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Online since: June 2010
Authors: Barry C. Muddle, Xiang Yuan Xiong, Stavroula Moutsos, Russell King
Introduction
The mechanical properties and microstructures of Al-Li-Mg-Cu alloys have been studied
extensively [1], due to the low density and high stiffness of alloys with the potential to replace
conventional aluminium alloys used in aircraft structures.
Understanding the microstructure and local composition distributions is important for optimizing the mechanical properties and designing new alloys.
The results in Figs. 4 and 5 show the effects of the two major factors that affect the measured compositions of alloys.
There are other factors that affect the measurement, such as the probing direction and evaporation rate.
Understanding the microstructure and local composition distributions is important for optimizing the mechanical properties and designing new alloys.
The results in Figs. 4 and 5 show the effects of the two major factors that affect the measured compositions of alloys.
There are other factors that affect the measurement, such as the probing direction and evaporation rate.
Online since: October 2010
Authors: Gui Cheng Wang, Chun Gen Shen, Shu Lin Wang, Wen Wu Nie, Gang Liu
At present, the research of high-speed machining tool technology focuses on the spindle/toolholder connection performance [2,3], the studies show that: the connection performance between spindle and toolholder is an important condition to ensure the high-speed cutting reliability, but we have not paid enough attention to the whole dynamic performance of tool system structure, especially the dynamic response caused by imbalances factors in HSM.
HSK63A toolholder was built based on the ISO12164-1 standard using the parametric method, their physical and mechanical properties were shown as follow in Table 1: Table 1 Material properties of HSK63A tool system components Appellation Material Density [Kg/m3] Young modulus [GPa] Poisson ratio Tensile strength limit [MPa] Yield strength [MPa] Tool holder 40CrNi2Mo 7.85 193 0.284 1240 1178 Cutting tool Cemented Carbide 19.3 400 0.28 980 750 We combined the toolholder and collect chunk as one part for reducing the computing scale with the finite element method, so we only need to establish finite element model of toolholder and cutting tool.
We have got the structural modal parameters of HSK63A tool system with the finite element method, but there are some factors which affect the calculation accuracy such as minutiae features neglected in modeling and the size of meshing.
At present, EMA has become the most important method of vibration analysis in the mechanical engineering.
Schmitz: 2004 ASME International Mechanical Engineering Congress November,(2004), pp. 13-19
HSK63A toolholder was built based on the ISO12164-1 standard using the parametric method, their physical and mechanical properties were shown as follow in Table 1: Table 1 Material properties of HSK63A tool system components Appellation Material Density [Kg/m3] Young modulus [GPa] Poisson ratio Tensile strength limit [MPa] Yield strength [MPa] Tool holder 40CrNi2Mo 7.85 193 0.284 1240 1178 Cutting tool Cemented Carbide 19.3 400 0.28 980 750 We combined the toolholder and collect chunk as one part for reducing the computing scale with the finite element method, so we only need to establish finite element model of toolholder and cutting tool.
We have got the structural modal parameters of HSK63A tool system with the finite element method, but there are some factors which affect the calculation accuracy such as minutiae features neglected in modeling and the size of meshing.
At present, EMA has become the most important method of vibration analysis in the mechanical engineering.
Schmitz: 2004 ASME International Mechanical Engineering Congress November,(2004), pp. 13-19
Online since: July 2018
Authors: Gençağa Pürçek, Harun Yanar, Muhammet Demirtas, Onur Saray
It was shown that superplastic elongation for such alloys depended on some microstructural properties including shape and size of the grains, phase composition and distribution of the phases in the microstructure.
These results suggest that the achieved elongation in superplastic materials is not only dependent on the grain size and there should be other factors affecting the superplastic elongation.
Besides the F/UFG microstructure, phase composition can also be proposed to be an important parameter affecting the achieved superplastic elongation.
Langdon, Mechanical characteristics of a Zn–22% Al alloy processed to very high strains by ECAP, Mater.
Song, mechanical properties and precipitate behavior of Mg–9Al–1Zn alloy processed by equal-channel angular pressing and aging, J.
These results suggest that the achieved elongation in superplastic materials is not only dependent on the grain size and there should be other factors affecting the superplastic elongation.
Besides the F/UFG microstructure, phase composition can also be proposed to be an important parameter affecting the achieved superplastic elongation.
Langdon, Mechanical characteristics of a Zn–22% Al alloy processed to very high strains by ECAP, Mater.
Song, mechanical properties and precipitate behavior of Mg–9Al–1Zn alloy processed by equal-channel angular pressing and aging, J.
Online since: July 2015
Authors: Wen Jin Meng, Yang Mu
Nix, Effects of the substrate on the determination of thin film mechanical properties by nanoindentation, Acta Mater. 50, 23-38 (2002).
].
Baldo, Inductively-coupled plasma assisted deposition and mechanical properties of metal-free and Ti-containing hydrocarbon coatings, J.
increases by more than a factor of two as h decrease from ~1180nm to ~550nm, exceeding 4.5GPa at h of ~550nm.
increases by about a factor of two as h decrease from ~1180nm to ~150nm, reaching ~0.8GPa at h of ~150nm.
We demonstrated a new experimental protocol for affecting and quantitatively measuring plasticity within thin metal films confined between and bonded to non-deforming, elastic-brittle materials in a micro-pillar geometry.
Baldo, Inductively-coupled plasma assisted deposition and mechanical properties of metal-free and Ti-containing hydrocarbon coatings, J.
increases by more than a factor of two as h decrease from ~1180nm to ~550nm, exceeding 4.5GPa at h of ~550nm.
increases by about a factor of two as h decrease from ~1180nm to ~150nm, reaching ~0.8GPa at h of ~150nm.
We demonstrated a new experimental protocol for affecting and quantitatively measuring plasticity within thin metal films confined between and bonded to non-deforming, elastic-brittle materials in a micro-pillar geometry.
Online since: April 2022
Authors: Maurice Schwicker, Nikolay Nikolov
Introduction
The tensile testing is an important method for determining the mechanical properties of plastics and other materials as well as for assessing the quality of some production technologies, such as injection molding and additive manufacturing (AM).
In [7] the mechanical properties of additively manufactured ABS components were investigated.
Of these factors, the authors themselves note, that gaps arise at the center of the specimen.
It is visible that with nozzle diameter of 1 mm, the path of the strands and the uneven contacts between interior and outline are factors that will cause stress concentrations.
Determination of tensile properties.
In [7] the mechanical properties of additively manufactured ABS components were investigated.
Of these factors, the authors themselves note, that gaps arise at the center of the specimen.
It is visible that with nozzle diameter of 1 mm, the path of the strands and the uneven contacts between interior and outline are factors that will cause stress concentrations.
Determination of tensile properties.
Online since: December 2023
Authors: Umapathi Durai, P. Thejasree, Natarajan Manikandan, Duraiswamy Palanisamy
Introduction
Due to their exceptional properties, superalloys find widespread application in the nuclear reactor and aerospace industries.
Pulse duration (on/off), applied current are the independent factors.
The optimal amalgamation of factors for accomplishing increased MRR is determined to be A3B3C3.
It is noticed that the increase of factors consequences in increase of ‘SR’.
Surface Topography: Metrology and Properties 10, no. 2 (2022): 025014
Pulse duration (on/off), applied current are the independent factors.
The optimal amalgamation of factors for accomplishing increased MRR is determined to be A3B3C3.
It is noticed that the increase of factors consequences in increase of ‘SR’.
Surface Topography: Metrology and Properties 10, no. 2 (2022): 025014
Online since: July 2022
Authors: Joana Rebelo-Kornmeier, Maximilian Gruber, Wolfram Volk, Simon Vitzthum, Michael Hofmann
Within this study factors influencing the specimen temperature during tensile loading and unloading are experimentally analyzed to improve the determination approach and the understanding of it.
The extent to which the temperature behavior really reflects the material behavior must be investigated in detail in order to exclude the possibility that external factors such as the measurement technique or the laboratory conditions influence the result.
The main mechanical material properties are summarized in Table 1.
Table 1: Main mechanical properties of the considered materials.
However, the evaluation range for YS0 is not affected, so that this also has no influence on the parameter.
The extent to which the temperature behavior really reflects the material behavior must be investigated in detail in order to exclude the possibility that external factors such as the measurement technique or the laboratory conditions influence the result.
The main mechanical material properties are summarized in Table 1.
Table 1: Main mechanical properties of the considered materials.
However, the evaluation range for YS0 is not affected, so that this also has no influence on the parameter.
Online since: October 2010
Authors: Xiao Bao Lei, Han Dong Zhou, Zhen Ning Liu
It was researched that how dust diameter, moisture content and temperature affected the specific resistance.
Table 1 Test-bed measurements reproducible test Temperature(°C) The first data ρ(Ω·cm) The second data ρ(Ω·cm) Relative deviation(%) 10 5.2×1011 4.9×1011 0.058 20 0.98×1012 1.01×1012 -0.031 30 1.04×1012 1.12×1012 -0.077 40 8.3×1012 7.8×1012 0.06 As can be seen from the above data, the test has good data reproducibility Refer to national standard for test methods of dust properties in Part X(GB/T16913.10-1997)[13,14,18], drying the dust samples at the temperature of 105°C for 4h.
Working receptivity is affected by many factors such as temperature, humidity, and the ingredients of dust and so on.
To determine whether the ESP could deal with such dust, many factors that can affect the receptivity should be considered.
The results of study also shown that the particle size of dust have little impact on measured receptivity, temperature and humidity are important factors what affect the wood dust more, and these two factors have interrelated impact on the receptivity of dust.
Table 1 Test-bed measurements reproducible test Temperature(°C) The first data ρ(Ω·cm) The second data ρ(Ω·cm) Relative deviation(%) 10 5.2×1011 4.9×1011 0.058 20 0.98×1012 1.01×1012 -0.031 30 1.04×1012 1.12×1012 -0.077 40 8.3×1012 7.8×1012 0.06 As can be seen from the above data, the test has good data reproducibility Refer to national standard for test methods of dust properties in Part X(GB/T16913.10-1997)[13,14,18], drying the dust samples at the temperature of 105°C for 4h.
Working receptivity is affected by many factors such as temperature, humidity, and the ingredients of dust and so on.
To determine whether the ESP could deal with such dust, many factors that can affect the receptivity should be considered.
The results of study also shown that the particle size of dust have little impact on measured receptivity, temperature and humidity are important factors what affect the wood dust more, and these two factors have interrelated impact on the receptivity of dust.
Online since: November 2012
Authors: Zheng Huan Hu, Kang Sheng Zhang, Cui Ping Yang
The area changes of the minute central cavities were obtained, and combined with the internal stress state during the rolling process, the viewpoint that tensile stress in the three-dimensional directions is one factor that leads to cavity growth was expound.
Introduction Central cavity is one of the main defects in the workpiece of cross wedge rolling, which significantly weaken the mechanical properties of products.
Tensile stress in the all three-dimensional directions is one major factor that makes central cavity expand.
Conclusions Three-dimensional finite element models were established to simulate cross wedge rolling parts with a minute central cavity, the development of cavity is gotten and the reasons of cavity expansion was expounded by analyzing changes of the stress state , conclusions are as the following: (1) Tensile stress is one of the main factors leading to central cavity expansion, the higher the value of tensile stress, the longer the duration, the bigger cavity expansion
(2) Area reduction is a main factor that affects the development of the cavity. 30% area reduction is a turning point to expand or shrink cavity under the rolling condition in this paper
Introduction Central cavity is one of the main defects in the workpiece of cross wedge rolling, which significantly weaken the mechanical properties of products.
Tensile stress in the all three-dimensional directions is one major factor that makes central cavity expand.
Conclusions Three-dimensional finite element models were established to simulate cross wedge rolling parts with a minute central cavity, the development of cavity is gotten and the reasons of cavity expansion was expounded by analyzing changes of the stress state , conclusions are as the following: (1) Tensile stress is one of the main factors leading to central cavity expansion, the higher the value of tensile stress, the longer the duration, the bigger cavity expansion
(2) Area reduction is a main factor that affects the development of the cavity. 30% area reduction is a turning point to expand or shrink cavity under the rolling condition in this paper
Online since: December 2015
Authors: W.O. Soboyejo, M.G. Zebaze Kana, V.C. Anye, W.O. Akande
The barrier and conformal properties were achieved by using the inherent mechanical flexibility and hydrophobic properties of PDMS [19, 20].
The mode mixity is a function of the stress intensity factors, KI and KII, and, which is a material property parameter given in [24].
These techniques bear the potential for engineering barrier properties by utilizing the permeability of polymers in a positive way.
Bergveld, The mechanical properties of the rubber elastic polymer polydimethylsiloxane for sensor applications, J.
Soboyejo, Mechanical Properties of Engineered Materials, Marcel Dekker Inc., New York, NY, 2003
The mode mixity is a function of the stress intensity factors, KI and KII, and, which is a material property parameter given in [24].
These techniques bear the potential for engineering barrier properties by utilizing the permeability of polymers in a positive way.
Bergveld, The mechanical properties of the rubber elastic polymer polydimethylsiloxane for sensor applications, J.
Soboyejo, Mechanical Properties of Engineered Materials, Marcel Dekker Inc., New York, NY, 2003