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Online since: February 2011
Authors: Hassan Azman, Muhammad Imran, Mat Uzir Wahit, Harintharavimal Balakrishnan
Effect of PA6/PP blend ratio Mechanical properties.
Effect of organoclay loading on the properties of PA6/PP nanocomposites Mechanical Properties.
Fig. 5 shows the mechanical properties of PA6/PP/organoclay/POE nanocomposites with different clay loading.
Effect of mixing sequence on the properties of PA6/PP nanocomposites Mechanical properties.
The effect of mixing protocols on the mechanical and morphological properties has been investigated [34].
Online since: April 2004
Authors: Young Doo Kwon, W.K. Choi, Hyun Wook Kwon, H.S. Choo
Choo2 1 School of Mechanical Engineering, Kyungpook National University, Daegu, Korea ydkwon@knu.ac.kr 2 Research Assistant, Kyungpook National University, Daegu, Korea Keywords: Center Segregation, HAZ(Heat Affected Zone), Temperature Distribution, Phase Distribution, Groove Type, Groove Angle ABSTRACT The time-dependent distributions of temperature and stresses in a box-column welded from ultra thick plates with a center segregation were analyzed using the commercial finite element package SYSWELD+ for several types and angles of groove.
The thermal properties, i.e. conductivity and specific heat, were found to be temperature dependent, plus the effects arising from a phase change, convection, and radiation were also taken into account. 1.
However, high-heat input welding enlarges the HAZ(Heat Affected Zone), which changes the micro-structure of the base metal and produces more residual stress.
Temperature boundary condition for 2-D for different welding velocities thermo-mechanical coupled analysis Figure 2 shows the temperature histories of three welding velocities.
These x-x directional stresses were the most important factors in relation to lamellar tearing that appeared at the center segregation.
Online since: December 2012
Authors: Er Qiang Li, Jia Wei Liu, Xin Jia Leng, Wen Guo Li
Through the thorough research, the basic theory of fully mechanized top-coal caving will be consummated, the stability and reliability of the system will be worked over by systems engineering, and the complex problems of equipment-selection and surround rock-displace which involved of many factors will be resolved.
At the same time, surrounding rock movement [1] and ancillary equipment and many other complex issues involving multiple factors can be solved. 1 Definition of fully-mechanized top-coal caving mining system Fully-mechanized top-coal caving mining system means a dynamic complex systems composed by face production systems, transportation and drainage and production auxiliary systems as well as the surrounding rock, supporting and its engineering geology, natural environment.
Excitation of the system (input) and response (output) is not a simple proportional relationship, but a very complex nonlinear mechanical relationship.
Thereby affecting the stability and reliability of the system.
Steady state parameters may vary with the parameters of the original state, but will not affect the overall performance of the system and structure.
Online since: January 2012
Authors: J. Cornide, Véronique Smanio, Thomas Sourmail, C. Capdevilla, Carlos Garcia-Mateo, Francisca G. Caballero
Evolution of microstructure and mechanical properties during tempering of continuously cooled bainitic steels.
Indeed, for a number of mechanical components, ferrite pearlite microstructures are no longer sufficient in terms of mechanical properties.
In the following, results are presented for three different bainitic steel grades, and the origins of the changes in mechanical properties are discussed.
Results Influence of tempering on mechanical properties.
However, this alone cannot explain the changes in mechanical properties.
Online since: March 2010
Authors: Mei Xiong
Therefore, it is necessary to study the mechanical characteristics of the crack tip near the interface.
No mater in what kind of structure, the interfacial behaviors of materials have great influence on the composite structure's mechanical properties.
The characteristics around the interface severely affect the interfacial mechanical behaviors.
Whereas the steel property is different with that of concrete, we get 22 22σ σ + − ≠ .
Stress Intensity Factor.
Online since: September 2013
Authors: Xun Bo Li, Bo Huang, Zhi Zeng, Xiang Li, Wen Hua Fang
Random vibration is one of the main factors influencing the reliability of electrical connectors.
However, the reliability of an electrical connector is affected by a lot of environmental factors, such as temperature, vibration, shock, drop or plug, etc.
In the model, we have established a database of contacts material properties such as density, Young’s modulus, Poisson’s ratio, etc.
Their material properties are shown in Table 1.
Table 1: Material properties Material properties Density [Kg/m3] Young's Modulus [Pa] Poisson's Ratio Plain carbon steel 8000 8.8E+10 0.30 Hard rubber 1100 2E+9 0.39 Sn-Ag-Cu solder joints 7400 4.84E+10 0.35 Copper wire 8800 1.12E+11 0.33 After parameters were defined and materials were added, we meshed the model which had 10460 elements and 22603 nodes.
Online since: August 2018
Authors: Maslina Jamil, Muhammad Fauzi Mohd Zain, Roszilah Hamid, Nurul Noraziemah Mohd Pauzi
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: December 2010
Authors: Min Feng, Peng Guo
affect the 5-day compressive strength, from large to small, is cement quantity→water and material ratio→polystyrene→fly ash→lime→gypsum, factors affect the 28-day compressive strength, from large to small, is water and material ratio→polystyrene→cement quantity→fly ash→lime→gypsum,1) cement quantity is the main factor of 5-day compressive strength.
While water and material ratio is small, consistency of paste slurry is great, mechanical property of paste is expressed by ultimate shear stress().is the maximum shear stress which paste can withstand.
Fig.1 Cement content on the properties of insulation block Fig.2 water and material ratio on the properties of insulation block The intermingled quantity of polystyrene is block’s volume ratio, polystyrene’s densisy is small and have a better thermal insulation properties.
Although CaO and gypsum are not the main affecting factors(Fig.4, Fig.5), CaO plays an important role in overall reaction and is the calcareous materials of producing aerated concrete.The function of which is to provide valid CaO, SiO2 containig silieous material and Al2O3 hydrothermal reaction.
(3)The ratio of water to material is the main affecting fators for polystyrene aerated concrete insulated block, and the ratio of water to material choosing between 0.36~0.38 will be better.
Online since: October 2010
Authors: Bin Yang, Jing Liu, Qi Kuang
Uniform and transparent ITO films were deposited onto quartz optical fibers through a sol-gel process, and the properties of the ITO films coated quartz optical fibers were investigated.
Good adhesion between ITO films and the surface of quartz optical fibers was achieved, and factors affecting the morphology, structure, and properties of the deposited ITO films were also discussed.
The morphology, resistivity and transmittance in visible region of ITO films under thermal shock and mechanical vibration condition were discussed to analyze the bonding strength between ITO films and the surface of quartz optical fibers.
The optical and electrical properties of treated ITO films.
(a) (b) Fig.7 Properties of ITO films with different treatment: (a) resistivity with measure distance and (b) transmittance in visible region.
Online since: February 2012
Authors: Kelvin K.M. Loh, Rayson H.C. Oh, Willy C.K. Tan
In addition to the tensile properties of the yarn, fabric weave structure is crucial as propagation of stress waves is affected by the weave structure.
In addition, optical light stimulation was also reported to have a slight improvement on the mechanical properties of the silk fibre.
However in some cases, an optimum value will be reached after which there will be a drop in mechanical properties.
In addition to yarn parameters playing an important role to the overall composite mechanical properties, fabric weave structure is also as important.
Stitching is another commonly used method to improve mechanical properties of weaved fabrics.
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