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Online since: September 2024
Authors: Mohamad Midani, Tamer Hamouda, Said Awad, Ahmed Mohareb, Menna Badawy
Several factors, such as low cost, low density, biodegradability, availability, absence of associated health hazards, and they are relatively non-abrasive.
Temperature, microorganisms, radiation, moisture, and other environmental factors all affect rate of disintegration and degradation.
This is because RPVC does not have the same biodegradable properties as PLA.
Valadez-González, Mechanical properties of continuous natural fibre-reinforced polymer composites, Compos Part A Appl Sci Manuf 35 (2004) 339–345. https://doi.org/10.1016/j.compositesa.2003.09.012
Fan, Date palm fibre geometry and its effect on the physical and mechanical properties of recycled polyvinyl chloride composite, Ind Crops Prod 174 (2021) 114172. https://doi.org/10.1016/j.indcrop.2021.114172
Temperature, microorganisms, radiation, moisture, and other environmental factors all affect rate of disintegration and degradation.
This is because RPVC does not have the same biodegradable properties as PLA.
Valadez-González, Mechanical properties of continuous natural fibre-reinforced polymer composites, Compos Part A Appl Sci Manuf 35 (2004) 339–345. https://doi.org/10.1016/j.compositesa.2003.09.012
Fan, Date palm fibre geometry and its effect on the physical and mechanical properties of recycled polyvinyl chloride composite, Ind Crops Prod 174 (2021) 114172. https://doi.org/10.1016/j.indcrop.2021.114172
Online since: August 2016
Authors: Aldo Roberto Boccaccini, Qiang Chen, Cristina M. Arévalo, Carlos Romero, Gonzalo Pérez, Laura Álvarez, Yadir Torres, José Antonio Rodríguez-Ortiz, Juan José Pavón
Microstructural properties of porous Ti substrates.
Mechanical properties of porous Ti substrates.
Consequently, the above facts and considerations would suggest the need of changing deposition parameters, i.e. deposition time, in order to affect other factors like the mean pore size.
Hanada, Mechanical properties of porous titanium compacts prepared by powder sintering, Scripta Materialia 49 (2003) 1197–1202
Collings, Materials Properties Handbook: Titanium Alloys.
Mechanical properties of porous Ti substrates.
Consequently, the above facts and considerations would suggest the need of changing deposition parameters, i.e. deposition time, in order to affect other factors like the mean pore size.
Hanada, Mechanical properties of porous titanium compacts prepared by powder sintering, Scripta Materialia 49 (2003) 1197–1202
Collings, Materials Properties Handbook: Titanium Alloys.
Online since: August 2014
Authors: Zhi Qin Qiao, Yan Li Li
Domestic and overseas studies have shown that the gradation and asphalt are two key factors for asphalt mixture.
Material property Basic properties of raw materials The experiment uses 90# asphalt, the results of each test index is shown in Table 1, all meet specification requirements.
Fig1 Graph of grading curve Performance-related properties of asphalt mixture Preparation of specimens Mix design employed the Superpave analysis system to determine the optimum asphalt content.
Table 4 Passing percentage of three types graded asphalt mixture Type of gradation Passing percentage of sieve ,% 25 19 13.2 9.5 4.75 2.36 1.18 0.6 0.3 0.15 0.075 AG 100 95 80 68 45 36 29 22 15 9 4 ZG 100 95 80 68 45 35 25 19 14 9 4 BG 100 95 80 68 45 29 19 14 11 9 4 High-temperature stability of asphalt mixture Asphalt mixture is a kind of viscoelastic material, physical and mechanical properties are closely related to the temperature and loading time.
Table 5 Summary of rutting test results Type of gradation Dynamic stability, times/mm Rut depth in 45 minutes, mm Rut depth in 60 minutes, mm Relative deformation,% AG 2072 2.932 3.254 6.5 ZG 1457 4.943 5.409 10.8 BG 2704 3.071 3.333 6.7 Many factors affect the high temperature stability of asphalt mixture; mainly include varieties and properties of asphalt, asphalt content, aggregate particle shape, aggregate gradation, voids, traffic volume and temperature etc.
Material property Basic properties of raw materials The experiment uses 90# asphalt, the results of each test index is shown in Table 1, all meet specification requirements.
Fig1 Graph of grading curve Performance-related properties of asphalt mixture Preparation of specimens Mix design employed the Superpave analysis system to determine the optimum asphalt content.
Table 4 Passing percentage of three types graded asphalt mixture Type of gradation Passing percentage of sieve ,% 25 19 13.2 9.5 4.75 2.36 1.18 0.6 0.3 0.15 0.075 AG 100 95 80 68 45 36 29 22 15 9 4 ZG 100 95 80 68 45 35 25 19 14 9 4 BG 100 95 80 68 45 29 19 14 11 9 4 High-temperature stability of asphalt mixture Asphalt mixture is a kind of viscoelastic material, physical and mechanical properties are closely related to the temperature and loading time.
Table 5 Summary of rutting test results Type of gradation Dynamic stability, times/mm Rut depth in 45 minutes, mm Rut depth in 60 minutes, mm Relative deformation,% AG 2072 2.932 3.254 6.5 ZG 1457 4.943 5.409 10.8 BG 2704 3.071 3.333 6.7 Many factors affect the high temperature stability of asphalt mixture; mainly include varieties and properties of asphalt, asphalt content, aggregate particle shape, aggregate gradation, voids, traffic volume and temperature etc.
Online since: September 2011
Authors: Yu Hou Wu, Li Xiu Zhang, Li Yan Wang
The air-gap is changed due to the influence from various factors not only the tolerance of the manufacture and assembly of motorized spindle but also different working condition.
Its dynamic properties play a very important role on performance of high-speed machine tools.
Vibration performance of Motorized spindle affected the processing quality directly.
There are three factors impact on air-gap change, such as temperature of motorized spindle, tolerance of the manufacture and assembly and the eccentricity between the stator and rotor.
Knight, A.M. et al. studied change of air-gap due to mechanical fault by monitoring Stator current [2].
Its dynamic properties play a very important role on performance of high-speed machine tools.
Vibration performance of Motorized spindle affected the processing quality directly.
There are three factors impact on air-gap change, such as temperature of motorized spindle, tolerance of the manufacture and assembly and the eccentricity between the stator and rotor.
Knight, A.M. et al. studied change of air-gap due to mechanical fault by monitoring Stator current [2].
Online since: April 2012
Authors: Ahmad Kamal Ariffin, A.E. Ismail, I.A. Shah, D.A. Wahab, M.R. Jamli
As the experimental will be simulated by FEM, the accuracy of the inverse method is also affected by various computational factors.
Table 1 shows the mechanical properties of the material.
Table 1 Mechanical properties of DP600 sheet steel Material Young’s modulus[GPa] Poisson Ratio Yield Stress[MPa] Density[kg/m3] DP600 207 0.3 420 720 Displacement load BC: symmetry BC: Uy=Uz =0 BC: symmetry BC: ROTx =0 Fig. 3 Three point bending test FE-model By assuming the three-point cyclic bending test as a part of metal forming processes, quasi-static analysis has been considered to determine the reaction force at the loading point.
The loading rate shall be artificially increased to a factor of 1000.
This could be performed by artificially increase the mass to a factor of 1000000.
Table 1 shows the mechanical properties of the material.
Table 1 Mechanical properties of DP600 sheet steel Material Young’s modulus[GPa] Poisson Ratio Yield Stress[MPa] Density[kg/m3] DP600 207 0.3 420 720 Displacement load BC: symmetry BC: Uy=Uz =0 BC: symmetry BC: ROTx =0 Fig. 3 Three point bending test FE-model By assuming the three-point cyclic bending test as a part of metal forming processes, quasi-static analysis has been considered to determine the reaction force at the loading point.
The loading rate shall be artificially increased to a factor of 1000.
This could be performed by artificially increase the mass to a factor of 1000000.
Online since: June 2013
Authors: Yi Xi Cai, Xiao Hua Li, Dan Wu, Chao Li
The factors that impact the performance of thermoacoustic conversion are the impedance characteristics of loudspeaker, standing-wave resonator and structure parameter of stack.
There are many factors influencing properties of thermoacoustic conversion, such as the material, length, pore diameter and wall thickness of stack, position of stack in sound filed and so on.
If the stack spacing is too large, an inevitable part of the area will not participate in the thermoacoustic heating, thus affecting the conversion efficiency of thermoacoustic.
As we can see from figure4 ,when the source frequency below 210 Hz, the temperature difference at both ends of stack will rise with the source frequency rises; When the source frequency was more than 210 Hz, the physical properties of the gas and the impedance characteristics of loudspeaker are all effect the working frequency.
Mechanical Fluid, 2009, 37(4): 79-81
There are many factors influencing properties of thermoacoustic conversion, such as the material, length, pore diameter and wall thickness of stack, position of stack in sound filed and so on.
If the stack spacing is too large, an inevitable part of the area will not participate in the thermoacoustic heating, thus affecting the conversion efficiency of thermoacoustic.
As we can see from figure4 ,when the source frequency below 210 Hz, the temperature difference at both ends of stack will rise with the source frequency rises; When the source frequency was more than 210 Hz, the physical properties of the gas and the impedance characteristics of loudspeaker are all effect the working frequency.
Mechanical Fluid, 2009, 37(4): 79-81
Online since: September 2011
Authors: Alojz Ivanković, Marin Petrović, Neal Murphy
An advantage of these materials is that their structure and composition can be engineered to return properties required for specific applications and operations.
In this study, the mechanical and fracture properties of two grades of PCD have been determined at dynamic loading rates up to 5 m/s and elevated temperature up to 600°C in laboratory conditions using three point bending (TPB) and split-Hopkinson pressure bar apparatus (SHPB).
Having said that, the main aim for the manufacturers of the drilling bits is to understand the fracture process of these materials and try to improve their fracture properties.
Materials and Methods In this study, high temperature testing chambers, a laboratory scale three point bend test rig and a split-Hopkinson pressure bar apparatus have been designed and used for testing the fracture and mechanical properties of two different grades of PCD: G6 grade constituted of 6μm average grain size and G30 grade constituted of 30μm average grain size.
The stress intensity factor acting at the crack tip may be reduced due to these thermal stresses, thus causing microcracks and fracture to occur at lower load levels.
In this study, the mechanical and fracture properties of two grades of PCD have been determined at dynamic loading rates up to 5 m/s and elevated temperature up to 600°C in laboratory conditions using three point bending (TPB) and split-Hopkinson pressure bar apparatus (SHPB).
Having said that, the main aim for the manufacturers of the drilling bits is to understand the fracture process of these materials and try to improve their fracture properties.
Materials and Methods In this study, high temperature testing chambers, a laboratory scale three point bend test rig and a split-Hopkinson pressure bar apparatus have been designed and used for testing the fracture and mechanical properties of two different grades of PCD: G6 grade constituted of 6μm average grain size and G30 grade constituted of 30μm average grain size.
The stress intensity factor acting at the crack tip may be reduced due to these thermal stresses, thus causing microcracks and fracture to occur at lower load levels.
Online since: March 2012
Authors: Maizlinda Izwana Idris, Imran H. Ghazali, Chan Wen Shan
The mechanical properties of flexible PU foams filled with coconut coir fibres and recycled tyre were investigated.
Thus, there is a trade-off in between both, mechanical and damping properties of composite.
Hence, the purpose of the paper is to studied the mechanical properties of filled-foams developed.
Since the dispersion level and orientation of fillers are almost similar for foams with recycled tyre and coir fibres inclusion, thus, the others from the listed will be the main factors in affect the compression properties.
This is actually unexpected since an increment of treated coir to foam composites are supposedly to be positive factor for mechanical properties improvement, at least compare with those having small amount of coir fibres inclusion.
Thus, there is a trade-off in between both, mechanical and damping properties of composite.
Hence, the purpose of the paper is to studied the mechanical properties of filled-foams developed.
Since the dispersion level and orientation of fillers are almost similar for foams with recycled tyre and coir fibres inclusion, thus, the others from the listed will be the main factors in affect the compression properties.
This is actually unexpected since an increment of treated coir to foam composites are supposedly to be positive factor for mechanical properties improvement, at least compare with those having small amount of coir fibres inclusion.
Online since: June 2011
Authors: M. Foroutan, M.E. Aalami-Aleagha, S. Pirmoradi
Distribution of residual stresses in the welded pipes is affected by several factors, such as pipe geometry, input heat, welding sequence and joint groove geometry.
Several three dimensional models are presented in the last decay[4-6].In these models a simple mesh has been used and effects of factors such as pipe geometry, electrode speed and input heat power have been studied.
In these elasto-plastic analyses, elastic strain are modeled by isotropic Hook's law with temperature dependent mechanical properties, given in Table 2.
For the plastic part of deformation, Von Mises isotropic bilinear hardening model with temperature dependent material property was used.
Thermo-mechanical properties of tube are given in Table 2.
Several three dimensional models are presented in the last decay[4-6].In these models a simple mesh has been used and effects of factors such as pipe geometry, electrode speed and input heat power have been studied.
In these elasto-plastic analyses, elastic strain are modeled by isotropic Hook's law with temperature dependent mechanical properties, given in Table 2.
For the plastic part of deformation, Von Mises isotropic bilinear hardening model with temperature dependent material property was used.
Thermo-mechanical properties of tube are given in Table 2.
Online since: September 2013
Authors: Gaetano S. Palazzo, Pierpaolo Carlone
Pultrusion process: scheme (a); tapered inlet (b); Couette flow in the liquid region (c); mechanical properties computation in the gel zone (d); TCR between die and material surfaces (e).
This force acts along a direction normal to die surfaces, thus not affecting the pulling force except at the tapered die entrance (Fig. 1b).
Moreover, taking into account the non-homogeneous and anisotropic nature of the composite material, lumped properties (herein computed following the rules of mixtures [2-6,10,12]) should be introduced.
The post-processing of thermochemical results provided viscosity profiles, as well as work piece dimensional changes and mechanical properties distribution in the cross section (Fig. 4a).
Vaughan, An analysis of factors affecting pull force for the pultrusion of graphite/epoxy composites, J.
This force acts along a direction normal to die surfaces, thus not affecting the pulling force except at the tapered die entrance (Fig. 1b).
Moreover, taking into account the non-homogeneous and anisotropic nature of the composite material, lumped properties (herein computed following the rules of mixtures [2-6,10,12]) should be introduced.
The post-processing of thermochemical results provided viscosity profiles, as well as work piece dimensional changes and mechanical properties distribution in the cross section (Fig. 4a).
Vaughan, An analysis of factors affecting pull force for the pultrusion of graphite/epoxy composites, J.