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Online since: May 2018
Authors: Xiang Qian Yin, Xue Feng, Xu Jun Mi, Hao Feng Xie, Zhen Yang, Zong Wu Li, Guo Jie Huang, Lijun Peng
With different applied stress at 673K, 773K, 873K for 50h, creep data were attained by creep machine.
Table 1 lists the reduction of area of tensile samples at different temperature.
Table 1 Reduction of area of samples tested at different temperature.
Table 2 lists all steady-stage creep rate data with applied stress 40-70MPa at temperatures of 673-873K.
Creep rate 673K 773K 873K 40MPa 4.76×10-5 4.20×10-3 8.69×10-3 60MPa 2.77×10-3 5.67×10-3 1.27×10-2 70MPa 5.12×10-3 5.85×10-2 2.96×10-2 3.2.2 Creep mechanism analysis Apparent stress exponent n is a valuable parameter for analyzing the creep mechanism, those values can be calculated from the slopes of straight lines fitted with lnε and lnσ data.
Table 1 lists the reduction of area of tensile samples at different temperature.
Table 1 Reduction of area of samples tested at different temperature.
Table 2 lists all steady-stage creep rate data with applied stress 40-70MPa at temperatures of 673-873K.
Creep rate 673K 773K 873K 40MPa 4.76×10-5 4.20×10-3 8.69×10-3 60MPa 2.77×10-3 5.67×10-3 1.27×10-2 70MPa 5.12×10-3 5.85×10-2 2.96×10-2 3.2.2 Creep mechanism analysis Apparent stress exponent n is a valuable parameter for analyzing the creep mechanism, those values can be calculated from the slopes of straight lines fitted with lnε and lnσ data.
Online since: September 2011
Authors: Jian Hua Zhao, Ling Zhang
Wang et al. [2] presented a structural damage identification algorithm by using static test data and changes in natural frequencies.
It is worthy to note that the proposed approach can be directly applied in the cases of incomplete measured data without considering the static condensation.
Assuming the finite element model can accurately simulate the actual dynamic characteristics of the beam, and the observation data are obtained from the finite element model.
Two damage cases are considered in this study, i.e., 1) a single damage case that element 5 is damaged with a stiffness reduction of 30%; 2) a double damage case that element 9 and 16 have 30% and 20% reduction in stiffness, respectively.
Damages are simulated by a reduction in the stiffness of assumed elements.
It is worthy to note that the proposed approach can be directly applied in the cases of incomplete measured data without considering the static condensation.
Assuming the finite element model can accurately simulate the actual dynamic characteristics of the beam, and the observation data are obtained from the finite element model.
Two damage cases are considered in this study, i.e., 1) a single damage case that element 5 is damaged with a stiffness reduction of 30%; 2) a double damage case that element 9 and 16 have 30% and 20% reduction in stiffness, respectively.
Damages are simulated by a reduction in the stiffness of assumed elements.
Online since: June 2008
Authors: Y. Gao, K. Xiao, Y. Zhang, Y.S. Chan
This will be beneficial for the establishment of the transparent window and for the minimum
use of air for air speed reduction.
Fig. 2 Experimental setup Fig. 3 Setup for the laser sensor and the air piece The optical measurement system is connected to a computer which is used for data processing.
This is because more coolant is brought into the region causing a reduction in At.
For the other two cases, the reduction in At is not so clear (Fig. 7).
An increase in the table velocity causes a reduction in the transparent region area.
Fig. 2 Experimental setup Fig. 3 Setup for the laser sensor and the air piece The optical measurement system is connected to a computer which is used for data processing.
This is because more coolant is brought into the region causing a reduction in At.
For the other two cases, the reduction in At is not so clear (Fig. 7).
An increase in the table velocity causes a reduction in the transparent region area.
Online since: June 2010
Authors: Hajime Kato, Yoshimasa Takayama, Genjiro Hagino, Hayao Eguchi
At this time, the drawing reduction
in area were 8%, 22% and 35%, respectively.
These data were estimated by using the linear analysis.
The specimens were cold drawn with reductions of 8%, 22% and 35% after solution treatment at 1213K.
The high and cold reduction before aging shortened the time to reach peak hardness in aging at 713K.
The highest hardness and tensile strength were 306HV and 968MPa, respectively in the specimen with the reduction of 22% before aging at 693K.
These data were estimated by using the linear analysis.
The specimens were cold drawn with reductions of 8%, 22% and 35% after solution treatment at 1213K.
The high and cold reduction before aging shortened the time to reach peak hardness in aging at 713K.
The highest hardness and tensile strength were 306HV and 968MPa, respectively in the specimen with the reduction of 22% before aging at 693K.
Online since: June 2011
Authors: Yong Xiang Zhao, Guo Xiang Song, J.Y. Liu
Test details and primary test data are given in Table 1.
Therefore, scattered data are obtained in Table 1.
Real distributed shape of a set of data can be judged using a so-called statistical parameter, coefficient of skewness, g, which is defined for a set of data xi as (1) where and are respectively average value and standard deviation of a set of x data with sampling size of ns.
For the present data, the g values of five properties are all greater than zero.
It indicates that EMV1 and E are not reasonable models for the present data.
Therefore, scattered data are obtained in Table 1.
Real distributed shape of a set of data can be judged using a so-called statistical parameter, coefficient of skewness, g, which is defined for a set of data xi as (1) where and are respectively average value and standard deviation of a set of x data with sampling size of ns.
For the present data, the g values of five properties are all greater than zero.
It indicates that EMV1 and E are not reasonable models for the present data.
Online since: May 2014
Authors: Shu Yan Zhang, Jin Hong Zhang, Jun Li Jia
In conventional continuous casting secondary cooling water control method on the basis of the proposed adaptive control strategy for water distribution.According to the production characteristics of slab continuous casting machine, the establishment of a dynamic soft reduction model of secondary cooling water control system and online. by introducing water distribution model and control system implementation, Through the adjuster to optimize performance, make the water distribution system in less money subject to meet the technical requirements of good results.
Previous secondary cooling control is through off-line calculation, calculate the amount of water in advance on the basis of the data calls to be controlled, but the data off-line calculation is limited and non-continuous[2-3], which necessarily vary with site conditions, to be able to react more realistic process conditions slab for a steel slab method we use online tracking through the mechanical properties of high-temperature plasticity of various kinds of steel, determine the target slab surface temperature and heat transfer model used to calculate the solidification slab surface temperature, to create a dynamic secondary cooling water model, real-time control of two cold t, improve the slab quality t[4].
Due to reduced modification of instrument number, thus the sharp reduction in the number of spare parts, and also indirectly reduce the cost of production.
Previous secondary cooling control is through off-line calculation, calculate the amount of water in advance on the basis of the data calls to be controlled, but the data off-line calculation is limited and non-continuous[2-3], which necessarily vary with site conditions, to be able to react more realistic process conditions slab for a steel slab method we use online tracking through the mechanical properties of high-temperature plasticity of various kinds of steel, determine the target slab surface temperature and heat transfer model used to calculate the solidification slab surface temperature, to create a dynamic secondary cooling water model, real-time control of two cold t, improve the slab quality t[4].
Due to reduced modification of instrument number, thus the sharp reduction in the number of spare parts, and also indirectly reduce the cost of production.
Online since: September 2017
Authors: Petr Tikhonov, Nadezhda Kovalko, Tatiana Egorova, Marina Kalinina, Maxim Yu. Arsentev, Anastasia Shmigel
Of course the problems such as phase transformations upon delithiation may exist, and to check the data the experimental and computer studies needed.
During operation, the battery based on Li2MnSiO4 undergoes oxidation-reduction reactions: Mn2+ ↔ Mn3+ ↔ Mn4+ [2].
In general, the first selection criterion was the presence of a sufficient amount of manganese ions to enable oxidation-reduction reaction due to insertion/extraction lithium ions and availability of the potentials of these reactions for current electrolytes [1].
The Table 1 shows a good agreement between calculated and experimental data.
Of course the problems such as phase transformations may exist, and to check the data the experimental studies needed.
During operation, the battery based on Li2MnSiO4 undergoes oxidation-reduction reactions: Mn2+ ↔ Mn3+ ↔ Mn4+ [2].
In general, the first selection criterion was the presence of a sufficient amount of manganese ions to enable oxidation-reduction reaction due to insertion/extraction lithium ions and availability of the potentials of these reactions for current electrolytes [1].
The Table 1 shows a good agreement between calculated and experimental data.
Of course the problems such as phase transformations may exist, and to check the data the experimental studies needed.
Online since: July 2022
Authors: Marion Merklein, Jonas Reblitz, Franz Reuther, Ricardo Trân, Verena Kräusel
Introduction
One current global challenge is the reduction of carbon dioxide emissions and energy consumption.
An additional weight reduction can be achieved by the application of tube profiles.
The investigated material data is transferred to a numerical simulation for a deeper analysis.
They observed a reduction of ductility for AA5754 caused by the PLC-effect.
The material data for the W-temper condition obtained from the tensile tests can subsequently be used to implement a material model in a numerical simulation.
An additional weight reduction can be achieved by the application of tube profiles.
The investigated material data is transferred to a numerical simulation for a deeper analysis.
They observed a reduction of ductility for AA5754 caused by the PLC-effect.
The material data for the W-temper condition obtained from the tensile tests can subsequently be used to implement a material model in a numerical simulation.
Online since: October 2014
Authors: Jian Ming Wang, Xiao Chen, Xin Min Hao, Yuan Yang, Ya Fei Guo, Yue Ling Li
Bio-based nylon 56 fibers treated in acetic acid concentration of 100 g/L for 30 minutes have a sharp reduction and almost lost its function at 50 minutes.
All the data were averaged of the 10 sample tests. 1.2.2 Acid resistance test Using constant temperature water-bath water to acid experiment.
The data of lose of breaking strength of three nylon fibers as time goes by are shown in fig.4 and fig.5.
Bio-based nylon 56 fibers treated in acetic acid concentration of 100 g/L for 30 minutes have a sharp reduction and almost lost its function at 50 minutes.
All the data were averaged of the 10 sample tests. 1.2.2 Acid resistance test Using constant temperature water-bath water to acid experiment.
The data of lose of breaking strength of three nylon fibers as time goes by are shown in fig.4 and fig.5.
Bio-based nylon 56 fibers treated in acetic acid concentration of 100 g/L for 30 minutes have a sharp reduction and almost lost its function at 50 minutes.
Online since: December 2013
Authors: Wen Qiang Chao, Liang Zhao Zhong, Yin Zhang, Jian Gang Xiao, Xue Fei Lai, Jun Feng Li, Pei Cong Zhang
Chitosan has good biocompatibility and physiological activity, tourmaline possesses characteristics of generation of anion, reduction of water molecular beam and emission of far infrared radiation, so the two composite materials will hopefully possesses the two excellent properties, thus show good application prospect in the biomedical and cosmetic field.
Tourmaline, (Tourmaline, Tour) chemical general formula can be written as NaR3Al6[Si6O18][BO3]3(OH,F)4, with piezoelectricity and pyroelectricity and other unique physical and chemical properties, possess ability of production of anion, reduction of the water molecular beam, emission of far infrared ray, in recent years is widely applied in functional fiber, textiles, clothing, coating materials, water purification and other fields [3-5].
The liquid absorption and liquid maintenance of composite powder’s test method is as follows: configure PBS buffer (PH=7.4), the composite powder was weighed five parallel samples, the sample was added a certain amount of PBS buffer liquid tube, shake on the table in the constant temperature of 37 ℃ for 48 hours, after remove the test tube and pour to PBS liquid, use filter paper to absorb liquid on the surface of the sample, weighing and record the data.
Then samples will be in a centrifuge for 5 min at a rate of about 3000rd/min for 5 minutes, after absorbing centrifuge liquid out again and weighing and record the relevant data.
Tourmaline, (Tourmaline, Tour) chemical general formula can be written as NaR3Al6[Si6O18][BO3]3(OH,F)4, with piezoelectricity and pyroelectricity and other unique physical and chemical properties, possess ability of production of anion, reduction of the water molecular beam, emission of far infrared ray, in recent years is widely applied in functional fiber, textiles, clothing, coating materials, water purification and other fields [3-5].
The liquid absorption and liquid maintenance of composite powder’s test method is as follows: configure PBS buffer (PH=7.4), the composite powder was weighed five parallel samples, the sample was added a certain amount of PBS buffer liquid tube, shake on the table in the constant temperature of 37 ℃ for 48 hours, after remove the test tube and pour to PBS liquid, use filter paper to absorb liquid on the surface of the sample, weighing and record the data.
Then samples will be in a centrifuge for 5 min at a rate of about 3000rd/min for 5 minutes, after absorbing centrifuge liquid out again and weighing and record the relevant data.