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Online since: October 2013
Authors: Jian Zhong Zhu, Jian Biao Chen, Chun Yan Yang, Zhi Fang Zhu
In addition, the main affecting factors were also analyzed on the properties of the biological ceramsite.
As shown in Fig.1, the weighing of each factor had significant difference, and the analysis of the results disclosed that the affecting factors of the density, the piled density, the apparent density and the void fraction were the expanded perlite, magnetic powder, cement (and magnetic powder), sodium bicarbonate, respectively.
Fig. 1 The relations between the levels of factors and the value of k Effect of magnetic powder on the properties of ceramsite.
Effect of cement on the properties of ceramsite.
The result analysis found the affecting factors of the density, the piled density, the apparent density and the void fraction were the expanded perlite, magnetic powder, cement (and magnetic powder), sodium bicarbonate, respectively.
Online since: February 2011
Authors: Fang Wang, Chao Ye, Jing Yi Wang, Yu Teng Wang, Song Tao Gao
In multi-layer work surface panels, different VOCs have different chemical and physical properties which will affect their transport properties and storage properties.
In this paper ambient temperature, relative humidity (RH), and air ventilation rate(ACR) and the board’s layup sequence are considered as the main factors[2,3,6] that may affect the emissions properties of VOCs from wooden fibre synthetic material when it is actually used in a building.
The diffusion coefficient (D) determines the rate of diffusion of a VOC through the material and is usually a function of several factors such as material type, compound properties, temperature, as well, in some circumstances, as the material-phase VOC concentration.
All these factors can be evaluated by inputting date, plotting curves, and analyzing result in spreadsheet.
Summary In multi-layer work surface panels, different VOCs have different chemical and physical properties which will affect their transport properties (e.g. diffusion coefficient) and storage properties (e.g. partition coefficient).
Online since: June 2013
Authors: Patricia Krawczak, Carla Isabel Martins, Vania M. Oliveira, Eric Lafranche
The mechanical properties were interpreted on the base of real fibre content, fibre orientation, fibre length and diameter distributions and morphology of the composites.
The fibre/matrix adhesion plays an important role on mechanical properties because of the transmission of composite loads to the fibres, as well as in its ageing behaviour.
For the young’s modulus prediction, the Cox-Krenchel’s model including both the measured fibre orientation and fibre ratio factors gives an improvement of the calculated values with regard to the experimental data, but a better definition of fibre properties linked with fibre shape ratio associated to an adjustment of matrix properties permitted to improve significantly the modulus evaluation by the Halpin-Tsai model.
Van den Oever, Mechanical properties of short-flax fibre reinforced compounds, Composites, Part A 37, 1591-1604 (2006)
Baley, Importance of fibre preparation to optimize the surface and mechanical properties of unitary flax fiber, Industrial Crops and Products, 32, 662-667, (2010)
Online since: March 2015
Authors: Hyouk Chon Kwon, Taek Kyun Jung, Hyo Soo Lee
This study was carried out to investigate the effects of grain size on mechanical properties in Cu-Sn foil with a thickness of 30 um.
Mechanical properties were found to be strongly affected by microstructural features including grain size.
It is well known that mechanical properties of metals are strongly influenced by grain size.
Fig.5 Tensile properties as a function of annealing time In thin films, grain size as well as film thickness has been considered as important factors that can affect tensile properties.
However, the mechanical properties obtained from the present study are not explained by this theory.
Online since: December 2010
Authors: Zhong Ji Zhang
Experimental Study on Fundamental Mechanical Properties of Autoclaved Sand-lime Brick Masonry ZhongJi Zhang School of Civil Engineering and Architecture, Changsha University of Science and Technology, Hunan Changsha, 410004 China Email: zzj6825@sohu.com Key word:Autoclaved Sand-Lime Brick Masonry;Compressive Strength Experiment ; Shear Strength Experiment ;Bending Tensile Strength Experiment Abstract: Experimental data are obtained by a series of fundamental mechanical properties experiments on autoclaved sand-lime brick masonry such as compressive strength experiment, shear strength experiment, bending tensile strength experiment, they provide the experiment evidence for writing Hunan province engineering construction local standard named "Technical specification for autoclaved sand-lime brick masonry building ".
Material properties Autoclaved sand- lime brick [Design strength respectively is MU10, MU15, MU20] Specimen preparation and test procedure follow the literatures [1, 2]. 200t pressure tester is used for pressure equipment.
Analysis of affecting factors of shear strength of autoclaved sand-lime brick masonry The full degree of the mortar joints directly affects masonry quality, thus affects the shear strength of along joint section of masonry [7].Combination of strength for mortar and block [8].
Because the same plate mortar is used in the second group and third group masonry in the article, the strength of the second group of specimens is the largest, after we exclude discrete factors of mortar, then the conclusion that there is an optimal combination of strength between mortar and block was drawn.
References [1] GB11945-1999,autoclaved sand-lime brick [s].Beijing: China Architecture and building Press, 1999.In Chinese [2] GBJ129—96, Basic mechanical properties of masonry test method [s].
Online since: January 2005
Authors: Cheng Yong Ma, Zhi Ling Tian, Yun Peng, Chang Hong He, Xiao Mu Zhang, Hong Jun Xiao, Zhi Yong Zhang
The characteristic shapes of porosity in weld metal are described, the mechanism of porosity formation is analyzed, and the factors that influence the tendency of porosity formation are studied.
Chemical compositions and mechanical properties of base plate are given in table 1.
Welding is a non-equilibrium state that is affected by various factors and porosity is liable to generate in weld metal.
The difference of physical properties between argon gas and helium gas is great.
Compared with the 100%Ar shield gas, the width of HAZ and softened zone is reduced, and the mechanical properties of welded joint are increased.
Online since: May 2020
Authors: Atiwat Wiriya-Amornchai, Prathumrat Nu-Yang, Jaehoon Yoon, Chainat Saechau, Poom Rattanamusik
This research aims to study the effect of thermal aging on the morphology and mechanical properties of thermoplastic vulcanizates (TPVs) based on a mixture of natural rubber (NR) and polystyrene (PS).
The real cause of the rubber prices declining now is because the amount of production and demand for rubber is not balanced, therefore affecting the selling price.
The mixed materials are called Thermoplastic elastomer (TPE) and can be used to improve properties by doing dynamic vulcanizates (DVs), which is called thermoplastic vulcanizates (TPVs), the results of the dynamic vulcanization process improve mechanical properties and solvent tolerance and can be used at high temperatures [1, 2].
Furthermore, the results of sample mixing were prepared for testing the mechanical properties (tensile strength, elongation at break and impact resistance) and morphology.
Morphological Properties.
Online since: March 2018
Authors: Abdulhamid Al-Abduljabbar
With very small volume fraction in the composite, nanoparticles are able to provide the composite material with strength and gas-barrier enhancements, without affecting other properties [1].
Since the filler weight ratio is very small, this occurs without affecting other favorable properties.
Results The models discussed in the previous section are analyzed here, to detect effects of different factors affecting the permeability of the nano-composite.
The interaction of the factors with the introduction of nano-fillers of different sizes is investigated.
The drastic reduction in permeability as the aspect ratio decreases is clear, without being affected by the other factors.
Online since: July 2013
Authors: Bin Feng, Deng Zun Yao, Liu Qing Yang, Yu Liu, Yu Ran Fan
Microstructure and Mechanical Properties of X80 Induction Heating Bends Liuqing Yanga, Yu Liub, Bin Fengc, Yuran Fand and Dengzun Yaoe Pipeline Research Institute of CNPC, Langfang, 065000, P.R.
By using physical thermal simulation technology, combined with metallographic analysis, tensile tests, impact and hardness tests, effects of heating temperature and cooling speed on microstructure and mechanical properties of X80 induction heating bends were investigated.
In conclusion, as to the induction heating bends made from controlled rolled pipes, especially that bends made of high-strength ones, multiple factors affecting the quality and performance must be considered and some key problems should be analyzed and investigated [3-5].
As is seen from Fig. 9a, cooling speed has a strong influence on tensile properties of X80 induction heating bends.
(2) Effects of cooling speed on the microstructure and mechanical properties of X80 induction heating bends were also investigated.
Online since: July 2016
Authors: Gheorghe Nagit, Mihai Boca, Laurentiu Slatineanu
The resistance spot welding process represents the welding technology used to obtain assemblies trough welded spots characterized by adequate mechanical properties.
As input factors, in this study, the values of current intensity, the electrical current time and the force pressure were considered.
Introduction The mechanical performances such as durability and structural behavior of most mechanical assemblies used in automotive engineering depend on both their mechanical design and the mechanical properties of the parts and also, not at the last, on the conditions of joining components.
This fact can affect microstructure and mechanical properties of the metallic parts joined [1].
Zhou, Microstructure and mechanical properties of resistance spot welded advanced high strength steels, Materials Transactions, Vol. 49, No. 7, (2008 1629-1637
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