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Online since: December 2016
Authors: Md Jafor Iqball, Md Emdadul Hoque, Robiul Islam Rubel
Table 1 shows the properties of selected material that possess sufficient mechanical properties to be applied for selected lighter vehicle model.
In this case 3D mesh generated which is shown in Fig. 2(b) with properties of mesh body in Table 2.
Modal analysis is the study of the dynamic properties of structures under vibrational excitation.
(ii) Comparison study of mechanical properties among existing shaft material and locally available material.
Zelong Le, Stress concentration factors due to typical geometric discontinuities for shaft design by numerical simulation, 120th ASEE Ann.
Online since: August 2013
Authors: Samion Syahrullail, Tiong Chiong Ing
There are some factors affecting the biodegradability such as molecular structure, chemical properties and environmental conditions [3].
Some other properties of vegetable oil such as high viscosity index, good lubricity, high flash point and low evaporative loss [4] are measurable characteristics to choose the best lubricant.
Rapeseed oils have excellent lubricating properties, load carrying capacity, and corrosion protection properties compared to mineral oil.
However, vegetable oils have poor performances at high temperature and poor oxidation properties.
Summary The tribological properties of RBD palm olein have been investigated using four-ball tribometer at different operating temperatures.
Online since: June 2022
Authors: Yasameen Hadi Abed, Abdulhaq Hadi Abedali Al-Haddad
The properties of aggregate are presented in Table 2.
The properties of Dukan aggregate.
Rheological Properties by DSR.
Unknown factors values of fatigue model with R2 value.
Unknown factors values of rutting models with R2 values.
Online since: May 2011
Authors: Xue Jin Shen, Wei Jun Qi, Xiao Yang Chen
It was shown that the surface engineering and modification of surface chemical properties by various surface passivation treatments, deposition of hydrophobic coatings and lubrication with low surface energy self-assembled monolayers are effective methods for enhancing the fabrication and tribological performance of MEMS, but it was not concern with the effect of electrostatic tangential force in the MEMS devices.
Because of the surface falling charge, any surface can produce charge and then produce the electrostatic field and formed a resistance to prevent the move between two parallel and charged flat mechanical elements.
These holes would affect electrostatic field between two parallel plates, and lead to the capacitance and electrostatic resistance to change.To simplify the analysis, it is assumed that square holes are distributed evenly in the moving plate, shown in Fig. 2.
The factors of the microscale, applied voltage and holes area are primarily considered to examine the electrostatic resistance between two charged moving elements.
Hou: Chinese Journal of Mechanical Engineering.
Online since: August 2019
Authors: Dibakar Behera, Prasant Rath, Shivkumari Panda
The thermal, mechanical, dynamic mechanical, interfacial and tribological properties have been investigated.
So this affects overall properties of a composite.
Mechanical properties- Generally mechanical properties of composites depend on chemical modification, orientation of fibers and rate of interaction between fiber and matrix.
Again fiber orientation in composites shows strong anisotropic mechanical properties.
Shinji, Mechanical properties of kenaf fibers and kenaf/PLA composites, Mech.
Online since: March 2014
Authors: Qian Chu Liu, Gunnar Härkegård, Timothy J. Harrison, Bruce R. Crawford, Chris Loader, P. Khan Sharp
This paper reports the development of Monte-Carlo models of how pitting corrosion affects the location of fatigue failures in two fatigue specimen geometries that have different stress concentration factors (kt).
According to Opie [7], the gross stress concentration factor of the outer holes is 2.69 while that of the central hole is 2.48, which is 7.8% lower.
The stresses displayed in this figure are numerically equal to the stress concentration factor as the specimen is under a nominal gross-section stress of 1 MPa.
Next it will be necessary to characterize the fatigue crack growth and microstructural properties of the 7050-T7451 material from which the specimens have been made.
Computational Methods in Applied Mechanical Engineering 197 834-845 [14] Walker, K. (1970) The effect of stress ratio during crack propagation and fatigue for 2024-T3 and 7075-T6 aluminum.
Online since: June 2011
Authors: Che Hassan Che Haron, Jaharah A. Ghani, Hendri Yanda
Cutting condition, simulation models and material properties of carbide cutting tool and workpiece are shown in Table 2.
Table 2: Cutting condition to the simulation models and material properties Tool geometry of DNMA 432 Side Cutting Edge Angle (SCEA), deg -3 Back Rack angle (BR), deg -5 Side Rack angle (SR), deg -5 Nose angle, deg 55 Tool properties (WC as base material, uncoated carbide tool) Modulus young (GPa) 650 Thermal expansion 5e-06 Poison ratio 0.25 Boundary condition Initial temperature, deg.
C 20 Shear friction factor 0.6 Heat transfer coefficient at the interface, N/s mmoC 45 Workpiece geometry Depth of cut, mm 0.3 Width of cut, mm 3.4 Length of workpiece, mm 7 Workpiece properties (Ductile cast iron FCD500) Modulus elasticity (GPa) 169 Thermal conductivity (W/m.
All of these results were also agreeable with the theory, because the change of clearance angle will not affect the cutting force and stress, but the increase of clearance angle only affects slightly on the wear rate.
Kalhori, in: Modelling and Simulation of Mechanical Cutting, Doctoral Thesis, Institutionen for Maskinteknik, Sweden (2001)
Online since: May 2007
Authors: K. Cheng, Wen Jun Zong, T. Sun, Dan Li
The other physical properties, such as Young's modulus E, Poisson's ratio ν, specific heat C, material density ρ, thermal conductivity κ and thermal expansion coefficient λ, of OFHC copper and diamond are all listed in Table 1.
Table. 1 Physical properties of OFHC copper and diamond tool E [GPa] ν C [J/kg/ºC] ρ[kg/m 3] κ[W/m/ºC] λ[10-6/ºC] OFHC copper 128 0.3 385.5 8960 393.6 16.5 Diamond 1050 0.1 420 3520 1000 2.5 Heat transfer.
Temperature distribution properties indicate the extrusion effects of tool edge on machined surface and chip root are extremely intense.
Conclusions In present work, a FE cutting model is developed to emulate the diamond cutting process, with which the cutting temperature can be predict so as to analyze the factors influencing on it.
The simulated results indicate that, in diamond turning, the heat converting from plastic work is the primary source affecting the distribution shape of cutting temperature and the frictional heat is in the second.
Online since: March 2010
Authors: Zhen Zhong Sun, Sheng Gui Chen, Ye Jing
The compressive instability of the profile is influenced by many factors such as stress state, section geometry, blank length, die geometry, die clearance, contact conditions, and the mechanical properties of the profile.
The amount of spring-back is affected by stress state, section geometry, die geometry, and the mechanical properties of the profile.
�umerical Model The mechanical properties of the material are displayed in Table 1.
Table 1 Mechanical properties of material The FEM analyses are performed with the non-linear code PAM-STAMP2000.
Wrinkling Safety 45 90 135 180 0.0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0 α / ° β/° a: Simulation a: Experiment b: Simulation b: Experiment All of the above-mentioned factors are conveniently considered by the numerical simulation method.
Online since: December 2010
Authors: Wei Sun, Li Ping Guo, Qing Yu Cao, Jin Yu Zong
It leads to waste lots of money, to affect the normal transport security of vehicles and to shorten service life of secondary lining.
Test results Segregation property.
Furthermore, the inhomogeneous distribution of fibers in concrete will seriously affect the self-compacting performance of fresh concrete and the crack resistance of hardened concrete [5].
That means that the organic fibers are positive for obviously improving the anti-segregation property of fresh concretes.
It is clear shown in Table 1 that although mixtures of PVAF, PPF and PETF obviously decreasing the air voids content of concrete, the spacing factors and average chord lengths of concrete including these fibers are higher than 0.1mm.
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