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Online since: February 2018
Authors: R. Rajesh, V. Balasubramanian, S. Sree Sabari, Medha R. Elayidom, Duraisamy Thirumalaikumarasamy
The microstructure and the mechanical properties of the coating are affected by the spraying parameters, like the spraying power, stand-off distance and powder feed rate, etc.
They correlated the obtained response equations based on the experimental designs with the responses relevant to microstructure, mechanical, and electrical properties of coatings deposited using various thermal spray and post-spray processes.
It has been broadly recognized in the thermal spray community that there are many hundreds of parameters, which can potentially affect the properties of the coatings.
The circular contour plot indicates that the interactions between the corresponding factors are insignificant, while the elliptical contour plot indicates that the interactions between the corresponding factors are significant [25].
[27] H.Guo, S.Kuroda, and H.Murakami, Microstructures and Properties of Plasma-Sprayed Segmented Thermal Barrier Coatings, J.
They correlated the obtained response equations based on the experimental designs with the responses relevant to microstructure, mechanical, and electrical properties of coatings deposited using various thermal spray and post-spray processes.
It has been broadly recognized in the thermal spray community that there are many hundreds of parameters, which can potentially affect the properties of the coatings.
The circular contour plot indicates that the interactions between the corresponding factors are insignificant, while the elliptical contour plot indicates that the interactions between the corresponding factors are significant [25].
[27] H.Guo, S.Kuroda, and H.Murakami, Microstructures and Properties of Plasma-Sprayed Segmented Thermal Barrier Coatings, J.
Online since: December 2013
Authors: Khairul Azwan Ismail, S.M. Nasir, Norshah Afizi Shuaib, Z. Shayfull
Warpage problem was categorized in aesthetic properties in injection molding process [1].
Properties for both types of material are shown in Table 1 and 2 respectively.
Table 1: Physical and Mechanical Properties of ABS Properties Value Specific heat, Cp (J/kgoC) 1464.7 Thermal conductivity, K (w/moC) 0.178 Melt density, (g/cm3) 0.96 Elastic modulus, E (MPa) 2.24 x 103 Poisson's ratio, υ 0.392 Table 2: Properties of P20 Mold Steel Properties Value Mold density, (g/cm3) 7.8 Mold specific heat (J/kgoC) 460 Thermal conductivity, K (w/moC) 29 Elastic modulus, E (MPa) 2.0e5 Poisson's ratio, υ 0.33 Mold coefficient of thermal expansion (1/C) 1.2e-5 Injection Molding Setup.
The best set of parameters can be determined by selecting the significant factors that affects to warpage in Table 7.
From Table 9 and 10, the results of maximum percentage contribution (P) show the most significant factor that affect the warpage value.
Properties for both types of material are shown in Table 1 and 2 respectively.
Table 1: Physical and Mechanical Properties of ABS Properties Value Specific heat, Cp (J/kgoC) 1464.7 Thermal conductivity, K (w/moC) 0.178 Melt density, (g/cm3) 0.96 Elastic modulus, E (MPa) 2.24 x 103 Poisson's ratio, υ 0.392 Table 2: Properties of P20 Mold Steel Properties Value Mold density, (g/cm3) 7.8 Mold specific heat (J/kgoC) 460 Thermal conductivity, K (w/moC) 29 Elastic modulus, E (MPa) 2.0e5 Poisson's ratio, υ 0.33 Mold coefficient of thermal expansion (1/C) 1.2e-5 Injection Molding Setup.
The best set of parameters can be determined by selecting the significant factors that affects to warpage in Table 7.
From Table 9 and 10, the results of maximum percentage contribution (P) show the most significant factor that affect the warpage value.
Online since: November 2006
Authors: M. Azeem Ashraf, Bijan Sobhi-Najafabadi, Michael G. Ellis, Hung Yao Hsu
For simplicity,
the model is based on sliding distance as input variable, while other factors like temperature, load,
surface conditions are treated as constant.
Along with the chemical and physical properties of the materials in contact, wear is dependent on a combination of intrinsic and extrinsic factors, which makes it a dynamic response of the mechanical system in consideration [2].
Due to the difficulty in dealing with large number of variables affecting the wear phenomenon and the incomplete nature of the wear theory, experimental verification of the model is an integral part of any wear modeling effort [2].
Mechanical wear is classified in four major modes: Adhesive, Abrasive, Erosive and Fatigue [5].
Thus, the accuracy of the wear model can be improved if combined effects of geometry and material properties are added.
Along with the chemical and physical properties of the materials in contact, wear is dependent on a combination of intrinsic and extrinsic factors, which makes it a dynamic response of the mechanical system in consideration [2].
Due to the difficulty in dealing with large number of variables affecting the wear phenomenon and the incomplete nature of the wear theory, experimental verification of the model is an integral part of any wear modeling effort [2].
Mechanical wear is classified in four major modes: Adhesive, Abrasive, Erosive and Fatigue [5].
Thus, the accuracy of the wear model can be improved if combined effects of geometry and material properties are added.
Online since: October 2022
Authors: Emmanuel O. Sangotayo, Olukunle E. Itabiyi
Impact of the Thermophysical Properties of a CuO-H2O-Based Nanofluid on the Performance of a Cylindrical Solar Concentrator
Emmanuel O.
The results demonstrated that increasing the mass flow rate of the nanofluids improves the heat transmission properties.
The impact of thermophysical attributes on thermal effectiveness results in improved thermal efficacy, heat transfer characteristics of nanofluids, and factors influencing its features in solar collectors, which determines its usability.
Concentration, structure, dimensions, substance, base fluid, and temperature all affect the properties of nanoparticles.
Also the ANOVA-based analysis of the interaction between nanofluid thermophysical properties and PTSC performance confirms, with 95% confidence, that there is a significant variance in the interactions between nanofluid thermophysical properties and thermal efficiency at different flow rates, and that thermophysical properties have a significant impact on PTSC performance.
The results demonstrated that increasing the mass flow rate of the nanofluids improves the heat transmission properties.
The impact of thermophysical attributes on thermal effectiveness results in improved thermal efficacy, heat transfer characteristics of nanofluids, and factors influencing its features in solar collectors, which determines its usability.
Concentration, structure, dimensions, substance, base fluid, and temperature all affect the properties of nanoparticles.
Also the ANOVA-based analysis of the interaction between nanofluid thermophysical properties and PTSC performance confirms, with 95% confidence, that there is a significant variance in the interactions between nanofluid thermophysical properties and thermal efficiency at different flow rates, and that thermophysical properties have a significant impact on PTSC performance.
Online since: January 2016
Authors: Jiu Hua Xu, Hai Xiang Huan, Ying Fei Ge
Introduction
Titanium matrix composites (TMC) have higher specific stiffness/strength, higher wear/corrosion resistance, higher anti-fatigue performance and better high-temperature properties, which are recognized as one of the new materials to replace titanium alloys.
Most of the research mainly focused on the tool life, cutting temperature and cutting forces investigation based on the single factor method in which the significance of the affected factors and the interaction between the factors were not studied.
Thus, it can be concluded that radial depth of cut and cutting speed are the two significant influences factors based on the Taguchi prediction that the larger different between value of S/N ratio will have a more significant effect on cutting force (F).
Schwartz Cerm, Ti discontinuously reinforced Ti-matrix composites: manufacturing, Properties and Applications, JOM 56(5) (2004) 37-41
Karthikeyan, Assessment of factors influencing surface roughness on the machining of Al/SiC particulate composites, Mater.
Most of the research mainly focused on the tool life, cutting temperature and cutting forces investigation based on the single factor method in which the significance of the affected factors and the interaction between the factors were not studied.
Thus, it can be concluded that radial depth of cut and cutting speed are the two significant influences factors based on the Taguchi prediction that the larger different between value of S/N ratio will have a more significant effect on cutting force (F).
Schwartz Cerm, Ti discontinuously reinforced Ti-matrix composites: manufacturing, Properties and Applications, JOM 56(5) (2004) 37-41
Karthikeyan, Assessment of factors influencing surface roughness on the machining of Al/SiC particulate composites, Mater.
Online since: September 2013
Authors: Mohd Hanafiah Abidin, Ahmad Zafir Romli, M.A. Wahab, Mohd Zaki Nurul Ayunie
EFFECT OF EPOXIDIZED PALM OIL LOADING ON THE SWELLING AND MECHANICAL PROPERTIES OF SBR VULCANIZATES
NURUL AYUNIE Mohd Zaki1, a, A.Z.
This study is conducted to investigate the effects of epoxidized palm oil on the mechanical properties of SBR vulcanizates especially in terms of their tensile behaviour.
Tensile properties were measured using Shimadzu Universal Testing Machine at speed of 500 mm/min.
Other factors that can affect the swelling index are length of network chain, temperature and types of solvents [9] .
Fig. 2 Graph of crosslink density (mol/g RH) and swelling index against EPO content Conclusion The presence of large amount of EPO in the rubber vulcanizates gives very clear effects on their physical properties especially for tensile properties.
This study is conducted to investigate the effects of epoxidized palm oil on the mechanical properties of SBR vulcanizates especially in terms of their tensile behaviour.
Tensile properties were measured using Shimadzu Universal Testing Machine at speed of 500 mm/min.
Other factors that can affect the swelling index are length of network chain, temperature and types of solvents [9] .
Fig. 2 Graph of crosslink density (mol/g RH) and swelling index against EPO content Conclusion The presence of large amount of EPO in the rubber vulcanizates gives very clear effects on their physical properties especially for tensile properties.
Online since: January 2016
Authors: Triwulan Triwulan, Januarti Jaya Ekaputri, Muhammad Bahrul Ulum, Ratni Nurwidayati, Priyo Suprobo
The physical, chemical and mechanical properties of geopolymer are strongly influenced by the properties of raw material such as fly ash [1, 2].
The percentage of reactive silica (SiO2) was the most important factor in chemical properties of fly ash.
The physical and chemical properties of fly ash were studied related to mechanical properties to find out the reactivity of fly ash.
So that soluble fly ash has significant effect to mechanical properties of geopolymer rather than cement paste.
[2] Diaz, E.I.; Allouche, E.N.; Eklund, S., "Factors affecting the suitability of fly ash as source material for geopolymers," Fuel, vol. 89, p. 992–996, 2010
The percentage of reactive silica (SiO2) was the most important factor in chemical properties of fly ash.
The physical and chemical properties of fly ash were studied related to mechanical properties to find out the reactivity of fly ash.
So that soluble fly ash has significant effect to mechanical properties of geopolymer rather than cement paste.
[2] Diaz, E.I.; Allouche, E.N.; Eklund, S., "Factors affecting the suitability of fly ash as source material for geopolymers," Fuel, vol. 89, p. 992–996, 2010
Online since: October 2014
Authors: Chun Hsu Shen, Chung Long Pan, Wei Cheng Lin, Shin Hung Lin, Sheng Kai Huang
The microwave dielectric properties of dielectric resonators were also deeply affected by the liquid sintering temperature due to the development of microstructure at low sintering temperature or reaction between host material and addition.
The dielectric properties of 9MCCLT-based ceramics were characterised.
The formation of Second phase [(Mg0.95Co0.05)Ti2O5] might affect the microwave dielectric properties of 9MCCLT ceramics.
It may directly affect the microwave dielectric properties of the ceramic samples.
CONCLUSION The effect of 3Z2B addition on the microwave dielectric properties and the microstructures of MCCLT ceramics were investigated.
The dielectric properties of 9MCCLT-based ceramics were characterised.
The formation of Second phase [(Mg0.95Co0.05)Ti2O5] might affect the microwave dielectric properties of 9MCCLT ceramics.
It may directly affect the microwave dielectric properties of the ceramic samples.
CONCLUSION The effect of 3Z2B addition on the microwave dielectric properties and the microstructures of MCCLT ceramics were investigated.
Online since: February 2012
Authors: Jun Jie Zhang, Gan Hua Liu, Hong Zhi Yan
Based on this assumption there is no need to assign its mechanical properties and thus, only thermal properties were defined.
Four factors are expressed as A, B, C and D, respectively.
Table 1 Factors and levels of cutting force Levels Factors A v(m/min) B f(mm/r) C λ(°) D β(°) 1 180 0.06 8 10 2 220 0.09 10 13 3 260 0.12 12 15 4 300 0.15 14 18 The interaction between factors was not considered in this experiment.
Cutting force affects directly the amount of cutting heat and further impacts on tool wear, the accuracy of works.
In addition to affect significantly cutting force, feed f is also closely related with the processing time.
Four factors are expressed as A, B, C and D, respectively.
Table 1 Factors and levels of cutting force Levels Factors A v(m/min) B f(mm/r) C λ(°) D β(°) 1 180 0.06 8 10 2 220 0.09 10 13 3 260 0.12 12 15 4 300 0.15 14 18 The interaction between factors was not considered in this experiment.
Cutting force affects directly the amount of cutting heat and further impacts on tool wear, the accuracy of works.
In addition to affect significantly cutting force, feed f is also closely related with the processing time.
Online since: December 2009
Authors: A. Habibzadeh, B. Davoodi, B. Jabbaripoor, M.H. Sadeghi
These two factors result in increase and concentration of
temperature and pressure on cutting edge and also abrasion wear of the tool through diffusion
mechanism and its thermal fatigue.
A large number of investigations have been performed to study this process and the parameters affecting it.
Stevenson, Study on the correlation of workpiece mechanical properties from compression and cutting tests, J.
Kolsky, An investigation of the mechanical properties of materials at very high rates of loading, Proceedings of Physical Society, Vol.62 (1949), 676-700
Liu, Mechanical properties of hardened AISI 52100 steel in hard machining processes, J.
A large number of investigations have been performed to study this process and the parameters affecting it.
Stevenson, Study on the correlation of workpiece mechanical properties from compression and cutting tests, J.
Kolsky, An investigation of the mechanical properties of materials at very high rates of loading, Proceedings of Physical Society, Vol.62 (1949), 676-700
Liu, Mechanical properties of hardened AISI 52100 steel in hard machining processes, J.