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Online since: August 2011
Authors: Ze Yong Yin, Bi Bo Fu, Tong Bo Xue, Yong Hong Wang, Jie Gao
As reported, the power transmission system’s comprise almost 30% of the helicopter maintenance cost and 16% of the mechanical related malfunctions that often result in the loss of helicopter [2].
Magnetic suspension bearings and damping supporter would replace the conventional roller bearings and mechanical couplers [17].
The properties of porcelain rolling elements mainly depend on the composition of material, process of hot sintering and machining precision.
Keller: Mechanical Systems and Signal Processing, (2006), p. 2095 [4] Andrew M.
Berthier: New technologies, a factor of competitiveness for today’s helicopter, a must for tomorrows. 22th European rotorcraft forum and 13th European helicopter association symposium, 1996 [21] Charles Duello: BA609 tilt rotor drive system.
Magnetic suspension bearings and damping supporter would replace the conventional roller bearings and mechanical couplers [17].
The properties of porcelain rolling elements mainly depend on the composition of material, process of hot sintering and machining precision.
Keller: Mechanical Systems and Signal Processing, (2006), p. 2095 [4] Andrew M.
Berthier: New technologies, a factor of competitiveness for today’s helicopter, a must for tomorrows. 22th European rotorcraft forum and 13th European helicopter association symposium, 1996 [21] Charles Duello: BA609 tilt rotor drive system.
Online since: May 2020
Authors: Sergey Kuryntsev, Dmitry Kolesnikov, Mikhail Vulpe
It is generally believed that the penetration depth mainly depends on the welding heat input (the ratio of laser power to welding speed), but there is also a dependence on the thermophysical properties of the material being processed, the angle of the laser beam interaction with the workpiece [17], the focal distance [18], the optical system [19], shielding gas [20], spatial position [21], atmospheric pressure [22] and other.
By varying these factors, it is possible to obtain a defect-free welded joint at the level of technology development.
Fig. 3 shows the samples after bead on plate test, a – the top face, b – the root face, as it can be seen in all cases the penetration was full, which affects the hydrodynamics of the welding pool.
Mechanical Systems and Signal Processing, 49 (2014) 39-52
Katayama, Elucidation of high-power fiber laser welding phenomena of stainless steel and effect of factors on weld geometry.
By varying these factors, it is possible to obtain a defect-free welded joint at the level of technology development.
Fig. 3 shows the samples after bead on plate test, a – the top face, b – the root face, as it can be seen in all cases the penetration was full, which affects the hydrodynamics of the welding pool.
Mechanical Systems and Signal Processing, 49 (2014) 39-52
Katayama, Elucidation of high-power fiber laser welding phenomena of stainless steel and effect of factors on weld geometry.
Online since: March 2011
Authors: Joachim Zettler, Markus Bambach, Gerhard Hirt, Babak Taleb Araghi, Alexander Göttmann, Georg Bergweiler, Alireza Saeed-Akbari, Jan Bültmann
The difference is that in TPIF a partial or a full male die is used whereas in SPIF, no support is used, which affects the geometrical accuracy but increases the flexibility of the process.
To conclude this case study of ‘integrative part production’, mechanical properties (e.g. tensile tests) and surface quality of the final part have been investigated at the EADS research center ‘EADS Innovation Works’.
Fig. 9b shows that the material in the scenarios 5, 6, and 7, where mechanical twinning appeared, reached a higher hardness level.
The DRX mechanism based on discontinuous grain-boundary nucleation (DRX1) of Mg AZ31 sheets was found to be a significant factor in increasing the formability.
The DRX2, as seen in scenario 7, results in a completely different morphology within the microstructure, and consistently different mechanical properties compared with DRX1.
To conclude this case study of ‘integrative part production’, mechanical properties (e.g. tensile tests) and surface quality of the final part have been investigated at the EADS research center ‘EADS Innovation Works’.
Fig. 9b shows that the material in the scenarios 5, 6, and 7, where mechanical twinning appeared, reached a higher hardness level.
The DRX mechanism based on discontinuous grain-boundary nucleation (DRX1) of Mg AZ31 sheets was found to be a significant factor in increasing the formability.
The DRX2, as seen in scenario 7, results in a completely different morphology within the microstructure, and consistently different mechanical properties compared with DRX1.
Online since: June 2025
Authors: Vitaliy Georgievich Salamatov, Ludmila Alekseevna Savina, Ivan Vladimirovich Barinov, Igor Andreevich Pastukhov, Edmond Karenovich Poghosyan, Igor Olegovich Stasyuk, Valeriy Vasilyevich Savin
It is shown that heat treatment of MQ GAP powders improves their magnetic hysteresis properties and magnetoplasts made from them.
A number of requirements must be met for such magnetic materials in order to produce products with the required level of consumer properties [1-4].The level of consumer properties of Fe-Nd-B alloy products is determined by their chemical composition and structural and phase state [1, 2, 4].
The last factor (the amount of ternary eutectic) is the most important.
The level of achieved properties for the selected alloy compositions is comparable to similar properties of magnets made from ingots using the same technology.
Zhang, Synthesis and Properties of Al-Ni-La Bulk Metallic Glass, Advanced engineering materials.11 (2009) 530-532
A number of requirements must be met for such magnetic materials in order to produce products with the required level of consumer properties [1-4].The level of consumer properties of Fe-Nd-B alloy products is determined by their chemical composition and structural and phase state [1, 2, 4].
The last factor (the amount of ternary eutectic) is the most important.
The level of achieved properties for the selected alloy compositions is comparable to similar properties of magnets made from ingots using the same technology.
Zhang, Synthesis and Properties of Al-Ni-La Bulk Metallic Glass, Advanced engineering materials.11 (2009) 530-532
Online since: September 2021
Authors: Zainab Naser Jameel, Halah H. Rashed
CdS is ability to dope with the magnetic transition metals such as (Mn, Fe, Co and Ni) to achieve the desired properties and to make it multiplications, doped CdS has attracted great interest because it offers a fantastic chance to combine electrical, optical, magnetic and catalytic properties into a single material[10].
[3] Fanjing Wu, Lihua Yu , Hongbo Ju, Junhua Xu and Ji Shi ,“Influence of Cu Content on the Structure, Mechanical, Friction and Wear Properties of VCN–Cu Films”, Coatings, Vol.8, No. 95(2018) 1 -12
Subba Rao,“Structural Properties Of Nickel Doped Cadmium Sulfide”, J.
Sharma,“Effect of Nickel Doping on Optical Properties of CdS Nanoparticles Synthesized via.
[22] Mehmet and Yilmaz,“ Characteristic properties of spin coated ZnO thin films: the effect of Ni doping”, Physica Scripta, Vol.89 (2014) 1-7
[3] Fanjing Wu, Lihua Yu , Hongbo Ju, Junhua Xu and Ji Shi ,“Influence of Cu Content on the Structure, Mechanical, Friction and Wear Properties of VCN–Cu Films”, Coatings, Vol.8, No. 95(2018) 1 -12
Subba Rao,“Structural Properties Of Nickel Doped Cadmium Sulfide”, J.
Sharma,“Effect of Nickel Doping on Optical Properties of CdS Nanoparticles Synthesized via.
[22] Mehmet and Yilmaz,“ Characteristic properties of spin coated ZnO thin films: the effect of Ni doping”, Physica Scripta, Vol.89 (2014) 1-7
Online since: November 2021
Authors: Emīls Bolmanis, Andris Kazaks, Oskars Grigs
Heterologous protein yield is affected by a variety of strain- and cultivation-specific factors.
The most notable of the strain-specific factors include promoter selection and gene copy number (GCN) [4,5].
Using mechanical cell disruption methods, yeast cells release DNA, lipids and host cell proteins, which complicate the downstream processing.
Since cultivation in similar conditions following the Invitrogen protocol resulted in very poor HBsAg yields, the different medium used by Gurramkonda et al. could be the critical factor for HBsAg production of the particular recombinant strain.
Gurramkonda et al., Purification of hepatitis B surface antigen virus-like particles from recombinant Pichia pastoris and in vivo analysis of their immunogenic properties, J.
The most notable of the strain-specific factors include promoter selection and gene copy number (GCN) [4,5].
Using mechanical cell disruption methods, yeast cells release DNA, lipids and host cell proteins, which complicate the downstream processing.
Since cultivation in similar conditions following the Invitrogen protocol resulted in very poor HBsAg yields, the different medium used by Gurramkonda et al. could be the critical factor for HBsAg production of the particular recombinant strain.
Gurramkonda et al., Purification of hepatitis B surface antigen virus-like particles from recombinant Pichia pastoris and in vivo analysis of their immunogenic properties, J.
Online since: May 2009
Authors: Bao Sheng Liu, He Jun Liu, Elena Lyamina, Li Hui Lang
Kim et al [7] investigated AA6061
warm/hot hydromechanical tube forming under the different ranges of axial feeds by thermal
mechanical coupling simulation and calibration test.
Fields and Backofen[10] 0 50 100 150 200 250 300 0.0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 0.0006 s-1 0.006 s-1 0.06 s -1 Elongation Strain at Fracture, f Temperature oC 0 50 100 150 200 250 300 0 20 40 60 80 100 0.0006 s-1 0.006 s-1 0.06 s -1 Percentage Elongation /% Temperature oC 0 50 100 150 200 250 300 0 100 200 300 400 500 0.0006 s-1 0.006 s-1 0.06 s -1 Temperature oC Tensile Strength b /MPa (a) (b) (c) 0 50 100 150 200 250 300 -0.1 0.0 0.1 0.2 0.3 0.4 0.0006 s-1 0.006 s-1 0.06 s -1 Temperature oC Strain Hardening Exponent n 0.06 0.08 0.10 0.12 0.00 0.02 0.04 0.06 0.08 0.10 0.12 0.14 20 oC 150 oC 200 oC 250 oC True strain 300 oC Strain Rate Sensitivity Exponent m (d) (e) Fig. 4 Material properties under the influence of temperature or strain rate (a) Elongation strain at fracture f (b) Percentage elongation (c) Tensile strength b (d) Strain hardening
FEM simulation Warm/hot hydromechanical deep drawing process for a cylinder part is a nonlinear thermal mechanical coupling problem, which will be simulated in MSC.Marc with the stress-strain constitutive relations of 5A06 discussed.
Temperature also affects the drawing height, in Fig. 9(b), at 20oC, the drawing height is almost the same with the punch speed from 0.05 mm/s to 5 mm/s, the reduction of drawing height is only 4.6mm, but at 100oC, 200oC, 300oC, the value is separately 25.1mm, 37.5mm, 53mm. 0 50 100 150 200 250 300 0 20 40 60 80 100 120 0.05mm/s 0.5mm/s 5mm/s Temperature, oC Max.
In the forming procedure, actual contact surface between tools and blank increases as the external load goes up, more and more contact points enter into the plastic stage, metal begins to flow, some factors such as sliding velocity and pressure etc making influence on forming actually take effect by means of the contact surface roughness and lubrication.
Fields and Backofen[10] 0 50 100 150 200 250 300 0.0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 0.0006 s-1 0.006 s-1 0.06 s -1 Elongation Strain at Fracture, f Temperature oC 0 50 100 150 200 250 300 0 20 40 60 80 100 0.0006 s-1 0.006 s-1 0.06 s -1 Percentage Elongation /% Temperature oC 0 50 100 150 200 250 300 0 100 200 300 400 500 0.0006 s-1 0.006 s-1 0.06 s -1 Temperature oC Tensile Strength b /MPa (a) (b) (c) 0 50 100 150 200 250 300 -0.1 0.0 0.1 0.2 0.3 0.4 0.0006 s-1 0.006 s-1 0.06 s -1 Temperature oC Strain Hardening Exponent n 0.06 0.08 0.10 0.12 0.00 0.02 0.04 0.06 0.08 0.10 0.12 0.14 20 oC 150 oC 200 oC 250 oC True strain 300 oC Strain Rate Sensitivity Exponent m (d) (e) Fig. 4 Material properties under the influence of temperature or strain rate (a) Elongation strain at fracture f (b) Percentage elongation (c) Tensile strength b (d) Strain hardening
FEM simulation Warm/hot hydromechanical deep drawing process for a cylinder part is a nonlinear thermal mechanical coupling problem, which will be simulated in MSC.Marc with the stress-strain constitutive relations of 5A06 discussed.
Temperature also affects the drawing height, in Fig. 9(b), at 20oC, the drawing height is almost the same with the punch speed from 0.05 mm/s to 5 mm/s, the reduction of drawing height is only 4.6mm, but at 100oC, 200oC, 300oC, the value is separately 25.1mm, 37.5mm, 53mm. 0 50 100 150 200 250 300 0 20 40 60 80 100 120 0.05mm/s 0.5mm/s 5mm/s Temperature, oC Max.
In the forming procedure, actual contact surface between tools and blank increases as the external load goes up, more and more contact points enter into the plastic stage, metal begins to flow, some factors such as sliding velocity and pressure etc making influence on forming actually take effect by means of the contact surface roughness and lubrication.
Online since: November 2014
Authors: B.P. Chandra, V.K. Chandra, Piyush Jha
Size reduction affects most of the physical properties (structural, magnetic, optical, dielectric, and thermal, etc.) due to surface effects and quantum size effects.
Strain factors as well as broadening due to the instrument could also contribute to the broadening of the peaks.
Hence, PL spectra are accordingly affected.
Because of these two factors, the TL of small nanoparticles is expected to be more than that of the bulk.
Size reduction affects most of the physical properties (structural, magnetic, optical, dielectric, and thermal, etc.) due to surface effects and quantum size effects.
Strain factors as well as broadening due to the instrument could also contribute to the broadening of the peaks.
Hence, PL spectra are accordingly affected.
Because of these two factors, the TL of small nanoparticles is expected to be more than that of the bulk.
Size reduction affects most of the physical properties (structural, magnetic, optical, dielectric, and thermal, etc.) due to surface effects and quantum size effects.
Online since: May 2008
Authors: Samuel M. Allen, Robert C. O'Handley, Ratchat Techapiesancharoenkij
It might be expected that, at low drive frequency, the FSMA sample should be little affected by
the piezo vibration and only move back and forth in a rigid-body mode.
Some of the input energy is converted into heat instead of mechanical strain.
The smaller values of the observed stress reductions relative to the calculated values could be due to several factors.
The magnitude and speed of the stress waves are calculated based on the elastic properties of Ni-Mn-Ga crystals.
Hixson in: Mechanical Impedance, edited by C.M.
Some of the input energy is converted into heat instead of mechanical strain.
The smaller values of the observed stress reductions relative to the calculated values could be due to several factors.
The magnitude and speed of the stress waves are calculated based on the elastic properties of Ni-Mn-Ga crystals.
Hixson in: Mechanical Impedance, edited by C.M.
Online since: June 2013
Authors: Daniel J. Miller
Other environmental factors do affect the design of submarine equipment but are directly linked to shock integrity and ultimately the strength of the material.
Therefore, given the uncertainty in the mechanical behaviour and shock response of composite materials for this application, extensive material testing and structural analysis, specifically Finite Element Analysis (FEA) must be carried out to validate the design.
This environment could be manipulated to ensure that the resin had the best conditions to fully cure and hence provide the required adhesion properties for the testing.
Item Type/Model Gauge Resistance [Ω] Gauge Factor Strain gauge Rosettes (3 arm) FRA-6-11-1L & CEA-06-062UR-120 120.0 ± 0.5% 2.08 (nom) Strain gauge Single (1 arm) EA-06-250BG-120 120.0 ± 0.15% 2.060 ± 0.5% The tabs and the lead-wire connections were sealed together as a single patch using bees wax which provides an initial layer of waterproofing, Fig 8.
The strain gauge itself had a flexible protective membrane which provided mechanical resistance as well as a secondary waterproof layer.
Therefore, given the uncertainty in the mechanical behaviour and shock response of composite materials for this application, extensive material testing and structural analysis, specifically Finite Element Analysis (FEA) must be carried out to validate the design.
This environment could be manipulated to ensure that the resin had the best conditions to fully cure and hence provide the required adhesion properties for the testing.
Item Type/Model Gauge Resistance [Ω] Gauge Factor Strain gauge Rosettes (3 arm) FRA-6-11-1L & CEA-06-062UR-120 120.0 ± 0.5% 2.08 (nom) Strain gauge Single (1 arm) EA-06-250BG-120 120.0 ± 0.15% 2.060 ± 0.5% The tabs and the lead-wire connections were sealed together as a single patch using bees wax which provides an initial layer of waterproofing, Fig 8.
The strain gauge itself had a flexible protective membrane which provided mechanical resistance as well as a secondary waterproof layer.