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Online since: March 2019
Authors: Fu Zhen Xuan, Shan Tung Tu, Shu Xian Lin, Yu Hui Huang
However, the lacking of stress corrosion tests data for nuclear steam turbine low-pressure rotors produced and used in China greatly restricts the domestic development of stress corrosion research on nuclear steam turbines [2].
After experiments, the specimen were cleaned again and the area reduction of specimens was measured.
The results can be characterized by one or more parameters, including the area surrounded by the stress-strain curve, the fracture time and the area reduction and so on.
As a whole, the elongation (or total strain) of the three low-pressure rotor steels in corrosive environment is significantly lower than that in air with a reduction of about 12%.
And the results of area surrounded by stress-strain curves, fracture time and area reduction were recorded as kA, kT and kR, respectively, as presented in Table 3.
After experiments, the specimen were cleaned again and the area reduction of specimens was measured.
The results can be characterized by one or more parameters, including the area surrounded by the stress-strain curve, the fracture time and the area reduction and so on.
As a whole, the elongation (or total strain) of the three low-pressure rotor steels in corrosive environment is significantly lower than that in air with a reduction of about 12%.
And the results of area surrounded by stress-strain curves, fracture time and area reduction were recorded as kA, kT and kR, respectively, as presented in Table 3.
Online since: May 2005
Authors: Sami Chatti, Uwe Dirksen, Matthias Kleiner, Marco Schikorra
The input data
generally consists of geometrical data, profile data, material characteristics, framework structures,
loads, boundary conditions, etc.
It stores all application data internally, saves and loads the STEP-based data model, and if data is queried from one sub-module, which still not exists, the data administration sub-module is responsible for its determination.
Because the STEPbased PSS-data model used by RSTAB already supports major data of the required product data model, it is extended by an additional EXPRESS Schema.
Thus, missing data like flow curve of the material, machine and tools data, friction data, and the simulation results from ANSYS and PROFI are defined.
The centrally stored data reduces data redundancies and data inconsistencies.
It stores all application data internally, saves and loads the STEP-based data model, and if data is queried from one sub-module, which still not exists, the data administration sub-module is responsible for its determination.
Because the STEPbased PSS-data model used by RSTAB already supports major data of the required product data model, it is extended by an additional EXPRESS Schema.
Thus, missing data like flow curve of the material, machine and tools data, friction data, and the simulation results from ANSYS and PROFI are defined.
The centrally stored data reduces data redundancies and data inconsistencies.
Online since: December 2012
Authors: Xiao Lan Yang, Ji Feng Liu, Zeng Wen Xiao, Fang Min Xu
The upper machine is used to interact with the single-chip microcomputer, and the data can be saved and download.
Host computer is connected by the data cable.
VB6.0 software is used to write the data acquisition process and deal with the collection data, then the information which system needs can be gotten.
The debugging operation is divided into preset program numerical value, data acquisition, data sorting, and data analysis of four stages.
Analysis of measured data.
Host computer is connected by the data cable.
VB6.0 software is used to write the data acquisition process and deal with the collection data, then the information which system needs can be gotten.
The debugging operation is divided into preset program numerical value, data acquisition, data sorting, and data analysis of four stages.
Analysis of measured data.
Online since: July 2015
Authors: Massimo Durante, Antonio Formisano, Antonello Astarita, Antonino Squillace, Luca Boccarusso, F. Capece Minutolo, Antonio Langella, Luigi Carrino
Squillace1,h
1Department of Chemical, Materials and Production Engineering, University of Naples Federico II, Naples, Italy
aaformisa@unina.it, bantonello.astarita@unina.it, cluca.boccarusso@unina.it, dcapece@unina.it, eluigi.carrino@unina.it, fmdurante@unina.it, gantgella@unina.it, hsquillac@unina.it
Keywords: Hot incremental forming, Forming limit curves, FE analyses
Abstract: Nowadays, the need of developing high flexible forming processes matches with the need of weight reduction.
Table 1: Mechanical characteristics of the grade 1 titanium sheets evaluated through the tensile tests T [°C] Young modulus [GPa] Yield strenght [MPa] UTS [MPa] Ultimate elongation [-] 25 103 221 467 0.30 250 103 128 275 0.35 400 103 110 225 0.37 Concerning the forming forces, the analysis of experimental data shows that they decrease with the increasing of the temperature.
The experimental tests allowed to highlight a notable reduction of the forming forces depending on the temperature; in particular, the reduction reached the 50% at a temperature of 400°C.
Table 1: Mechanical characteristics of the grade 1 titanium sheets evaluated through the tensile tests T [°C] Young modulus [GPa] Yield strenght [MPa] UTS [MPa] Ultimate elongation [-] 25 103 221 467 0.30 250 103 128 275 0.35 400 103 110 225 0.37 Concerning the forming forces, the analysis of experimental data shows that they decrease with the increasing of the temperature.
The experimental tests allowed to highlight a notable reduction of the forming forces depending on the temperature; in particular, the reduction reached the 50% at a temperature of 400°C.
Online since: June 2018
Authors: Kevin Lawless, Min Seok Kang, Veena Misra, Bong Mook Lee
The FGA process leads to improve VT instability and high field effect mobility due to reduction of the interface states density as well as traps by passivating the dangling bonds and active traps in the Lanthanum Silicate dielectrics.
The gate leakage current is reduced after FGA process and this reduction in leakage current is attributed to the better interface as well as the presence of lower electric field originated from the high dielectric constant of LaSiOx (k = 8 ~14) [11].
Large reduction in VT shifts was observed with the addition of high temperature RTA-FGA process.
The information, data, or work presented herein was funded in part by the Office of Energy Efficiency and Renewable Energy (EERE), U.S.
The gate leakage current is reduced after FGA process and this reduction in leakage current is attributed to the better interface as well as the presence of lower electric field originated from the high dielectric constant of LaSiOx (k = 8 ~14) [11].
Large reduction in VT shifts was observed with the addition of high temperature RTA-FGA process.
The information, data, or work presented herein was funded in part by the Office of Energy Efficiency and Renewable Energy (EERE), U.S.
Online since: August 2013
Authors: Bin Xie, Zheng He Song, Hao Li
Simulation results suggest that: in this HET, the output torque and traction vary in a large range with the variations in the operation modes and SOC level of the battery; in the common interval of SOC (0.4~0.7), compared with the traditional tractor, HET can achieve larger output torque with a fuel consumption reduction of 18% ~20% in discharge mode; with the capability of keeping the battery charge-discharge stage stable and guaranteeing the SOC variation in a small range, the controller meets with the requirements of plowing operation and benefits the stability of the tractor power and the extension of battery life cycle.
The hybrid electric tractors (HET) is capable of enabling the diesel work in an optimal area by controlling the output torque of engine and electronic motor to achieve fuel economy and emission reduction [1].
Tab.1 Parameters of HET and battery variable Data Total weight m, kg 3675 Power radius of driving wheel Rr, m 0.734 Axle base L, m 2.366 The distance between center of gravity and back axle a, m 0.71 rolling resistance coefficient f, 1 0.1 Number of ploughshare moldboard plow z, 1 5 Width of Ploughshare b, m 0.3 The battery module M, 1 6 Max voltage Vmax, V 16.5 Min voltage Vmin, V 9.5 Rated power Ce, Ah 25 Fig. 4 Properties of battery and engine Fig. 5 Tilling depth and soil specific resistance Results and Analysis of the Performance Simulation.
The charge-discharge process of power battery is stable in a small range that benefits the stability of the tractor power and the extension of battery lifecycle. 18%-20% fuel consumption reduction can be achieved when the battery runs in the appropriate range.
The hybrid electric tractors (HET) is capable of enabling the diesel work in an optimal area by controlling the output torque of engine and electronic motor to achieve fuel economy and emission reduction [1].
Tab.1 Parameters of HET and battery variable Data Total weight m, kg 3675 Power radius of driving wheel Rr, m 0.734 Axle base L, m 2.366 The distance between center of gravity and back axle a, m 0.71 rolling resistance coefficient f, 1 0.1 Number of ploughshare moldboard plow z, 1 5 Width of Ploughshare b, m 0.3 The battery module M, 1 6 Max voltage Vmax, V 16.5 Min voltage Vmin, V 9.5 Rated power Ce, Ah 25 Fig. 4 Properties of battery and engine Fig. 5 Tilling depth and soil specific resistance Results and Analysis of the Performance Simulation.
The charge-discharge process of power battery is stable in a small range that benefits the stability of the tractor power and the extension of battery lifecycle. 18%-20% fuel consumption reduction can be achieved when the battery runs in the appropriate range.
Online since: August 2004
Authors: Joon Hyun Lee, Vincent Luk, Jung Taek Kim, Sang Geun Lee, Na Young Lee, Chi Bum Bahn, Ji Hyun Kim, Il Soon Hwang
By this process, we identify performance and applicability of chosen sensors
and also obtain base data for analyzing measured value in unknown conditions.
The extent of pipe thickness reduction can be monitored by Non-Destructive Evaluation (NDE) techniques.
This test shows clearly the relations between force and vibration mode, and it would be base data to compare to the result obtained in the real situation.
For this purpose, specimens with different thickness are used in the test, and thus we could get preliminary data of the test condition similar to FAC occurrence.
Since we don't know what would be the characteristics of the vibration mode in the specific system, we tried to break down the phenomena case by case to obtain the baseline data here.
The extent of pipe thickness reduction can be monitored by Non-Destructive Evaluation (NDE) techniques.
This test shows clearly the relations between force and vibration mode, and it would be base data to compare to the result obtained in the real situation.
For this purpose, specimens with different thickness are used in the test, and thus we could get preliminary data of the test condition similar to FAC occurrence.
Since we don't know what would be the characteristics of the vibration mode in the specific system, we tried to break down the phenomena case by case to obtain the baseline data here.
Online since: August 2007
Authors: Young Gun Ko, Dong Hyuk Shin, Kyung Tae Park, Kion Kwon, Duck Young Hwang, Chong Soo Lee
An analysis of
the mechanical data in light of the standard deformation mechanisms revealed that deformation of
the sample after 4 passes was governed by dislocation climb while grain boundary sliding attributed
to LTS of the sample after 8 passes.
For 5154 Al alloy, ECAP was preformed up to 4 passes with route Bc and subsequent cold rolling was carried out up to a total reduction of 70 % with 0.2 mm reduction per rolling pass.
The mechanical data of the alloy after 4 passes were fitted into a straight line with a slope of ~ 0.2, i.e.
Contrarily, the mechanical data of the alloy after 8 passes exhibited the sigmoidal behavior manifested by the presence of the three distinct regions. m was ∼0.1 at low (Region I, ε& < 3×10 -4 s-1) and high strain rates (Region III, 2×10-3 s-1 < &ε ).
These include (a) the mechanical data implied that the deformation of the ECAP sample was governed by dislocation viscous glide while that of the ECAP+CR (70 %) sample was dominated by GBS and (b) the deformation in the ECAP sample was localized at the initial deformation stage and it became more severely localized as deformation proceeded, but GBS Fig. 5 TEM micrographs of (a) the ECAP sample and (b) the ECAP+CR (70%) sample of 5154 Al occurred predominantly from the initial deformation stage of the ECAP+CR (70 %) sample, resulting relatively uniform deformation throughout the sample. 10 -5 10 -4 10 -3 10 -2 10 -1 10 0 0 200 400 600 800 1000 1200 elongation to failure , % initial strain rate , s -1 modified 5154 Al T = 723K ECAP ECAP+CR 10 -6 10 -5 10 -4 10 -3 10 -2 10 -1 10 0 10 1 10 100 2 200 0.33 1 0.45 1 stress , MPa strain rate , s -1 Al-3.2Mg-0.13Sc T = 723 K ECAP
For 5154 Al alloy, ECAP was preformed up to 4 passes with route Bc and subsequent cold rolling was carried out up to a total reduction of 70 % with 0.2 mm reduction per rolling pass.
The mechanical data of the alloy after 4 passes were fitted into a straight line with a slope of ~ 0.2, i.e.
Contrarily, the mechanical data of the alloy after 8 passes exhibited the sigmoidal behavior manifested by the presence of the three distinct regions. m was ∼0.1 at low (Region I, ε& < 3×10 -4 s-1) and high strain rates (Region III, 2×10-3 s-1 < &ε ).
These include (a) the mechanical data implied that the deformation of the ECAP sample was governed by dislocation viscous glide while that of the ECAP+CR (70 %) sample was dominated by GBS and (b) the deformation in the ECAP sample was localized at the initial deformation stage and it became more severely localized as deformation proceeded, but GBS Fig. 5 TEM micrographs of (a) the ECAP sample and (b) the ECAP+CR (70%) sample of 5154 Al occurred predominantly from the initial deformation stage of the ECAP+CR (70 %) sample, resulting relatively uniform deformation throughout the sample. 10 -5 10 -4 10 -3 10 -2 10 -1 10 0 0 200 400 600 800 1000 1200 elongation to failure , % initial strain rate , s -1 modified 5154 Al T = 723K ECAP ECAP+CR 10 -6 10 -5 10 -4 10 -3 10 -2 10 -1 10 0 10 1 10 100 2 200 0.33 1 0.45 1 stress , MPa strain rate , s -1 Al-3.2Mg-0.13Sc T = 723 K ECAP
Online since: September 2013
Authors: Nida Chaimoon, Chareonporn Lertsatitthanakorn, Krit Chaimoon
Data recorded included room temperature, inside and outside surfaces temperatures of all walls, and solar intensity.
They include a reduction in construction time and cost.
Data were recorded using a data logger and sampled every 5 min during 24 h.
to the temperature data recorded during the day, the corresponding conduction heat transfer rate was the calculated and shown in Fig. 7.
Therefore, the mean energy consumption reduction corresponding to a 1°C increase of the set-point (from 22 to28°C) is about 6.14%.
They include a reduction in construction time and cost.
Data were recorded using a data logger and sampled every 5 min during 24 h.
to the temperature data recorded during the day, the corresponding conduction heat transfer rate was the calculated and shown in Fig. 7.
Therefore, the mean energy consumption reduction corresponding to a 1°C increase of the set-point (from 22 to28°C) is about 6.14%.
Online since: June 2011
Authors: Zong Cai Deng, Jian Hui Li, Ying Li, Zhao Zhong Chang
Test phenomena are described, experimental data are analyzed and compared, and the effect of the axial compression ratio and stirrup reinforcement ratio on the seismic behavior is studied.
Table 2 summarizes the results of the cyclic tests, it can be seen from Table 2 that (1) the rebar corrosion causes the reduction of bearing capacity for the un-strengthened columns, however, the yield load of the corroded columns strengthened with hybrid FRP sheets is decreased by 7.8%~10.4% compared to the corresponding strengthened un-corroded columns, but the maximum load is slightly increased by 1.2%~6.1%, which indicate that strengthening with hybrid FRP sheets can make up the reduction of bearing capacity caused by rebar corrosion, and lead to the maximum bearing capacity of the strengthened corroded column up to same level with the strengthened un-corroded column, even higher. (2) With the increase of axial compressive ratio, the strengthening effect of hybrid FRP sheets is more remarkable. (3) When the axial compressive ratio is same, with the increase of stirrup space, the bearing capacity of the specimens is decreased by 5.0%~14.8%.
Fig. 1 shows the hysteresis curves, it can be observed from Fig.1 that the un-strengthened corroded columns show poor hysteresis response due to rebar corrosion resulting in low lateral load and ductility, especially under high axial compressive ratio, the reduction of bearing capacity and rigidity is very distinct after the maximum lateral load is obtained, the failure of the corroded columns may change from ductile failure of the un-corroded column to brittle failure.
Table 2 summarizes the results of the cyclic tests, it can be seen from Table 2 that (1) the rebar corrosion causes the reduction of bearing capacity for the un-strengthened columns, however, the yield load of the corroded columns strengthened with hybrid FRP sheets is decreased by 7.8%~10.4% compared to the corresponding strengthened un-corroded columns, but the maximum load is slightly increased by 1.2%~6.1%, which indicate that strengthening with hybrid FRP sheets can make up the reduction of bearing capacity caused by rebar corrosion, and lead to the maximum bearing capacity of the strengthened corroded column up to same level with the strengthened un-corroded column, even higher. (2) With the increase of axial compressive ratio, the strengthening effect of hybrid FRP sheets is more remarkable. (3) When the axial compressive ratio is same, with the increase of stirrup space, the bearing capacity of the specimens is decreased by 5.0%~14.8%.
Fig. 1 shows the hysteresis curves, it can be observed from Fig.1 that the un-strengthened corroded columns show poor hysteresis response due to rebar corrosion resulting in low lateral load and ductility, especially under high axial compressive ratio, the reduction of bearing capacity and rigidity is very distinct after the maximum lateral load is obtained, the failure of the corroded columns may change from ductile failure of the un-corroded column to brittle failure.