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Online since: July 2012
Authors: Xiao Xue Liao, Yan Fang Zhao, Shuang Quan Liao, Ming Chao Luo
When modified WRP is added into rubber matrix, the mechanical properties of composite and compatibility between virgin rubber and WRP are improved.
On the one hand, B whose the lowest crosslinking results in the best flexibility is good for dynamic mechanical properties.
On the other hand, the existence of B impairs physical and mechanical properties of virgin rubber/WRP compound.
So the direct use of WRP is limited by the negative effects on mechanical properties of compounds.
Unfortunately, this method usually cuts off the main rubber chains, which impairs mechanical properties of vulcanizates.
On the one hand, B whose the lowest crosslinking results in the best flexibility is good for dynamic mechanical properties.
On the other hand, the existence of B impairs physical and mechanical properties of virgin rubber/WRP compound.
So the direct use of WRP is limited by the negative effects on mechanical properties of compounds.
Unfortunately, this method usually cuts off the main rubber chains, which impairs mechanical properties of vulcanizates.
Online since: November 2011
Authors: Hong Yu Wei, Zhong Ning Guo
Ordered micro-structured surface will make the material characteristics such as optical properties, adhesion, lubricity, wear resistance and other properties change.
But with the development of research, people found the surface with microstructure has better friction properties than the smooth one, and gain the new pathways to reduce friction through texture microstructure ( as shown in Figure 1 ).
At present, people have constructed non smooth microstructure in the kinematic pair work surface to improve their wear resistance and fatigue resistance properties.
In many cases, vibration and noise are considered negative factors, if the vibration exceeds allowable limits, it will have a larger dynamic load and noise, and will affect the performance and service life.
Microstructured optical components have microstructured surfaces, which determines the light reflection, transmission and diffraction properties.
But with the development of research, people found the surface with microstructure has better friction properties than the smooth one, and gain the new pathways to reduce friction through texture microstructure ( as shown in Figure 1 ).
At present, people have constructed non smooth microstructure in the kinematic pair work surface to improve their wear resistance and fatigue resistance properties.
In many cases, vibration and noise are considered negative factors, if the vibration exceeds allowable limits, it will have a larger dynamic load and noise, and will affect the performance and service life.
Microstructured optical components have microstructured surfaces, which determines the light reflection, transmission and diffraction properties.
Online since: October 2011
Authors: R. Balasubramanian, Moaz H. Ali, Bashir Mohamed, Basim A. Khidhir
While tool damage cannot be avoided, it can often be reduced if its failure mechanism and the factors controlling it are properly understood [4].
It has also been shown that HPC results in better surface integrity and lower compressive residual stress, which improves the properties of the machined work-piece [15].
In general, elements that affect chip shape include work-piece material properties, machining parameters and tool geometry [29].
But based on above analysis, nitrogen gas is another factor that affects chip shape of titanium alloys.
He found that there is a big difference and marked clearly on each of these properties before cooling and after.
It has also been shown that HPC results in better surface integrity and lower compressive residual stress, which improves the properties of the machined work-piece [15].
In general, elements that affect chip shape include work-piece material properties, machining parameters and tool geometry [29].
But based on above analysis, nitrogen gas is another factor that affects chip shape of titanium alloys.
He found that there is a big difference and marked clearly on each of these properties before cooling and after.
Online since: April 2016
Authors: Y. Şahin, Senai Yalcinkaya
Control factors and their levels.
Effects of control factors of the steels are shown in Fig. 1 for means SNR, respectively.
The strongest influence on the surface roughness was exerted by factor A, followed by factors B and C.
It is observed from the Table 5 that factors A had statistical and physical significance on the surface roughness because test-F value was higher than F5 % column value, followed by the factor B, and the factor C was found.
ANOVA table for SNR indicated that the cutting-fluid (p=0.020), the depth of cut (p=0.054) and the feed rate (p=0.47) in this order, were the control factors affecting the surface finish of the component.
Effects of control factors of the steels are shown in Fig. 1 for means SNR, respectively.
The strongest influence on the surface roughness was exerted by factor A, followed by factors B and C.
It is observed from the Table 5 that factors A had statistical and physical significance on the surface roughness because test-F value was higher than F5 % column value, followed by the factor B, and the factor C was found.
ANOVA table for SNR indicated that the cutting-fluid (p=0.020), the depth of cut (p=0.054) and the feed rate (p=0.47) in this order, were the control factors affecting the surface finish of the component.
Online since: November 2011
Authors: Shu Min Li, Xiang Bi An, Zong Po Ma, Jun Zhong Xia
The standardization processes of these research factors are developed and the typified examples are ISO2631 and BS6841 [1,2].
These systems are composed of springs and dampers with fixed properties.
By adopting the formulation of the control system, both road holding capability and comfort are affected.
References [1] Mechanical vibration and shock – Evaluation of human exposure to whole-body vibration, Part 1:General requirements, ISO 2631-1, 2nd ed.
[2] British Standard Guide to measurement and evaluation of human exposure to whole body mechanical vibration and repeated shock, BS 6841.
These systems are composed of springs and dampers with fixed properties.
By adopting the formulation of the control system, both road holding capability and comfort are affected.
References [1] Mechanical vibration and shock – Evaluation of human exposure to whole-body vibration, Part 1:General requirements, ISO 2631-1, 2nd ed.
[2] British Standard Guide to measurement and evaluation of human exposure to whole body mechanical vibration and repeated shock, BS 6841.
Online since: February 2011
Authors: Yan Feng Feng, Qing Li, Qing Lei Yu, Zhe Zhang
The disturbed zone around an excavation is a region where the original state of the in situ rock mass, such as stress, strain, rock stability, water flow, etc. has been affected.
The displacement and stresses are the factors controlling the roadway stability.
In this article, major test results and conceptual behavior of rock joints during mechanical tests are reviewed with constitutive models.
Materials mechanics properties parameters (such as Young’s modulus, compressive strength)were given in table 1.
Material mechanical properties Results and Discussion In order to study the effect of lateral pressure coefficient in solid material, several numerical models with different sample were established and solid material modeling was conducted.
The displacement and stresses are the factors controlling the roadway stability.
In this article, major test results and conceptual behavior of rock joints during mechanical tests are reviewed with constitutive models.
Materials mechanics properties parameters (such as Young’s modulus, compressive strength)were given in table 1.
Material mechanical properties Results and Discussion In order to study the effect of lateral pressure coefficient in solid material, several numerical models with different sample were established and solid material modeling was conducted.
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: May 2016
Authors: Petr Štěpánek, František Girgle, Vojtěch Kostiha, Anna Kučerová
Introduction
Generally, structures are exposed to a number of factors that negatively influence their reliability (material degradation due to environmental influences, changes in the load intensity, accidental actions - for example a vehicle impact, etc.) during lifetime.
FRP confinement induces the triaxial state of stress [1], [7], which leads to increase of the mechanical properties of the concrete as a base material.
Fig. 2 Principle of strengthening by confinement – lateral stress Factors influencing effect of confinement.
Initial relations were derived mainly for cross-sections reinforced resp. strengthened with steel reinforcement, but they are generally valid if different mechanical properties of strengthening materials are taken into account.
Together with the test specimens, concrete beams and cubes were manufactured in order to determine required properties of concrete - concrete compressive strength and modulus of elasticity.
FRP confinement induces the triaxial state of stress [1], [7], which leads to increase of the mechanical properties of the concrete as a base material.
Fig. 2 Principle of strengthening by confinement – lateral stress Factors influencing effect of confinement.
Initial relations were derived mainly for cross-sections reinforced resp. strengthened with steel reinforcement, but they are generally valid if different mechanical properties of strengthening materials are taken into account.
Together with the test specimens, concrete beams and cubes were manufactured in order to determine required properties of concrete - concrete compressive strength and modulus of elasticity.
Online since: May 2017
Authors: Petr Daněk, Libor Topolář, Michaela Potočková, Petr Misák, Bronislava Moravcová, Dalibor Kocáb
Introduction
The study of concrete properties currently emphasises not only strength, e.g. compressive, but also
elastic properties, such as the static modulus of elasticity [1], [2] .
This property of hardened concrete affects primarily its deformation under load, the magnitude of deformation or shrinkage.
In order to eliminate the factor of concrete aging during the experiment, the concrete was tested at an age of more than 1 year.
Table shows the properties of the concretes in the fresh and hardened state.
Neville, Properties of concrete, 5th ed., Pearson, New York, 2011
This property of hardened concrete affects primarily its deformation under load, the magnitude of deformation or shrinkage.
In order to eliminate the factor of concrete aging during the experiment, the concrete was tested at an age of more than 1 year.
Table shows the properties of the concretes in the fresh and hardened state.
Neville, Properties of concrete, 5th ed., Pearson, New York, 2011
Online since: October 2014
Authors: Olga Troynikov, Siti Hana Nasir
In this research, the elastic properties of three commercial fabrics commonly used for producing therapeutic compression gloves were investigated.
The amount of pressure generated by compression gloves are influence by the following factors: construction and fit of the glove; structure and physical properties of its materials; size and shape of the hand; and the nature of the hand activity undertaken [11].
These ranges of extension were determined based on the reduction factors which are commonly used for making compression gloves.
Marteau, Factors influencing the effectiveness of compression garments used in sports.
Yıldız, A novel technique to determine pressure in pressure garments for hypertrophic burn scars and comfort properties.
The amount of pressure generated by compression gloves are influence by the following factors: construction and fit of the glove; structure and physical properties of its materials; size and shape of the hand; and the nature of the hand activity undertaken [11].
These ranges of extension were determined based on the reduction factors which are commonly used for making compression gloves.
Marteau, Factors influencing the effectiveness of compression garments used in sports.
Yıldız, A novel technique to determine pressure in pressure garments for hypertrophic burn scars and comfort properties.