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Online since: April 2012
Authors: Q. Zhu, C.M. Sellars, D.A. Linkens, Eric J. Palmiere, I.C. Howard, S. Das, M.F. Abbod
All properties (intrinsic or extrinsic) are homogenous over this material region.
Changing this distribution affects the predictions.
The nf-CAFE model is based on the internal states and predicts the deformed material properties.
A major benefit of this modelling technique is the modelling of the dynamic evolution of the internal states, while still providing accurate final material properties in terms of stress/strain relationships.
A second advantage is the ability of the model to predict the material properties at a micro-scale without the need for the high computational burden that would be imposed by reducing the mesh size of a straightforward macro–micro finite element model.
Online since: May 2014
Authors: F. García-Vázquez, B. Vargas-Arista, M.A. Gómez-Morales, E. Garfias-García
The ductile-brittle fracture transition is a characteristic well known of behavior from steels, which is influenced by factors as stress state, strain rate, microstructure, grain size and sample size [6].
There are not strength research related with the fractography of fracture surfaces on alloy steels such as SAE E52100 steel to understand the causes and effects of failure due to presence of precipitates on the fracture behavior, mechanical properties degradation and microstructural changes.
Both pins were fully hardened by quenched and tempered to obtain high mechanical and impact resistance.
The size of precipitates could affect the fracture behavior of pins failed.
Dieter, Mechanical Metallurgy, second Ed., McGraw Hill Book Co, United Kingdom, (1988) 471-500
Online since: December 2010
Authors: Jun Chang, Zheng Mao Ye, Wen Jie Tan
Raw Materials Portland cement clinker was provided by cement Plant in Shandong and gypsum was chemical Table 1 chemical compositions and mechanical property of clinker Chemical compositions /% Mechanical property SiO2 Fe2O3 Al2O3 CaO MgO f-CaO loss fineness compressive strength /MPa breaking strength /MPa m2/kg 3d 28d 3d 28d 20.83 4.91 5.98 63.75 1.16 1.17 1.83 400 28.3 45.7 4.8 8.1 reagent.
The chemical compositions and mechanical property of clinker are shown in Table 1.
Cement fineness affects the hydration of cement paste directly [4, 5].
From the change of amount of agglomeration, the degree of cement paste agglomeration is influenced by these factors directly, and the measurement results can show the change of the degree of cement paste agglomeration truly and completely, which has a good enantiotropy.
Online since: November 2016
Authors: Joy Anup, P.R. Deepa
Properties of recycled aggregate concrete is affected by type of concrete from which aggregate are generated [2].
The physical properties are shown in table1.
Table 2 shows the properties of fine aggregates.
Table 2 Properties of Fine aggregate Properties Fine aggregate Specific gravity 2.61 Fineness modulus 2.67 d.
Table 3 shows the properties of coarse aggregates.
Online since: November 2013
Authors: Mohsen Izadinia, Arash Khosravi, Amir Mahdi Moslemi, Mohaddeseh Heydari
Nano Silica is high pozzolanic material which is used recently in concrete to improve its mechanical properties.
Introduction Several factors are important in durability of concrete structure, such as permeability of concrete, concentration of sulfate and type of structure [1].
This is an important factor in permeability of concrete specimens which affects the resistance of concrete toward the sulfate attack[4].
Physical properties of Nano Silica Phase Specific gravity Ave particles size (nm) pH Electrical conductivity (mS/cm) Nano-SiO2 Clear liquid (colloid) 1.10 2.1 9-11 3.47 The properties of fine and coarse aggregate which is used in this study are shown in Table 2.
Properties of aggregate in concrete specimens Aggregate Max size (mm) Finesse Module (FM) Density(gr/cm3) Water absorption (%) Gravel 19 4.96 2.58 1.74 Sand 2.56 2.3 Preparation and testing procedure.
Online since: August 2025
Authors: Olha Biedunkova, Pavlo Kuznietsov
ST depends on several interrelated processes and factors [9].
Therefore, many factors affect the capacity and performance of ST: solids characteristics, fluid characteristics, and design parameters such as tank type, solids loading rate, surface loading rate, hydraulic retention time, weir placement, and solids removal mechanism [10].
The particle properties of multisized slurry were obtained from the image processing.
The obtained values of particle properties (CF, y, κ) indicate that SS cooling water RNPP has a crystal structure containing sharp edges and is relatively hard [21].
The findings provide critical insights into the physicochemical properties of SS and their implications for the design and operation of water treatment facilities.
Online since: June 2019
Authors: Barbara Kucharczyková, Dalibor Kocáb
The flooring compounds discussed herein are defined in terms of consistency and basic hardened-state properties.
The flooring compounds are described in terms of their fresh- and hardened-state properties.
Or, conversely, their composition and fresh-state properties do not allow them to be cast into specimens required by the standard [14].
Hoffman, Effect of redispersible powders on the properties of self-levelling compounds, Technical paper, Wacker Polymer Systems
Anderberg, Moisture properties of self-levelling flooring compounds Division of Building Materials, LTH, Lund University, 2004
Online since: June 2014
Authors: Mongkol Mongkolwongrojn, Kunchit Kuanoon
Effects of Slider Geometry Change on Helium Filled HDD Mongkolwongrojn, Mongkol1, a,Kuanoon, Kunchit2, b 1,2Department of Mechanical Engineering Faculty of Engineering, King Mongkut’s Institute of Technology Ladkrabang, Bangkok, 10520, Thailand aemail: kmmongko@kmitl.ac.th, bemail: kkkunchi@kmitl.ac.th Keywords: Modified Reynolds equation, Finite difference method, Helium filled HDD, Slider geometry change in crown and camber.
The dimensionless general modified Reynolds equation can be written as , and (1) and (2) The boundary condition are given as (3) where is the bearing number, U is the slider’s velocity, L is slider’s length, is reference spacing FH, is ambient pressure, is the Knudsen number, is the mean free path of gas and is the Poiseuille flow factor based on linearized Boltzmann equation can be written in equation (2) and the power-law formula can be used for the viscosity of the gas and the temperature written in equation (1) Fig. 1 The model of magnetic slider Fig. 2 The crow and camber of head slider Table 1 Properties of gas (Standard Pressure 101.325 kPa Table 2 Dimensional and calculation and temperature 273 K) parameters For the slider head in steady equilibrium condition, the force and balance moment equation can be written as , (4) The Slider curvature in slider length direction and slider curvature across two diagonal
It can be seen that the film pressure of gases between the slider and the disk are difference that affects to the flying height as shown in Fig. 4.
The change of slider geometry in crown and camber affects significantly on flying characteristics of slider head on the rotate disk.
Gonzage: Effects of Gas Physical Properties on Flying Performance of Air Bearing Slider, IEEE Trans.
Online since: February 2014
Authors: Hao Qin, Chun Li
Introduction Reliable operation and easy installation of pre-molded cable joint is the key factor to ensure the safety of electrical transmission.
Therefore, the interfacial stresses directly affect the surface discharge level of cable insulation, and to keep an appropriate value and uniform distribution of interfacial pressure will lead to good dielectric breakdown strength and reliable long-term performance of cable joint.
An axisymmetric simulation model of cable joint is established by using finite element software Abaqus based on the cable insulation, silicone rubber and semi-conductive layer material properties shown as Figure 1.
XLPE cable silicon rubber sleeve semi-conductive layer Fig.1 Axisymmetric simulation model of cable joint 2 Modeling of rubber material Rubber material is a kind of hyper-elastic material which has complex molecular characteristics, and the geometry and material nonlinear properties.
The mechanical behavior of rubber material is expressed in terms of strain energy potential U=UF, such that S=∂UF∂F where S is a stress measure and F is a measure of deformation.
Online since: November 2013
Authors: Joanna Przondziono, Witold Walke, Eugeniusz Hadasik, Stanisław Lalik
Goods after plastic forming feature better strength properties.
However, low strength properties of magnesium alloys with lithium additive pose a problem.
The experiment proved that increase of lithium content deteriorates corrosion properties of the alloy.
Another step is the search for suitable coatings for magnesium and lithium alloys protecting them from corrosion factors.
Rzychoń, Magnesium alloys – microstructure, properties and application.
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