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Online since: October 2012
Authors: Peng Li, Yu Shao
The location of site , the speed and direction of wind, surface structure, vegetation, soil and water affect the overall situation.
The human survival, health, nutrition and work efficiency, all of these factors are closely linked with the sun.
This pressure difference associates with architectural form, the angle of building and wind, the surrounding building layout and other factors.
From the perspective of high-rise public building energy consumption, to improve the thermal insulation properties of the building envelope structure is the most important measure for energy saving design.
The protective measure for the thermal radiation on the external wall is the use of materials with the absorption and emission properties in hot conditions.
The human survival, health, nutrition and work efficiency, all of these factors are closely linked with the sun.
This pressure difference associates with architectural form, the angle of building and wind, the surrounding building layout and other factors.
From the perspective of high-rise public building energy consumption, to improve the thermal insulation properties of the building envelope structure is the most important measure for energy saving design.
The protective measure for the thermal radiation on the external wall is the use of materials with the absorption and emission properties in hot conditions.
Online since: November 2023
Authors: Sung Il Kim, Jewoong Lee, Youngroc Im
In this paper, the mechanical properties resulting from the difference in the microstructure of the 780MPa grade hot-rolled and HDG(Hot Dip Galvanized) CP steels, especially the important stretch-flangeability characteristics as they are frequently used as control arm parts, will be discussed.
Table 2 shows tensile properties and HER (Hole Expansion Ratio) of uncoated and coated hot-rolled 780CP steels.
Reducing the hardness difference between phases in microstructural constituents is a key factor for improving stretch flangeability of AHSS.
Tensile properties and HER of PO/HGI 780CP steels Steels YS, MPa UTS, MPa YE, % T-El, % HER, % Uncoated 780CP 697 798 - 18 61 Coated 780CP 742 795 1.1 17 72 Fig. 3.
In addition, heat treatment prior to Zn-coating is required to perform HDG, which may change the mechanical properties of uncoated and coated materials.
Table 2 shows tensile properties and HER (Hole Expansion Ratio) of uncoated and coated hot-rolled 780CP steels.
Reducing the hardness difference between phases in microstructural constituents is a key factor for improving stretch flangeability of AHSS.
Tensile properties and HER of PO/HGI 780CP steels Steels YS, MPa UTS, MPa YE, % T-El, % HER, % Uncoated 780CP 697 798 - 18 61 Coated 780CP 742 795 1.1 17 72 Fig. 3.
In addition, heat treatment prior to Zn-coating is required to perform HDG, which may change the mechanical properties of uncoated and coated materials.
Online since: September 2018
Authors: Marina Polyakova, Eduard Golubchik
It is connected with increasing customer demands both to quality and properties of metal items especially for automobile and pipe manufacturing spheres.
Methodology The developed methodology is based on the possibility of operational quality indices management by their adaptation both to external and internal factors affecting on the technological system.
In this connection the influence of these factors completely or partially may be uncertain.
Hence, all these factors form the basics for construction the roll system for powder rolling.
Conclusions Powder rolling makes it possible to get long length product in a wide range of properties.
Methodology The developed methodology is based on the possibility of operational quality indices management by their adaptation both to external and internal factors affecting on the technological system.
In this connection the influence of these factors completely or partially may be uncertain.
Hence, all these factors form the basics for construction the roll system for powder rolling.
Conclusions Powder rolling makes it possible to get long length product in a wide range of properties.
Online since: February 2019
Authors: Gennady G. Mikhailov, Igor V. Bakin, Valery A. Golubtsov, Ivan V. Ryabchikov, Ludmila E. Dresvyankina
These modifiers allow to influence both the metal structure and the shape, phase composition and physical properties of nonmetallic inclusions.
The modifying effect of alkaline-earth elements on the properties of steel is undeniable.
Data on the effects of alloys with alkaline-earth elements on the properties of metals are given, as well as technological features of the use of complex alloys with alkaline-earth metals in steelmaking.
The presence of strontium in a complex alloy can also have an effect on the physicomechanical properties of steel.
Poznyak, Structure formation and formation of the properties of steels and alloys, Kiev, Naukova Dumka, 1993
The modifying effect of alkaline-earth elements on the properties of steel is undeniable.
Data on the effects of alloys with alkaline-earth elements on the properties of metals are given, as well as technological features of the use of complex alloys with alkaline-earth metals in steelmaking.
The presence of strontium in a complex alloy can also have an effect on the physicomechanical properties of steel.
Poznyak, Structure formation and formation of the properties of steels and alloys, Kiev, Naukova Dumka, 1993
Online since: September 2008
Authors: Royale S. Underhill, Krystal A. Stevens, Gary C. Fisher
Power supplies are often the limiting factor for operation of many portable electronic
devices.
No change in properties were observed.
The mechanical properties of a polymer matrix can be engineered to allow the polymer to act as a resetting stress.
Dynamic Mechanical Analysis.
Farrell: in Processing-Structure-Mechanical Property Relations in Composite Materials, edited by L.
No change in properties were observed.
The mechanical properties of a polymer matrix can be engineered to allow the polymer to act as a resetting stress.
Dynamic Mechanical Analysis.
Farrell: in Processing-Structure-Mechanical Property Relations in Composite Materials, edited by L.
Online since: April 2014
Authors: Xia Qing Zhu
The resistance strain gauge is a key component of dynamic weighing system, but because of the resistance strain gauge temperature properties and long-term stability and so on some technical indicators can not meet the high accuracy of performance requirements for weighing sensor.
Variable, nonlinear and the random interference factors are contained in dynamic weighing process.
When the weighing speed is accelerated, vibration caused by the material impact and uncertainty of material in the air will affect the weighing precision, so in order to improve the weighing accuracy, sometimes it will have to lower the weighing speed.
There are many uncertain factors weighing process, such as mechanical parts have inertia characteristics, the weighing signal has a lag and the falling material has an impact on the scale body etc.
Because the instability caused by the incoming flow of the material and the pure lag from the mechanical inertia, it is very difficult to improve the control precision.
Variable, nonlinear and the random interference factors are contained in dynamic weighing process.
When the weighing speed is accelerated, vibration caused by the material impact and uncertainty of material in the air will affect the weighing precision, so in order to improve the weighing accuracy, sometimes it will have to lower the weighing speed.
There are many uncertain factors weighing process, such as mechanical parts have inertia characteristics, the weighing signal has a lag and the falling material has an impact on the scale body etc.
Because the instability caused by the incoming flow of the material and the pure lag from the mechanical inertia, it is very difficult to improve the control precision.
Online since: March 2008
Authors: Dun Wen Zuo, Min Wang, Hun Guo, Guo Xing Tang, Yang Jing Guo
Analysis of Optimal Clamping Schemes for Aero-Multi-Frame Monolithic
Components
Hun Guo
1,2,a, Dunwen Zuo
1, Guoxing Tang
2, Min Wang
1 and Yangjing Guo3
1
College of Mechanical & Electrical Engineering, Nanjing University of Aero & Astron,
Nanjing, China, 210016
2
School of Mechanical & Electrical Engineering, Changzhou Institute of Technology,
Changzhou, China, 213002
3
Beijing Huayuanyitong Heating Supply Technology Development Co., Ltd.
Many researchers emphasize on investigating how clamping points, clamping order, and clamping force affect in-process dimensional precision and setting accuracy [5-8].
But they only focus on single factor, the combined factor of clamping force and milling force has been not considered.
The geometric dimension, its property value and the working parameters are listed in Table 1.
This study conclusion has been validated by the actual production. 3) But in this study other factors except for clamping force have been not considered, so this model need to still perfect further so that it is the purpose of this publication to address those specific needs of studying workpiece fatigue resistance in next study.
Many researchers emphasize on investigating how clamping points, clamping order, and clamping force affect in-process dimensional precision and setting accuracy [5-8].
But they only focus on single factor, the combined factor of clamping force and milling force has been not considered.
The geometric dimension, its property value and the working parameters are listed in Table 1.
This study conclusion has been validated by the actual production. 3) But in this study other factors except for clamping force have been not considered, so this model need to still perfect further so that it is the purpose of this publication to address those specific needs of studying workpiece fatigue resistance in next study.
Online since: January 2005
Authors: Anjali A. Athawale, Malini Bapat
Introduction :
BaZrO3, a refractory ceramic has good mechanical strength and chemical stability
with a small coefficient of thermal expansion.
Newer methods are thus being tailored to produce nanocrystalline ceramics having sinterability at lower temperatures, phase homogeneity, fine particle size, unique magnetic, electrical, mechanical and optical properties.
From the experiments, it appears that a number of factors affect the variation in the reaction product formation, predominantly heat evolved, maximum reaction temperature, local O2 and CO2 concentration, redox reactions and heats of formation and decomposition of reactants and products.
Further investigating studies are required to co-relate these factors and predict course of reaction.
Newer methods are thus being tailored to produce nanocrystalline ceramics having sinterability at lower temperatures, phase homogeneity, fine particle size, unique magnetic, electrical, mechanical and optical properties.
From the experiments, it appears that a number of factors affect the variation in the reaction product formation, predominantly heat evolved, maximum reaction temperature, local O2 and CO2 concentration, redox reactions and heats of formation and decomposition of reactants and products.
Further investigating studies are required to co-relate these factors and predict course of reaction.
Online since: February 2012
Authors: Qing Hai Wang, Lin Na Zhang, Peng Zheng, Feng Xia Zhao
Uncertainty Evaluation of SEM-based Nanoroughness Measurement
Fengxia Zhao 1, a, Qinghai Wang 2,b, Linna Zhang 1,c and Peng Zheng 1,d
1 School of Mechanical Engineering, Zhengzhou University, Zhengzhou, P.
China, 450001 2 Henan Mechanical and Electrical Vocational College, Zhengzhou, P.
The SEM first focuses an electron beam whose cross-sectional radius is very small (5-7nm) and then scans a sample in a raster way, producing information which is related to the properties of the sample.
Because an SEM image is formed from the interaction of incident electrons and a sample material, there are several factors, such as the wave character of incident electrons, magnification, scanning speed and resolution, etc, which contribute to uncertainties in the precision of nanoroughness measurements.
Suppose every two uncertainty factors above mentioned are non-correlated, then according to uncertainty combination equation presented in ISO GUM [6] the total uncertainty of SEM-based nanoroughness metrology can be derived from (1) Where is the uncertainty of extraction operation, is the uncertainty of filtration operation and is the uncertainty of fit operation.
China, 450001 2 Henan Mechanical and Electrical Vocational College, Zhengzhou, P.
The SEM first focuses an electron beam whose cross-sectional radius is very small (5-7nm) and then scans a sample in a raster way, producing information which is related to the properties of the sample.
Because an SEM image is formed from the interaction of incident electrons and a sample material, there are several factors, such as the wave character of incident electrons, magnification, scanning speed and resolution, etc, which contribute to uncertainties in the precision of nanoroughness measurements.
Suppose every two uncertainty factors above mentioned are non-correlated, then according to uncertainty combination equation presented in ISO GUM [6] the total uncertainty of SEM-based nanoroughness metrology can be derived from (1) Where is the uncertainty of extraction operation, is the uncertainty of filtration operation and is the uncertainty of fit operation.
Online since: August 2011
Authors: Chun Fu Gao, Zhi Yong Luo, Bing Wang, Xin Sheng He
In addition, SRI has developed the Rolls robot by using bending actuator with multifunctional dielectric elastomer, which used the single, flexible bending actuator instead of mechanical joint, shown in Fig. 1(b).
Based on the advantages of dielectric bending elastomer actuator, the bending elastomer actuator is designed and its property is tested and analyzed by experiments to provide instruction for the research of this type actuator.
Fig.3 Working principle of bending actuator Fig.4 Sketch of the coiling process of the bending actuator a) Before switch-on b) After switch-off Fig.5 Real object of the bending actuator Experiment and Analysis The principle factors which affect the performance of the bending actuator include the parameters of compressed spring (such as diameter of spring wire d, diameter of spring D), the prestretching rate of dielectric elastomer film , the precompression of spring and so on.
The prestretching rate of dielectric elastomer film and the voltage difference between the electrodes are the factors for consideration.
So the characteristics of electromechanical coupling and mechanics need to be studied in depth to improve the property of the actuator.
Based on the advantages of dielectric bending elastomer actuator, the bending elastomer actuator is designed and its property is tested and analyzed by experiments to provide instruction for the research of this type actuator.
Fig.3 Working principle of bending actuator Fig.4 Sketch of the coiling process of the bending actuator a) Before switch-on b) After switch-off Fig.5 Real object of the bending actuator Experiment and Analysis The principle factors which affect the performance of the bending actuator include the parameters of compressed spring (such as diameter of spring wire d, diameter of spring D), the prestretching rate of dielectric elastomer film , the precompression of spring and so on.
The prestretching rate of dielectric elastomer film and the voltage difference between the electrodes are the factors for consideration.
So the characteristics of electromechanical coupling and mechanics need to be studied in depth to improve the property of the actuator.