Sort by:
Publication Type:
Open access:
Publication Date:
Periodicals:
Search results
Online since: August 2013
Authors: Biao Zhang, Yan Qiao, Chuan Zhi Sun
And for the embedded fiber, the influences affected by elastic modulus and thickness of the fiber coating and jacket and elastic modulus of matrix material were analyzed.
For the surface bonded fiber, the influences affected by elastic modulus, width and thickness of the bonding material were analyzed, and the results were compared with the results of theory.
Optical fiber sensing technique is endowed outstanding characteristic: capacity of resisting disturbance, electrical insulation, thermostability, frost resisting, waterproof and anti-corrosion[1].These performance break through the traditional point type sensing concept and monitor structural strain information continuously which provides a powerful means for monitoring and diagnosis of construction building structure and used widely in health monitoring of engineering structures.However due to coating layer, restrictive coating and paste layer absorb a part of energy in the process of strain transfer whose accuracy rest with physical and mechanical properties of that which depends on Interface transferring properties of optical fiber strain sensor[2].
However, there was no quantitative analysis of various factors on the impact of transfer rate.
Based on the above research FEM was used to analysis Influence degree of influencing factors on transmissibility. 2.
For the surface bonded fiber, the influences affected by elastic modulus, width and thickness of the bonding material were analyzed, and the results were compared with the results of theory.
Optical fiber sensing technique is endowed outstanding characteristic: capacity of resisting disturbance, electrical insulation, thermostability, frost resisting, waterproof and anti-corrosion[1].These performance break through the traditional point type sensing concept and monitor structural strain information continuously which provides a powerful means for monitoring and diagnosis of construction building structure and used widely in health monitoring of engineering structures.However due to coating layer, restrictive coating and paste layer absorb a part of energy in the process of strain transfer whose accuracy rest with physical and mechanical properties of that which depends on Interface transferring properties of optical fiber strain sensor[2].
However, there was no quantitative analysis of various factors on the impact of transfer rate.
Based on the above research FEM was used to analysis Influence degree of influencing factors on transmissibility. 2.
Online since: July 2017
Authors: Barbara de Nicolo, Daniel Meloni
Most of existing and historical buildings in Italy are masonry structures, whose functional and architectonical requalification usually consists of new openings in masonry walls, but, according to the above mentioned principle, these modifications need to be designed at least without significantly affecting the pre-existent structural behavior.
But at the macro-scale, usually addressed for buildings design and verification, literature, National and International Codes [1, 4, 6] reduce this complexity to panels failure macro-modes, after homogenization of constituents properties.
With regard to vertical loads, instability and cracking in presence of out-of-plane eccentricities is accounted by means of tabular methods (F Factor Method) [1, 4].
Masonry elements are modeled according to a solid continuum approach, usually performed via FEM, after application of homogenization techniques when constituents properties are experimentally evaluated [5, 8], or, more frequently, using global properties experimentally tested on representative specimens.
Following this approach, several macro-elements formulations have been proposed in the literature [12] as an evolution of simple beam elements, embodying more elastic properties and non-linear behavior for pushover analyses.
But at the macro-scale, usually addressed for buildings design and verification, literature, National and International Codes [1, 4, 6] reduce this complexity to panels failure macro-modes, after homogenization of constituents properties.
With regard to vertical loads, instability and cracking in presence of out-of-plane eccentricities is accounted by means of tabular methods (F Factor Method) [1, 4].
Masonry elements are modeled according to a solid continuum approach, usually performed via FEM, after application of homogenization techniques when constituents properties are experimentally evaluated [5, 8], or, more frequently, using global properties experimentally tested on representative specimens.
Following this approach, several macro-elements formulations have been proposed in the literature [12] as an evolution of simple beam elements, embodying more elastic properties and non-linear behavior for pushover analyses.
Online since: July 2006
Authors: Dong Hui Wen, Ju Long Yuan, Bing Hai Lv, Qiao Ling Yuan
Introduction
The cutting force is one of the key physical factors in the cutting process.
It plays a critical role to predict the cutting forces under various cutting conditions and work material combination for simulation of surface error and physical properties in cutting process [1-3].
Three factors should be considered in the transfer procedure from unit cutting force to non-free cutting, that is the straight line edge transfer to main cutting edge and side-cutting edge simultaneously, including the effects of chip flow and shear area, the influence of the edge radius, the effect of major cutting edge angle rκ and minor cutting edge angle ' rκ .
Proceedings of the Institution of Mechanical Engineers, Journal of Engineering Manufacture-Part B, Vol.217 (2003) No.12, pp.1737
Hu: Proceedings of the Institution of Mechanical Engineers, journal of engineering manufacture-part B, Vol.218 (2004) No.10, pp.1267.
It plays a critical role to predict the cutting forces under various cutting conditions and work material combination for simulation of surface error and physical properties in cutting process [1-3].
Three factors should be considered in the transfer procedure from unit cutting force to non-free cutting, that is the straight line edge transfer to main cutting edge and side-cutting edge simultaneously, including the effects of chip flow and shear area, the influence of the edge radius, the effect of major cutting edge angle rκ and minor cutting edge angle ' rκ .
Proceedings of the Institution of Mechanical Engineers, Journal of Engineering Manufacture-Part B, Vol.217 (2003) No.12, pp.1737
Hu: Proceedings of the Institution of Mechanical Engineers, journal of engineering manufacture-part B, Vol.218 (2004) No.10, pp.1267.
Online since: March 2024
Authors: Abdolhossein Naghizadeh, Molusiwa C. Ramabodu, Eric A. Ohemeng
Concrete containing coarse recycled concrete aggregate (CRCA) is known to have inferior mechanical properties to concrete made with NCA.
Another mechanical property reported to be adversely affected by replacing NCA with CRCA is compressive strength.
Petrou, Enhancing mechanical and durability properties of recycled aggregate concrete, Construction and Building Materials 158 (2018) 228-235
Sun, Impact of natural and social environmental factors on building energy consumption: based on bibliometric, Journal of Building Engineering 37 (2021) 102136
Zhang, Mechanical properties of recycled aggregate concrete under uniaxial loading, Cement and Concrete Research 35(2005) 1187–1194
Another mechanical property reported to be adversely affected by replacing NCA with CRCA is compressive strength.
Petrou, Enhancing mechanical and durability properties of recycled aggregate concrete, Construction and Building Materials 158 (2018) 228-235
Sun, Impact of natural and social environmental factors on building energy consumption: based on bibliometric, Journal of Building Engineering 37 (2021) 102136
Zhang, Mechanical properties of recycled aggregate concrete under uniaxial loading, Cement and Concrete Research 35(2005) 1187–1194
Online since: March 2011
Authors: Hui Guang Bian, Chuan Sheng Wang, Rui Qin Wang, Zhen Zhen Wang, Jun Ling Zhang
Introduction
In the rubber mixing process, there are many factors affecting the efficiency and the quality of mixing rubber, among which mixing temperature is one of the most important factors which decided mixer performance, productivity and quality of mixing.Studying the internal mixer chamber temperature distribution and the changes of rubber temperature with time in the mixing process, is an important part of the mixer mixing theory, which has an important significance in studying how to avoid scorching, optimization of mixing conditions, how to improve the rotor and the cooling structure of mixer chamber , how to increase the rotor speed, how to improve quality and productivity of mixing rubber.This paper simulates the 3-D temperature field of internal mixer chamber using the finite element analysis software ---ADINA.
1 Modeling
1.1 Physical model
In this paper, the physical model of the synchronization rectangular rotor X (S) M - 1. 7Y mixer is established in working condition
(8) Where, Nu is Nusselt number,whose size reflects the strength of convective heat transfer;;Re is Reynolds number, whose size reflects the affect the fluid state on the heat transfer; Pr is Prandtl authorized number ,whose size reflects the affect material properties on heat transfer.
/ = 7. 475 <10, so this is a short heat transfer pipe, the flow in channel is not yet fully developed, inner layer of the laminar flow is very thin, and the heat resistance is weak,; the heat transfer coefficient calculated according to Formula (9) is too small and need correction, and the correction factor is 1.28.
Then: <20, therefore, it is also belong to the short-channel heat transfer, its heat transfer coefficient also need correction, correction factor is 1.13.
According to the principle of heat balance, the heat generated in the mixing process can be expressed as type (12), said: = 3600 (12) Where: is the heat generated in the mixing process, kJ / h; 3600 is the mechanical equivalent of heat, ; is the motor power, ; is the transfer efficiency, 0.6 ~ 0.7.
(8) Where, Nu is Nusselt number,whose size reflects the strength of convective heat transfer;;Re is Reynolds number, whose size reflects the affect the fluid state on the heat transfer; Pr is Prandtl authorized number ,whose size reflects the affect material properties on heat transfer.
/ = 7. 475 <10, so this is a short heat transfer pipe, the flow in channel is not yet fully developed, inner layer of the laminar flow is very thin, and the heat resistance is weak,; the heat transfer coefficient calculated according to Formula (9) is too small and need correction, and the correction factor is 1.28.
Then: <20, therefore, it is also belong to the short-channel heat transfer, its heat transfer coefficient also need correction, correction factor is 1.13.
According to the principle of heat balance, the heat generated in the mixing process can be expressed as type (12), said: = 3600 (12) Where: is the heat generated in the mixing process, kJ / h; 3600 is the mechanical equivalent of heat, ; is the motor power, ; is the transfer efficiency, 0.6 ~ 0.7.
Online since: August 2010
Authors: Shui Lin Wang, Xiu Run Ge, Qiang Zhang
So this paper
mainly studies the influence of above factors to the joint rock deformation and strength character.
Brief of RFPA 2D As the rock material is in fact non-homogeneous, the two-dimensional Rock Failure Process Analysis code (RFPA 2D ) assumes that the rock mass is composed of many mesoelement whose material properties are specified according to the Weibull distribution.
Calculation models and mechanical parameters.
The analysis provides theoretical basis to evaluate the joint rock strength properties and engineering stability based on geological sketch data, such as joint rose diagram.
Goodman, "The mechanical property of joints", In Proc. 3rd Cong ISRM, Denver, Part A, 1974, p. 127-140
Brief of RFPA 2D As the rock material is in fact non-homogeneous, the two-dimensional Rock Failure Process Analysis code (RFPA 2D ) assumes that the rock mass is composed of many mesoelement whose material properties are specified according to the Weibull distribution.
Calculation models and mechanical parameters.
The analysis provides theoretical basis to evaluate the joint rock strength properties and engineering stability based on geological sketch data, such as joint rose diagram.
Goodman, "The mechanical property of joints", In Proc. 3rd Cong ISRM, Denver, Part A, 1974, p. 127-140
Online since: June 2012
Authors: Jing Li, Jia Liu, Jun Yi Huo, Li Na Liu
Whether can properly evaluate the slope stability is directly related to the country's construction and people's lives and property [1].
The key to the slope stability analysis is to determine the most dangerous sliding surface of slope and its corresponding minimum safety factor.
The disadvantages affect the quality and efficiency of its search.
Table 3 The mechanical parameters of the soils Layer number 1 19.9 28.0 18.0 2 20.0 25.0 22.0 We run the algorithm SAA_IAFSA, AFSA, GA to find the safety factor of the slope.
Summary In this paper, a new algorithm SAA_IAFSA is proposed to search the most dangerous sliding surface of slope and its corresponding minimum safety factor.
The key to the slope stability analysis is to determine the most dangerous sliding surface of slope and its corresponding minimum safety factor.
The disadvantages affect the quality and efficiency of its search.
Table 3 The mechanical parameters of the soils Layer number 1 19.9 28.0 18.0 2 20.0 25.0 22.0 We run the algorithm SAA_IAFSA, AFSA, GA to find the safety factor of the slope.
Summary In this paper, a new algorithm SAA_IAFSA is proposed to search the most dangerous sliding surface of slope and its corresponding minimum safety factor.
Online since: March 2010
Authors: Se Hyun Ko, Gue Serb Cho, Seong Ho Son, Jun Ki Kim, Chang Woo Lee, Won Sik Lee
Physical properties such as Poisson's ratio
could be changed in very thin metallic film, and
especially, damping property of material is not
considered as a simulation parameter though an
important factor to amplitude.
In type C diaphragm with relatively larger etched space, the amplitude is not affected almost by sound pressure level, whereas the amplitudes in type A and B diaphragms increase with increase of sound pressure level, indicating that area of diaphragm influences directly the amplitude.
These seem to be mainly from the inaccurate input parameters and missing some properties such as damping property of Ni electroplated thin film.
Amplitude of diaphragm was affected directly by the area of diaphragm and increased with increase of sound pressure level.
Pister: Proc. of the ASME International Mechanical Engineering Congress and Expo, (2002)
In type C diaphragm with relatively larger etched space, the amplitude is not affected almost by sound pressure level, whereas the amplitudes in type A and B diaphragms increase with increase of sound pressure level, indicating that area of diaphragm influences directly the amplitude.
These seem to be mainly from the inaccurate input parameters and missing some properties such as damping property of Ni electroplated thin film.
Amplitude of diaphragm was affected directly by the area of diaphragm and increased with increase of sound pressure level.
Pister: Proc. of the ASME International Mechanical Engineering Congress and Expo, (2002)
Online since: July 2011
Authors: Bo Peng, Shou Xiao Fan, De Zhi Zheng, Li Qin Wang, Le Gu
Introduction
In aerospace, with such working conditions as high speed, heavy load, high temperature, cryogenic environment and alternating temperature, surface failure of the tribo-part is one of the most important factors that affect the reliability of the whole work system.
Mechanical structure and lubricating system.
Fig.1(a) shows mechanical structure of the test rig, Fig.1(b) shows the mounting arrangement of the tested pieces.
Fig.3 Scheme diagram of software Several experimental results of the elliptical point contact Tribological properties of the material in room temperature.
It indicates that compared with the contact stress, the increase of sliding speed is the prior factor of surface damage generation.
Mechanical structure and lubricating system.
Fig.1(a) shows mechanical structure of the test rig, Fig.1(b) shows the mounting arrangement of the tested pieces.
Fig.3 Scheme diagram of software Several experimental results of the elliptical point contact Tribological properties of the material in room temperature.
It indicates that compared with the contact stress, the increase of sliding speed is the prior factor of surface damage generation.
Online since: September 2017
Authors: Ružica R. Nikolić, Radica Prokić-Cvetković, Olivera Popović, Vukić Lazić, Dušan Arsić, Dejan Djordjević
The Base Metal and its Weldability
Chemical and mechanical properties.
The Oxelösund steel plant provides the data on the Hardox 450 steel chemical composition and mechanical properties given in Tables 1 and 2, respectively [2, 10].
Appearance of the unfavorable Widmanstetten structure in the HAZ is undesirable since it causes reducing of the mechanical properties, primarily the toughness.
In this way the more favorable mechanical properties of the welded joint individual zones are obtained.
Bokůvka, Structure and mechanical properties of fine-grained steels, Periodica Polytechnica Transportation Engineering 41(2) (2013) 111-115
The Oxelösund steel plant provides the data on the Hardox 450 steel chemical composition and mechanical properties given in Tables 1 and 2, respectively [2, 10].
Appearance of the unfavorable Widmanstetten structure in the HAZ is undesirable since it causes reducing of the mechanical properties, primarily the toughness.
In this way the more favorable mechanical properties of the welded joint individual zones are obtained.
Bokůvka, Structure and mechanical properties of fine-grained steels, Periodica Polytechnica Transportation Engineering 41(2) (2013) 111-115