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Online since: November 2011
Authors: Sen Cao, Lei Lei, Yu Bai, Lei Shi, Yan Cao
As an efficient and general method, the optimization and convergence performance of SA algorithm is mainly affected by the problem and several factors.
However, because of calculation complexity and neglect of some actual factors, they are far away from actual applications.
After inputting correct data, the canvas image property of Timage component is generated in a dynamic way and the Gantt chart of the initial solution is also generated.
References [1] Rao Yunqing, Liu Shiping, The study of manufacturing execution system in agile workshop, Chinese Journal of Mechanical Engineering. 13 (2002) 654-657
However, because of calculation complexity and neglect of some actual factors, they are far away from actual applications.
After inputting correct data, the canvas image property of Timage component is generated in a dynamic way and the Gantt chart of the initial solution is also generated.
References [1] Rao Yunqing, Liu Shiping, The study of manufacturing execution system in agile workshop, Chinese Journal of Mechanical Engineering. 13 (2002) 654-657
Online since: April 2023
Authors: Koshiro Mizobe, Takahiro Matsueda, Katsuyuki Kida, Kei Ushizima, Shusuke Kita
Introduction
Many mechanical components are subjected to cyclic stress.
Yajima et al. stated that the properties of martensite affected the fatigue lives of bearing steels, and retained austenite improved the fatigue lives [6].
Sample C was not affected by bending moment because it was located out of loading point.
This indicates that carburizing affected the area from the surface to a 0.1 mm depth.
Watanabe, Effect of Metallographical Factors on the Rolling Fatigue Life of Ball Bearing Steel, Tetsu-to-Hagane, Vol. 54, No. 13, pp. 1353-1366, (1968) (in Japanese)
Yajima et al. stated that the properties of martensite affected the fatigue lives of bearing steels, and retained austenite improved the fatigue lives [6].
Sample C was not affected by bending moment because it was located out of loading point.
This indicates that carburizing affected the area from the surface to a 0.1 mm depth.
Watanabe, Effect of Metallographical Factors on the Rolling Fatigue Life of Ball Bearing Steel, Tetsu-to-Hagane, Vol. 54, No. 13, pp. 1353-1366, (1968) (in Japanese)
Online since: August 2016
Authors: Shi Peng Ruan, Ji Lin Chen, Li Jun Wang, Jin Po Zhai, Chao Liu
In order to obtain the mechanical properties and microstructure of the final requirements, also we need to go through heat treatment and surface treatment after SCM435H cold heading molding, so SCM435H have excellent hardenability and plasticity [5-6], but also need to have enough toughness, In this paper, different austenite grain size of SCM435H hardenability and toughness been analyzed.
2 Experimental materials and test methods
Experimental material selection SCM435H rod, smelting and rolling process: external smelting refining→LF bloom caster billet inspection→heating bloom blooming slab→test→high-pressure water descaling control rolling→controlled cooling→sampling, the interception of wire rod Φ32mm 200mm sample, the chemical composition shown in table 1.
From the perspective of austenite transformation kinetics austenite grain size as the impact of supercooled austenite stability factor, with increasing grain size, the C curve shifted to the right position, reducing the critical quench rate, thereby hardenability increase [9].
Poor impact toughness is the most obvious sign of the impact energy decreases significantly, thus factors have an impact on the impact toughness of brittle materials, such as crystal structure, chemical composition, smelting, steel rolling process and the use of temperature, etc.
By affecting curve fitting, fitting equation obtained as Eq. 1,wherein, Ak represents the impact energy, d represents the austenite grain size.
Microstructures, Mechanical Properties, and StrainHardening Behavior of an Ultrahigh Strength Dual Phase Steel Developed by Intercritical Annealing of Cold-Rolled Ferrite/Martensite[J], METALLURGICAL AND MATERIALS TRANSACTIONS A.46(2015):3052-3062
From the perspective of austenite transformation kinetics austenite grain size as the impact of supercooled austenite stability factor, with increasing grain size, the C curve shifted to the right position, reducing the critical quench rate, thereby hardenability increase [9].
Poor impact toughness is the most obvious sign of the impact energy decreases significantly, thus factors have an impact on the impact toughness of brittle materials, such as crystal structure, chemical composition, smelting, steel rolling process and the use of temperature, etc.
By affecting curve fitting, fitting equation obtained as Eq. 1,wherein, Ak represents the impact energy, d represents the austenite grain size.
Microstructures, Mechanical Properties, and StrainHardening Behavior of an Ultrahigh Strength Dual Phase Steel Developed by Intercritical Annealing of Cold-Rolled Ferrite/Martensite[J], METALLURGICAL AND MATERIALS TRANSACTIONS A.46(2015):3052-3062
Online since: May 2015
Authors: Mohd Amri Sulaiman, Mohd Shahir Kasim, J.B. Saedon, Effendi Mohamad, Mohamad Minhat, Mohamad Hazizan Atan, Jaharah A. Ghani, C.H. Che Haron, M. Hadzley
It has been applied extensively in plastic industry due to good mechanical properties.
The material possesses superior properties that resist high load and corrosion.
Degradation of tool performance not only increase production cost but also affect quality of machined part [2].
All the P-value for all factors found to be less than 5% confident interval.
The steep angle of the graph plane shows the most significant of each factor contribute to tool life.
The material possesses superior properties that resist high load and corrosion.
Degradation of tool performance not only increase production cost but also affect quality of machined part [2].
All the P-value for all factors found to be less than 5% confident interval.
The steep angle of the graph plane shows the most significant of each factor contribute to tool life.
Online since: February 2013
Authors: Romulus Pascu, Roşu Radu Alexandru, Fulga Doru, Duma Iuliana
Sample M2, BM, [Etched B8, 100x]
· In the heat affected zones (HAZ) – austenitic microstructure with heterophasic zones of δ ferrite and complex carbides (Figures 9 and 10)
Figure 9.
Short-term mechanical tests 2.6.1.
Mechanical characteristics Welded sample mark Research area Mechanical characteristics Rp0,2 [N/mm2] Rm [N/mm2] A5 [%] Z [%] Min.
values Max. values 1 BM (NT) 212 218 523 523 55 57 79 79 2 BM (TT) 226 226 524 526 56 56 77 77 TP 347 steel ASTM A376 --- 205 --- 515 --- 35 --- --- --- 1 Welded joints (NT) --- --- 522 526 --- --- --- --- 2 Welded joints (TT) --- --- 525 527 --- --- --- --- Analyzing the values of mechanical properties of TP347 steel and their welded joints, in untreated and in heat-treated states, it is observed that these values fall within the minimum requirements of ASTM A370. 2.6.3.
But, the lateral expansion, EL as a toughness factor in assessing the deformability from the "V" channel has high values, between 5.80% and 6.5% for the base material (NT and TT state) and lower values in the weld zones (NT and TT), between 2.95% and 3.91%.
Short-term mechanical tests 2.6.1.
Mechanical characteristics Welded sample mark Research area Mechanical characteristics Rp0,2 [N/mm2] Rm [N/mm2] A5 [%] Z [%] Min.
values Max. values 1 BM (NT) 212 218 523 523 55 57 79 79 2 BM (TT) 226 226 524 526 56 56 77 77 TP 347 steel ASTM A376 --- 205 --- 515 --- 35 --- --- --- 1 Welded joints (NT) --- --- 522 526 --- --- --- --- 2 Welded joints (TT) --- --- 525 527 --- --- --- --- Analyzing the values of mechanical properties of TP347 steel and their welded joints, in untreated and in heat-treated states, it is observed that these values fall within the minimum requirements of ASTM A370. 2.6.3.
But, the lateral expansion, EL as a toughness factor in assessing the deformability from the "V" channel has high values, between 5.80% and 6.5% for the base material (NT and TT state) and lower values in the weld zones (NT and TT), between 2.95% and 3.91%.
Online since: December 2014
Authors: You Zhen Fang
Testing Design
This test mainly observes effects that factors of electrode pressrue( F ), welding current( I ) and welding time( t ) may bring to the joint property and meanwhile design 3 levels for the 3 factors separately.
The experiment is designed according to four factors and three levels orthogonal table and aims to find out the effects that all factors may bring to testing subjects and distinguish main influencing factors with minor ones then try to seek out better manufacturing conditions or the best combination of the statistics.
factors can be listed from major ones to minor ones as t > O > I > F and the best combination of statistics is F2I3t2O2.
Shrinkage cavity, which could worsen mechanical property of spot-welded joints and probably cause cracks that will lead to maximum durable intensity regression of joints, was formed in later period of nugget solidification (See Figure 7).
Microhardness test of Joint Hardness number of joints is considered as an extraordinarily important indicator to judge quality of joints in researching mechanical property of welding joints because hardness number directly determines anti-deformation and anti-destruction capacity of the joints.
The experiment is designed according to four factors and three levels orthogonal table and aims to find out the effects that all factors may bring to testing subjects and distinguish main influencing factors with minor ones then try to seek out better manufacturing conditions or the best combination of the statistics.
factors can be listed from major ones to minor ones as t > O > I > F and the best combination of statistics is F2I3t2O2.
Shrinkage cavity, which could worsen mechanical property of spot-welded joints and probably cause cracks that will lead to maximum durable intensity regression of joints, was formed in later period of nugget solidification (See Figure 7).
Microhardness test of Joint Hardness number of joints is considered as an extraordinarily important indicator to judge quality of joints in researching mechanical property of welding joints because hardness number directly determines anti-deformation and anti-destruction capacity of the joints.
Online since: September 2016
Authors: Bibhuti Bhusan Biswal, M.V.A. Raju Bahubalendruni, Praniket Prakash Chauhan, Radharani Nayak
This approach helps in keeping a balance between material usages, build time and mechanical properties.
As the properties of cellular structure depends on its relative density, the mechanical properties of honey combs are better than lattice structures.
Therefore filling the internal structures with honeycomb structures would give better mechanical properties.
So, these cellular structure keep a balance between mechanical properties as well as the material consumption.
Ashby, Cellular solids: structure and properties.
As the properties of cellular structure depends on its relative density, the mechanical properties of honey combs are better than lattice structures.
Therefore filling the internal structures with honeycomb structures would give better mechanical properties.
So, these cellular structure keep a balance between mechanical properties as well as the material consumption.
Ashby, Cellular solids: structure and properties.
Online since: August 2013
Authors: Yong Chun Cheng, Hui Li Ma, Jian Ping Huang, Peng Zhang, Jing Lin Tao
Further, asphalt mortar bending test at low temperature were done to verify the good mechanical performance of diatomite asphalt mortar.
But as one of the most important components of asphalt mixture, asphalt mortar’s good or bad macro-road performance is the key factor affecting the performance of asphalt mixture [6, 7].
The softening point of 7% diatomite asphalt mortar increases 9.78%, while 7% mine filler only improves 4.27%, which is clear that the softening point of diatomite asphalt mortar is much higher than mine filler, indicating that diatomite is more conducive to improve the high-temperature properties of asphalt mortar.
Mechanical test of mine filler and diatomite asphalt mortar Anti-bending performance test of mine filler and diatomite asphalt mortar.
Wang: Research on viscosity property of asphalt mortar, Journal of Traffic and Transportation Engineering(2008), p. 49-52
But as one of the most important components of asphalt mixture, asphalt mortar’s good or bad macro-road performance is the key factor affecting the performance of asphalt mixture [6, 7].
The softening point of 7% diatomite asphalt mortar increases 9.78%, while 7% mine filler only improves 4.27%, which is clear that the softening point of diatomite asphalt mortar is much higher than mine filler, indicating that diatomite is more conducive to improve the high-temperature properties of asphalt mortar.
Mechanical test of mine filler and diatomite asphalt mortar Anti-bending performance test of mine filler and diatomite asphalt mortar.
Wang: Research on viscosity property of asphalt mortar, Journal of Traffic and Transportation Engineering(2008), p. 49-52
Online since: January 2016
Authors: Alexandru Gruia, Fazal Um Min Allah
Ethanol can be blended with biodiesel fuel to improve its physical and chemical properties.
Physical and chemical properties of investigated blends are within the limits of European biodiesel standard EN 14214 [3, 4 and 5].
Physical and chemical properties of biodiesel comply with the standard EN 14214.
Operating conditions, specifications of diesel generator and properties of blends are the main factors affecting the emission performance.
Jai-In, Solubility of a diesel-biodiesel-ethanol blend, its fuel properties and its emission characteristics from diesel engine, Fuel. 86 (2007) 1053-1061
Physical and chemical properties of investigated blends are within the limits of European biodiesel standard EN 14214 [3, 4 and 5].
Physical and chemical properties of biodiesel comply with the standard EN 14214.
Operating conditions, specifications of diesel generator and properties of blends are the main factors affecting the emission performance.
Jai-In, Solubility of a diesel-biodiesel-ethanol blend, its fuel properties and its emission characteristics from diesel engine, Fuel. 86 (2007) 1053-1061
Online since: August 2009
Authors: Chuan Zhen Huang, Han Lian Liu, Bin Fang, Hong Mei Cheng, Ting Ting Zhou
How to enhance mechanical
properties of ceramic tool materials becomes imperative.
However, mechanical properties are dependent on many factors including components, content and fabrication process, which make it difficult to develop ceramic materials.
The macro mechanical properties of composite ceramics are intimately related to their microstructures.
Computer-based multi-scale coupling model is applied to simulate the microstructure and mechanical properties of ceramic materials in order to study the influence of components, microstructures and fabrication process on mechanical properties.
In order to optimize fabrication process and achieve excellent mechanical properties, combining simulation methods with actual fabrication process and associating mechanical properties with microstructure is critical and forms the focus of the future study.
However, mechanical properties are dependent on many factors including components, content and fabrication process, which make it difficult to develop ceramic materials.
The macro mechanical properties of composite ceramics are intimately related to their microstructures.
Computer-based multi-scale coupling model is applied to simulate the microstructure and mechanical properties of ceramic materials in order to study the influence of components, microstructures and fabrication process on mechanical properties.
In order to optimize fabrication process and achieve excellent mechanical properties, combining simulation methods with actual fabrication process and associating mechanical properties with microstructure is critical and forms the focus of the future study.