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Online since: May 2012
Authors: Song Yan Wang, Cheng Cheng Du, Jie Zhu
The reinforcement of the steel columns becomes the focus of the project, what’s more, heavy workload is needed, which became the main factors affecting the duration and cost.
1.
This project strengens the columns with the method of increasing the component’s section, changing component’s section properties, increasing the bearing capacity and stiffness.The method adopted in this project refers to the method that the new steel columns composed of the original steel columns and added H-shaped steel columns, connected by the bolts, reach the design requirement according to the property of the component, meantime, taking the reduction factor into account [2].
These three points are the main factors which affect the reasonable force of the columns.
The element that affects the force of the bolts is the axial force of new steel columns and original steel columns and the moment of the columns.
The figure 6 and figure 7 show how to pick up external loads that affect the force of the bolts.
This project strengens the columns with the method of increasing the component’s section, changing component’s section properties, increasing the bearing capacity and stiffness.The method adopted in this project refers to the method that the new steel columns composed of the original steel columns and added H-shaped steel columns, connected by the bolts, reach the design requirement according to the property of the component, meantime, taking the reduction factor into account [2].
These three points are the main factors which affect the reasonable force of the columns.
The element that affects the force of the bolts is the axial force of new steel columns and original steel columns and the moment of the columns.
The figure 6 and figure 7 show how to pick up external loads that affect the force of the bolts.
Online since: February 2011
Authors: Yu Bai, Yun Hai Hou, Er Shuai Li, Shi Hua Sun
In ordinary fuzzy control, linear quantitative method is usually adopted by changing the quantitative factors to change the discussing domains.
Definition of quantification factors is: (1) As shown in fig.2 (a), once the quantitative factors have been selected, any value of language variables can be counted as a certain element on the domain.
Results and analysis of experiments Change the fusion width to obtaine the welding current and welding properties.
Journal of mechanical engineering, (2000.8) [2] ChenDan, zhang bees, HeGuiMing.
Fuzzy control principle and application of mechanical industry. (2005).1 press
Definition of quantification factors is: (1) As shown in fig.2 (a), once the quantitative factors have been selected, any value of language variables can be counted as a certain element on the domain.
Results and analysis of experiments Change the fusion width to obtaine the welding current and welding properties.
Journal of mechanical engineering, (2000.8) [2] ChenDan, zhang bees, HeGuiMing.
Fuzzy control principle and application of mechanical industry. (2005).1 press
Online since: February 2013
Authors: Ji Long Su, Yan Jiao Zhang, Xing Feng Lian
The domestic and foreign scholars have conducted a series of studies to the mechanical properties, Lu Jing et al[2] proposed a calculation of the incremental iterative algorithm to analyze the characteristics of micro-beams of the force, the method which has high accuracy and stability is one of the effective methods to analyze large micro-beam deflection.
Micro-mechanical devices from the mechanical structure can be mainly divided into cantilever and fixed beam structure[5].
Many foreign scholars established a variety of micro-mechanical beam model, using finite element method to research both the mechanical properties of beam and pull-in voltage and pull-in deflection[6].
The stress distribution is the main factor in affecting the fatigue damage of micro-devices.
The results show that the mechanical properties of the micro-beams possess significant scale effect.
Micro-mechanical devices from the mechanical structure can be mainly divided into cantilever and fixed beam structure[5].
Many foreign scholars established a variety of micro-mechanical beam model, using finite element method to research both the mechanical properties of beam and pull-in voltage and pull-in deflection[6].
The stress distribution is the main factor in affecting the fatigue damage of micro-devices.
The results show that the mechanical properties of the micro-beams possess significant scale effect.
Online since: December 2010
Authors: Fang Ran Zhao, Shu Fang Wang
UTW technique is concerned many factors influencing the bonding mechanism of the overlay-substrate interface.
Many factors can influence on the characteristic of transition layer in UTW.
Properties and structural characteristics of transition layer become determinate factors of bond strength joining ultra-thin overlay with old concrete.
The intensity of impact on the interface will be influenced with several factors, including the difference of physical and mechanical parameters of new and old concrete, difference of humidity or temperature under different environment.
Properties and structural characteristics of transition layer become determinate factors of bond strength linking overlay and old concrete.
Many factors can influence on the characteristic of transition layer in UTW.
Properties and structural characteristics of transition layer become determinate factors of bond strength joining ultra-thin overlay with old concrete.
The intensity of impact on the interface will be influenced with several factors, including the difference of physical and mechanical parameters of new and old concrete, difference of humidity or temperature under different environment.
Properties and structural characteristics of transition layer become determinate factors of bond strength linking overlay and old concrete.
Online since: July 2011
Authors: Xin Zheng Wu, Xiang Yun Deng, Ri Ke Chen, Hai Tao Zhang, Guo Qing Zhang, Di Chen
As is known to all, dielectric properties of BT electronic ceramic, like permittivity, capacity and impedance etc., are closely related to frequency.
Therefore, some investigations on the complex dielectric properties of BT in different frequency ranges are carried out [2-5].
Arlt [3] reckoned two mechanisms, one is the normal piezoelectric effect and the other is a domain wall effect, as influence factors on dielectric properties at strong ultrasonic microwave frequencies.
For modifying BT ferroelectric and dielectric properties, many elements were introduced to substitute barium and/or titanium ion.
For the former, diffused phase transition is critical to dielectric relaxation behavior in BT-based ferroelectric ceramics [6, 7]; whereas for the later, oxygen vacancies play an important role in affecting dielectric relaxation [8, 9].
Therefore, some investigations on the complex dielectric properties of BT in different frequency ranges are carried out [2-5].
Arlt [3] reckoned two mechanisms, one is the normal piezoelectric effect and the other is a domain wall effect, as influence factors on dielectric properties at strong ultrasonic microwave frequencies.
For modifying BT ferroelectric and dielectric properties, many elements were introduced to substitute barium and/or titanium ion.
For the former, diffused phase transition is critical to dielectric relaxation behavior in BT-based ferroelectric ceramics [6, 7]; whereas for the later, oxygen vacancies play an important role in affecting dielectric relaxation [8, 9].
Online since: October 2004
Authors: Gordon W. Lorimer, John F. Humphreys, L.W.F. Mackenzie, T. Wilks
In
WE43 the particle distribution affected the onset of dynamic recrystallization.
Introduction In the extruded condition alloys such as AZ31 and ZC71 have been reported to have anisotropic mechanical properties, whilst others such as WE43 and WE54 exhibit isotropic behaviour [1, 2].
These anisotropic mechanical properties in compression and tension appeared to be caused by texture which had evolved during thermomechanical processing [3].
Although deformation mechanisms are reported to affect texture development in magnesium [4], it has also been suggested that differences in texture in magnesium extrusions might be attributed to different recrystallization mechanisms [1].
It is important to develop an understanding of the factors affecting the recrystallization mechanisms in magnesium if the structure-property relationships are to be understood during thermomechanical processing.
Introduction In the extruded condition alloys such as AZ31 and ZC71 have been reported to have anisotropic mechanical properties, whilst others such as WE43 and WE54 exhibit isotropic behaviour [1, 2].
These anisotropic mechanical properties in compression and tension appeared to be caused by texture which had evolved during thermomechanical processing [3].
Although deformation mechanisms are reported to affect texture development in magnesium [4], it has also been suggested that differences in texture in magnesium extrusions might be attributed to different recrystallization mechanisms [1].
It is important to develop an understanding of the factors affecting the recrystallization mechanisms in magnesium if the structure-property relationships are to be understood during thermomechanical processing.
Online since: September 2013
Authors: Chanchana Thanachayanont, Chabaiporn Junin, Tossapol Tippo, Apinunt Thanachayanont, Seeroong Prichanont, Micheal Hietschold
Good dielectric properties were obtained on glass and PEN at film thicknesses of 95 nm.
Defects in the dielectric layer can influence its electrical properties.
Dissolving PMMA in dimethylformamide (DMF) solution has produced films with high-quality mechanical and physical properties [4].
Salerno, Solvent effects on the thermal and mechanical properties of poly(methyl methacrylate) casted from concentrated solutions, Adv.
Gorman, The influence of solvent quality on the mechanical properties of thin cast isotactic poly(methyl methacrylate) coatings, J.
Defects in the dielectric layer can influence its electrical properties.
Dissolving PMMA in dimethylformamide (DMF) solution has produced films with high-quality mechanical and physical properties [4].
Salerno, Solvent effects on the thermal and mechanical properties of poly(methyl methacrylate) casted from concentrated solutions, Adv.
Gorman, The influence of solvent quality on the mechanical properties of thin cast isotactic poly(methyl methacrylate) coatings, J.
Online since: February 2012
Authors: Li Xin Li
Properties of Ni-Cu bulk alloy prepared by spark plasma sintering technique
L.X.
Introduction Nanomaterials, especially bulk nanocrystals have drawn considerable scientific attention because of their attractive properties in mechanical, physical and chemical fields[1-3].
The technique of MA (mechanical alloying) [7] was widely adopted to obtain enough large nanocrystals, but the low-purity production undoubtedly affected the properties of the nanocrystals.
The microstructure and mechanical properties of the as-prepared bulk alloys were investigated, and the formation mechanism of the as-prepared bulk alloy was discussed.
The tensile strength of the specimens sintered at 600˚C are the highest among the sintered specimens, but their density is not like that, which indicates that the strength of the sintered specimens exists other influence factors besides density.
Introduction Nanomaterials, especially bulk nanocrystals have drawn considerable scientific attention because of their attractive properties in mechanical, physical and chemical fields[1-3].
The technique of MA (mechanical alloying) [7] was widely adopted to obtain enough large nanocrystals, but the low-purity production undoubtedly affected the properties of the nanocrystals.
The microstructure and mechanical properties of the as-prepared bulk alloys were investigated, and the formation mechanism of the as-prepared bulk alloy was discussed.
The tensile strength of the specimens sintered at 600˚C are the highest among the sintered specimens, but their density is not like that, which indicates that the strength of the sintered specimens exists other influence factors besides density.
Online since: September 2007
Authors: Xi De Li, Zhao Zhang, Wen Shen
Therefore, it is very necessary to investigate the material and mechanical properties of
thin films, such as the deformation and the failure mechanism, to offer the design and fabrication of
the micro devices sufficient information and data.
To compare with the experimental results and evaluate different factors influencing on microbridge deformation, we simulated this problem with AQABUS.
Thirdly, different factors are considered in the model to explain the difference.
Among these factors, boundary condition, boundary shape, nonuniform thickness and uniform residual stress have little effect on the microbridge deformation.
Furthermore, the results of experiments are compared with results of the finite element simulation and some possible factors might affect the deformations of the microbridges are also discussed.
To compare with the experimental results and evaluate different factors influencing on microbridge deformation, we simulated this problem with AQABUS.
Thirdly, different factors are considered in the model to explain the difference.
Among these factors, boundary condition, boundary shape, nonuniform thickness and uniform residual stress have little effect on the microbridge deformation.
Furthermore, the results of experiments are compared with results of the finite element simulation and some possible factors might affect the deformations of the microbridges are also discussed.
Online since: November 2022
Authors: Mariatti Jaafar@ Mustapha, Azlin Fazlina Osman, Nur Hidayah Ahmad Zaidi, Sinar Arzuria Adnan, Ismail Ibrahim, Di Sheng Lai, Midhat Nabil Ahmad Salimi
The packaging film based on TPS possesses low mechanical properties and high moisture sensitivity.
Retrogradation causes detrimental effect to the TPS films as it will alter the mechanical properties and affect the quality of the final product.
There are many factors that lead to the retrogradation in the TPS films such as humidity, storage time and glass-transition temperature, Tg [6].
Hybrid fillers were studied extensively for enhancing the mechanical properties of the TPS films.
The mechanical properties of TPSF and HTPSF aged for 15, 30, 45, 60, 90-days are shown in Table 1.
Retrogradation causes detrimental effect to the TPS films as it will alter the mechanical properties and affect the quality of the final product.
There are many factors that lead to the retrogradation in the TPS films such as humidity, storage time and glass-transition temperature, Tg [6].
Hybrid fillers were studied extensively for enhancing the mechanical properties of the TPS films.
The mechanical properties of TPSF and HTPSF aged for 15, 30, 45, 60, 90-days are shown in Table 1.