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Online since: February 2012
Authors: A. Erman Tekkaya, Bernd-Arno Behrens, Annika Foydl, Insa Pfeiffer, Andreas Jäger, Matthias Kammler, Thorsten Matthias, Daniel Pietzka
The aim is to produce forging parts with locally adapted properties.
The mechanical properties of AA6082 used for the simulations were determined by means of upsetting tests at the IFUM using a servo hydraulic testing machine (Instron VHS 400 kN).The elastic-plastic properties of the embedded wires of the stainless steel X10CrNi18-8 (1.4310) were taken from the materials database of the FEA package.
The results of these investigations show for Tresca’s friction model with a factor of m = 1.0 good agreement of numerical and experimental determined material flow close to tool surfaces.
The position of the elements is mainly affected by the element position in the billet, the reinforcing element length itself and the extrusion ratio.
Analyses of the increasing mechanical strength of the reinforced forging parts compared to parts without reinforcements have to be carried out.
Online since: August 2013
Authors: Li Bao An, Shao Hua Zhen, Chun Rui Chang
Simulation on the Dielectrophoretic Assembly of Carbon Nanotubes Shaohua Zhen1,a, Libao An1,b,*, Chunrui Chang2,c 1College of Mechanical Engineering, Hebei Provincial Key Laboratory of Inorganic Nonmetallic Materials, Hebei United University, Tangshan, Hebei 063009, China 2College of Science, Hebei United University, Tangshan, Hebei 063009, China azhen_shaohua@163.com, blan@heuu.edu.cn, cchangchunrui@heuu.edu.cn *Corresponding author keywords: Carbon nanotubes, Dielectrophoresis, Assembly, Simulation.
Introduction Since their discovery in 1991, carbon nanotubes (CNTs) have attracted great research interests due to their unique one-dimensional structure and outstanding properties [1].
The DEP force due to the nonuniform electric field can be expressed by [15] , (1) , (2) where r is the radius of the particle; l is the longest dimension of the particle; εp is the permittivity of the particle; εm is the permittivity of the medium; KA is the Clausius-Mossotti factor which is related to the complex permittivity of both the particle and the medium.
The alignment of CNTs will be affected due to the existence of floating electrodes.
In the quadruple electrode structure, because the floating electrodes alter the electric field distribution, the alignment of CNTs will be affected.
Online since: January 2013
Authors: Lin Xiu Zhao, Si Guo Yuan, Jiao Sha, Shao Bin Li
The specific goal for the work reported here is to examine the effect of the pore structure of the polymeric adsorbents on adsorptive properties toward MB.
The polarity and pore size distribution of polymer adsorbents are also the important factors affecting adsorption.
If the pore diameter is too small, diffusion of adsorbate from the aqueous phase to the pores of the adsorbent will be hindered, thus affects the adsorption in a negative way.
Sheldon, Coagulation and precipitation of a mechanical pulping effluent-I.
Eiji, et al., Preparation of activated fibrous carbon from phenolic fabric and its molecular sieving properties.
Online since: March 2014
Authors: Doina Elena Gavrilă, Horia Catalin Gavrilă
The realization of HAMR involved some challenges from both optical design and media properties [3, 4].
It is based on the fact that the drastic decrease of the intrinsic magnetic properties of the medium (saturation magnetization Ms, anisotropy field, and coercive field Hc) when the temperature T of the media is increased.
Nevertheless, the lattice structure and the magnetic properties of the FePt-based alloys, correlated by the spin-orbital interaction, are affected by thermal agitation and, therefore, the heating and cooling issues are very important factors for HAMR media in both static and dynamic aspects [1].
Nevertheless, the technology based on lithography and nanoprinting involves the process of etching to form the magnetic bit, which damages the bit, thus affecting the magnetic anisotropy (and therefore the thermal stability) and increasing the switching field distribution.
A good choice of the layers separating the recording layer from the substrate (interlayer, seed layer and heat sink layer) is crucial from the viewpoint of the thermal design of HARM media so more as this design must take into consideration the magnetic, structural and even mechanical properties of the media configuration.
Online since: September 2014
Authors: Gui Yin Li, Guo Wei Shi, Long Fei Ma, Yong Huang, Guo Yin Huang, Shi Nin Yin, Ming Yuan Guan, Jin Tao Liang
Immunoglobulin G (IgG) is one of the most important factors in diagnosing some diseases in clinic.
Light-addressable potentiometric sensor(LAPS) is a biochemical sensor system based on field-effect that integrates light, mechanical and electricity[4].
Simultaneously, the device which is caused by field-effect is sensitive on potential changes between the insulating layer and an electrolyte solution interface, and the photocurrent concerned with the analytes concentration is obtained by using the photovoltaic properties of semiconductors.
Reactive group(-NH2) were lead into the surface of silicon wafers prepared through chemical modification, and the goat anti-human IgG antibody was immobilized by covalent cross-linking in order to prepare the sensitive membrane having specific recognition property of human IgG.
The immune response between antibodies and antigens occurring on the LAPS chips surface is used to affect the LAPS sensor.
Online since: August 2004
Authors: Su Sung Lee, Yong Rae Roh
For objective comparison of the performance, a normalized performance factor perf was proposed as Eq. 1.
For a good image quality, all the normalized performance factors are to be as small as possible, which leads to the minimum of the perf.
Summary We proposed a new design method that can determine the optimal sparse pattern of a 2D array transducer for 3D ultrasound imaging. 3D image qualities are affected not only by the side lobe level, grating lobe but also by main lobe properties, for example, on axis response and ripple in the main lobe.
Therefore we defined a performance factor, perf, that could describe the characteristics of radiation pattern and the on-axis response of a 2D array.
With the performance factor, we determined the optimal sparse pattern of a 2D array by the step-by-step method and the optimization method.
Online since: August 2020
Authors: Majid S. Mohammed, Mohammed L. Ahmed, Ziadoon M. Ali, Akram S. Mahmoud
Introduction Recently, many researchers have been conducted many researches deal with the sustainable materials or how to reduce the wastes in the world, such as using the polyethylene terephthalate PET wastes in concrete to enhance the mechanical properties of the concrete as well as produce an eco-friendly concrete [1,2].
Its chemical and physical properties and its compositions are given in Tables 1.
Table 1: Chemical and physical properties of tested cement Oxide Composition Abbreviation By weight% Limitations of specification Lime CaO 60.6 - Silica SiO2 22.4 - Alumina Al2O3 3.02 - Iron oxide Fe2O3 5.24 - Sulphate SO3 2.34 ≤ 5% Magnesia MgO 2.3 ≤ 2.8% for C3A ≥5% Loss on Ignition L.O.I. 2.27 ≤ 4% Lime saturation Factor L.S.F. 0.98 0.66-1.02 Insoluble residue I.R. 0.78 ≤ 1.5% Main compounds (Bogues eq.)
Loza Yañez, “Effects on mechanical properties of recycled PET in cement-based composites,” International Journal of Polymer Science, vol. 2013, no. 1, pp. 1–7, 2013
Roman, “Mechanical properties of recycled PET fibers in concrete,” Materials Research, vol. 15, no. 4, pp. 679–686, 2012
Online since: December 2014
Authors: Peter Futáš, Alena Pribulová, Marianna Bartošová, Jozef Petrík
Fluidity is the basic foundry property.
As far as metal characteristics are concerned, the following metallurgical factors can be listed as those which have greater or lesser effect on fluidity [1, 2].
The measuring system with high variability is not suitable for the analysis, since its variability can mask the variability of measured process The capability of measurement process is defined by statistical properties of multiple measurements obtained from the measurements, working in stable conditions.
Different results of inexperienced operator C affect the high value index %AV of MSA.
Hydrogen causes porosity in aluminum products leading to many casting defects, reduced mechanical properties like fatigue and lower corrosion resistance.
Online since: March 2012
Authors: Ping Jin, De Wang, Xiao Ming Tan
Hygrothermal behavior is an important factor need to be considered in the whole environment, and it is also the problem that all the composite materials must face.
In general terms, with properties being sensitive to the condition of environment, interlaminar shear and flexural properties are generally more sensitive to moisture than tensile properties, especially in high temperature[9].
As an important micro-structure, the performance of fiber-matrix interface affects the whole performance of composite materials directly[15].
(2) Mechanical hinge: This is produced by crack and roughness of the skin-face
References [1] Sun Tao: The influence of Pore on the Mechanical properties of CFRP on Hygrothermal Environment (Harbin engineering university, Harbin 2010), in Chinese
Online since: June 2019
Authors: Tao Wei, Da Zhang, Zai Qin Wang
In fact, in addition to viscosity, the surface tension and affinity of the slurry to the poured medium are also the main factors affecting the permeability [7].
The main physical and mechanical properties of CW epoxy grouting material are shown in Table 1.
The main physical and mechanical properties of CW epoxy grouting material Items 6:1 5:1 Initial setting time (h) 65 46 Slurry density(g/cm3) 1.06 1.07 Compressive strength (MPa) 62 68 Shear strength (MPa) 12 15 Tensile strength (MPa) 16 20 Bond strength (MPa) Dry 4.8 5.2 Wet 4.2 4.0 The method of sample preparation: After the samples were placed under standard test conditions for 24 hours, component B was slowly poured into component A according to the recommended mixing ratio and fully stirred and mixed evenly. 2.2 Test equipment and methods (1) The viscosity of CW epoxy resin slurry was measured by NDJ-79 rotary viscometer of Shanghai Changji Geological Instrument Co, Ltd, at different time and the test temperature was 23℃.
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