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Online since: March 2011
Authors: Li Li, Chuan Sheng Wang, Yun Wang
From the force analysis about the blends, there are three structure factors about rotor effecting the mixing process, such as the wedge angle θ of the rotor’s cross-section, the helix angle β of the rotor’s wing and the length of the wings.
When is too small, the shearing effect will be weak; on the other hand, the large macromolecular chains of rubbers and plastics will be broken, the physical and mechanical properties of the vulcanizate would be decreased.
From the above analysis of the forces, there are three factors influencing the mixing performance considered the configuration of the rotor. 3.
The effect of the rotor’s helix angle ß for the mixing From the above force analysis , the helix angle ß should affect the axial force only.
In this article, on the base of the force analysis for the compounds in the mixer chamber, there are three structure factors about rotor effecting the mixing process, such as the wedge angle θ of the rotor’s cross-section, the helix angle β of the rotor’s wing and the length of the wings.
Online since: December 2019
Authors: Viktoriya Viktorovna Nelubova
The Composition and Properties of Autoclaved Gas Concrete with Amorphized Raw Modifiers V.V.
The article presents the research devoted to the effect of mineral modifiers obtained by mechanical activation of amorphized raw materials in water environment with obtaining a stable suspension on the gas concrete properties of autoclaved hardening.
The studies of the physic and mechanical properties of the finished gas concrete (strength, density, thermal conductivity) were carried out according to the requirements of National State Standard № 3135972007 “Cellular concrete of autoclaved hardening.
Kozhukhova, Analysis of the factors of increasing the strength of the non-autoclave aerated concrete, Construction Materials and Products. 1 (1) (2018) 59–68
Nelubova, Autoclave foam concrete: Structure and properties, AIP Conference Proceedings. (2016), 1698
Online since: May 2014
Authors: Jian Jun Chen, Hong Liang Pan, Xiao Xue Li
Introduction With the rapid development of the energy-saving related industry in recent years, strip steel has been in great demand for its excellent mechanical and electromagnetic characters.
The breakage of strip steel during cold rolling process is a kind of fracture of material in large deformation, which depends on macroscopic factors such as roll geometry, rolling speed, reduction ratio or pass schedule, lubrication or friction, alloy and temper, and mechanical properties as well as on microscopic factors such as microstructure and surface micro-topography.
Among the various defects in the strip steel, the edge crack is one of the most common surface flaws affecting the strip quality and would lead to the fracture of the strip steel[1].
Because the stress and strain fields in the strip steel are affected by many influencing factors, a large number of finite element models have been developed to analyze the rolling problem due to their ability in accurately predicting the details of process variables.
The value of the J-integral which is coupling the dynamic factors is calculated and its path-independent feature is analyzed.
Online since: December 2012
Authors: Hong Gao, Wu Gao, Chun Xiao Li, Xiao Xia Huo
Measured defects affect the steel scaffolding structure, leading to serious security risks.
to become the main effect of initial imperfection factors.
Calculations can be found in the rod geometry, material properties of the structure will have an impact, relative to the ideal structure, the ultimate bearing capacity have reduced about 10%.Therefore, the tube material itself defect structure is influential, material defects in the structure analysis to be appropriate to consider.
The article systematically studied nonlinear mechanical properties of steel tubular scaffold with initial imperfections and defects on the ultimate bearing capacity of research, based on nonlinear finite element theory, the theoretical analysis and numerical calculation, It has some theoretical and practical significance, the main conclusions are as follows: 1)The use of stochastic finite element method, the ultimate bearing capacity of the different conditions of tightening torque calculation and found that the geometry of the rod, and material properties on the structure will have an impact,Relative to the ideal structure, the ultimate bearing capacity lower than the obvious, reducing about 10%. . 2)Analysis of the defects of the fastener scaffold structure, consistent contrast defect method and the random-defect method two analysis methods, to draw a consistent defect method to defects in the value of taking 3L/1000 unsafe.
It described the pole bending defects affect the structural capacity of the main defects.
Online since: December 2014
Authors: Xing Hua Xie, Kang Xu, Hui Sheng Zhou
Then the factors of hot spots generated in the production of emulsion explosives and the occurred conditions of the heat accumulation are analyzed and summarized.
Factors affecting the accumulation of explosive system has a lot of heat, is now on the incorporation of impurities within the emulsifier emulsion explosives emulsion process, analyze aspects of mechanical rotation and thermal conditions and their own sense of emulsion explosives and so on.
Summary Through the above analysis, the emulsion is formed hot spots factors may include: explosives mixed with chemical catalytic material systems and air; system mixed with impurities; intense shear colloid emulsion, mechanical kinetic energy is converted into heat; intense friction hard substance, ammonium nitrate crystallization.
In summary, during the production of emulsion explosives explosion must meet with generation of hot spots and heat accumulation in the process, however, many factors affect this process are manifold.
Strictly controlled to produce a variety of hot and heat build-up factors, the most important measure is to avoid the explosion occurred in the emulsion matrix emulsifier.
Online since: November 2015
Authors: Stanisław Legutko, Krzysztof Adamczuk, W. Radoslaw Maruda, Grzegorz Królczyk
On the basis of the research, the improvement of mechanical and tribological properties for friction pairs with addition of those elements was proven.
The adopted parameters for the studies of tribological properties were set based on numerous tests performed at the Faculty of Mechanical Engineering of the University of Zielona Gora.
Modifying the lubricant resulted in the improvement of its anti-wear properties. 4.
Unlu, Investigation of tribological and mechanical properties of metal bearings.
Atik, Evaluation of effect of alloy elements in copper based CuSn10 and CuZn30 bearings on tribological and mechanical properties.
Online since: December 2013
Authors: Ke Sheng Jin, Ying Huang, Xiao Na Chen
Environmental condition variance in to soil mass behaviour ' s influence also more and more of came in for occupation natural attention , Fang xiao yang[1] thought nowaday geotechnical engineering theory and method primarily gist mechanical energy determinate, mechanical energy to geotechnical engineering behaviour play a central role , yet in the process of time, earthy property no longer except by mechanical energy ground control , environmental energy ground factor like wetting and drying cycle grade would change soil grain property, thereby change earthy engineering properties , just this kind of influence affect take on a long term.
The laterite resource that is widely distributed in Yunnan,seriously threaten to the safety of laterite structure and ecological environment and sustainable development Because by the various forms of pollution.In engineering, contaminated by acid clay, soil strength significantly reduced, leading to instability or destruction of superstructures, triggering a series of engineering accidents.Therefore, research is contaminated with acid laterite contamination mechanism to stabilize the construction quality traits, protecting the environment is important, but also for taking reasonable and proper remediation measures provide theoretical support. 1 Experimental program 1.1 Pollution and soil samples In this experiment, Kunming Huangtupo smelter basalt laterite has been as the research object, the election HCl as a source of contamination.Press the "Specification of soil test" measured physical properties indicators of basalt laterite in Table 1: Table1 The index of physical properties
Tab 4 The compressibility coefficient of acid pollution laterite Unit: MPa-1 Curing time/d concentration of hydrochloric acid/% 0 1 3 7 8 0 0.174 0.361 0.329 0.313 0.352 1 0.173 0.399 0.359 0.371 0.404 4 0.175 0.226 0.215 0.261 0.278 7 0.172 0.269 0.234 0.291 0.395 14 0.175 0.340 0.340 0.380 0.550 30 0.172 0.361 0.329 0.313 0.352 As can be seen from Table 4, pollution soil samples in the case of the same curing time, compared with plain laterite, acid laterite contamination after the compression factor with the increasing concentration of acid added first increases, then has been reduced, and finally increased variation.
Hydrochloric acid is added in the same proportion as the case of acid pollution on laterite after compression factor must be greater than the plain clay compression factor, and with the specimen curing time, the acid pollution laterite compression factor also increases first, then there the decreased, and finally the variation of increase. 2.3 Mechanism Analysis of hydrochloric acid contaminated laterite After adding hydrochloric acid into laterite, hydrochloric acid affect laterite particles and the corrosive between particles of the coupling , corrosion process can be divided into corrosion stages, a salt phase and the dissolution phase.corrosion stage is the process that the laterite oxide dissociate into cations when initial hydrochloric acid was added to ; chloride salt phase represents reaction of chloride ion with the cationic salt in the process; dissolution stage is the soluble salt formed in the process of gradually dissolved.
(2)The compression factor of Acid contaminated laterite is to be greater than prime laterite, and with the increase of acid concentration and curing time, the acid pollution laterite compression factor both showed increases first and then been reduced, and finally increases the variation
Online since: September 2014
Authors: Serena Cattari, Sergio Lagomarsino, Daria Ottonelli
The role played by boundary conditions in affecting the seismic response of the main body is particularly relevant.
Starting from the computation of the maximum spectral acceleration (a*max from Eq. 11, assumed to correspond to DL2 as illustrated in Fig.2) and that of the elastic period T1, thus, through the relationship that join a* and d* (d*=a*T2/4p2) and the introduction of proper corrective factors, all the other entities that describe the capacity curve and the different DLs may be computed.
The mechanical properties of masonry with solid brick and lime mortar derive from the reference values of the Italian Code for Structural Design [12].
In the FEM model also the presence of the adjacent church has been included that in the examined case significantly affects the dynamic behavior of the bell tower.
Simplified mechanical model for the seismic vulnerability evaluation of belfries.
Online since: September 2013
Authors: Wen Hui Yue, Jian Xin Weng, Peng Hui Duan, Yong Xing Zhu
The surface cleaning of retired products and their components is an important step in remanufacturing process and a prerequisite for detection of the components’ surface size accuracy, geometric accuracy, roughness, surface properties, sticky situation and other performance accuracy.
With the common effort of many institutions who devote into laser cleaning research, conclusions are made about the laser processing conditions and the interaction between complex updrafts and mechanical factors[19,20].
Its mechanism may be the combined results of factors such as dynamics, thermodynamics and chemical reaction, which also allows the dry ice cleaning method to have multiple cleaning effects [21].
Compared with solid, liquid and gaseous materials, it has different physical and chemical properties, thus plasma is also called the fourth state of matter.
Chen: Mechanical Equipment Maintenance (Mechanical Industry Press, China 2001), pp.97-101.
Online since: April 2009
Authors: Nicole Stanford
The ductility of Mg-based alloys is strongly affected by two main factors.
This affected a significant increase in the yield point of the alloy.
The specimens with the fine grain size of 2.2µm showed some variability in properties, having tensile strength measurements of between 300 and 325MPa.
It is clear that the processing carried out here has moved the properties of the as-received AZ31 plate into a new property space on this plot.
This does not significantly affect the ductility
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