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Online since: May 2022
Authors: Hong Wei Liu, Zhi Hui Li, He Yin, Li Zhen Yan
Zn and Mg elements, as the main compositions, significantly affect the microstructure and properties of Al-Zn-Mg-Cu alloy [3, 4].
Therefore, the homogenization has played a key role in ameliorating mechanical properties.
The homogenization temperature is also a major factor affecting the dissolution of AlZnMgCu phase.
Cao, Investigation on microstructure and mechanical properties of Al-Zn-Mg-Cu alloys with various Zn/Mg ratios, J.
Li, Effect of homogenization treatment on microstructure and mechanical properties of DC cast 7X50 aluminum alloy, Nonferrous Met.
Therefore, the homogenization has played a key role in ameliorating mechanical properties.
The homogenization temperature is also a major factor affecting the dissolution of AlZnMgCu phase.
Cao, Investigation on microstructure and mechanical properties of Al-Zn-Mg-Cu alloys with various Zn/Mg ratios, J.
Li, Effect of homogenization treatment on microstructure and mechanical properties of DC cast 7X50 aluminum alloy, Nonferrous Met.
Online since: July 2015
Authors: Rudeerat Suntako
Therefore, it is interested to investigate the factors which affect to the nuclei formation and growth of nuclei under synthesis.
Shen et al. [9] study factors that affect the growth of particle under microwave irradiation using Zn(acac)2.H2O (acac = acetylacetonate) as precursor.
The additive is an important factor in the formation of ZnO with different morphology.
The PAA as polymeric additive is an important factor for controlling the morphology of ZnO nano rods.
Suntako, Cure characteristics and mechanical properties of ZnO nanoparticles as activator in unfilled natural rubber, Adv.
Shen et al. [9] study factors that affect the growth of particle under microwave irradiation using Zn(acac)2.H2O (acac = acetylacetonate) as precursor.
The additive is an important factor in the formation of ZnO with different morphology.
The PAA as polymeric additive is an important factor for controlling the morphology of ZnO nano rods.
Suntako, Cure characteristics and mechanical properties of ZnO nanoparticles as activator in unfilled natural rubber, Adv.
Online since: December 2006
Authors: Bok Choon Kang, Beong Bok Hwang, Jong Kwang Park, Yong Hwang Roh, Chathura Nalendra Herath
This paper is concerned the breaking elongation properties of Carbon/Aramid-,
Carbon/Glass- and Aramid/Glass- matrix hybridized commingling yarns.
Since breaking elongation is one of most important properties in textile fiber, it was examined closely with reference to the first breaking point of commingling-hybrid yarns.
GF/AF/matrix is shown very much better elongation properties.
This is closely related to the behavior of tensile properties such as elongation and yarns modulus.
To obtain a good elongation properties, PP matrix is most suitable among other selected matrix materials as given in Fig.2, because, PP and PES can bear more tensile forces than PEEK matrices filaments.
Since breaking elongation is one of most important properties in textile fiber, it was examined closely with reference to the first breaking point of commingling-hybrid yarns.
GF/AF/matrix is shown very much better elongation properties.
This is closely related to the behavior of tensile properties such as elongation and yarns modulus.
To obtain a good elongation properties, PP matrix is most suitable among other selected matrix materials as given in Fig.2, because, PP and PES can bear more tensile forces than PEEK matrices filaments.
Online since: October 2011
Authors: Yong Li Zhu, Zhuo Dong
Usually there are many gases parameters affecting transformer faults, but it is impossible for us to build an equation system including all relevant parameters in the fault diagnosis model, and the high correlation between the various gases parameters will have adverse effects on the accuracy and rate of fault diagnosis.
Establishment of training set and test set.Taking the transformer type, capacity, operating environment and other relevant factors into Consideration, we choose transformers with voltage level equal or below 220KV as research subjects.
Normalization can prevent excessive weight when properties with a larger initial value compared to properties with smaller initial value.
GEP can reflect the relationship between training samples and the relevant factors, and adaptively identify factors associated with the load changes, then generate fault diagnosis model automatically.
MECHANICAL ENGINEERING & AUTOMATION, vol. 3, pp. 122-123, 2010
Establishment of training set and test set.Taking the transformer type, capacity, operating environment and other relevant factors into Consideration, we choose transformers with voltage level equal or below 220KV as research subjects.
Normalization can prevent excessive weight when properties with a larger initial value compared to properties with smaller initial value.
GEP can reflect the relationship between training samples and the relevant factors, and adaptively identify factors associated with the load changes, then generate fault diagnosis model automatically.
MECHANICAL ENGINEERING & AUTOMATION, vol. 3, pp. 122-123, 2010
Online since: July 2015
Authors: Hamimah Abdul Rahman, Andanastuti Muchtar, Sufizar Ahmad, Linda Agun, Muhamad Subri Abu Bakar
Thermal expansion coefficient (TEC) is one of the most important factors that ensure reliability of a SOFC system [4].
Tietz [5] found that large differences in TEC may induce large internal stress during the actual application, thereby affecting the operational stability of SOFCs.
From Powder Properties to Fuel Cell Performance – A Holistic Approach for SOFC Cathode Development, Solid State Ionics. 179 (2008) 1509–1515
A., Muchtar, A., Muhamad, N., & Abdullah, HStructure and Thermal Properties of La0.6Sr0.4Co0.2Fe0.8O3−δ–SDC Carbonate Composite Cathodes for Intermediate-to Low-Temperature Solid Oxide Fuel Cells, Ceram.
Structure, Electrical Conducting and Thermal Expansion Properties of La0.6Sr0.4Co0.2Fe0.8O3−δ–Ce0.8Sm0.2O2−δ Composite Cathodes, J.
Tietz [5] found that large differences in TEC may induce large internal stress during the actual application, thereby affecting the operational stability of SOFCs.
From Powder Properties to Fuel Cell Performance – A Holistic Approach for SOFC Cathode Development, Solid State Ionics. 179 (2008) 1509–1515
A., Muchtar, A., Muhamad, N., & Abdullah, HStructure and Thermal Properties of La0.6Sr0.4Co0.2Fe0.8O3−δ–SDC Carbonate Composite Cathodes for Intermediate-to Low-Temperature Solid Oxide Fuel Cells, Ceram.
Structure, Electrical Conducting and Thermal Expansion Properties of La0.6Sr0.4Co0.2Fe0.8O3−δ–Ce0.8Sm0.2O2−δ Composite Cathodes, J.
Online since: March 2009
Authors: Murat Baydogan, Celaletdin Ergun, Abdurrahman Bahadir
For
this reason, HA has been extensively used as an implant material for a bone substitute
material because of its excellent osteoconductive properties.
The properties of HA can be modified by a substitution mechanism with different ions into HA structure.
Today, there are many researches on HA crystal morphology, density, porosity, pore sizes and distribution, chemical composition, and surface structure which are major factors affecting the performance of HA.
After revision surgery, biomaterial-centered infection is one of problem which affects the patient life.
As an antibacterial material silver and silver-based compounds found to be very effective on 16 kinds of bacteria, including Escherichia coli and Staphylococcus aureus with their antiseptic properties [9].
The properties of HA can be modified by a substitution mechanism with different ions into HA structure.
Today, there are many researches on HA crystal morphology, density, porosity, pore sizes and distribution, chemical composition, and surface structure which are major factors affecting the performance of HA.
After revision surgery, biomaterial-centered infection is one of problem which affects the patient life.
As an antibacterial material silver and silver-based compounds found to be very effective on 16 kinds of bacteria, including Escherichia coli and Staphylococcus aureus with their antiseptic properties [9].
Online since: October 2004
Authors: Yu Ming Ye, Qin Yong Niu, Yu Jie Liu, Li Xun Cai
During the last decades, the academe popularly considers
the key factors affecting on ratcheting behavior as follows: stress amplitude σa, mean stress σm,
stress rates dσ/dN, cyclic numbers N, temperature θ, stress history χ, temperature history ξ, etc.
The General mechanical properties of two materials are listed in Tab.1.
General mechanical properties of the materials material Yield Strength σ0.2[MPa] Tensile strength σb[MPa] Youngs Modulus E [GPa] Ratio of elongation δ5 [%] Percentage reduction of area Ψ [%] 304 230 660 195 52 62 1Cr18Ni9Ti 231 700 195 53 62 All uniaxial cyclic loadings on specimens were performed by two MTS machines: MTS810 (100KN) and MTS809 (25KN) with controlling by TestStar II controller and MTS Test-Ware/SX application.
The results show that the effect of mean stress on SR strain is small within area of mean stress:20~120MPa, hence the peak σp is unitary factor of stress to control the ratcheting deformation as σ Τ m is larger than about 20 MPa or σ T m and σ T p are dualistic factors to act on SR strain as σ Τ m is small.
From the experimental properties discussed above and without considering the influence of stress ratio, ratcheting strain evolution equation Eq.1 can be simplified as: ),,,( ξθσε Nf rr = .
The General mechanical properties of two materials are listed in Tab.1.
General mechanical properties of the materials material Yield Strength σ0.2[MPa] Tensile strength σb[MPa] Youngs Modulus E [GPa] Ratio of elongation δ5 [%] Percentage reduction of area Ψ [%] 304 230 660 195 52 62 1Cr18Ni9Ti 231 700 195 53 62 All uniaxial cyclic loadings on specimens were performed by two MTS machines: MTS810 (100KN) and MTS809 (25KN) with controlling by TestStar II controller and MTS Test-Ware/SX application.
The results show that the effect of mean stress on SR strain is small within area of mean stress:20~120MPa, hence the peak σp is unitary factor of stress to control the ratcheting deformation as σ Τ m is larger than about 20 MPa or σ T m and σ T p are dualistic factors to act on SR strain as σ Τ m is small.
From the experimental properties discussed above and without considering the influence of stress ratio, ratcheting strain evolution equation Eq.1 can be simplified as: ),,,( ξθσε Nf rr = .
Online since: July 2008
Authors: Jiu Hua Xu, Yu Can Fu, Wen Guo Huo
Unfortunately, the unique physical and chemical properties that make these alloys suitable for
many applications also contribute to the difficulty with which they are cut or ground.
Furthermore it will affect the dimensional accuracy and the form accuracy[5].
The conclusions can be obtained as following: 1) The numerical model of dry belt grinding titanium alloy has been developed depending on different factors which have been taken into account during the modeling process, including the three kinds of compounded boundary conditions.
Chinese Mechanical Engineering, Vo1.9 (4) (1998), p.2
The Finite Element Method, (Mechanical Industry Publications, China, 1992)
Furthermore it will affect the dimensional accuracy and the form accuracy[5].
The conclusions can be obtained as following: 1) The numerical model of dry belt grinding titanium alloy has been developed depending on different factors which have been taken into account during the modeling process, including the three kinds of compounded boundary conditions.
Chinese Mechanical Engineering, Vo1.9 (4) (1998), p.2
The Finite Element Method, (Mechanical Industry Publications, China, 1992)
Online since: September 2019
Authors: Mohammed Amine Belyamna, Racim Boutelidja, Abdelmoumene Guedri
The leak probability of both pipe sizes is not affected by the seismic curve.
Security factors with fixed values have been substituted for a conventional probability of failure value.
In the probabilistic structural integrity evaluation, the failure probability is calculated using mathematical models, which include dominant factors concerning with the failure behavior.
The material properties required for the crack growth of 304 steel are introduced into this code and preselected in this case.
The leak probability is not affected by the seismic curve.
Security factors with fixed values have been substituted for a conventional probability of failure value.
In the probabilistic structural integrity evaluation, the failure probability is calculated using mathematical models, which include dominant factors concerning with the failure behavior.
The material properties required for the crack growth of 304 steel are introduced into this code and preselected in this case.
The leak probability is not affected by the seismic curve.
Online since: July 2015
Authors: Xavier Sauvage, Yana Nasedkina
Combining strengthening by grain size reduction with precipitate hardening is an attractive approach for the improvement of the mechanical properties of UFG alloys.
Recently some strategies for structure and properties optimization have been proposed by Hirosawa and co-authors [38].
Schematic Time/Temperature/Transformation (TTT) diagrams showing a SPD induced phase separation in a quenched super-saturated solid solution induced by: a) - temperature increase during the SPD process; b) - significant change of the atomic mobility resulting from crystalline defects created during the SPD (leading to the modification of the transformation area delimited by the blue line) Grain boundary segregations induced by SPD GB segregation is an extremely sensitive phenomenon because it may affect such material properties like toughness, ductility, corrosion resistance or thermal stability [75-77].
The combination of UFG structures with precipitate hardening faces a real challenge to optimize the nanoscaled structure and thus the final properties.
Some unique features like segregations along the non-equilibrium GBs created by SPD could have a positive effect on properties (better thermal stability, for example), but also a detrimental effect (easy solute source for heterogeneous precipitation or solute starvation for intra-granular precipitation).
Recently some strategies for structure and properties optimization have been proposed by Hirosawa and co-authors [38].
Schematic Time/Temperature/Transformation (TTT) diagrams showing a SPD induced phase separation in a quenched super-saturated solid solution induced by: a) - temperature increase during the SPD process; b) - significant change of the atomic mobility resulting from crystalline defects created during the SPD (leading to the modification of the transformation area delimited by the blue line) Grain boundary segregations induced by SPD GB segregation is an extremely sensitive phenomenon because it may affect such material properties like toughness, ductility, corrosion resistance or thermal stability [75-77].
The combination of UFG structures with precipitate hardening faces a real challenge to optimize the nanoscaled structure and thus the final properties.
Some unique features like segregations along the non-equilibrium GBs created by SPD could have a positive effect on properties (better thermal stability, for example), but also a detrimental effect (easy solute source for heterogeneous precipitation or solute starvation for intra-granular precipitation).