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Online since: May 2020
Authors: E.V. Saltanova, Vladimir E. Absimetov, Denis B. Solovev
A significant part of such structures operates in a complex stress state when exposed to natural and technological environments that cause irreversible physical and chemical changes in the properties of materials.
As the analysis of the scientific literature shows, this is objectively due to the complexity of the metal-protective coating system, the versatility of physical and chemical processes and the influence of various factors on these systems in penetrating media, and insufficient studies of some stages and processes of their interaction.
Most researchers proceed from the concept that a coating film does not affect the mechanism of metal corrosion, but affects only the kinetics of the process, acting as a diffusion barrier.
Protection of metal against corrosion by paint and varnish, as well as by polymer coatings is determined by the following factors: mechanical insulation of the metal from the corrosive environment; adhesion preventing the formation of a new phase (rust) at the metal-coating interface; by slowing down electrode reactions causing the corrosion process by creating conditions for metal passivation; by structural transformations in the films that determine the properties of the coatings.
The composition of AKS-K is effective both in moderately aggressive and highly aggressive environments, and the composition of AKS-B shows protective properties only in moderately aggressive environments • The protective properties of coatings from the developed compositions are not much dependent on their thickness, which allows to apply one-layer coating under careful drying and degreasing the surface of metal structures; • coatings of the compositions AKS-K and AKS-B, applied over rust, significantly surpass the standard coating systems by the protective properties; • a characteristic feature of coatings from AKS-B is that they retain their protective properties in a highly aggressive environment when applied onto a rusty surface, while, when applied onto a clean surface, these coatings are completely destroyed after 7-8 cycles.
Online since: July 2012
Authors: Yu Ping Dong, Fei Qiang Guo
Table 1 summarizes the properties of herb residues.
Table 1 Properties of herb residue Fuel Herb residues Proximate [wt.%] Moisture 12.5 V 72.62 FC 12.41 Ash 2.47 Ultimate [wt.
Results and discussion Temperature and pressure profiles Operating temperature is one of the most important factor affecting the working performance of the fluidized gasifier, and T1, T3, T5, T7 are chosen to represent the temperature of the riser.
The results indicate that the biomass and air feed rates are important influencing factors of the temperature.
Effect of O/B The O/B ratio (g/g) is a crucial factor that affects the performance of the gasification process.
Online since: November 2011
Authors: Wen Fang Gao
Research reveals that the formation of slivers is closely related to the processes of steel making and rolling as well as conditions of equipment in operation, and, in most cases, due to different factors affecting together.
Therefore, during steel making and rolling, it is an important target to achieve good surface quality while maintaining good chemical composition, metallographic structure and mechanical property of the strip.
Discussion Analysis of cause of the defect As previously described, sliver defects on the surface of cold rolled strip present in different features, and the affecting factors and forming mechanism are very complicated.
It’s clear that the causes of defects are very complicated, the affecting factors involving steel making, continuous casting and rolling, as well as status of equipment in operation.
It’s necessary to have a comprehensive analysis on various affecting factors as regards all the related procedures in the whole steel making and rolling process before conclusion could be made.
Online since: July 2012
Authors: Chun Yan Xia, Xiao Hui Xia
Towards the highway bridges, the main factors affected automobile riding comfort is deck roughness and bridge vibration caused by passing vehicle.
Random Bridge Deck Roughness Random bridge deck roughness is an important factor affecting the vehicle-bridge dynamic response of highway bridges.
In engineering practice, the power spectral density is usually used to describe the statistical properties of random road deck roughness.
Recent research demonstrates that speed and bridge deck roughness are the most significant factors for vehicle vertical dynamic response[4].
References [1] Hu Zhendong and Wang Hua-Lin, “Analysis of Comfort Properties for High-Speed Vehicle Moving Over Bridge,” Vibration and Shock, vol. 21, pp. 104-107, 2002
Online since: July 2013
Authors: Julian Allwood, Martin McBrien
Each start-up requires significant time to reach steady operation with consistent product properties.
Mechanical and EM Edge Dams for Twin Roll Casting.
The EM edge dam design is constrained by several external factors.
Material properties are taken from Smithells Metal Reference [5].
An impedance boundary condition is used for the steel parts, which takes into account the skin depth of the rolls and caster structure based on their material properties and operating frequency.
Online since: August 2016
Authors: Mohamed Arif Azmah Hanim, M.N. Mohamad Aznan, R. Muhammad Raimi, A. Muhammad Azrol Amin
Lead free solder such as SAC237, SAC305 and SAC405 are currently studied because of the low melting temperature which is nearer to SnPb, superior mechanical properties and good compatibility [2]-[4].
Each pad finishes have its own properties and characteristics in terms of how it affects the solder joint reliability, IMC, and cost [5, 6].
As reported in Ewald et al., there are two major factors that may cause the formation of voids [9].
These include the temperature profile and the properties of flux used in the solder paste.
Jeffrey, A review of mechanical properties of lead-free solders for electronic packaging, Journal of Materials Science, 2009, 44, (5), 1141-1158
Online since: August 2018
Authors: Maslina Jamil, Muhammad Fauzi Mohd Zain, Nurul Noraziemah Mohd Pauzi, Roszilah Hamid
It was demonstrated that the morphology properties of GS and GC (shape, surface texture, size, grading) is significantly affected the concrete properties. 1.
Besides shape and texture, the maximum size and grading of coarse aggregates also affecting the concrete properties.
Conclusion It was demonstrated that the type of coarse aggregates with respect to morphology is significantly affects the concrete properties.
Turan Ozturan, Effect of coarse aggregate type on mechanical properties of concrete with different strengths, Cem.
Maslehuddin, Effect of coarse aggregate quality on the mechanical properties of high strength concrete, Constr.
Online since: January 2014
Authors: Tie Tian, Lin Mi, Xing Zi Mao
Introduction Magnesium alloys is a structural material with good properties such as low density, high specific strength and high specific stiffness.
And, The main factors that affect the damping test results are the specimen deformation mode (whether conforms with the damping mechanism), the form of constraints of the specimen and the measurement accuracy of the test system.
Based on the above issues, this article gives detailed description on the current damping test principles of magnesium alloys, damping characterization parameters and testing equipment and devices, According to the main factors that affecting the damping test results of magnesium alloys, pointing out the suitability of all testing equipment and schemes for damping test of magnesium alloys and revealing the testing equipment and schemes that apply to the damping mechanism of magnesium alloys and that meet requirements of damping test of magnesium alloys.
At present, loss factor () is adopted for measuring the damping capacity of the tested specimen as calculated by equation (4) [6].
At present, it is mainly used for measuring the relationships between damping and temperature, and damping and strain of the metallic materials. 3.4 Dynamic thermal mechanical analyzer Dynamic thermal mechanical analyzer (DMA) is a measuring instrument with dynamic mechanical property that adopts the principle of subresonance method.
Online since: September 2008
Authors: Fernando Martínez, E. Tynan, M. Arregui, G. Obieta, J. Aurrekoetxea
The behaviour of the sensor to impact is also compared to the response in static, and the different factors affecting the sensor response in both conditions are described.
Yang: Characterization of the residual mechanical properties of woven fabric reinforced composites after low-velocity impact (International Journal of Mechanical Sciences 47 (2005) 647)
Online since: December 2012
Authors: Rui Feng Wang, Hu Ping An, Zhi Yuan Rui, Zhi Mei Zhang
The nonlinear equations of indices related to some factors for measuring deformation degree of chip have been ascertained.
Introduction High speed machining (HSM) is a new rapid developed technology for mechanical industry in the present world.
The average factor of deformation for trapezia chip become
Shear strength relates to character of material, deformation of chip and cutting temperature as well as degree and velocity of deformation. 3 Conclusions Through the analysis of character of shear slippage of plastic metal at HSM, indices of measuring deformation are determined and main factors affecting deformation are probed into, building model of cutting and equation of deformation.
A new multi-view approach to characterize 3D chip morphology and properties in end milling titanium Ti-6Al-4V[J].
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