Sort by:
Publication Type:
Open access:
Publication Date:
Periodicals:
Search results
Online since: November 2018
Authors: Reiner Anderl, Peter F. Pelz, Nils Preuss, Moritz Weber, Georg Staudter
Therefore, facilitating the sharing and reuse of data as well as avoiding redundant studies are key factors for success.
(ii) Auxiliary information describing properties and characteristics of utilized equipment.
Knowledge of equipment properties is needed to reduce uncertainty when identifying measured quantities of an experiment and investigating the plausibility of results.
Each type must be described via respectively characteristic properties to enable definite interpretation.
Discussion and Conclusion Facilitating the sharing and reuse of data as well as avoiding redundant studies are key factors for success within a collaborative research environment.
(ii) Auxiliary information describing properties and characteristics of utilized equipment.
Knowledge of equipment properties is needed to reduce uncertainty when identifying measured quantities of an experiment and investigating the plausibility of results.
Each type must be described via respectively characteristic properties to enable definite interpretation.
Discussion and Conclusion Facilitating the sharing and reuse of data as well as avoiding redundant studies are key factors for success within a collaborative research environment.
Online since: June 2017
Authors: Yu.V. Ilyukhin, Ruslan Kolesnichenko
The suggestions of improving properties of servo drives with elastic gears on the whole concern introduction of various corrective and compensative links which are not always efficient in practice due to the influence of nonlinearity of the type “dead zone” which describes the backlash.
Accuracy depends on several factors.
For instance, in case of milling with end mill the following relation can be used , (2) where, – proportional coefficient, which takes into account material properties of the machined workpiece and the tool, diameter , number of teeth and rotation frequency ; – exponent indexes.
The form of the matrix of the controllers significantly affects the matrix of the system dynamic stiffness .
In order to improve the dynamic properties of such robots it is feasible to apply impedance control, which can be realized by introducing corrective control loops of the manipulator links velocity.
Accuracy depends on several factors.
For instance, in case of milling with end mill the following relation can be used , (2) where, – proportional coefficient, which takes into account material properties of the machined workpiece and the tool, diameter , number of teeth and rotation frequency ; – exponent indexes.
The form of the matrix of the controllers significantly affects the matrix of the system dynamic stiffness .
In order to improve the dynamic properties of such robots it is feasible to apply impedance control, which can be realized by introducing corrective control loops of the manipulator links velocity.
Online since: March 2019
Authors: Xiao Guang Yang, Duo Qi Shi, Xue Feng Teng
Experimental studies were carried out to build the relationships between hysteresis measurements and the constituent properties of CMCs[4] [5] .
Vagaggini and Domergue[4] developed a methodology to assess constituent properties of CMCs with relatively few hysteresis loop measurements, and investigated the influence factors of unload/reload hysteresis and permanent strain.
The definition of in-plane scalar damage variables: d1, d2, d6 are given as: d1=1-E1E10d2=1-E2E20d6=1-G12G120 (15) Where E1, E2 and G12 are damaged elastic moduli of the material under mechanical loadings, and the superscript 0 denotes the elastic properties at initial state of the material.
Relationships between Hysteresis Measurements and the Constituent Properties of Ceramic Matrix Composites: I, Theory[J].
Relationships between Hysteresis Measurements and the Constituent Properties of Ceramic Matrix Composites: II, Experimental Studies on Unidirectional Materials[J].
Vagaggini and Domergue[4] developed a methodology to assess constituent properties of CMCs with relatively few hysteresis loop measurements, and investigated the influence factors of unload/reload hysteresis and permanent strain.
The definition of in-plane scalar damage variables: d1, d2, d6 are given as: d1=1-E1E10d2=1-E2E20d6=1-G12G120 (15) Where E1, E2 and G12 are damaged elastic moduli of the material under mechanical loadings, and the superscript 0 denotes the elastic properties at initial state of the material.
Relationships between Hysteresis Measurements and the Constituent Properties of Ceramic Matrix Composites: I, Theory[J].
Relationships between Hysteresis Measurements and the Constituent Properties of Ceramic Matrix Composites: II, Experimental Studies on Unidirectional Materials[J].
Online since: July 2023
Authors: Hao Hu, Ming Ming Chao, Xin Lai, Kari Ullakko
The selected wafers are single-crystal silicon, p-type, lightly doped, double-side, and mirror polished Si wafers with a diameter of 300 mm, which were manufactured subsequently using the same tool at each process step to ensure that no other interference factors affected the manufacturing process.
Therefore, it can be concluded from this investigation that the selected facet parameters and ESFQR are non-critical factors in near-edge LPD formation.
LPD affected areas lengths: (a) 106, (b) 130, (c) 173 µm, showing smaller absolute ZDD results in larger LPD affected radius.
Other factors such as wafer thickness may also be used in determining the contact point location when ZDD is between -954 nm/mm2 ∼ -1235 nm/mm2, that is, ZDD is no longer a decisive factor in this range, making surface LPD generation unpredictable.
Other factors such as wafer thickness may also impact LPD generation.
Therefore, it can be concluded from this investigation that the selected facet parameters and ESFQR are non-critical factors in near-edge LPD formation.
LPD affected areas lengths: (a) 106, (b) 130, (c) 173 µm, showing smaller absolute ZDD results in larger LPD affected radius.
Other factors such as wafer thickness may also be used in determining the contact point location when ZDD is between -954 nm/mm2 ∼ -1235 nm/mm2, that is, ZDD is no longer a decisive factor in this range, making surface LPD generation unpredictable.
Other factors such as wafer thickness may also impact LPD generation.
Online since: October 2014
Authors: Jing Wang, Yang Liu, Yu Tian
(1.2)
In this formula, A and B are the correction factors, Cair and nair are parameters of fatigue crack growth rate in dry air.
In order to obtain more accurate parameters, the factors in the fitting process should be in the same order of magnitude.
In this study, formula (1.4) is amended as follows: (1.6) The factors in formula (1.6) can be achieved by MATLAB : a1=1.8299;a2=0.0341;a3=-3.8563;a4=0.0007;a5=-0.3279;a6=3.948.
The dimensions of the CT specimen are shown in Figure 1: the material model is linear elastic material, and the mechanical properties are: elastic modulus E = 210GPa, Poisson's ratio υ = 0.3. 2.1.2 Model Meshing The quantities of sections are set on each edge, and the grids are divided.
In this paper, the influence of environmental concentrations, stress ratio, loading frequency and other factors on the crack growth rate are introduced by the computational model.
In order to obtain more accurate parameters, the factors in the fitting process should be in the same order of magnitude.
In this study, formula (1.4) is amended as follows: (1.6) The factors in formula (1.6) can be achieved by MATLAB : a1=1.8299;a2=0.0341;a3=-3.8563;a4=0.0007;a5=-0.3279;a6=3.948.
The dimensions of the CT specimen are shown in Figure 1: the material model is linear elastic material, and the mechanical properties are: elastic modulus E = 210GPa, Poisson's ratio υ = 0.3. 2.1.2 Model Meshing The quantities of sections are set on each edge, and the grids are divided.
In this paper, the influence of environmental concentrations, stress ratio, loading frequency and other factors on the crack growth rate are introduced by the computational model.
Online since: July 2019
Authors: Joko Suparno, Dimas Ardiansyah Halim, Ady Setiawan, Junaidi Junaidi, Marwan Effendy, J. Jamari
One factor affecting a machine’s life is friction between components resulting in wear in component surface.
In his research, Wang [5] states that rolling contact fatigue (RCF) of railway is an important factor affecting safety, maintenance, and service of rail track.
The friction occurring between wheel and railway affects rail performance and work system of its driving mechanism.
It indicates that the effectiveness of graphite splinters decreases, as graphite polishing decreases so that the number of graphite grains penetrating into the fissures of wheel specimen surface also decreases, thereby affecting the wheel’s wear level.
Hao, Tribological properties of solid lubricants (graphite, h-BN) for Cu-based P/M friction composites, Tribology International, 22 April (2008)
In his research, Wang [5] states that rolling contact fatigue (RCF) of railway is an important factor affecting safety, maintenance, and service of rail track.
The friction occurring between wheel and railway affects rail performance and work system of its driving mechanism.
It indicates that the effectiveness of graphite splinters decreases, as graphite polishing decreases so that the number of graphite grains penetrating into the fissures of wheel specimen surface also decreases, thereby affecting the wheel’s wear level.
Hao, Tribological properties of solid lubricants (graphite, h-BN) for Cu-based P/M friction composites, Tribology International, 22 April (2008)
Online since: July 2018
Authors: Teng Xu, Livan Fratini, Qin Xiang Xia, Hu Bo, Hong Chen Zhang
Surface quality of the upper strip directly affects the attractive appearance of the whole door.
Any minor defects of the exterior surface will result in the diffuse reflection of the light, thus affecting the appearance of the door[2].
Table 2 shows the mechanical properties of SP121BQ.
(2) where, W and K refer to the depth and factor of the punching wearing.
[8] Gang L, Lin J F, Gang W, et al, Influence of tube properties on quality of hydropiercing, Transactions of Nonferrous Metals Society of China, 21(2011), 456-460
Any minor defects of the exterior surface will result in the diffuse reflection of the light, thus affecting the appearance of the door[2].
Table 2 shows the mechanical properties of SP121BQ.
(2) where, W and K refer to the depth and factor of the punching wearing.
[8] Gang L, Lin J F, Gang W, et al, Influence of tube properties on quality of hydropiercing, Transactions of Nonferrous Metals Society of China, 21(2011), 456-460
Online since: December 2012
Authors: N.N. Hafizah, Mohamed Zahidi Musa, M. Rusop, Mohamad Hafiz Mamat
The TiO2 nanopowder obtained were characterized using X-ray diffraction (XRD), Raman spectroscopy and field emission scanning electron microscopy (FESEM) for their structural properties.
Cui et al prepared TiO2 in nanometer size by gas condensation method and studied its mechanical properties [6].
In this paper, TiO2 nanopowder was synthesized by sol gel grinding method and the effect of TiO2 precursor concentration on its structural properties were discussed.
The results obtained are agreed with the factor group analysis of anatase phase [22].
The FESEM micrographs show the precursor concentrations affect the surface morphology of TiO2 nanopowder where the higher concentration give highly aggregates with uneven particle shapes.
Cui et al prepared TiO2 in nanometer size by gas condensation method and studied its mechanical properties [6].
In this paper, TiO2 nanopowder was synthesized by sol gel grinding method and the effect of TiO2 precursor concentration on its structural properties were discussed.
The results obtained are agreed with the factor group analysis of anatase phase [22].
The FESEM micrographs show the precursor concentrations affect the surface morphology of TiO2 nanopowder where the higher concentration give highly aggregates with uneven particle shapes.
Online since: September 2013
Authors: Vlad Andrei Ciubotariu
The design of the front rail must take into consideration a number of characteristics such as: the general shape of the column (prismatic, circular, ellipsoid), the definition of the geometry (shape and dimensions of the cross section), properties and thickness of the material [2].
This desiderate created many problems linked to the implementation of new materials of which properties are still not completely known, conventional technologies sometimes failed and nowadays the environmental problems can be put into discussion.
However, any of the welding techniques cannot be conducted without heat input which determines a heat-affected zone and welding distortion.
In order to obtain the mechanical characteristics of the adhesive solution, a couple of preliminary tests were performed.
Mechanical properties of the materials Property SI Value M1 M2 TWB Yield strength MPa 177.77 230.43 245.57 Tensile strength MPa 410.95 418.48 432.88 Elastic modulus GPa 185.3 205.2 214.6 Strain hardening index - 0.231 0.161 0.157 Resistance coefficient - 518.05 528.19 541.86 Fig.1 Forming limit curve for the parent materials and TWB Fig.2 Shear and peel strength of the adhesive solution Nominal shear strength was found to be 30-35 MPa, whereas tensile peel strength is 17-20 MPa.
This desiderate created many problems linked to the implementation of new materials of which properties are still not completely known, conventional technologies sometimes failed and nowadays the environmental problems can be put into discussion.
However, any of the welding techniques cannot be conducted without heat input which determines a heat-affected zone and welding distortion.
In order to obtain the mechanical characteristics of the adhesive solution, a couple of preliminary tests were performed.
Mechanical properties of the materials Property SI Value M1 M2 TWB Yield strength MPa 177.77 230.43 245.57 Tensile strength MPa 410.95 418.48 432.88 Elastic modulus GPa 185.3 205.2 214.6 Strain hardening index - 0.231 0.161 0.157 Resistance coefficient - 518.05 528.19 541.86 Fig.1 Forming limit curve for the parent materials and TWB Fig.2 Shear and peel strength of the adhesive solution Nominal shear strength was found to be 30-35 MPa, whereas tensile peel strength is 17-20 MPa.
Online since: January 2005
Authors: M. Liu, X.B. Wang, J.B. Niu, F. Pan, D.M. Li
Microstructure and Electronic Properties of Al/Zr/LiNbO3 Multilayers
D.
This layered structure promoted better mechanical strength and suppressed Al migration.
Above results suggest that the degree of Al texture is strongly affected by the underlayer thickness and the highly textured Al films are obtained when the underlayer thickness is in a specific region.
Effects of Zr underlayer on the x-ray diffraction intensity of Al (111) peak. reported that a film with a smooth surface exhibits a high effective SAW coupling factor, while a rough surface will enlarge the insertion loss of SAW devices [17,18].
The Electrical Property of the Films.
This layered structure promoted better mechanical strength and suppressed Al migration.
Above results suggest that the degree of Al texture is strongly affected by the underlayer thickness and the highly textured Al films are obtained when the underlayer thickness is in a specific region.
Effects of Zr underlayer on the x-ray diffraction intensity of Al (111) peak. reported that a film with a smooth surface exhibits a high effective SAW coupling factor, while a rough surface will enlarge the insertion loss of SAW devices [17,18].
The Electrical Property of the Films.