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Online since: September 2013
Authors: Ye Jiang Wang, Fen Lian Xu, Jing Chen
In this paper, GPS from different areas of Sichuan province was investigated; activity and impacts of fineness and content on properties of cement mortar were studied in order to provide some technical reference for GPS as pre-mixed concrete admixtures.
Although GPS having a potential activity, its activity is controlled by the chemical composition, fineness, vitrification degree and other factors [9].
Concrete: Microstructure, Properties, and Materials[M].
Influence of phosphate slag on hydration properties and pore structure of cement paste [J].
The influence of admixtures on the properties of phosphorous slag cement[J].
Online since: January 2014
Authors: Lucjan Witek
If a problem arises in the compressor section it will significantly affect the whole engine function and, of course, safety of the aircraft.
b) Effective value of stress intensity factor (Keff).
Figures 4a-4c present values of stress intensity factors KI, KII, KIII (computed for increment no. 3) in function of curvilinear S coordinate (position along crack front).
Effective stress intensity factor (Keff) presented in Fig. 4d was calculated from Yaoming equation [11]: (1) The equation (1) gives a relationship between the individual stress intensity factors and the Keff value, however we need to compute ΔKeff.
The compressor blade of PZL-10W turbo-engine (Fig. 1a) was made out of EI-961 steel (0.11C, 11Cr, 1.5Ni, 1.6 W, 0.18V, 0.35Mo, 0.025S, 0.03P) with the following properties (in 20OC) after heat treatment: Ultimate tensile strength 900-1090 MPa, Yield stress 800-900 MPa, Young modulus 200 GPa, Poisson ratio 0.3 [12].
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.
Online since: October 2021
Authors: Hossein Aghajani, Sanaz Sattarnezhad Golchin
Corrosion Resistance and Adhesion Properties of Electrophoretic Deposited Nano TiN Powder Sanaz Sattarnezhad Golchin1,a, Hossein Aghajani2,b * 1Department of Materials Engineering, University of Tabriz, Tabriz, Iran. 2School of Metallurgy and Materials Engineering, Iran University of Science and Technology, Tehran, Iran.
Thus the surface properties of these alloys may be improved by various surface modification techniques [1-3].
The key factors affecting the EPD process are particle size, zeta potential (stability) and electrical conductivity of dispersant [16-23].
Conclusions This study shows the corrosion resistance and adhesion properties of EPD process at room temperature for a possible process for preparing of uniformly and adherent TiN coating on 430 stainless steel using PEI and isopropyl alcohol
K., Bhat, A., Bose, S., and Bandyopadhyay, A., Journal of the mechanical behavior of biomedical materials, 6 (2012), 9-20
Online since: September 2018
Authors: M.X. Ribeiro, J.S. Santana, D.F. Melo, Yara Karolynne Lopes Abreu, Marcelo Barbosa Furtini, João Sammy Nery de Souza, Francisca Pereira de Araújo, Josy Antoveli Osajima, Edson Cavalcanti da Silva Filho
It is important to highlight that the low density of the panel can favor fungal attack, causing reduction, mainly in its mechanical properties [14].
Density is another important factor when determining the physical and mechanical properties which characterize different species of wood, different trees in a given species and different regions in the same tree [15].
The density is considered the most important physical property of the wood related to the species, being it a determining factor in the usage of raw material to the fabrication of panels [7,8].
Kelly: Critical literature review of relationships between processing parameters and physical properties of particleboard.
Structure, Properties, Utilization.
Online since: January 2009
Authors: Yan Shi, Dong Mei Liu, Jia Zheng Li
a mail: shiyan0817@yahoo.com.cn; b mail: lijz@mail.crsri.cn; cmail: liudongmei926@sohu.com Keywords: Fractal Theory; Cement-based materials incorporated Phosphorus slag; Mercury Intrusion Porosimetry (MIP); Pore volume fractal dimension (D); Pore structure Abstract: Based on fractal theory and MIP data of cement stone incorporated phosphorus slag, pore volume fractal dimensions (D) were calculated, and the relationship between D and several factors were explored.
In recent years,with the developing of fracture mechanics and fractal theory, scholars have found that pore structure of some porous materials has obvious fractal characteristics, and D can be used to descript microporous structure and related properties such as physical and chemistry [1]~[3].
Used furnace phosphorus slag produced by Wengfu Linfei mill, chemical composition was shown in Table 2, Table 3 were data of physical and chemical properties.
Study on composition、structure and properties of cement and concrete with steel-making slag powder mineral additive[D], China Building Materials Research Institute,6:111(2003); [7] Yu Lehua,Ou Hui, Duan Qingpu.
Fractal nature of material microstructure and size effects on apparent mechanical properties[J], Mechanics of Materials,(18):89~101(1994).
Online since: November 2016
Authors: Hong Yu Zhou, Jun Chang Ci, Cong Kun Yang, Yi Bo Chen
Based on the fatigue damage mechanism, fatigue life, stiffness degradation, crack width change, bending, shear fatigue properties and other aspects, this paper introduces the research progress of the fatigue properties of ordinary reinforced concrete beams.
With the refinement of research factors, load sequence, rate, factors of peak acceleration effect, size effect, the average load has also been included in the scope of the study and was introduced into the formula of crack propagation.
By using a large number of test data, the fatigue equations of different factors were obtained by linear fitting.
The main factors that affect the shear capacity of reinforced concrete beams are cross section form, concrete strength, reinforcement ratio, shear span ratio and fatigue stress level, stress ratio and so on.
Huang, Investigation of fatigue fracture properties of concrete, China Civil Eng.
Online since: November 2011
Authors: Hui Ping Jiang, Lin Dong, He Shun Wang
In this paper, sliding friction model under electric current was established according to the friction pair of third rail and collector shoe used in subway third rail traction system, and surface sliding contact under electric current was simulated by ANSYS, then the temperature changing property of contact zone was revealed with the coupling of friction thermal and contact resistor thermal, and the main factors that influence the temperature changing of the friction pairs were studied.
The thermal-mechanical coupling element plane13 was used for the three samples.
The properties of three materials were in Tab.1.
As for area-area friction pair, the total heat flux which sourced from mechanical friction can be calculated by the formula as follows: (2) where is energy conversion factor(defaulting as 1) in frictional heating; is equivalent friction stress; is relative sliding speed rate of the friction pair.
(2) In the process of the coupling of mechanical friction thermal and contact resistor thermal in friction and wear with electric current, the coupled temperature are distinctly affected by electric current, sliding velocity, sliding displacement under the constant normal force.
Online since: February 2012
Authors: Hao Lu, Yi Min Xia, Zhao Wang, Zhi Jin Zhou, Ze Jun Wen
Mining pipeline’s vibration can cause the pipeline leak, burst, fatigue damage, etc., which will affect the stability and reliability of pipeline systems, deteriorate working conditions and undermine system security, and even cause serious accidents and property damage [2].
For the pipeline to the lifting nodules, such as a special study of small vertical cantilever pipe vibration, it ignores the factors of the pipeline’s fluid impact, but we consider the frequency of the structure of the pipeline itself, or consider only the tube fluid and the pipe coupling.
Natural frequencies have been obtained under three conditions that stand for three coupling (internal fluid-pipe-outer fluid), two coupling and no coupling between fluid and pipe, then discuss relate difference on natural frequencies of lifting pipeline because various factors of transportation parameters and solid coupling effect result in.
At the same time, impact factor of natural frequencies in the same order also reduced, namely the greater the concentration of internal fluid of pipeline is, the more obvious difference of natural frequencies of pipeline considering effects on fluid-solid coupling and not considering coupling is; (3) impact factors in the different order are not the same, so that they can not be dealt with simply times.
[4] Han-IR Yoon,In-Soo Son,Sung-Jun Ahn.Free Vibration Analysis of Euler-Bernoulli Beam with Double Cracks [J].Journal of Mechanical Science and Technology, 2007,(21):476-485
Online since: August 2013
Authors: Mao Yan Fan, Li Fang Zhang
The key factors that affect the detector performance are described, and the basic physical and electrical parameters of ferroelectric materials that the detector needs are given.
The properties of doping BST thick-film materials satisfy the requirement of large arrays with high potential performance to be applied in pyroelectric UFPA.
The SEM of BST films on Pt/Ti/SiO2/Si substrates is shown in Fig.5,the dielectric-temperature properties under 1kHz are shown in Fig.6.
[4] Nichloas S,Anil P,Roger W.Pyroelectric properties of thin film lead scandium tantalite[J].
Electrical properties of BST thin films fabricated by a modified sol-gel process [J], Functional materials, 2006(3), 365-367
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