Letters, Vol. 14, no. 1 (2012), p. 499-502
Online since: March 2013
Authors: Wei Shui Fei, Dong Ya Wang
The study proves that the accumulation of dowel looseness is the main factor which causes this special relation.
Caulking material performance aspects, in view of caulking material durability properties have been studied, and developed better durability, excellent performance of caulking materials, put forward under heavy traffic contraction joints shall be set dowel bar and other important suggested measures.
Joint seal failure factors [10] including: (1) the environmental factors (rain, sunshine, high temperature, hard and dirty content).
Joint sealant performance directly affects the normal use of the cement concrete pavement and its quality, then ensure joint sealant for excellent working performance to improve the use of cement concrete pavement performance and extend the life of pavement structure is very important, so in-depth understanding, analysis the mechanical properties of the concrete pavement joint caulking temperature contraction and traffic loads are necessary.
In the cement concrete pavement using period, joint sealant are mainly affected by both the tensile and shear.
Caulking material performance aspects, in view of caulking material durability properties have been studied, and developed better durability, excellent performance of caulking materials, put forward under heavy traffic contraction joints shall be set dowel bar and other important suggested measures.
Joint seal failure factors [10] including: (1) the environmental factors (rain, sunshine, high temperature, hard and dirty content).
Joint sealant performance directly affects the normal use of the cement concrete pavement and its quality, then ensure joint sealant for excellent working performance to improve the use of cement concrete pavement performance and extend the life of pavement structure is very important, so in-depth understanding, analysis the mechanical properties of the concrete pavement joint caulking temperature contraction and traffic loads are necessary.
In the cement concrete pavement using period, joint sealant are mainly affected by both the tensile and shear.
Online since: February 2007
Authors: Vladimir D. Krstić
Porosity Dependence of Young's Modulus
It is well known that the presence of pores strongly affects the elastic properties of brittle solids.
It has been shown experimentally [19] and theoretically [20] that the stress concentration due to the presence of pores and crack-pore interaction effects are the dominant factors controlling the elastic response of a porous solid.
Equation (7) and Fig. 4 also show that, for a given annular flaw size, a solid containing large a number of small pores will have the Young's modulus less affected by the presence of pores than a solid containing a small number of large pores.
Cubic ceramics are known to have isotropic elastic and thermal proper- ties, whereas non-cubic ceramics posses anisotropy in both elastic (E, ν) and thermal properties (α).
Soc. of Mechanical Engineer (1933), pp.5539
It has been shown experimentally [19] and theoretically [20] that the stress concentration due to the presence of pores and crack-pore interaction effects are the dominant factors controlling the elastic response of a porous solid.
Equation (7) and Fig. 4 also show that, for a given annular flaw size, a solid containing large a number of small pores will have the Young's modulus less affected by the presence of pores than a solid containing a small number of large pores.
Cubic ceramics are known to have isotropic elastic and thermal proper- ties, whereas non-cubic ceramics posses anisotropy in both elastic (E, ν) and thermal properties (α).
Soc. of Mechanical Engineer (1933), pp.5539
Online since: August 2010
Authors: Jiqiang Li, Lei Zhang, Xuan Pu Dong, Zhao Zhang, Wen Liu
School of Mechanical and Energy, Ningbo Institute of Technology, Zhejiang University, Ningbo
315100, China
2.
With their high specific strength and stiffness, good damping properties, excellent machinability and castability, magnesium alloys have been widely used in automotive, communication, electronics and aerospace industries[1~2].
Discussion Stirring temperature is considered one of the most important factors for slurry making.
The insensitivity of the shape factor of primary particles to the stirring time prolongation can be due to different reasons.
Further stirring will only accelerates ripening and affects the primary particle size.
With their high specific strength and stiffness, good damping properties, excellent machinability and castability, magnesium alloys have been widely used in automotive, communication, electronics and aerospace industries[1~2].
Discussion Stirring temperature is considered one of the most important factors for slurry making.
The insensitivity of the shape factor of primary particles to the stirring time prolongation can be due to different reasons.
Further stirring will only accelerates ripening and affects the primary particle size.
Online since: November 2007
Authors: Sarika Patel, Y. Hu, Uwe Gbureck, J.E. Barralet, Liam M. Grover
Several studies have been published which have
investigated the factors that influence the hydrolysis of brushite cements both in vitro [5] and in vivo
[6], including implant volume, liquid refreshment rate and media composition [5].
Here we report the influence of porosity on the mechanical and in vitro degradation properties of a brushite cement system.
Prior to mechanical testing, the beads were dissolved from the cement matrices by immersion in 10 mM trisodium citrate solution following which they were washed repeatedly in double distilled water.
A number of studies have been undertaken to elucidate the factors that can affect the hydrolysis reaction including, implant volume, media refreshment rate and media composition [8]. 3 CaHPO4.2H2O + 2 Ca 2+ � Ca5(PO4)3OH + 5H2O + 3 H + Equation 1 Some authors have attempted to prevent this reaction from occurring by the incorporation of salts capable of preventing hydroxyapatite formation including magnesium phosphates [5] and calcium pyrophosphate [5] into the cement.
Here we report the influence of porosity on the mechanical and in vitro degradation properties of a brushite cement system.
Prior to mechanical testing, the beads were dissolved from the cement matrices by immersion in 10 mM trisodium citrate solution following which they were washed repeatedly in double distilled water.
A number of studies have been undertaken to elucidate the factors that can affect the hydrolysis reaction including, implant volume, media refreshment rate and media composition [8]. 3 CaHPO4.2H2O + 2 Ca 2+ � Ca5(PO4)3OH + 5H2O + 3 H + Equation 1 Some authors have attempted to prevent this reaction from occurring by the incorporation of salts capable of preventing hydroxyapatite formation including magnesium phosphates [5] and calcium pyrophosphate [5] into the cement.
Online since: March 2008
Authors: Dun Wen Zuo, Min Wang, Guang Ming Jiao
When two or more
planners work together through Internet, their plans can affect on another and conflicts may arise.
Officially, the term "agent" is used to denote a software based computer system that enjoys the following properties, namely autonomy, co-operability, reactivity, pro-activity and mobility[5, 6].
It prepares the work schedule of job-shop based on task planning, tasks on line, resource bidding and adjusts the schedule according to the variation of these factors ● Resource DB stores and manages manufacturing resource information in job-shop, such as resource capabilities, machine maintenance planning, manpower information.
In the process of bidding for resource, the main factors or conditions such as Machine-sharing constraint, Machine-usage constraint, Workstation constraint, which could cause resource conflicts, are taken into account.
Cai: China Mechanical Engineering, Vol.14 (2003) No.22, pp.1942.
Officially, the term "agent" is used to denote a software based computer system that enjoys the following properties, namely autonomy, co-operability, reactivity, pro-activity and mobility[5, 6].
It prepares the work schedule of job-shop based on task planning, tasks on line, resource bidding and adjusts the schedule according to the variation of these factors ● Resource DB stores and manages manufacturing resource information in job-shop, such as resource capabilities, machine maintenance planning, manpower information.
In the process of bidding for resource, the main factors or conditions such as Machine-sharing constraint, Machine-usage constraint, Workstation constraint, which could cause resource conflicts, are taken into account.
Cai: China Mechanical Engineering, Vol.14 (2003) No.22, pp.1942.
Online since: October 2011
Authors: Bin Liu, Yan Wen, Na Li
Modeling and solving problems of heat transfer of cement clinker
Yan Wen1,a, Na Li2,b and Bin Liu3,c
1College of Mechanical Engineering, Yanshan University, Qinhuangdao, 066004, Hebei Province, China
2College of Mechanical Engineering, Yanshan University, Qinhuangdao, 066004, Hebei Province, China
3College of Electrical Engineering, Yanshan University, Qinhuangdao, 066004, Hebei Province, China
aemail: wywy0335@ysu.edu.cn, bemail: lina52641@126.com, cemail: liubin@ysu.edu.cn
Keywords: cement clinker; seepage heat transfer; model solution
Abstract.
Introduction Grate cooler is an important equipment of the cement firing system, its main task is to finish clinker’s transportation and cooling, and the cooling effect directly affect the quality of the cement clinker.
According to cement clinker having the porous media characteristics of packing particle, and considering the fluid properties and heat dispersion effect on heat transfer process, this project introduce porous media’s percolation heat transfer theory into researching of clinker’s heat transfer, and the control model of heat transfer process is built up.
Considering effect of the factors of the porous media’s convection, this project use continuity equation of percolation theory and heat transfer theory build up unit body’s mathematical model.
Considering the influence of temperature variation on gas, air density determined by the gas state equation: (3) In the upper formula, z is deviation factor; M is molecular weight of gas; R=8314 is gas universal constant.
Introduction Grate cooler is an important equipment of the cement firing system, its main task is to finish clinker’s transportation and cooling, and the cooling effect directly affect the quality of the cement clinker.
According to cement clinker having the porous media characteristics of packing particle, and considering the fluid properties and heat dispersion effect on heat transfer process, this project introduce porous media’s percolation heat transfer theory into researching of clinker’s heat transfer, and the control model of heat transfer process is built up.
Considering effect of the factors of the porous media’s convection, this project use continuity equation of percolation theory and heat transfer theory build up unit body’s mathematical model.
Considering the influence of temperature variation on gas, air density determined by the gas state equation: (3) In the upper formula, z is deviation factor; M is molecular weight of gas; R=8314 is gas universal constant.
Online since: January 2019
Authors: Jian Jun Wang, Li Hong Han, Guang Xi Liu, Shang Yu Yang
As a result, the bridge plug can not be seated in place, which will affect the fracturing construction effect and reduce the single well productivity.
With the model, the relationship between load spectrum and casing and cement’s physical/mechanical parameters was discussed.
C[7], G.Landry[8], R.Blake[9] considering the integrity of the wellbore system, the influence relationship between shale gas well complex fracture crack propagation and the circumferential stress of wellbore was discussed, meanwhile, they thought reservoir rocks creep properties was the main reason caused casing failure.
To sum up, experts and scholars at home and abroad have studied the deformation characteristics of high steel casing with the non-uniform external extrusion load by the method of finite element method, and the influencing factors were also analyzed.
By combining the elastic mechanics theory with the complex variable function method, the high steel grade casing stress distribution influence factors were intensive studied, such as: lithologic inhomogeneous extrusion, the difference between reservoir rock stiffness and the cement stiffness, and ground stress inhomogeneity.
With the model, the relationship between load spectrum and casing and cement’s physical/mechanical parameters was discussed.
C[7], G.Landry[8], R.Blake[9] considering the integrity of the wellbore system, the influence relationship between shale gas well complex fracture crack propagation and the circumferential stress of wellbore was discussed, meanwhile, they thought reservoir rocks creep properties was the main reason caused casing failure.
To sum up, experts and scholars at home and abroad have studied the deformation characteristics of high steel casing with the non-uniform external extrusion load by the method of finite element method, and the influencing factors were also analyzed.
By combining the elastic mechanics theory with the complex variable function method, the high steel grade casing stress distribution influence factors were intensive studied, such as: lithologic inhomogeneous extrusion, the difference between reservoir rock stiffness and the cement stiffness, and ground stress inhomogeneity.
Online since: December 2007
Authors: Christophe Déprés, Christian F. Robertson, Marc Fivel
The Effect of Mean Stress and Thermo-mechanical Induced Stress on
Micro-crack Initiation: An Analysis based on Experiments and
DD Simulation Results
C.F.
These experiments help in investigating the role of two distinct factors on micro-crack initiation: i- the role of the thermo-mechanical induced stress state, ii- the role of a positive uni-axial mean stress.
It is therefore assumed that temperature does not affect the interpretation of the results.
Surface grains are represented by appropriate properties of the boundaries [1].
Micro-cracks preferentially initiate in grains having a surface normal close to the <110> directions, where the thermo-mechanical induced stress state is equi-biaxial.
These experiments help in investigating the role of two distinct factors on micro-crack initiation: i- the role of the thermo-mechanical induced stress state, ii- the role of a positive uni-axial mean stress.
It is therefore assumed that temperature does not affect the interpretation of the results.
Surface grains are represented by appropriate properties of the boundaries [1].
Micro-cracks preferentially initiate in grains having a surface normal close to the <110> directions, where the thermo-mechanical induced stress state is equi-biaxial.