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Online since: September 2012
Authors: Yun Huang, Hua Chai, Yun Zhao, Xin Dong Zhang
In abrasive belt grinding Titanium alloy blade of aviation engine experiment, through the single factor experiment method, the influence of abrasive belt linear speed and work-piece feeding speed on the grinding quantity is discussed.
Blade material requires sufficient mechanical properties, high chemical stability, high resistance to mechanical abrasion performance, good manufacturability, low coefficient of thermal expansion and good damping characteristics [1].
By the method of single factor experiments, paper studies that the influence of abrasive belt linear speed and work-piece feeding speed on the grinding quantity and clogging degree of belt are also analyzed.
If v too high, it will lead to grain enough to cut the surface of work-piece, producing only sliding and plow, material grinding quantity decreased, affecting the material removal rate continues to rise.
When grinding time is 3 ~ 30 min or so, the clogging degree of belt does not change significantly, so the grinding process is relatively stable. 3) In the influence clogging degree of abrasive belt factors, the work-piece feeding speed exceed abrasive belt linear speed.
Blade material requires sufficient mechanical properties, high chemical stability, high resistance to mechanical abrasion performance, good manufacturability, low coefficient of thermal expansion and good damping characteristics [1].
By the method of single factor experiments, paper studies that the influence of abrasive belt linear speed and work-piece feeding speed on the grinding quantity and clogging degree of belt are also analyzed.
If v too high, it will lead to grain enough to cut the surface of work-piece, producing only sliding and plow, material grinding quantity decreased, affecting the material removal rate continues to rise.
When grinding time is 3 ~ 30 min or so, the clogging degree of belt does not change significantly, so the grinding process is relatively stable. 3) In the influence clogging degree of abrasive belt factors, the work-piece feeding speed exceed abrasive belt linear speed.
Online since: April 2012
Authors: Mei Hong Liao
It will not only affect the subsequent production of company’s related products but also does harm to the enterprise image and brings much trouble for the enterprise.
Basic Implications of Virtual Mechanical Manufacturing Technology Confined by a variety of factors, traditional mechanical design technology usually relies on personal experience or habits to conduct mechanical engineering designs on the basis of a series of static hypotheses.
Process model can combine process parameters with design properties of products which can influence the manufacturing functions.
Dynamic Simulation Technology of Mechanical System VPT Dynamic simulation technology of mechanical system, namely the virtual prototyping technology (VPT) in the mechanical engineering design is a digital mechanical design method based on computer simulation model of the product.
On the Application of Virtual Technology in Mechanical Engineering [J].
Basic Implications of Virtual Mechanical Manufacturing Technology Confined by a variety of factors, traditional mechanical design technology usually relies on personal experience or habits to conduct mechanical engineering designs on the basis of a series of static hypotheses.
Process model can combine process parameters with design properties of products which can influence the manufacturing functions.
Dynamic Simulation Technology of Mechanical System VPT Dynamic simulation technology of mechanical system, namely the virtual prototyping technology (VPT) in the mechanical engineering design is a digital mechanical design method based on computer simulation model of the product.
On the Application of Virtual Technology in Mechanical Engineering [J].
Online since: June 2022
Authors: Ki Woo Nam, Kyoung Hee Gu, Gum Hwa Lee, Ki Sik Lee
When these structures are exposed to a hydrogen atmosphere and applied with acidic substances and stress, hydrogen embrittlement occurs, in which the mechanical properties are degraded due to the hydrogen attack on the microstructures.
The results of this study show that the fatigue limit was small by HAC affect in a corrosive environment of strong acid.
The fatigue limit of the crack specimen is highly dependent on the material properties, the threshold stress intensity factor of the long crack and the fatigue limit of the smooth specimen.
Nam, “Threshold stress intensity factor of ultra-high strength steel (HV670) containing surface crack by hydrogen assisted cracking and cumulative elastic wave“, Journal of Mechanical Science and Technology 35 (2021) 2441-2447
Nam, “Evaluation of fatigue limit and harmless crack size of needle peened offshore structure steel F690“, Journal of Mechanical Science and Technology 35(9) (2021) 3855-3862.
The results of this study show that the fatigue limit was small by HAC affect in a corrosive environment of strong acid.
The fatigue limit of the crack specimen is highly dependent on the material properties, the threshold stress intensity factor of the long crack and the fatigue limit of the smooth specimen.
Nam, “Threshold stress intensity factor of ultra-high strength steel (HV670) containing surface crack by hydrogen assisted cracking and cumulative elastic wave“, Journal of Mechanical Science and Technology 35 (2021) 2441-2447
Nam, “Evaluation of fatigue limit and harmless crack size of needle peened offshore structure steel F690“, Journal of Mechanical Science and Technology 35(9) (2021) 3855-3862.
Online since: April 2007
Authors: Kang Ming Huang, Zhi Peng Xie, Zhong Zhou Yi, Yong Huang, Xiao Jun Liu
Solid loading is the key factor for the injection molding process and the properties of
green body and sintered compacts.
Table 1 shows the properties of the two powders.
In CIM, solid loading is a key feature which affects the rheological behaviors of feedstock and the mechanical properties of final ceramics.
Table 4 shows the different mechanical properties of both powders, which includes green density, sintering density, shrinkage rate and fracture strength.
It is found that high solid loading is helpful to attain better mechanical properties.
Table 1 shows the properties of the two powders.
In CIM, solid loading is a key feature which affects the rheological behaviors of feedstock and the mechanical properties of final ceramics.
Table 4 shows the different mechanical properties of both powders, which includes green density, sintering density, shrinkage rate and fracture strength.
It is found that high solid loading is helpful to attain better mechanical properties.
Online since: July 2011
Authors: Zhan Tang Miao, Jing Li, Jia Liang Wang
Actually, building envelopes’ properties including lighting and thermal conditions are very important design elements affecting final building energy performance [2].
Kinetic envelopes design projects This section provides a summary of two of the final design projects submitted by the design teams that highlight responsible behaviors to climatic factors.
Elastic materials including inflated or water-filled material can change shapes and properties following external forces from human, rain, wind or others.
The embedded kinetic units can most impact on the building users and their comfort by controlling such factors as light, thermal comfort, and ventilation.
These methods of movement refer to the various mechanical motions needed to make a component actually move, as the next section elaborated.
Kinetic envelopes design projects This section provides a summary of two of the final design projects submitted by the design teams that highlight responsible behaviors to climatic factors.
Elastic materials including inflated or water-filled material can change shapes and properties following external forces from human, rain, wind or others.
The embedded kinetic units can most impact on the building users and their comfort by controlling such factors as light, thermal comfort, and ventilation.
These methods of movement refer to the various mechanical motions needed to make a component actually move, as the next section elaborated.
Online since: August 2007
Authors: Ouk Sub Lee, Dong Hyeok Kim, Man Jae Hur, Yeon Chang Park
Vibration fatigue reliability of Lead and Lead-Free Solder Joint
by FORM/SORM
Ouk Sub Lee
1, a, Man Jae Hur
2,b
, Yeon Chang Park
2,c
and Dong Hyeok Kim
2,d
1
School of Mechanical Engineering, InHa University, Incheon, Korea, 402-751
2
Department of Mechanical Engineering, InHa University, Incheon, Korea, 402-751
a
leeos@inha.ac.kr, bmrgio@korea.com, c
epalthek@daum.net, dkdonghyeok77@yahoo.co.kr
Keywords: Solder Joint, Reliability, Failure Probability, Vibration, FORM, SORM, MCS
Abstract.
It is well-known that the vibration significantly affect the life of solder joint.
The main factors were the number of vibration and temperature to influence the vibration fatigue of solder in the package.
It was pointed out that the number of vibration may affect the life of solder joint [1].
Using a common torsion fatigue machine that has been employed to estimate the shear fatigue properties of a material, vibration is induced to a package.
It is well-known that the vibration significantly affect the life of solder joint.
The main factors were the number of vibration and temperature to influence the vibration fatigue of solder in the package.
It was pointed out that the number of vibration may affect the life of solder joint [1].
Using a common torsion fatigue machine that has been employed to estimate the shear fatigue properties of a material, vibration is induced to a package.
Online since: August 2011
Authors: Rui Ma, Chun Jian Su, Shuang Shuang Miao, Su Min Guo, Zhen Yun Chu
There are many factors that affecting the bending springback.
Scheme of Bending Intelligent Control for Quadrangle Plate There are many factors that affecting the quadrangle plate bending springback based on the research of theory, numerical simulation and experimental research.
Material properties and working parameters, which include hardening exponent , strength coefficient , normal anisotropy , elasticity modulus , Poisson’s Ratio and friction coefficient , are identified by neural network in the early stages of bending.
According to the material properties and friction coefficient identified at the beginning of 10mm, the optimal blank holder is predicted by neural network, and then control the blank holder force by the hardware and electrical signal.
Journal of Mechanical Engineering Vol 42 (1), (2002), p.234
Scheme of Bending Intelligent Control for Quadrangle Plate There are many factors that affecting the quadrangle plate bending springback based on the research of theory, numerical simulation and experimental research.
Material properties and working parameters, which include hardening exponent , strength coefficient , normal anisotropy , elasticity modulus , Poisson’s Ratio and friction coefficient , are identified by neural network in the early stages of bending.
According to the material properties and friction coefficient identified at the beginning of 10mm, the optimal blank holder is predicted by neural network, and then control the blank holder force by the hardware and electrical signal.
Journal of Mechanical Engineering Vol 42 (1), (2002), p.234
Online since: July 2019
Authors: Giacomo Maculotti, Gianfranco Genta, Maurizio Galetto, Massimo Lorusso
SLM is capable of coupling freeform design and environmental and economical sustainability to high mechanical properties.
However, the aging treatment allows a partial recovery of these tensile properties [4].
This treatment significantly modifies the microstructure and thus the mechanical properties of components.
Tests were carried out under the hypothesis that mechanical properties of manufactured cubes are uniform, at least at macroscopic level, according to the known process repeatability [3,4].
Manfredi, On the selective laser melting (SLM) of the AlSi10Mg alloy: Process, microstructure, and mechanical properties, Mat. 10 (2017) 76-95
However, the aging treatment allows a partial recovery of these tensile properties [4].
This treatment significantly modifies the microstructure and thus the mechanical properties of components.
Tests were carried out under the hypothesis that mechanical properties of manufactured cubes are uniform, at least at macroscopic level, according to the known process repeatability [3,4].
Manfredi, On the selective laser melting (SLM) of the AlSi10Mg alloy: Process, microstructure, and mechanical properties, Mat. 10 (2017) 76-95
Online since: February 2012
Authors: Aitzol Lamikiz, Eneko Ukar, S. Martínez, I. Tabernero
Lamikiz1,d
1Department of Mechanical Engineering – University of the Basque Country UPV/EHU.
The conventional thermal models are focused on solving the differential equation of temperature field, considering the laser as heat source and thermal properties of each material.
In this case data will be taken out about unknown material properties to characterized total power losses in the process.
On the other hand the heat exchange by radiation is considered as component of the losses factor inside the nodes of the part radiated by the laser.
It is considered a nonlinear model with temperature dependant material properties, such as conductivity.
The conventional thermal models are focused on solving the differential equation of temperature field, considering the laser as heat source and thermal properties of each material.
In this case data will be taken out about unknown material properties to characterized total power losses in the process.
On the other hand the heat exchange by radiation is considered as component of the losses factor inside the nodes of the part radiated by the laser.
It is considered a nonlinear model with temperature dependant material properties, such as conductivity.
Online since: June 2013
Authors: Ying Ge Xu, Ze Wei Wu, Liang Liang Wang
It is widely used in military science field, and it is manufactured the penetrators as the main materials at home and abroad because of a series of excellent mechanical properties, corrosion resistance and absorption ability of radioactivity substance. the research of temperature effects on the mechanical properties of tungsten alloy were less reported.
The experiment researched the dynamic tensile property in the furnace by the high temperature heat furnace of Instron-3112(10℃/min).
(a) 10 ℃ (b) 700 ℃ Fig.3 Fracture surface of 93WNiFe alloy at different temperature The ultimate strength δb of tungsten alloy is influenced by the following factors in relative microcosmic: bonding phase strength δM, tungsten particles cleavage strength δW, tungsten particles and bonding phase release strength δW-M, tungsten-tungsten particle separation strength δW-W.
It illustrates that ultimate strength of tungsten alloy is closely related to the fracture morphology, meanwhile the fracture mode is affected by temperature. 3.3 Substance Analysis In the fracture observation, it also found that there was bright white materials on the surface of tungsten particles and tungsten particles with the bonding phase interface of fracture of tungsten alloy at the temperature 500-700℃ in Fig.4.
(2) The ultimate strength of tungsten alloy is related to fracture morphology closely, meanwhile the fracture mode is affected by temperature
The experiment researched the dynamic tensile property in the furnace by the high temperature heat furnace of Instron-3112(10℃/min).
(a) 10 ℃ (b) 700 ℃ Fig.3 Fracture surface of 93WNiFe alloy at different temperature The ultimate strength δb of tungsten alloy is influenced by the following factors in relative microcosmic: bonding phase strength δM, tungsten particles cleavage strength δW, tungsten particles and bonding phase release strength δW-M, tungsten-tungsten particle separation strength δW-W.
It illustrates that ultimate strength of tungsten alloy is closely related to the fracture morphology, meanwhile the fracture mode is affected by temperature. 3.3 Substance Analysis In the fracture observation, it also found that there was bright white materials on the surface of tungsten particles and tungsten particles with the bonding phase interface of fracture of tungsten alloy at the temperature 500-700℃ in Fig.4.
(2) The ultimate strength of tungsten alloy is related to fracture morphology closely, meanwhile the fracture mode is affected by temperature