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Online since: June 2014
Authors: Jing Liu, Jing Tao Han, Xiao Xiong Wang, Qian Liu
This paper also includes the blanking mechanicals.
The factors influencing the quality of shear edge and dimensional accuracy for two blanking processes mainly include blank material style and thickness, tool geometry and wear condition, punch-die clearance and friction, etc.
It is conclude that the performance of punch used in rotary blanking mainly depends on mechanical properties of materials, such as the bending resistance and fracture toughness.
Due to the application of polyurethane pad, the deflection around the hole perimeter appears and affects product quality.
Reszka: International Journal of Mechanical Science, Vol. 44 (2002), p.1394 [9] A.M.
The factors influencing the quality of shear edge and dimensional accuracy for two blanking processes mainly include blank material style and thickness, tool geometry and wear condition, punch-die clearance and friction, etc.
It is conclude that the performance of punch used in rotary blanking mainly depends on mechanical properties of materials, such as the bending resistance and fracture toughness.
Due to the application of polyurethane pad, the deflection around the hole perimeter appears and affects product quality.
Reszka: International Journal of Mechanical Science, Vol. 44 (2002), p.1394 [9] A.M.
Online since: November 2016
Authors: Christof Sommitsch, Majid Reza Ayatollahi, Christian Moser, Nima Razavi
., Centre of Excellence in Experimental Solid Mechanic and Dynamics, School of Mechanical Engineering, Iran University of Science and Technology, Narmak, 16846, Tehran, Iran.
2Institute of Materials Science and Welding, Kopernikusgasse 24/I, A-8010 Graz, Austria.
3Institute of Lightweight Design, Inffeldgasse 25d, A-8010 Graz, Austria.
Drilling holes in the vicinity of the crack tip turns the crack into a notch and reduces the crack tip stress intensity factor.
The distance between the hole centers is considered as the main parameter affecting the efficiency of this method.
Mechanical properties of high strength steel S690 [13].
The distance between the hole centers (2d) was considered as major parameter affecting the efficiency of this method.
Drilling holes in the vicinity of the crack tip turns the crack into a notch and reduces the crack tip stress intensity factor.
The distance between the hole centers is considered as the main parameter affecting the efficiency of this method.
Mechanical properties of high strength steel S690 [13].
The distance between the hole centers (2d) was considered as major parameter affecting the efficiency of this method.
Online since: August 2016
Authors: Sylma Carvalho Maestrelli, Rodrigo Fernando Costa Marques, Marília Zani Minucci, Maria Gabriela Nogueira Campos, T.N. Gondim, R.S. Fernandes
The addition of 30% or more of starch reduced the mechanical resistance of samples which limited their use.
The obtaining of porous materials through starch consolidation is a directly consolidated technique based on the properties of gel formation of the starch in the presence of water, making possible its use as a conforming and main element to make pores [5].
In addition, the specimens showed low resistance, which could adversely affect the processes of bone integration in implants.
The ceramic pieces of β-TCP in the concentration of 30 and 40% of potato starch (Fig. 3 (c) and (d)) showed large amount of distributed pores with small diameter and low mechanical strength, both poor factors in the case of bone integration process for bone implants.
The parts containing 30 and 40% of corn and potato starches exhibited low resistance to handling due to the high porosity, besides small pores (about 10μm and 60μm), which could adversely affect bone formation.
The obtaining of porous materials through starch consolidation is a directly consolidated technique based on the properties of gel formation of the starch in the presence of water, making possible its use as a conforming and main element to make pores [5].
In addition, the specimens showed low resistance, which could adversely affect the processes of bone integration in implants.
The ceramic pieces of β-TCP in the concentration of 30 and 40% of potato starch (Fig. 3 (c) and (d)) showed large amount of distributed pores with small diameter and low mechanical strength, both poor factors in the case of bone integration process for bone implants.
The parts containing 30 and 40% of corn and potato starches exhibited low resistance to handling due to the high porosity, besides small pores (about 10μm and 60μm), which could adversely affect bone formation.
Online since: January 2014
Authors: Zhong De Shan, Yong Sheng Ye, Bao Yu Wang, Chao Jiang, Bai Liang Zhuang
Table 1 Composition analysis of the steels (wt%) and performance data [8]
Hardness
Material
Component
300℃
300℃
300℃
20~650℃
C
Cr
Mn
V
Si
Mo
σs(MPa)
Ak(J)
YG(HV)
KP(grade)
47~48HRC
4Cr5MoSiV1
0.42
5.19
0.42
1.01
0.99
1.64
1251
41.1
454.5
11.4
To quantify the performance of a hot-stamping die, we selected σs, AK, YG, and KP as its evaluation indices, since die failure is mainly caused by wear, and hardness is the most important factor affecting wear.
The weight factor wYG = 0.35 during a production cycle.
Thus, the weight factors in Eq.3 were wss:wAK:wYG:wKP=0.2:0.2:0.35:0.25, and hss = hAK = hYG = 0, hKP = 1.
[8] Zhu Zongyuan. property data collection of common hot working die steels used in china(XI)[J].
Mechanical engineering materials,2001,25(12):36-40.
The weight factor wYG = 0.35 during a production cycle.
Thus, the weight factors in Eq.3 were wss:wAK:wYG:wKP=0.2:0.2:0.35:0.25, and hss = hAK = hYG = 0, hKP = 1.
[8] Zhu Zongyuan. property data collection of common hot working die steels used in china(XI)[J].
Mechanical engineering materials,2001,25(12):36-40.
Online since: April 2016
Authors: Adam Barylski, Norbert Piotrowski
Lapping is a very complicated and random process with the main outcomes, such as stock removal, roughness and flatness, as a result of numerous variables affecting the process quality.
It can be observed that grain E does not stick to the affecting partner and remains passive.
All the factors which influence lapping process are related of time.
Changes of factors as velocities, pressure or properties of the abrasive during machining can be repeatable and predictable.
However, some of factors can change random.
It can be observed that grain E does not stick to the affecting partner and remains passive.
All the factors which influence lapping process are related of time.
Changes of factors as velocities, pressure or properties of the abrasive during machining can be repeatable and predictable.
However, some of factors can change random.
Online since: December 2010
Authors: Bai Sheng Rong, Wei Liang Guo, Zhi Jun Dong, Zuo Hua Li, Jun Teng
The influences of main structure lateral stiffness related factors on the plasticity developing process are researched.
A plastic shear cross section is defined to consider the plastic shear properties of the component.
The order of the factors impacts is inclined column cross section the largest, wall thickness second and coupling beam height the smallest.
Fig.11 shows the factor influences on the structure plastic story drifts, where enlarging the factors can increase the structure lateral stiffness and decrease the structure story drift.
The order of the factors impacts is coupling beam height the largest, inclined column cross section secondary and wall thickness the smallest.
A plastic shear cross section is defined to consider the plastic shear properties of the component.
The order of the factors impacts is inclined column cross section the largest, wall thickness second and coupling beam height the smallest.
Fig.11 shows the factor influences on the structure plastic story drifts, where enlarging the factors can increase the structure lateral stiffness and decrease the structure story drift.
The order of the factors impacts is coupling beam height the largest, inclined column cross section secondary and wall thickness the smallest.
Online since: December 2011
Authors: Dong Fang Li, Min Young Hwang, Yong Gyun Kim, Chung Hwan Jeon, Ju Hun Song, Yong Tae Kim, Youn Han Chang
It is also studied that 15% or more CO2 mol fraction could affect to proper formation of LiCoO2 through TGA-DSC analysis.
There are two kinds of factors which influence crystal structure and the one is temperature and the other is partial pressure of O2 and CO2, the product as is seen in the reaction formula.
A saga is made with porous ceramic material with 26% porosity, a heater is made with SIC heating element and inside of a calcination furnace was applied with firebrick properties.
Antolini, “LiCoO2:formation,structure,lithiumandoxygennonstoichiometry, electrochemical behavior and transport properties“ Solid state ionics 170(2004) [4] E.Plichta, M.
Bulhoes, " Structure and electrochemical properties of LiCoO2 prepared by combustion synthesis", Solid state Ionics, Vol. 158,91-102(2003) [11] C.
There are two kinds of factors which influence crystal structure and the one is temperature and the other is partial pressure of O2 and CO2, the product as is seen in the reaction formula.
A saga is made with porous ceramic material with 26% porosity, a heater is made with SIC heating element and inside of a calcination furnace was applied with firebrick properties.
Antolini, “LiCoO2:formation,structure,lithiumandoxygennonstoichiometry, electrochemical behavior and transport properties“ Solid state ionics 170(2004) [4] E.Plichta, M.
Bulhoes, " Structure and electrochemical properties of LiCoO2 prepared by combustion synthesis", Solid state Ionics, Vol. 158,91-102(2003) [11] C.
Online since: December 2014
Authors: Yong Xiang Wu, An Min Cai, Hong You Li, Hong Ming Chi, Li Yuan Liu, Hong Chao Ning
Offshore wind turbine supporting structure long term works in the harsh marine environment, suffering from a variety of negative factors such as the seawater corrosion, marine growths, water scour, collision of sea ice and ship, etc..
The study found that such adverse environmental factors might easily result in a whole or partial component damage of the foundation support structure, and eventually lead to the reduction of security and durability.
However, due to the complex environment at sea, the bracing structure of the offshore wind turbine set will be affected by various negative factors like seawater corrosion, marine growths, water scour, collision of sea ice and ship, etc., which causes damage to the supporting structure of the offshore wind turbine set and affects the security of the set.
The harm of marine environment to the supporting structure of the offshore wind turbine The supporting structure of the offshore wind turbine set not only bear the influence from wind, wave and current, but also bear the long-term influence of negative factors such as seawater corrosion, marine growths, water scour, collision of sea ice and ship, and so on.
The corrosion has serious influence on the mechanical property of the materials of the supporting structure, and thus affects the security of the wind turbine.
The study found that such adverse environmental factors might easily result in a whole or partial component damage of the foundation support structure, and eventually lead to the reduction of security and durability.
However, due to the complex environment at sea, the bracing structure of the offshore wind turbine set will be affected by various negative factors like seawater corrosion, marine growths, water scour, collision of sea ice and ship, etc., which causes damage to the supporting structure of the offshore wind turbine set and affects the security of the set.
The harm of marine environment to the supporting structure of the offshore wind turbine The supporting structure of the offshore wind turbine set not only bear the influence from wind, wave and current, but also bear the long-term influence of negative factors such as seawater corrosion, marine growths, water scour, collision of sea ice and ship, and so on.
The corrosion has serious influence on the mechanical property of the materials of the supporting structure, and thus affects the security of the wind turbine.
Online since: November 2012
Authors: W. Tian, L. Hua, C. Zeng
Laser cladding act as a remanufacturing technology used more and more but the study of the fatigue properties of such products falls relatively behind.
The test material is Q235A steel, according to the Chinese national standard GB/T 700-2006, its chemical composition is given in Table 1 and its mechanical property is given in Table 2 by static tension experiment.
C Si Mn S P Q235A £0.22 £0.35 £1.40 £0.050 £0.045 Table 2 Mechanical properties Steel no.
Moreover, the spontaneous signal was very weak and after amplification error cannot be avoid taking into account the environmental factors.
Further work will be focused on this problem correlating with the fatigue property by statistic analysis methodology.
The test material is Q235A steel, according to the Chinese national standard GB/T 700-2006, its chemical composition is given in Table 1 and its mechanical property is given in Table 2 by static tension experiment.
C Si Mn S P Q235A £0.22 £0.35 £1.40 £0.050 £0.045 Table 2 Mechanical properties Steel no.
Moreover, the spontaneous signal was very weak and after amplification error cannot be avoid taking into account the environmental factors.
Further work will be focused on this problem correlating with the fatigue property by statistic analysis methodology.
Online since: May 2007
Authors: Jun Wang, Rong Guo Hou, Yan Xia Feng, X.Y. Lu, Chuan Zhen Huang
The fillet diameter, the
inner cone angle, the length of mixing tube of the nozzle greatly affect the field of two-phase flow.
In addition, the volume concentration of each phase, the grain grit, the physical property (density, viscosity etc), and the relative velocity between two phases changed in a broad range.
The model is divided by the triangle cell, the previous experiments indicate the factors which affect the field of two phase flow are the cone angle, the fillet diameter and the length of mixing tube.
The simulation results also indicate that the cone angle in the nozzle affects the tension of the swirl, and the smaller of the cone angle the easer of the flowing.
The simulation results indicate that the fillet diameter, the inner cone angle, mixing tube of the nozzle greatly affect the field of two-phase flow.
In addition, the volume concentration of each phase, the grain grit, the physical property (density, viscosity etc), and the relative velocity between two phases changed in a broad range.
The model is divided by the triangle cell, the previous experiments indicate the factors which affect the field of two phase flow are the cone angle, the fillet diameter and the length of mixing tube.
The simulation results also indicate that the cone angle in the nozzle affects the tension of the swirl, and the smaller of the cone angle the easer of the flowing.
The simulation results indicate that the fillet diameter, the inner cone angle, mixing tube of the nozzle greatly affect the field of two-phase flow.