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Online since: December 2013
Authors: Mohd Amri Lajis, Ahmad Razlan Yusoff, Mohamad Syahmi Shahrom
Three factors selected are chip size, operating temperature and operating pressure with three levels for each factor.
It is reported that the material loses its properties during casting process due to oxidation.
A higher number of oxygen amount improves the quality of microstructure and material properties.
In this study, ANOVA is used to examine the influence of factors on quality characteristic.
ANOVA and main effect analysis indicate the most significant parameter affecting the UTS value.
It is reported that the material loses its properties during casting process due to oxidation.
A higher number of oxygen amount improves the quality of microstructure and material properties.
In this study, ANOVA is used to examine the influence of factors on quality characteristic.
ANOVA and main effect analysis indicate the most significant parameter affecting the UTS value.
Online since: October 2014
Authors: Traian Grămescu, Constantin Cărăușu
The research allowed establishing the factors able to have a major influence on tool wear phenomenon and obtaining thus a more complete image concerning the machinability of grey iron used for castings.
From the point of view of machinability criteria listed above, on can conclude that an increase in value which gives some high physical and mechanical properties of cast iron is accompanied by a decrease of machinability by classical cutting methods.
In this way, each test sample had approximately constant mechanical characteristics.
Chemical compositions and physical-mechanical properties of test samples used for cast iron machinability evaluation Sample P1 P2 P3 P4 P5 P6 P7 C 3.2...3.4 3.1...3.3 3.0...3.2 3.3...3.4 3.4...3.5 3.2...3.3 2.25 Si 1.7...1.9 1.2...1.3 1.6...1.8 2.0...2.17 2.5...2.6 2.1...2.4 1.4 Mn 0.5...0.6 0.4...0.5 0.7...0.9 0.7...0.9 0.5...0.55 0.5...0.6 0.8...1.0 S 0.05...0.06 0.07...0.09 0.04...0.06 0.05...0.06 0.07...0.1 0.05...0.06 0.02...0.06 P 0.16...0.18 0.06...0.1 0.1...0.12 0.05...0.1 0.08...0.1 0.09...0.1 0.1...0.12 Cu 0.1...0.4 - - - - - - Cr 0.3...0.5 - 0.9...1.0 - - - 12.2 Ni - - 3.0...3.15 - - - - Mo - - 0.4...0.5 - - - 0.5...0.6 V - - 0.1 - - - 0.2...0.4 R [N/mm2] 195 256 325 470 630 200 347 δ % - - - 8 5 - - HB [N/mm2] 105...125 171...178 275...280 164...166 180...189 134...152 347...371 Table 2.
Pearlitic predominant structures, characterized by higher hardness in comparison with the ferritic structures, determined a more intense tool wear, negatively affecting the tool life.
From the point of view of machinability criteria listed above, on can conclude that an increase in value which gives some high physical and mechanical properties of cast iron is accompanied by a decrease of machinability by classical cutting methods.
In this way, each test sample had approximately constant mechanical characteristics.
Chemical compositions and physical-mechanical properties of test samples used for cast iron machinability evaluation Sample P1 P2 P3 P4 P5 P6 P7 C 3.2...3.4 3.1...3.3 3.0...3.2 3.3...3.4 3.4...3.5 3.2...3.3 2.25 Si 1.7...1.9 1.2...1.3 1.6...1.8 2.0...2.17 2.5...2.6 2.1...2.4 1.4 Mn 0.5...0.6 0.4...0.5 0.7...0.9 0.7...0.9 0.5...0.55 0.5...0.6 0.8...1.0 S 0.05...0.06 0.07...0.09 0.04...0.06 0.05...0.06 0.07...0.1 0.05...0.06 0.02...0.06 P 0.16...0.18 0.06...0.1 0.1...0.12 0.05...0.1 0.08...0.1 0.09...0.1 0.1...0.12 Cu 0.1...0.4 - - - - - - Cr 0.3...0.5 - 0.9...1.0 - - - 12.2 Ni - - 3.0...3.15 - - - - Mo - - 0.4...0.5 - - - 0.5...0.6 V - - 0.1 - - - 0.2...0.4 R [N/mm2] 195 256 325 470 630 200 347 δ % - - - 8 5 - - HB [N/mm2] 105...125 171...178 275...280 164...166 180...189 134...152 347...371 Table 2.
Pearlitic predominant structures, characterized by higher hardness in comparison with the ferritic structures, determined a more intense tool wear, negatively affecting the tool life.
Online since: June 2011
Authors: Ammar A. Mustafa, Khalid A. S. Al-Khateeb, Ahmad Faris Ismail
Mechanical strength is an important factor that has to be analyzed for clinical success of dental restorations.
However, these applications are limited by their mechanical properties.
In addition, aluminum Polycarboxylate is formed after 24 hours and it improves mechanical properties [13] Some studies found that lithium fluoride might adversely affect the compressive strength but it may elongate the setting time [14]. 3M Ketac GIC and Fuji IX have exhibited faster setting time than test-GIC and more viscosity and that might explain the improved mechanical properties of these two materials.
Mechanical behavior of glass ionomer cements affected by long-term storage in water.
Mechanical properties in Restorative dental materials. 10th.
However, these applications are limited by their mechanical properties.
In addition, aluminum Polycarboxylate is formed after 24 hours and it improves mechanical properties [13] Some studies found that lithium fluoride might adversely affect the compressive strength but it may elongate the setting time [14]. 3M Ketac GIC and Fuji IX have exhibited faster setting time than test-GIC and more viscosity and that might explain the improved mechanical properties of these two materials.
Mechanical behavior of glass ionomer cements affected by long-term storage in water.
Mechanical properties in Restorative dental materials. 10th.
Online since: February 2012
Authors: Komson Jirapattarasilp, Sujitra Butsabong
Thus, scale can affect the workpiece by creep phenomena and damage and extensive wear of tool that affects the surface quality of products. [1-2].
Other study was presented the mechanical removal of scale especially in wire rod production. [5] The cold working including annealing condition are important process and also has relatively to scale formation.
The annealing has been the process for recovery the property of metal from cold work.
These factors were tested by pilot study before running the actual experiment.
Meanwhile, the interactions between three factors were found.
Other study was presented the mechanical removal of scale especially in wire rod production. [5] The cold working including annealing condition are important process and also has relatively to scale formation.
The annealing has been the process for recovery the property of metal from cold work.
These factors were tested by pilot study before running the actual experiment.
Meanwhile, the interactions between three factors were found.
Online since: August 2013
Authors: Ji Xin Yang, Kun Huang
Analysis shows that use Solid65 element can simulate the nonlinear mechanical properties of the reinforced concrete beam under different reinforcement ratio better.
So we think that the finite element software can be used to calculate the mechanical behavior of the reinforced concrete.
According to the existing regulations, although it can satisfy the requirement of the use and the security, sometimes it considers the economic factors less, causing a waste of materials.
So, if we can simulate the mechanical characteristics of the reinforced concrete structures by finite element software, it will help us to optimized the design and save more money.
Considering the number of elements will affect the calculation speed and convergence, we will reduce the unit quantity and speed up the calculation by the symmetry of structure modeling.
So we think that the finite element software can be used to calculate the mechanical behavior of the reinforced concrete.
According to the existing regulations, although it can satisfy the requirement of the use and the security, sometimes it considers the economic factors less, causing a waste of materials.
So, if we can simulate the mechanical characteristics of the reinforced concrete structures by finite element software, it will help us to optimized the design and save more money.
Considering the number of elements will affect the calculation speed and convergence, we will reduce the unit quantity and speed up the calculation by the symmetry of structure modeling.
Online since: June 2013
Authors: Xiao Liang Wang, Xiao Yuan Lian, Lu Yao
The related engineering factors were reduced by Rough Set theory and the main factors of the drilling process were obtained.
So when the fault symptoms become more, it will greatly increase the processing time of the system, thus affecting the efficiency of fault diagnosis, which happens to be the advantage of RS theory.
is a finite non-empty set, called domain. ,, is the collection of properties. , are the condition attributes and the decision attributes.
According to the study of Vapnik, the selection of the kernel function has little relationship of the SVM performance, while the parameters of the kernel and the error penalty factor C are the main factors affecting the SVM performance[6].
Mechanical Systems and Signal Processing, 2007, 21(6): 2560-2574
So when the fault symptoms become more, it will greatly increase the processing time of the system, thus affecting the efficiency of fault diagnosis, which happens to be the advantage of RS theory.
is a finite non-empty set, called domain. ,, is the collection of properties. , are the condition attributes and the decision attributes.
According to the study of Vapnik, the selection of the kernel function has little relationship of the SVM performance, while the parameters of the kernel and the error penalty factor C are the main factors affecting the SVM performance[6].
Mechanical Systems and Signal Processing, 2007, 21(6): 2560-2574
Online since: February 2012
Authors: Lei Chen, Zu Ming Hu, Guo Ping Tang, Jun Rong Yu, Jing Zhu, Ling Ling Zhu
To characterize the permeation property, the testing of water flux was carried out andit was found thatwith the increase of thickness, concentration and molecular weight, a decrease in water flux occurred.Moreover,the pore structureinvestigated by Field emission scanning electron microscopy (FESEM)wasconsistent withthe above phenomena.It is known that the pore size is affected by two factors: crystallization rate and the diffusion rate of diluent.
In addition, the cloud points, crystallization temperature under different conditions were obtained thus to provide important information to prepare microporous membrane with better mechanical properties for appropriate application.
Permeation property Pure water permeation measurement was carried out to characterize the permeation properties of various UHMWPE membranes and the results were showed in the Fig.2a) and b).
Determination of influence factors It was known that the pore size was affected by two factors: crystallization rate as well as the diffusion rate of diluent and that slower crystallization rate, faster diffusion rate would lead to larger pore size [11,12].
In addition, the cloud points, crystallization temperature under different conditions were obtained thus to provide important information to prepare microporous membrane with better mechanical properties for appropriate application.
Permeation property Pure water permeation measurement was carried out to characterize the permeation properties of various UHMWPE membranes and the results were showed in the Fig.2a) and b).
Determination of influence factors It was known that the pore size was affected by two factors: crystallization rate as well as the diffusion rate of diluent and that slower crystallization rate, faster diffusion rate would lead to larger pore size [11,12].
Online since: February 2011
Authors: Wim De Waele, Álvaro Martínez-Valle, José M. Martínez-Jiménez, Patrick Goes, Koen Faes
Thermodynamics - Electromagnetics: the temperature changes in the workpiece will alter its electromagnetic properties (temperature dependence of conductivity).
5.
Thermodynamics - Solid Mechanics: the temperature increase will lead to thermal strains, and will affect the mechanical properties of the workpiece material (Johnson-Cook thermal softening).
These factors were fixed to 0 s-1 and 2e-7 s, respectively, for the simulations described in the following section with steel S235.
As it can be observed from Eq. 8, the influence of the thermal effects on the mechanical material properties during the high velocity forming process must not be disregarded.
[5] Dehra, M.S.: High Velocity Formability and Factors Affecting it.
Thermodynamics - Solid Mechanics: the temperature increase will lead to thermal strains, and will affect the mechanical properties of the workpiece material (Johnson-Cook thermal softening).
These factors were fixed to 0 s-1 and 2e-7 s, respectively, for the simulations described in the following section with steel S235.
As it can be observed from Eq. 8, the influence of the thermal effects on the mechanical material properties during the high velocity forming process must not be disregarded.
[5] Dehra, M.S.: High Velocity Formability and Factors Affecting it.
Online since: February 2013
Authors: Chao Ling Song, Feng Kui Yin, Jin Xiao Dou, Jiang Long Yu
Pore structure of activated-carbon including pore size, pore volume, pore size distribution and specific surface area are the main factors to affect the desulfurization efficiency.
Temperature is one of the important factors affecting desulfurization efficiency.
Temperature is one of the important factors to affect the desulfurization efficiency.
Owing to well-developed pore structure, high specific surface area, low production cost and good mechanical properties, activated-chars can be used as a new type of sulfur dioxide adsorbent or sorbent supporters.
Physical and chemical properties of the activated-char, operating conditions (feed gas composition, temperature), and the amount of loaded metal can affect the desulfurization efficiency.
Temperature is one of the important factors affecting desulfurization efficiency.
Temperature is one of the important factors to affect the desulfurization efficiency.
Owing to well-developed pore structure, high specific surface area, low production cost and good mechanical properties, activated-chars can be used as a new type of sulfur dioxide adsorbent or sorbent supporters.
Physical and chemical properties of the activated-char, operating conditions (feed gas composition, temperature), and the amount of loaded metal can affect the desulfurization efficiency.
Online since: November 2021
Authors: Mohamed Moustafa Ibrahim, Hamdy Mohamed Mohamed
Ancient archaeological sites contain numerous pottery objects that suffered from different deterioration factors.
The porosity of the pottery has a strong effect on its physical and mechanical properties.
It is necessary before cleaning to identify the type of pottery, its mechanical properties, its components, and the nature of surface dirt.
Because of its properties as chemical inertness, non-wettability, transparency, mechanical resistance, and environmental stability, Paraloid B-72 has been used for conservation purposes since1950 [35, 36].
Conclusion Many methods were used to define the main components of pottery and its deterioration factors.
The porosity of the pottery has a strong effect on its physical and mechanical properties.
It is necessary before cleaning to identify the type of pottery, its mechanical properties, its components, and the nature of surface dirt.
Because of its properties as chemical inertness, non-wettability, transparency, mechanical resistance, and environmental stability, Paraloid B-72 has been used for conservation purposes since1950 [35, 36].
Conclusion Many methods were used to define the main components of pottery and its deterioration factors.