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Online since: July 2020
Authors: Norihan Yahya, Azman Kasim, Nurulhuda Mohammad Yusoff, Azhan Hashim, Nurul Huda Afrizal
The effect of Y2O3 on physical, mechanical and structural properties of glasses have been investigated using different characterization techniques.
According to [5], the hardness values obtained by micro-indentation rely mainly on the strength of the bond, atomic packing density and other factors.
BaO-Ga203-GeO2 glasses with enhanced properties.
Physical Properties of Lithium Containing Cadmium.
Structural properties of Zinc Lithium borate glass.
According to [5], the hardness values obtained by micro-indentation rely mainly on the strength of the bond, atomic packing density and other factors.
BaO-Ga203-GeO2 glasses with enhanced properties.
Physical Properties of Lithium Containing Cadmium.
Structural properties of Zinc Lithium borate glass.
Online since: November 2010
Authors: Xian Fa Li
The suitable process conditions of preparing the blend films with good water-resistance and mechanical properties were determined by single-factor experiments.
SEM, FT-IR, TGA and DSC analysis were performed to examine the contribution of LS and borax to the properties of the blend films.
Each value of mechanical properties reported was an average of three specimens.
Results and discussion Mechanical properties The effects of the LS content on the tensile strength (σb) and elongation at break (εb) for the blend films were shown in Fig.1.
Thermal properties Fig. 7.
SEM, FT-IR, TGA and DSC analysis were performed to examine the contribution of LS and borax to the properties of the blend films.
Each value of mechanical properties reported was an average of three specimens.
Results and discussion Mechanical properties The effects of the LS content on the tensile strength (σb) and elongation at break (εb) for the blend films were shown in Fig.1.
Thermal properties Fig. 7.
Online since: November 2011
Authors: Jing Liu, Ye Xian Ouyang
The magnetic properties including core loss and magnetic flux density are main factors determining the motor efficiency.
The silicon and aluminum are the key elements related to the magnetic properties.
Since phosphorus can remarkably reduce core loss of electrical steels, and has a little effect on its magnetic flux density[2-5], it is a good substitute of silicon and aluminum to improve magnetic properties.
The high temperature annealing brittleness was investigated via mechanical tester, SEM and AES.
It is found that the cooling manners do not affect the time of emerging brittleness.
The silicon and aluminum are the key elements related to the magnetic properties.
Since phosphorus can remarkably reduce core loss of electrical steels, and has a little effect on its magnetic flux density[2-5], it is a good substitute of silicon and aluminum to improve magnetic properties.
The high temperature annealing brittleness was investigated via mechanical tester, SEM and AES.
It is found that the cooling manners do not affect the time of emerging brittleness.
Online since: June 2012
Authors: Mao Lin Tang, Rui Li Shen, Kun Yan, Ya Guang Du
Study of the Bending Stiffness and Cable Characteristics of Tension Components
TANG Maolin1,a, DU Yaguang2,b, SHEN Ruili3,c,YAN Kun4,d
1Bridge Engineering Department, Southwest Jiaotong University, Chengdu Sichuan 610031, China
2Bridge Engineering Department, Southwest Jiaotong University, Chengdu Sichuan 610031, China
3Bridge Engineering Department, Southwest Jiaotong University, Chengdu Sichuan 610031, China
4Bridge Engineering Department, Southwest Jiaotong University, Chengdu Sichuan 610031, China
atmllpl@126.com, bdyguang321@yahoo.cn, crlshen@163.com, dstefyk@163.com
Keywords: Tension components; suspension cable; geometric shape; cable property; bending stiffness; tension stiffness; cable element; beam element.
Calculation results on a hollow beam verify that when tension increases, components’ mechanical properties gradually change from beam characteristics to cable characteristics and eventually they tend to be identical with the theoretical calculation of cable structure. 1 Introduction Bending stiffness has certern effects on force and deformation of tension bars, which is currently a research focus in structural Engineering[1,2].
Furthermore, analysis will be done to research factors affecting the cable-beam characteristic of tension bars. 2 Geometric shape equation solutions of tension components Including the impact of bending stiffness on tension members (Fig. 1), the equilibrium conditions of the micro-segmentation is ∑Y=0 dV- qdx=0, ∑M=0 M+dM-M+Hdy-(V+dV)dx+qdxdx/2=0, (2) Where we eliminate V and omitte higher order terms to get
(23) Mid-span deflection affected by rigid conditions is: ,
Calculation results on a hollow beam verify that when tension increases, components’ mechanical properties gradually change from beam characteristics to cable characteristics and eventually they tend to be identical with the theoretical calculation of cable structure. 1 Introduction Bending stiffness has certern effects on force and deformation of tension bars, which is currently a research focus in structural Engineering[1,2].
Furthermore, analysis will be done to research factors affecting the cable-beam characteristic of tension bars. 2 Geometric shape equation solutions of tension components Including the impact of bending stiffness on tension members (Fig. 1), the equilibrium conditions of the micro-segmentation is ∑Y=0 dV- qdx=0, ∑M=0 M+dM-M+Hdy-(V+dV)dx+qdxdx/2=0, (2) Where we eliminate V and omitte higher order terms to get
(23) Mid-span deflection affected by rigid conditions is: ,
Online since: September 2013
Authors: Qi Wang, Peng Song, Zhong Xi Yang, Lei Tian, Fu Lan Wang
Lots of researches show that, the addition of organic matter can affect the microstructure of cement stone, and improve the physical and mechanical properties of the cement mortar and cement concrete [2-5].
Materials and methods in mechanical approach Materials and mixtures Cement The ordinary Portland cement was employed in the experiment.
Preparation of CA solution CA solution was obtained via the following equation (calcium carbonate was excessive to ensure acrylic acid react completely): 2CH2CHOOH+CaCO3→(CH2CHO2)2Ca+ H2O (1) Preparation of test specimen Table 2 shows the three factors and three levels of orthogonal test.
Table 2 Three factors and three levels of orthogonal test Levels Factors A(initiator/%) B(cross-linking agent/%) C(accelerator/%) 1 1 8 3 2 2 10 5 3 3 12 7 Results and discussions Compressive strength in different ages The early strength of CA modified cement is lower than blank sample.
(3) Through DTA-TG and XRD analysis, CA can inhibit the transformation of AFm from AFt, and affect the nucleation and precipitation of Ca(OH)2.
Materials and methods in mechanical approach Materials and mixtures Cement The ordinary Portland cement was employed in the experiment.
Preparation of CA solution CA solution was obtained via the following equation (calcium carbonate was excessive to ensure acrylic acid react completely): 2CH2CHOOH+CaCO3→(CH2CHO2)2Ca+ H2O (1) Preparation of test specimen Table 2 shows the three factors and three levels of orthogonal test.
Table 2 Three factors and three levels of orthogonal test Levels Factors A(initiator/%) B(cross-linking agent/%) C(accelerator/%) 1 1 8 3 2 2 10 5 3 3 12 7 Results and discussions Compressive strength in different ages The early strength of CA modified cement is lower than blank sample.
(3) Through DTA-TG and XRD analysis, CA can inhibit the transformation of AFm from AFt, and affect the nucleation and precipitation of Ca(OH)2.
Online since: August 2014
Authors: Yin Feng Liu, Da Zhao Song, Yu Yao, Bi Yun Fu
Therefore, factors affecting the effect of viscosity of polymer include solid content, molecular weight and degree of hydrolysis and insolubles content, coefficient of screen mesh, filter factor, and other important parameters, combined with the experience conclusion[4] :reservoir pore radius median 5 times greater than the radius of polymer molecule cyclotron, blocking phenomenon will not occur.
Table 1 Polymer physics and chemistry performance test results The name of the polymer APP5 KYPAM HDSJ Solid content(%) 90.1 89.56 91.3 The molecular weight(104) 1200 3000 2500 Degree of hydrolysis(%) 18.2 23.2 25.1 Insolubles content(%) 0.15 0.0992 0.01 Screen mesh coefficient 18.37 53.2 25.6 The filter factor >1.5 >1.5 >1.5 Polymer solution viscosity adaptability In conveying manifold, well spacing, perforation and other mechanical shear and formation of minerals, biochemistry, oxygen degradation under the influence of factors such as[5], the viscosity of experience formula is: (1) In the type: :The ground polymer solution viscosity, mPas; :Underground oil viscosity, mPas; :Conveying manifold, well spacing, perforation caused by mechanical shear viscosity of polymer solution loss percentage
The salt resistance of the polymer solution Polymer solution after being injected reservoir, not only affected by the reservoir temperature, but also by the degradation of calcium and magnesium ions, bacteria, and oxygen.
Conclusions (1) Due to the specific conditions of low temperature and high salinity in the volga-ural basin reservoir, the single polymer were affected by the formation of minerals and biodegradable, causing serious loss of polymer solution viscosity and it can not meet the requirement of the theory
Compatibility of polymer molecular weight and core permeability properties, pore throat radius and polymer molecular thread whirling radius ratio [J].
Table 1 Polymer physics and chemistry performance test results The name of the polymer APP5 KYPAM HDSJ Solid content(%) 90.1 89.56 91.3 The molecular weight(104) 1200 3000 2500 Degree of hydrolysis(%) 18.2 23.2 25.1 Insolubles content(%) 0.15 0.0992 0.01 Screen mesh coefficient 18.37 53.2 25.6 The filter factor >1.5 >1.5 >1.5 Polymer solution viscosity adaptability In conveying manifold, well spacing, perforation and other mechanical shear and formation of minerals, biochemistry, oxygen degradation under the influence of factors such as[5], the viscosity of experience formula is: (1) In the type: :The ground polymer solution viscosity, mPas; :Underground oil viscosity, mPas; :Conveying manifold, well spacing, perforation caused by mechanical shear viscosity of polymer solution loss percentage
The salt resistance of the polymer solution Polymer solution after being injected reservoir, not only affected by the reservoir temperature, but also by the degradation of calcium and magnesium ions, bacteria, and oxygen.
Conclusions (1) Due to the specific conditions of low temperature and high salinity in the volga-ural basin reservoir, the single polymer were affected by the formation of minerals and biodegradable, causing serious loss of polymer solution viscosity and it can not meet the requirement of the theory
Compatibility of polymer molecular weight and core permeability properties, pore throat radius and polymer molecular thread whirling radius ratio [J].
Online since: August 2014
Authors: Keiji Ogawa, Toshiki Hirogaki, Shinya Imura, Eiichhi Aoyama
The tensile strength and Young's modulus were measured as a static mechanical property.
Other factors (ex. the fiber gets twisted) will be evauated as future works.
Ono, Frequency responses of wood for musical instruments in relation to the vibrational properties, J.
Takura, The manufacture and Mechanical Properties of Composite Board Made from Starch-Based Biodegradable Plastic and Bamboo Powder, The Society of Materials Science Vol. 52, No. 4 (2003) 357-361 [5] P.
Aoyama and Y.Takagi, Binder-free Green Composite using Bamboo Fibres Extracted with a Machining Centre: Influence of Moisture Absorption on Mechanical Properties, Key Engineering Materials Vol. 516 (2012) 215-221 [9] K.
Other factors (ex. the fiber gets twisted) will be evauated as future works.
Ono, Frequency responses of wood for musical instruments in relation to the vibrational properties, J.
Takura, The manufacture and Mechanical Properties of Composite Board Made from Starch-Based Biodegradable Plastic and Bamboo Powder, The Society of Materials Science Vol. 52, No. 4 (2003) 357-361 [5] P.
Aoyama and Y.Takagi, Binder-free Green Composite using Bamboo Fibres Extracted with a Machining Centre: Influence of Moisture Absorption on Mechanical Properties, Key Engineering Materials Vol. 516 (2012) 215-221 [9] K.
Online since: September 2013
Authors: Yong Hua Wu
The high strength steel is widely used in industry, and reinforcement study of high strength steel with LSP is of great significance to improve the fatigue life of mechanical properties.
Laser-generated shock waves in a confining medium have been used to improve the mechanical properties in the surface region of various metals such as aluminum, steel and copper.
This shock wave is purely mechanical in nature and results in significant changes in the microstructure and properties[8][9].
The main factors influencing effect of laser shock processing are wavelength, output energy, light spatial and temporal distribution characteristics, the pulse width.
The main factors that influence the effect of laser shock processing are pulse energy (E), pulse width(τ), spot diameter(D), the material and thickness of transparent overlay namely constrained layer(CL) and absorption layer(AL), size and shape of specimen material, mechanical properties of material, and laser shock overlapping rate[1][4].
Laser-generated shock waves in a confining medium have been used to improve the mechanical properties in the surface region of various metals such as aluminum, steel and copper.
This shock wave is purely mechanical in nature and results in significant changes in the microstructure and properties[8][9].
The main factors influencing effect of laser shock processing are wavelength, output energy, light spatial and temporal distribution characteristics, the pulse width.
The main factors that influence the effect of laser shock processing are pulse energy (E), pulse width(τ), spot diameter(D), the material and thickness of transparent overlay namely constrained layer(CL) and absorption layer(AL), size and shape of specimen material, mechanical properties of material, and laser shock overlapping rate[1][4].
Online since: June 2015
Authors: Zenon Ignaszak, Jakub Hajkowski
Of course, the presence of voids in matrix structure affects on the local deterioration of mechanical properties of casting.
The main role of casting design virtualization in this approach to predict the structure continuity & phases and also the local mechanical properties is irreplaceable.
The presence of discontinuities in the material structure may have different effect on the deterioration of mechanical properties.
Validated by experimental validation maps of these local properties of castings can be used to construction optimization during design of cast products, taking into account the mechanical properties gradient [9].
The identification of variation of mechanical properties should be done with high circumspection being result of researcher experience or/and future validation works
The main role of casting design virtualization in this approach to predict the structure continuity & phases and also the local mechanical properties is irreplaceable.
The presence of discontinuities in the material structure may have different effect on the deterioration of mechanical properties.
Validated by experimental validation maps of these local properties of castings can be used to construction optimization during design of cast products, taking into account the mechanical properties gradient [9].
The identification of variation of mechanical properties should be done with high circumspection being result of researcher experience or/and future validation works
Online since: April 2022
Authors: Funmilayo Deborah Adewumi, George Orgwara, Monisola Adewale, Adefemi Omowole Adeodu, Ilesanmi Afolabi Daniyan
However, due to its high hydroxyl content of cellulose, natural fibre is susceptible to water absorption which invariably adversely affects properties of the composite.
The hydrophilic property of the natural fibres affect negatively the mechanical and microstructural properties of the NFPCs [10; 16].
According to Reddy and Yang [29], tensile strength and elongation of natural fibres are functions of factors such as cellulose content, ratio of length to diameter of the fibre and microfibrillar angle.
Rafiq, Mechanical Properties of Carrot Fibre-Epoxy Composite, Baghdad Science Journal. 9, 2 (2011) 335-340 [13] H.N.
Jonoobi, Mechanical Properties of Hybrid Kenaf/Glass Reinforced Epoxy Composite for Passenger Car Bumper Beam, Materials & Design. 31, 10 (2010) 4927–4932.
The hydrophilic property of the natural fibres affect negatively the mechanical and microstructural properties of the NFPCs [10; 16].
According to Reddy and Yang [29], tensile strength and elongation of natural fibres are functions of factors such as cellulose content, ratio of length to diameter of the fibre and microfibrillar angle.
Rafiq, Mechanical Properties of Carrot Fibre-Epoxy Composite, Baghdad Science Journal. 9, 2 (2011) 335-340 [13] H.N.
Jonoobi, Mechanical Properties of Hybrid Kenaf/Glass Reinforced Epoxy Composite for Passenger Car Bumper Beam, Materials & Design. 31, 10 (2010) 4927–4932.