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Online since: December 2014
Authors: Yi Sheng Zhang, Zi Jian Wang, Ya Xu, Yi Lin Wang, Ming Lin Zhou
The compatibility of mechanical properties and safety performance of vehicle parts such as b-pillar has been proposed that different mechanical properties are needed in different regions of the same parts, namely tailored properties.
Then, different mechanical properties can be achieved in different zones throughout the specimen.
Hence the blank of the transition region reached its lowest cooling rate considering the two factors, resulting the lowest hardness.
When the die temperature was set at 400˚C, the hardness with 20MPa holding pressure was higher than others, which resulted by considering the two factors.
Hot forming of boron steels using heated and cooled tooling for tailored properties.
Then, different mechanical properties can be achieved in different zones throughout the specimen.
Hence the blank of the transition region reached its lowest cooling rate considering the two factors, resulting the lowest hardness.
When the die temperature was set at 400˚C, the hardness with 20MPa holding pressure was higher than others, which resulted by considering the two factors.
Hot forming of boron steels using heated and cooled tooling for tailored properties.
Online since: February 2012
Authors: Y.X. Zhang, B.L. Wang
The stress intensity factors as the function of crack length, time and relative density are calculated.
For cellular ceramic solids, the mechanical properties depend on physical prosperities, chemical properties and porosity etc.
(a) Non-demensional transient thermal stress intensity factors, (b) peak values of the thermal stress intensity factor ().
Vol. 29 (1994), p. 486 [3] M.F.Ashby: The Mechanical Properties of Cellular Solids, Metall.
Ashby: Cellular Solids, Structure and Properties (Pergamon Press, Oxford, U.K. 1988)
For cellular ceramic solids, the mechanical properties depend on physical prosperities, chemical properties and porosity etc.
(a) Non-demensional transient thermal stress intensity factors, (b) peak values of the thermal stress intensity factor ().
Vol. 29 (1994), p. 486 [3] M.F.Ashby: The Mechanical Properties of Cellular Solids, Metall.
Ashby: Cellular Solids, Structure and Properties (Pergamon Press, Oxford, U.K. 1988)
Online since: October 2014
Authors: Gui Fang Fang, Peng Gao Zhang, Long Wei
Fluid film thickness affects directly the leakage rate and wear, and is an important parameter for determining the friction heat generated between two end faces.
Fluid film average pressure between the end faces of mechanical seal not only is related to the property of sealant, structure of seal, and working parameters, but also friction state between the end faces.
Asperity contact friction factor fc = 0.1[8,9] and rotating speed n=2900 r×min-1 are took for theoretical calculation.
(3) Mechanical seal contact faces average film thickness model established by fractal theory provides a foundation for studying friction, wear and leakage property, and has important significances on predicating working property between end faces during actual operating and design of the end faces for mechanical seal.
(In Chinese) [8] G.F.Fang, P.G.Zhang, L.Wei, Effect of surface topography on contact property of the end face for mechanical seal, Applied Mechanics and Materials. 419 (2013) 292-298
Fluid film average pressure between the end faces of mechanical seal not only is related to the property of sealant, structure of seal, and working parameters, but also friction state between the end faces.
Asperity contact friction factor fc = 0.1[8,9] and rotating speed n=2900 r×min-1 are took for theoretical calculation.
(3) Mechanical seal contact faces average film thickness model established by fractal theory provides a foundation for studying friction, wear and leakage property, and has important significances on predicating working property between end faces during actual operating and design of the end faces for mechanical seal.
(In Chinese) [8] G.F.Fang, P.G.Zhang, L.Wei, Effect of surface topography on contact property of the end face for mechanical seal, Applied Mechanics and Materials. 419 (2013) 292-298
Online since: November 2013
Authors: Mohamad Rusop Mahmood, Suriani Abu Bakar, A.I.H. Habibah Dayang, Azira Abd. Aziz
According to the present study, application of the physical and mechanical properties of carbon nanotubes to NR can result in rubber products which have improved mechanical, physical and chemical properties.
In this work, morphology and mechanical properties of ENR/MWCNT nanocomposites were investigated.
Results and discussion The state of dispersion, which significantly affects the electrical and mechanical properties of the material, can be evidenced by FESEM and AFM analysis of the composites.
Another factor considered important on the mechanical properties is the aspect ratio; if the aspect ratio is high the strength of the material will increase.
Because the resistivity is very sensitive to any change in filler distribution, electrical properties of composite filled with conductive particles should be affected by a mechanical deformation.
In this work, morphology and mechanical properties of ENR/MWCNT nanocomposites were investigated.
Results and discussion The state of dispersion, which significantly affects the electrical and mechanical properties of the material, can be evidenced by FESEM and AFM analysis of the composites.
Another factor considered important on the mechanical properties is the aspect ratio; if the aspect ratio is high the strength of the material will increase.
Because the resistivity is very sensitive to any change in filler distribution, electrical properties of composite filled with conductive particles should be affected by a mechanical deformation.
Online since: May 2004
Authors: Ahmet Tuncan, Mustafa Tuncan, M. Yalçın, Bekir Karasu
The Effects of Filler Glasses on Mechanical Properties of Concrete
M.
The factor affecting physical and mechanical properties and chemical endurance of concrete is the amount of structural pores, which form within its structure.
Therefore, employing glasses as an additive in concrete can improve the final mechanical properties.
Improvement in concrete strength has generally meant the better mechanical properties of concrete.
The physical properties and mix proportion are given in Table 1.
The factor affecting physical and mechanical properties and chemical endurance of concrete is the amount of structural pores, which form within its structure.
Therefore, employing glasses as an additive in concrete can improve the final mechanical properties.
Improvement in concrete strength has generally meant the better mechanical properties of concrete.
The physical properties and mix proportion are given in Table 1.
Online since: July 2015
Authors: Md Abdul Maleque, Muhammad Hasibul Hasan, Yeakub Ali Mohammad, M.H.A. Musa
The goal is to achieve superior mechanical properties by producing a fine and uniform acicular ferrite microstructure, rather than having a conventional ferrite/pearlite type microstructure.
Once the toughness level is reached, the critical defect size is controlled by the material strength properties and is no longer affected by toughness [10].
Amano et al. [12] have studied the metallurgical welding factors and co-related to local brittle zone formation.
Imai, "General properties of tmcp steels."
Nakano, Metallurgical and welding factors controlling local brittle zone in weld HAZ, Proceedings of the International Offshore Mechanics and Arctic Engineering Symposium, 1989, Vol. 3, pp. 683
Once the toughness level is reached, the critical defect size is controlled by the material strength properties and is no longer affected by toughness [10].
Amano et al. [12] have studied the metallurgical welding factors and co-related to local brittle zone formation.
Imai, "General properties of tmcp steels."
Nakano, Metallurgical and welding factors controlling local brittle zone in weld HAZ, Proceedings of the International Offshore Mechanics and Arctic Engineering Symposium, 1989, Vol. 3, pp. 683
Online since: May 2011
Authors: Wei Min Wang
Analysis on Mechanical Properties of Tunnel Lining on Fire
Weimin Wang
Shanghai University, Fire Corps of Ningxia Autonomous Region,China
wangwm119@126.com
Key words: Tunnel; Lining; Fire; Hyperthermia; Mechanical Property
Abstract: The paper analyzes the fire-resistant performance of big tunnel structure by setting up the analyzing model of tunnel-surrounding, choosing the characteristics of concrete, according to the lengthways and crosswise temperature distribution in specific scene of fire, analyzing the temperature and stress field of the tunnel structure, and knowing the basic rules and the damage of the lining and inner equipment of the tunnel by high temperature which is set on the Shanghai Yangtze tunnel.
Concrete is a kind of non-homogeneous composite material, which would experience complex changing both physically and chemically by the high temperature, and the changing will surely lead to the descent of the carrying capability of the integral mechanical properties.
Fig.1 Double Line Tunnel and Fig. 2 Finite Element of Double Line Contact Gallery Model Tunnel structure Model Material characteristics The basic performance of material can be divided into thermal property and mechanical property.
The main thermo technical parameter and the mechanical property parameter in high temperature refers Guo zhen hai’s and Lu zhou dao’s vend data, and the European standard as well.
Under the impact of such inclement factors, the fire-resistant time should be at least twenty or more than thirty minutes in order to ensure the normal mechanical property of the tunnel structure.
Concrete is a kind of non-homogeneous composite material, which would experience complex changing both physically and chemically by the high temperature, and the changing will surely lead to the descent of the carrying capability of the integral mechanical properties.
Fig.1 Double Line Tunnel and Fig. 2 Finite Element of Double Line Contact Gallery Model Tunnel structure Model Material characteristics The basic performance of material can be divided into thermal property and mechanical property.
The main thermo technical parameter and the mechanical property parameter in high temperature refers Guo zhen hai’s and Lu zhou dao’s vend data, and the European standard as well.
Under the impact of such inclement factors, the fire-resistant time should be at least twenty or more than thirty minutes in order to ensure the normal mechanical property of the tunnel structure.
Online since: September 2014
Authors: Wei Zhen Chen, Jian Xi Yang
The tensile capacity of corroded stayed cables are affected by main factors such as cable specifications, mechanical properties of wires, extent of corrosion, and distribution of corroded wires in stayed cables.
The last two factors are especially in need of systematic research.
Therefore, this paper, taking advantage of the project of displacing stayed cables of Shimen Bridge, attempts an investigation of the two factors from the following perspectives: The investigation starts with measurement of corroded cable wires of the bridge to understand mechanical property of the wires and then makes an empirical fitting curve according to the mechanical change caused by corrosion.
Fig. 1 Shimen Bridge Fig. 2 Grade division of wire corrosion Corrosion Effect On The Mechanical Properties Of Wires As mechanism of wire corrosion is complex and factors related to corrosion is high in randomness, relevant research so far made cannot accurately describe mechanical behaviors of wires with corrosion.
According to the above investigation, it was presumed that corrosion extent of various cable wires is decided by two factors: the corrosion extent of wire beneath the breakage of sheath and the distance from the sheath breakage.
The last two factors are especially in need of systematic research.
Therefore, this paper, taking advantage of the project of displacing stayed cables of Shimen Bridge, attempts an investigation of the two factors from the following perspectives: The investigation starts with measurement of corroded cable wires of the bridge to understand mechanical property of the wires and then makes an empirical fitting curve according to the mechanical change caused by corrosion.
Fig. 1 Shimen Bridge Fig. 2 Grade division of wire corrosion Corrosion Effect On The Mechanical Properties Of Wires As mechanism of wire corrosion is complex and factors related to corrosion is high in randomness, relevant research so far made cannot accurately describe mechanical behaviors of wires with corrosion.
According to the above investigation, it was presumed that corrosion extent of various cable wires is decided by two factors: the corrosion extent of wire beneath the breakage of sheath and the distance from the sheath breakage.
Online since: April 2018
Authors: Anocha Munpakdee, Manlika Kamnoy, Sukum Eitssayeam, Tawee Tunkasiri, Uraiwan Intatha
Moreover, the mechanical properties was investigated by Vickers hardness testing.
Table 1 The mechanical properties of the lithium disilicate glass-ceramic specimens.
It was found that the heat treatment temperature affects the on mechanical properties in the lithium disilicate glass-ceramic.
Besides the mechanical property, the translucent property of the lithium disilicate glass-ceramics is another important property which needs to be concerned because the translucent is one of the factors affecting the esthetics, adding the confidence to the patients and is also critical for fabrication of dental.
Thiel, Mechanical properties of polymer-infiltrated-ceramic-network materials, Dent.
Table 1 The mechanical properties of the lithium disilicate glass-ceramic specimens.
It was found that the heat treatment temperature affects the on mechanical properties in the lithium disilicate glass-ceramic.
Besides the mechanical property, the translucent property of the lithium disilicate glass-ceramics is another important property which needs to be concerned because the translucent is one of the factors affecting the esthetics, adding the confidence to the patients and is also critical for fabrication of dental.
Thiel, Mechanical properties of polymer-infiltrated-ceramic-network materials, Dent.
Online since: May 2020
Authors: Xi Hao Liu, Bin Han, Jia Yi Lin, Hui Wang
The properties of the cladding layer depend on the process parameters and the properties of the powder material.
It not only affects the microstructure of the cladding layer, but also has a certain degree of effect on hardness and wear properties.
Effect of Process Parameters Work Together on the Morphology and Properties of Cladding Layer The above scholars considered the influence of parameters on the properties of the cladding layer from a single factor, but in most cases the performance of laser cladding is the result of multiple factors.
The heat input has a great influence on the phase transition in the molten pool, and affects the microstructure of the cladding layer by affecting the particle size and distribution of the reinforcing phase.
Therefore, various factors need to be controlled.
It not only affects the microstructure of the cladding layer, but also has a certain degree of effect on hardness and wear properties.
Effect of Process Parameters Work Together on the Morphology and Properties of Cladding Layer The above scholars considered the influence of parameters on the properties of the cladding layer from a single factor, but in most cases the performance of laser cladding is the result of multiple factors.
The heat input has a great influence on the phase transition in the molten pool, and affects the microstructure of the cladding layer by affecting the particle size and distribution of the reinforcing phase.
Therefore, various factors need to be controlled.