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Online since: August 2015
Authors: Fyodor I. Panteleenko, Igor V. Miroshin, Oleg A. Ostanin, Valeriy Yu. Blumenstein
The particle displacement until it reaches the front boundary of the deformation site AG is not accompanied by deformation; therefore, its properties match the initial (original) properties of a workpiece.
It is commonly known that to solve problems of TI mechanics one should know the properties of an original metal, which are set by a strengthening curve and a plasticity diagram, both of which are plotted based on routine test findings.
(4) Here tºt acts as a generalized criterion depending on the deformation site parameters, which, in their turn, are determined by engineering aspects; a1, b1 are factors which depend on physical, mechanical and geometric parameters of workpieces; с1 is an equating factor; b2, c2 are factors which depend on the conditions of current stressing and which are determined by the AE signal [21].
To do this, one has to experimentally determine the values of factors in their principal dependency (Eq. 4) and how they affect the connection between the mechanical state of the surface layer and energy parameters of acoustic emission signals.
On the one hand, the study revealed the nature of accumulation of mechanical properties in the surface layer with regard to technological inheritance and, on the other hand, it established that the power of recorded AE signals is interrelated with the properties of the mechanical state. 2.
It is commonly known that to solve problems of TI mechanics one should know the properties of an original metal, which are set by a strengthening curve and a plasticity diagram, both of which are plotted based on routine test findings.
(4) Here tºt acts as a generalized criterion depending on the deformation site parameters, which, in their turn, are determined by engineering aspects; a1, b1 are factors which depend on physical, mechanical and geometric parameters of workpieces; с1 is an equating factor; b2, c2 are factors which depend on the conditions of current stressing and which are determined by the AE signal [21].
To do this, one has to experimentally determine the values of factors in their principal dependency (Eq. 4) and how they affect the connection between the mechanical state of the surface layer and energy parameters of acoustic emission signals.
On the one hand, the study revealed the nature of accumulation of mechanical properties in the surface layer with regard to technological inheritance and, on the other hand, it established that the power of recorded AE signals is interrelated with the properties of the mechanical state. 2.
Online since: May 2021
Authors: Paola Scarfato, Luciano Di Maio, Loredana Incarnato, Arianna Pietrosanto
Mechanical properties were evaluated in the machine direction (MD).
Mechanical Properties.
These results highlight that the mechanical performances of the investigated blends are affected by the viscosity ratio and the tacticity of the two polymer melts more than by the individual polymer properties.
Summary In this work, the blending of two commercial types of PLA with PBAT showed that the mechanical performances of these blends were affected by the viscosity ratio and by the tacticity of the polymers, more than by the individual component properties.
Both these factors led to a finer morphology and higher interfacial adhesion between the homo-phases that was traduced in the better mechanical performance of the resulting blend.
Mechanical Properties.
These results highlight that the mechanical performances of the investigated blends are affected by the viscosity ratio and the tacticity of the two polymer melts more than by the individual polymer properties.
Summary In this work, the blending of two commercial types of PLA with PBAT showed that the mechanical performances of these blends were affected by the viscosity ratio and by the tacticity of the polymers, more than by the individual component properties.
Both these factors led to a finer morphology and higher interfacial adhesion between the homo-phases that was traduced in the better mechanical performance of the resulting blend.
Online since: September 2022
Authors: Milan Holicky, Miroslav Sýkora, Vitali Nadolski
Adjusted Partial Factors
EN 1990 [8] provides the general guidelines for updating partial factors.
The Gamma distribution makes it possible to reflect the changes in the mechanical properties of steels and the variation of geometric dimensions of structural members.
The standards indicate lognormal, normal, or Weibull distributions as appropriate models for material properties [3, 8] while a normal distribution is commonly applied for dimensions.
No defects are affecting structural reliability at the Ultimate Limit States.
Sýkora, Reliability Approaches Affecting the Sustainability of Concrete Structures, Sustainability, vol. 13, no. 5, 2021, doi: 10.3390/su13052627
The Gamma distribution makes it possible to reflect the changes in the mechanical properties of steels and the variation of geometric dimensions of structural members.
The standards indicate lognormal, normal, or Weibull distributions as appropriate models for material properties [3, 8] while a normal distribution is commonly applied for dimensions.
No defects are affecting structural reliability at the Ultimate Limit States.
Sýkora, Reliability Approaches Affecting the Sustainability of Concrete Structures, Sustainability, vol. 13, no. 5, 2021, doi: 10.3390/su13052627
Online since: August 2011
Authors: Nordin Yahaya, Arman Abdullah, Norhazilan Md Noor, Kar Sing Lim
Cold cut method was applied to remove heat affected zone on the coupon which might cause changes in properties of the material.
Hence, there are other principal factors that dominate the corrosion process at all sites.
The measured metal loss of the coupon which buried underground is mathematically caused by so many factors including soil chemical contents and other third party factors such as pollution.
This is in line with the previous statement where soil engineering properties may pose minor influence on corrosion rate, hence not the most influential factors.
Other factors (such as chemical content, pH) may contribute more in this case.
Hence, there are other principal factors that dominate the corrosion process at all sites.
The measured metal loss of the coupon which buried underground is mathematically caused by so many factors including soil chemical contents and other third party factors such as pollution.
This is in line with the previous statement where soil engineering properties may pose minor influence on corrosion rate, hence not the most influential factors.
Other factors (such as chemical content, pH) may contribute more in this case.
Online since: April 2014
Authors: Peng Cheng Zhai, Li Sheng Liu, Ben Huang
Unfortunately, the poor mechanical properties caused by weak van der Waals bonding between Te1-Te1 layers of two adjacent quintuples does set a limitation to commercial applications.[2, 3] On the other hand, it seems that the mechanical properties of Bi2Te3 may play an important role in its production.
Though these negative factors may impact the deformation of breakage, they have mild effect on elastic stage.
Actually, all the calculated mechanical properties parameters and the stress-strain curves have been processed referred to the atomic configuration.
However, for shearing, though the direction of external load can affect the mechanical properties, it seems not to cause any transformation in the mechanism of deformation.
And other factors such as temperature effect and strain rate effect should be considered as well.
Though these negative factors may impact the deformation of breakage, they have mild effect on elastic stage.
Actually, all the calculated mechanical properties parameters and the stress-strain curves have been processed referred to the atomic configuration.
However, for shearing, though the direction of external load can affect the mechanical properties, it seems not to cause any transformation in the mechanism of deformation.
And other factors such as temperature effect and strain rate effect should be considered as well.
Online since: July 2015
Authors: Muhammad Sarwar, Mohd Amin bin Abd Majid
In any welding process the input parameters have an influence on joint’s mechanical properties.
By varying the input process parameters combinations, the output would be different welded joints with significant variations in their mechanical properties.
Competent, experienced engineering and supervision are required to successfully obtain the mechanical properties that can be realized with the CSEF steels.
All the other factors were controlled and maintained per requirements and the welding was finalized as per the procedure.
PWHT at temperature of 760°C for 2 hours has good influence on mechanical properties because the hardness decreases and turns out to be uniformly distributed.
By varying the input process parameters combinations, the output would be different welded joints with significant variations in their mechanical properties.
Competent, experienced engineering and supervision are required to successfully obtain the mechanical properties that can be realized with the CSEF steels.
All the other factors were controlled and maintained per requirements and the welding was finalized as per the procedure.
PWHT at temperature of 760°C for 2 hours has good influence on mechanical properties because the hardness decreases and turns out to be uniformly distributed.
Online since: October 2014
Authors: Jian Ming Wang, Xiao Chen, Xin Min Hao, Yuan Yang, Ya Fei Guo, Yue Ling Li
The factors of acid concentration, temperature and time affect the mechnical behavior of the fibers of nylon 56 ,nylon6 and nylon 66.
Inappropriate acidic conditions may cause changes in the structure of fibers, damage the fibers, and poor the mechanical properties.
The influence of different factors on fracture strength of nylon fibers is shown in Fig. 1~3.
Combined with fig.1~3, we can indicate that temperature, processing time and content of acetic acid are all variables that affect mechanical properties of nylon fibers, and temperature and alkali concentration have larger effect on the fiber strength when compared with effect of processing time.
Conclusion Temperature and concentration play the main role on the acid resistant among the factors that influence acid resistant of nylon fibers: temperature, time, and concentration of acid.
Inappropriate acidic conditions may cause changes in the structure of fibers, damage the fibers, and poor the mechanical properties.
The influence of different factors on fracture strength of nylon fibers is shown in Fig. 1~3.
Combined with fig.1~3, we can indicate that temperature, processing time and content of acetic acid are all variables that affect mechanical properties of nylon fibers, and temperature and alkali concentration have larger effect on the fiber strength when compared with effect of processing time.
Conclusion Temperature and concentration play the main role on the acid resistant among the factors that influence acid resistant of nylon fibers: temperature, time, and concentration of acid.
Online since: February 2018
Authors: Son Tung Pham
Sand production is a complicated physical process depending on rock mechanical properties and flow of fluid in the reservoir.
Parameters affecting sand production have been discussed for decades.
The criterion for sanding is: CBHP≥ 3σ1-σ2-U2-A-poA2-A (1) The model predicts the rate of sand production by utilizing the non-dimensionalized concepts of Loading Factor, LF (near-wellbore formation stress normalized by strength), Reynolds number (Re) and water production factor.
In addition, the study also gives detailed calculation steps for the two hydro–mechanical models.
Papanastasiou, Hydro-mechanical erosion models for sand production, Int.
Parameters affecting sand production have been discussed for decades.
The criterion for sanding is: CBHP≥ 3σ1-σ2-U2-A-poA2-A (1) The model predicts the rate of sand production by utilizing the non-dimensionalized concepts of Loading Factor, LF (near-wellbore formation stress normalized by strength), Reynolds number (Re) and water production factor.
In addition, the study also gives detailed calculation steps for the two hydro–mechanical models.
Papanastasiou, Hydro-mechanical erosion models for sand production, Int.
Online since: August 2012
Authors: Kai Lin, Li Qun Ma, Yi Ding, Hong Qi Shi
The properties and precipitation rules of secondary phases generated during isothermal aging of duplex stainless steels and factors affecting the precipitates were reviewed in this article.
The considerable reduction of mechanical properties and corrosion resistance of DSS would be detected because of these phases.
In this article, considering secondary phases’ influence to macroscopic properties of DSS, the properties and precipitation rules of secondary phases generated during isothermal aging of duplex stainless steels and factors affecting the precipitates were reviewed.
Renton, Effect of ageing on phase evolution and mechanical properties of a high tungsten super-duplex stainless steel, Materials Science and Engineering A. 535 (2012) 281-289
Ghosh, Effect of 475 ◦C embrittlement on the mechanical properties of duplex stainless steel, Materials Science and Engineering A 508 (2009) 1-14.
The considerable reduction of mechanical properties and corrosion resistance of DSS would be detected because of these phases.
In this article, considering secondary phases’ influence to macroscopic properties of DSS, the properties and precipitation rules of secondary phases generated during isothermal aging of duplex stainless steels and factors affecting the precipitates were reviewed.
Renton, Effect of ageing on phase evolution and mechanical properties of a high tungsten super-duplex stainless steel, Materials Science and Engineering A. 535 (2012) 281-289
Ghosh, Effect of 475 ◦C embrittlement on the mechanical properties of duplex stainless steel, Materials Science and Engineering A 508 (2009) 1-14.
Online since: June 2014
Authors: Huan Rao, Yi Zhang, Kang Yun Wu
Imbibition is effected by many factors, including the reservoir rock wettability, reservoir properties, fluid properties and environmental factors.
What factors affect it?
What factors restrict the imbibition oil recovery?
Therefore, capillary force and imbibition recovery efficiency are affected by many factors, such as reservoir wettability.
The properties of oil reservoir affect recovery efficiency largely, such as permeability, porosity, matrical length and shape, initial water saturation, and other factors that are seldom considered.
What factors affect it?
What factors restrict the imbibition oil recovery?
Therefore, capillary force and imbibition recovery efficiency are affected by many factors, such as reservoir wettability.
The properties of oil reservoir affect recovery efficiency largely, such as permeability, porosity, matrical length and shape, initial water saturation, and other factors that are seldom considered.