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Online since: September 2019
Authors: Sergey Anatolyevich Kotov, Bogdan Valerevich Avramishin, Evgenii Michalovich Fedorov
Experiment Currently, there are two types of processing of solid alloy - mechanical and physico-chemical, each of these methods has its advantages and disadvantages.
Mechanical: 1.1.
• The homogeneity of the initial mixture affects the uniformity of the size of the obtained powder Installations for EDM dispersion In 1971, Japanese researchers developed an installation for producing aluminum hydroxide by electro-erosion dispersion [2].
The use of aluminum electrodes, on the surface of which an oxide film is formed, having a high contact resistance, reduces energy consumption by a factor of 5–8, but the powder must be washed from aluminum erosion products [10].
Fabrication, Structure and Properties of a Composite from Aluminum Matrix Reinforced with Carbon Nanofibers.
Online since: June 2010
Authors: Michael Kellam, Daniel Liang, Michael Dolan, Guang Sheng Song
Introduction Refractory metals such as V, Nb and Ta are coated with Pd to constitute a composite membrane for hydrogen separation since these metals easily form oxide layers, and the surface reaction affects hydrogen transport [1,2].
Various mechanical and chemical techniques are used to achieve this aim.
Further work is required to evaluate its mechanical properties such as toughness and fracture strength. 30 40 50 60 70 80 90 100 110 120 2θθθθ (degree) Intensity (a.u) BCC V(!
The origin of the internal stress as a factor leading to crack formation is key to understanding hydrogen embrittlement.
Peisl, in: Hydrogen in Metals I: Basic Properties, Edited by G.
Online since: March 2008
Authors: Giovanni Bruno, Jonas Gurauskis, Jesus Ruiz-Hervias, A.J. Sanchez-Herencia, C. Baudin
Initially developed in the 60´s as a result of the necessity of laminated structures for the packaging of microelectronics [1], the interest was extended into structural applications for improved mechanical performance [2].
Apart from these reasons, the economical and ecological factors [4] forced the appearance of new lamination techniques for the manufacturing of laminated ceramics.
Residual stresses due to anisotropic shrinkage of the laminate tapes or originated by the thermo-mechanical compression have been invoked as responsible for strength and toughness increases [5-7].
The understanding of the effect of green processing on the properties of laminates is crucial to differentiate processing from compositional effects in order to develop new materials with improved properties.
In this sense it is important to count with a suitable experimental technique that allows the analysis of residual stresses in the bulk of the materials, thus, not affected by surface effects.
Online since: September 2020
Authors: Tetiana Zhydkova, Olha Popova, Svitlana Chepurna
Improvement of physical-mechanical properties and decorative features of such concretes is achieved due to the introduction of additives which have a different nature of influence.
Adsorption of the amorphous form of silica on the surface of the carbonate particles of the chalk leads to surface recharging, which explains the difference of the electro-surface properties of the fine chalk from other carbonate materials.
Given that particles of fine chalk can form additional centers of crystallization, accordingly, there is a change in the quantitative ratio of structure-forming and destructive factors during the synthesis of strength of cement stone and concrete.
In this case, the complex compounds, the formed hydrocarbonates, contribute to the increase of water resistance, frost resistance, sulfate resistance of concrete and, accordingly, leads to improvement of decorative properties.
Based on the above, it was assumed that the addition of highly dispersed organogenic calcite (chalk) to the composition of the calcium is the formation of calcium hydrocarbons and low-basic calcium silicates, which improves the physical and mechanical properties and decorative concrete.
Online since: March 2015
Authors: Sergey Pryakhin, Vasili Rubanik
Brinson has modified the constitutive equation of Tanaka by introducing the dependence of transformation strain on the single internal variable component xS and the dependence of the elastic properties on the total martensite fraction, i.e., xS + xT.
In the construction of the kinetic relations the following functions of alternating-sign stress s and temperature T will be used: (20) where the factors are bound to the kinetic parameters by the following equations: ; ; ; ; . (21) The functions in Eq. 20 denote the linear combinations for the current loading components s, T.
The properties for the NiTi alloy listed in Table 1 were used.
The values for the thermal coefficient of linear expansion (TCLE) are taken from [14], the other properties from [5].
Collings (Eds.), Material Properties Handbook: Titanium Alloys, American Society for Metals, Material Park, OH, 1994, pp. 1035-1048
Online since: January 2016
Authors: Iulian Antoniac, Ana Iulia Blajan, Aurora Antoniac, Greta Vitioanu, Isidoro Giorgio Lesci
These materials present some important factors like self-assembly and a hierarchical structure [30].
They are made from one or more ceramic part and a little percent of proteins, and when combined together, these components provide an amazing biocomposite with special mechanical properties.
Collagen has very important properties like characteristics mechanical, high versatility, degradability, hemostatic and cell-binding properties.
Also, hydrothermal synthesis along with sol-del fabrication can assure better mechanical properties of bioceramics.
Seki, Biological materials: Structure and mechanical properties, Prog.
Online since: February 2022
Authors: Alexander E. Volkhonskiy, Kirill V. Dudkov, Ludmila V. Boksha
The disadvantages of unmodified ABS plastic include relatively low electrical insulation properties compared to polystyrene, as well as low weather resistance, in particular sensitivity to UV rays.
Depending on the composition of the copolymer, the properties of ABS plastic can vary in a wide range.
One of the main tasks of modifying polymers is to adjust their properties in the right direction.
The ABS plastic can be foamed, filled with highly dispersed substances, short glass fibers, flame retardants and other components that will change its properties.
Conclusions The body of the aerodynamic model, made using 3D printing technology from the Accura 60 photopolymer material, has all the required properties set by OST 92-8875-2014.
Online since: July 2014
Authors: R. Thundil Karuppa Raj, Sadhana Mishra, Rohit Tripathy
A Numerical Investigation on the Performance of an Earth Air Heat Exchanger System for the Indian District of Nagpur Rohit Tripathy1, a*, Sadhana Mishra1, b, Thundil Karuppa Raj R.2, c 1School of Mechanical and Building Sciences, VIT University, Vellore-632014, Tamil Nadu 2 Professor, Energy Division, School of Mechanical and Building Sciences, VIT University, Vellore-632014, Tamil Nadu arohitkt10@gmail.com, bsadhana.mishra92@gmail.com , cthundil.rajagopal@vit.ac.in* *Corresponding Author: thundil.rajagopal@vit.ac.in Keywords: Earth Air Heat Exchanger, CFD, discretization, heat exchanger, soil temperature Abstract.
It was found that the heat transfer between the air, pipe and surrounding soil was not significantly affected by the variation in material between PVC and mild steel.
The properties are as follows [8]: Thermal conductivity- 5.73 W/m/K, Density- 1400 kg/m3 and Specific Heat Capacity – 1471 J/kg/K Validation of CFD Model The CFD model used in the present work is validated against the experimental work of R.
Aggarwal, Comparison of thermal properties of three texturally different soils under two compaction levels, African Journal of Agricultural Research, 8(28), 3679-3687, 2013 [9] Rohit Misra, Vikas Bansal, Ghanshyam Das Agrawal, Jyotirmay Mathur, Tarun K.
Aseri, CFD analysis based parametric study of derating factor for Earth Air Tunnel Heat Exchanger, Applied Energy 103 (2013) 266–277
Online since: January 2014
Authors: Chao Chen
Because the adhesive for all kinds of wood-based panel domestic production mostly contains toxic substances formaldehyde, we can choose green non wood-based board, such as wheat straw man-made board and veneer materials which are lightweight, durable, waterproof, mothproof and the mechanical processing performance are good with no free formaldehyde pollution.
For the third class, hard outfit of large area makes the color, luster, texture contrast of the selected materials in the overall style plays a key role in distinguishing the space functional properties.
The use of materials directly affects the quality and the environment comfort.
This requires us to establish a correct concept of sustainable material design: Establish the sustainable design of decorative materials, the rational use of materials design and moderate use to reduce the construction loss; Try to reduce artificial processing, using scissors, cutting, folding, curving, tearing and other design methods to process materials so as not to cause the second pollution; Pay attention to the design and the junk material collection, for recycling "second materials", using the design method for fully playing heat of waste materials; Get familiar with material properties as much as possible to prolong its service life; Make full use of the redundant relations between materials, materials and other media, in order to meet the design effect and space experience of twice the result with half the effort.
In all interior design groups, a lot of people will consider the financial factors, want to create a fashion, environmentally friendly indoor space in compliance with customers’ mind, which must be a very good understanding of material characteristics, and especially the new materials.
Online since: February 2012
Authors: Quan Kun Liu, Ling Yun Qian, Ya Li Zhao
(4) (2) Permanent radial displacement caused by plastic deformation should not affect the dimensional accuracy of extrusion part, so it should be limited in a certain range.
Finite Element Simulation Finite element modeling The material properties for die are elastic modulus E =2.1×105MPa, Poisson's ratio m=0.3, tensile yield strength σs =1240MPa, the reverse compression yielding strength is 1066MPa when taking into account the Bauschinger effect and set Bauschinger effect factor BEF=0.86[6].
The maching accuracy of parts is also an important factor in the mold design.
Material properties of inner and outer layers are assumed to be the same as autofrettaged die.
Chinese Journal of Mechanical Engineering, Vol.47(12) (2011),26-31(in Chinese).
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