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Online since: August 2014
Authors: Arne Kromm, Thomas Kannengiesser
In general the residual stress state of a welded structure is affected by the interaction of mechanical, thermal and material factors.
In practice, the superposition of these three factors results in characteristic residual stress distributions controlled by the dominating effect in each case [4-5].
The mechanical properties of the steel are shown in Table 1.
Table 1: Mechanical properties of the base material Rm [MPa] Rp0.2 [MPa] A5 [%] Z [%] 620-795 485 20 48 Fig. 1: Schematic of the joint configuration showing the position of the heating mats used for heat treatment The parameters shown in Table 2 were kept constant for all test welds.
Withers, On the evolution of local material properties and residual stress in a three-pass SA508 steel weld, Acta Mater. 60 (2012) 3268-3278
In practice, the superposition of these three factors results in characteristic residual stress distributions controlled by the dominating effect in each case [4-5].
The mechanical properties of the steel are shown in Table 1.
Table 1: Mechanical properties of the base material Rm [MPa] Rp0.2 [MPa] A5 [%] Z [%] 620-795 485 20 48 Fig. 1: Schematic of the joint configuration showing the position of the heating mats used for heat treatment The parameters shown in Table 2 were kept constant for all test welds.
Withers, On the evolution of local material properties and residual stress in a three-pass SA508 steel weld, Acta Mater. 60 (2012) 3268-3278
Online since: December 2012
Authors: Bin Zhao, Pei Wen Hao
Some steps, avoiding clay being carried into the shaking feeder by rubbles, and installing dust collector devices, etc, can reduce the content of 0.075mm particles in aggregates.
2.3 Control the Content of Elongated and Flaky Particles
The producing of elongated and flaky particles is effected to the characteristics of mineral aggregate, mechanical properties, processing technology and so on.
Three factors here affected the ability of vibrating screen, including the exciting force of oscillating screen, the inclination angle of oscillating screen and the changing aggregate flows.
The important factors affecting the above process are weighing accuracy of electronic scale and the “carry-over”.
The weighing accuracy of asphalt is an important factor that affects the quality of asphalt mixtures.
The influence factors,s analysis of weighing precision for batch asphalt mixing plant, Highways & Transportation in Inner Mongolia, 78(1), P17-18, 2003
Three factors here affected the ability of vibrating screen, including the exciting force of oscillating screen, the inclination angle of oscillating screen and the changing aggregate flows.
The important factors affecting the above process are weighing accuracy of electronic scale and the “carry-over”.
The weighing accuracy of asphalt is an important factor that affects the quality of asphalt mixtures.
The influence factors,s analysis of weighing precision for batch asphalt mixing plant, Highways & Transportation in Inner Mongolia, 78(1), P17-18, 2003
Online since: September 2014
Authors: Hilmi Mukhtar, Marjan Farnam, Azmi Mohd Shariff
This review paper discusses the properties of glassy polymer membranes and their performance in gas separation.
Glassy polymers can exhibit a wide range of elastic properties depending on the testing conditions.
Several factors related to chemical structure are known to affect the glass transition temperature.
Jones and Koros [13] reported that by pyrolysis of aromatic polyimides, good membranes in terms of separation and mechanical properties will be achieved.
Tant, et al., In Structure and Properties of Glassy Polymers, American Chemical Society, Washington, DC, 2012
Glassy polymers can exhibit a wide range of elastic properties depending on the testing conditions.
Several factors related to chemical structure are known to affect the glass transition temperature.
Jones and Koros [13] reported that by pyrolysis of aromatic polyimides, good membranes in terms of separation and mechanical properties will be achieved.
Tant, et al., In Structure and Properties of Glassy Polymers, American Chemical Society, Washington, DC, 2012
Online since: September 2013
Authors: Ying Zi Yin, Yan Zhang, Gen Tian Zhao
Through anglicizing, ultimate strength of short column under axial compression in different steel ratio; influenced factors of ultimate strength of short column and directly effected column about ultimate strength.
In order to get the relatively accurate mechanical performance index of the steel plate, the longitudinal resistance strain gages are pasted on the sample in advance.
The material property tests are took in a 600 kN hydraulic tensile testing machine in Inner Mongolia university of science and technology structure engineering laboratory.
Table4 Parameters of Specimens for Load-Contingency Curve Pillar Number Yield Load ultimate load secant modulus secant modulus PECC-1 1672 2108 0.79 0.68 0.18 1.7 PECC-2 1384 1867 0.74 0.62 0.1 1.6 PECC-3 1618 2558 0.63 0.79 0.22 1.3 PECC-4 1313 1688 0.78 0.48 0.15 1.1 PECC-5 1615 2382 0.68 0.71 0.05 2.3 PECC-6 1989 2664 0.75 0.75 0.24 1.3 PECC-7 1769 2559 0.69 0.76 0.21 1.4 PECC-8 1499 2178 0.69 0.58 0.03 3.3 PECC-9 2149 3110 0.69 0.78 0.09 1.4 Factors influencing the bearing capacity of the PEC short column 4.1 Factors affecting the concrete strength increasing in the PEC short column Due to the constraints in three directions by steel, the concrete of PEC column is restrained by the horizontal tie in a direction, so in the whole process, the concrete strength is higher than in the uniaxial compression.
The major factors affecting the improvement of concrete strength are the overhang width-to-thickness ratio of structural steel flange and the horizontal bar spacing, which is associated with in the increase coefficient of concrete strength of formula (1).
In order to get the relatively accurate mechanical performance index of the steel plate, the longitudinal resistance strain gages are pasted on the sample in advance.
The material property tests are took in a 600 kN hydraulic tensile testing machine in Inner Mongolia university of science and technology structure engineering laboratory.
Table4 Parameters of Specimens for Load-Contingency Curve Pillar Number Yield Load ultimate load secant modulus secant modulus PECC-1 1672 2108 0.79 0.68 0.18 1.7 PECC-2 1384 1867 0.74 0.62 0.1 1.6 PECC-3 1618 2558 0.63 0.79 0.22 1.3 PECC-4 1313 1688 0.78 0.48 0.15 1.1 PECC-5 1615 2382 0.68 0.71 0.05 2.3 PECC-6 1989 2664 0.75 0.75 0.24 1.3 PECC-7 1769 2559 0.69 0.76 0.21 1.4 PECC-8 1499 2178 0.69 0.58 0.03 3.3 PECC-9 2149 3110 0.69 0.78 0.09 1.4 Factors influencing the bearing capacity of the PEC short column 4.1 Factors affecting the concrete strength increasing in the PEC short column Due to the constraints in three directions by steel, the concrete of PEC column is restrained by the horizontal tie in a direction, so in the whole process, the concrete strength is higher than in the uniaxial compression.
The major factors affecting the improvement of concrete strength are the overhang width-to-thickness ratio of structural steel flange and the horizontal bar spacing, which is associated with in the increase coefficient of concrete strength of formula (1).
Online since: January 2017
Authors: Jia Jiu Diao
However, because the properties of composites depend on process crafts badly, unreasonable processing technology will lead forming difficult, and then redesign is needed.
This affects production efficiency badly in PCB enterprise.
The rapid infiltration production technology not only improves the performance of composite materials, but also has important significance to improve the interfacial properties of the composites.
The interfacial state which generally characterized by materials’ infiltration property between them is an important factor that affected the performance of composite materials.
The existence of these defects not only affected the quality and the appearance of the products but also critically decreased the reliability, electric property, water resisting property, weather fastness, mechanical property and other performances of the material.
This affects production efficiency badly in PCB enterprise.
The rapid infiltration production technology not only improves the performance of composite materials, but also has important significance to improve the interfacial properties of the composites.
The interfacial state which generally characterized by materials’ infiltration property between them is an important factor that affected the performance of composite materials.
The existence of these defects not only affected the quality and the appearance of the products but also critically decreased the reliability, electric property, water resisting property, weather fastness, mechanical property and other performances of the material.
Online since: July 2006
Authors: Marcin Rosiński, Andrzej Michalski
These properties make Ni-Al a promising potential
material for high-temperature applications.
Fortunately, these disadvantageous properties can be overcome by producing materials with a nano-crystalline structure reinforced with uniformly distributed ceramic particles [1-3].
However high temperature processing often results in grain growth and, as a consequence, the material loses the unique properties which are closely related to the nano-crystalline structure.
The work was concerned with examining the properties of the nano-crystalline NiAl sintered compacts and NiAl-TiC composites consolidated using the Pulse Plasma Sintering (PPS) method, developed at the Faculty of Materials Science and Engineering of Warsaw University of Technology.
Figure 5 shows how the TiC phase content affects the hardness and the critical stress intensity factor (KIC).
Fortunately, these disadvantageous properties can be overcome by producing materials with a nano-crystalline structure reinforced with uniformly distributed ceramic particles [1-3].
However high temperature processing often results in grain growth and, as a consequence, the material loses the unique properties which are closely related to the nano-crystalline structure.
The work was concerned with examining the properties of the nano-crystalline NiAl sintered compacts and NiAl-TiC composites consolidated using the Pulse Plasma Sintering (PPS) method, developed at the Faculty of Materials Science and Engineering of Warsaw University of Technology.
Figure 5 shows how the TiC phase content affects the hardness and the critical stress intensity factor (KIC).
Online since: August 2014
Authors: Stefan Gaspar, Ján Pasko, Ján Majerník
The observed properties are the tensile properties of newly created material, namely yield stress, stress at break.
Such retroactive implementation is subject to the investigation of properties of newly created materials and the testing whether desired properties fall within tolerance bands selected for the product concerned.[1][2] Material Used Two materials were used for the tests: Starex HF-0660I and Senosan® 3000X.
As it is clear from measured values the added secondary material has no serious affect on tensile properties only to a certain percentage extent.
When injecting, plastics degrades under heat and gradually changes its properties.
Vol. 739 (2013), p. 233-237. – ISSN 1022-6680 [KULIK, Vladimír - PAŠKO, Ján - GAŠPÁR, Štefan] [5] Influence of technological factors of die casting on mechanical properties of castings from silumin / Stefan Gaspar, Jan Pasko - 2013.
Such retroactive implementation is subject to the investigation of properties of newly created materials and the testing whether desired properties fall within tolerance bands selected for the product concerned.[1][2] Material Used Two materials were used for the tests: Starex HF-0660I and Senosan® 3000X.
As it is clear from measured values the added secondary material has no serious affect on tensile properties only to a certain percentage extent.
When injecting, plastics degrades under heat and gradually changes its properties.
Vol. 739 (2013), p. 233-237. – ISSN 1022-6680 [KULIK, Vladimír - PAŠKO, Ján - GAŠPÁR, Štefan] [5] Influence of technological factors of die casting on mechanical properties of castings from silumin / Stefan Gaspar, Jan Pasko - 2013.
Online since: May 2020
Authors: Shinichi Hata, Takahiro Yoshizumi, Satoshi Hoshino, Mio Gotsubo, Yukihide Shiraishi, Naoki Toshima
The addition of inorganic materials with high thermoelectric properties is a popular approach to modulate the performance of carbon nanotube (CNT), but, the representative hybridization of CNT and toxic Te or Bi is not practical considering safety.
Here, we report a CNT film including charge-transfer complex nanoparticles, which has higher generality and thermoelectric properties.
The thermoelectric properties of the composite films prepared from acetone or acetonitrile with low solubility for TTF-TCNQ are superior to SGCNT, and their PF values are 28.9 µWm-1K-2 and 35.5 µWm-1K-2.
This reveals that the solvents affect greatly the dispersion state of TTF-TCNQ in SWCNTs, i.e., a nano-sized TTF-TCNQ occurs when the solvent is NMP.
We demonstrated that this affects the size of the charge transfer complex TTF-TCNQ is better for nanoparticles than for bulk, and that TTF-TCNQ is a better carrier promoter.
Here, we report a CNT film including charge-transfer complex nanoparticles, which has higher generality and thermoelectric properties.
The thermoelectric properties of the composite films prepared from acetone or acetonitrile with low solubility for TTF-TCNQ are superior to SGCNT, and their PF values are 28.9 µWm-1K-2 and 35.5 µWm-1K-2.
This reveals that the solvents affect greatly the dispersion state of TTF-TCNQ in SWCNTs, i.e., a nano-sized TTF-TCNQ occurs when the solvent is NMP.
We demonstrated that this affects the size of the charge transfer complex TTF-TCNQ is better for nanoparticles than for bulk, and that TTF-TCNQ is a better carrier promoter.
Online since: August 2022
Authors: Muhammad Anis-ur-Rehman, Haris Farooq Kiani
The Electrical properties were studied by using two-probe method.
This issue affects all aspects of economic and social development.
Calcium cobaltites are intrinsic semiconductor that takes on extrinsic properties when we doped with impurities that change its electrical and thermal properties [9].
First reason is the activated oxygen vacancies, a large number of charge carriers, and temperature dependent diffusion are all factors that contribute to this effect.
Charge carrier, defects, phase change and impurities all these factors influenced the Seebeck coefficient of a material [15].
This issue affects all aspects of economic and social development.
Calcium cobaltites are intrinsic semiconductor that takes on extrinsic properties when we doped with impurities that change its electrical and thermal properties [9].
First reason is the activated oxygen vacancies, a large number of charge carriers, and temperature dependent diffusion are all factors that contribute to this effect.
Charge carrier, defects, phase change and impurities all these factors influenced the Seebeck coefficient of a material [15].
Online since: October 2010
Authors: Xiao Jun Tian, Cheng Dong Wu, Ke Xu, Ying Zhang, Zai Li Dong
With respect to the assembly of carbon nanotube field effect transistor, the
dielectrophoresis technology is adopted, which assembles SWCNTs between the micro-electrodes,
SWCNTs are affected by the electrophoretic force which is carried out by the related theoretical
analysis in a nonuniform electric field.
AFM scanning and electrical properties of SWCNTs show that the method can achieve the effective assembly of carbon nanotube field effect transistor.
Introduction A single-wall carbon nanotube (SWCNT) has been found as promising materials for nanoscale mechanical structures, because of their typical one-dimensional structure and unique properties [1].
L// was the depolarization factor, σ was the conductivity, and ω=2πf was the angular frequency of the alternating current electric field.
The deposition time was 10s, which affected the number of SWCNTs assembled.
AFM scanning and electrical properties of SWCNTs show that the method can achieve the effective assembly of carbon nanotube field effect transistor.
Introduction A single-wall carbon nanotube (SWCNT) has been found as promising materials for nanoscale mechanical structures, because of their typical one-dimensional structure and unique properties [1].
L// was the depolarization factor, σ was the conductivity, and ω=2πf was the angular frequency of the alternating current electric field.
The deposition time was 10s, which affected the number of SWCNTs assembled.