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Online since: October 2024
Authors: Márton Schramkó, László Tóth, Ion Aurel Perianu, Tünde Anna Kovács
If joining them with each other the fusion welding process number is low.
The different melting points limit the applicable welding process number.
Test number Parameters 1 2 3 4 5 6 7 Pressure [PSI] 35 Welding time [s] 1 A friction amplitude [μm] 54 B friction amplitude [μm] 30 32 34 30 32 34 32 Amplitude step time [s] 0.5 0.5 0.5 0.35 0.35 0.35 0.15 Power [W] 2060 1940 1920 2580 2740 2620 - Maximum Tensile force [N] 451 422 426 609 658 635 - 3.
It seems from Table 2. that as a function of joint strengths, the best parameters for the USW earned from the number 5 test.
Nazarov: Ultrasonic Welding of Nickel with Coarse and Ultrafine Grained Structures.
Online since: October 2010
Authors: Cosme Roberto Moreira Silva, J.E. Rodriguez, C. Santos, R.A. Muñoz
The volume increase can also put existing crack into compression with fracture toughness enhancement, extending reliability and lifetime of stabilized zirconia Cations incorporation with small valence numbers such as the alkaline earth or stable rare earth cations (RE+ or Y3+) at pure zirconia can cause substitutional solid solution formation.
Controlled powder synthesis and ceramic processing can lead to higher densities and nonometric grain sizes.
Spectrum form at low wave number do not show peaks related to monoclinic zirconia (Fig 2 (a)).
Wave Features of ceramic powders obtained by Pechini Wave Number (cm-1) Functional Group. 3440 OH 2930 Ethyleneglicol (CH) 2350 CO 1630 Yttrium Oxide 586,462 Zr-OH2 Laser particle size analysis (Fig. 3) indicate that synthesized powder have narrow particle/agglomerate distribution, with medium size of 2.8117 μm.
Forms and position of bands of low wave numbers permits qualitative phases identification.
Online since: August 2013
Authors: Si Xiao Gao, Ai Lun Wang, Xue Peng Li
The relationship between total strain amplitude and the failure cycle number was well expressed by Manson-Coffin formula.
There are elastic and plastic deformation two parts in this equation: (2) Whereis total strain amplitude;is the elastic component of total strain amplitude; is the plastic component of total strain amplitude;is the coefficient of fatigue strength;is the coefficient of plastic fatigue;is the index of fatigue strength;is the index of plastic fatigue;is the number of cycles.
Calculation results are shown in Tab.1: Tab. 1 Fatigue calculation results of each node Node 170035 141617 170076 170075 Maximum stress value (Pa) 0.6545E9 0.4199E9 0.1687E9 0.15317E9 Cycles N 10000 10000 10000 10000 Stress amplitude 0.3273E9 0.166E9 0.7971E8 0.8293E8 Maximum allowable cycles 0.1E8 0.156E8 0.338E8 0.427E8 Tab.1 shows that stress amplitude is higher in the area of stress concentrations, and that allows the less number of cycles , the cumulative fatigue damage coefficient is greater as well.
(2) Stress amplitude is higher in the area of stress concentrations, and that allows the less number of cycles , the cumulative fatigue damage coefficient is greater as well.
[7] Wang Zhixing,Zhou Dian.Fine grain microstructure of hot die ring and the high cycle fatigue performance of GH4169
Online since: June 2012
Authors: Cheng Qiu Cai, Qing Song Guo, Xin Li
Table 2 Penetration height of each group proportion Number Admixture Water reducing agent Penetration height S1 JM- 33.8 S2 coal ash SP8 17.6 S3 slag powder SP8 14.5 S4 slag powder SP8 18.1 S5 slag powder SP1 16.2 2.2 Frost-resistance We test frost-resistance of the five specimens by slowly frozen method, freezethaw cycle for 300 times, then test the strength and mass loss rate.
Table 3 Result of resistance to freezing and thawing test of concrete Number Admixture Water reducing agent Mass loss rate Strength loss rate S1 JM- 0 3.5 S2 coal ash SP8 0.20 -2.1 S3 slag powder SP8 -0.19 7.8 S4 slag powder SP8 -0.29 5.1 S5 slag powder SP1 -0.30 1.3 From the table we can see that the strength of all in addition to S2 is declined, but strength loss is small.
Table 4 Result of attack test in the 10%sodium sulfate liquor number Strength soaked in water Strength soaked in sulfuric acid solution Strength loss rate S1 71.6 70.5 -1.5 S2 88.2 91.5 3.7 S3 91.3 95.0 4.0 S4 92.4 98.4 6.5 S5 92.6 96.3 4.7 Due to Table 4, the strength of specimens except S1 is unexpected increased.
It is not only because that the specimens are close-grained and impervious, but also they are mixed with coal ash and ground slag which are significant to resistance of sulfate eroding[4].
The changing process is shown in Fig.2 Table 5 Shrinkage rate in different curing age Number Shrinkage rate (μm/m) 1d 3d 7d 14d 28d 56d 90d S1 35.2 76.3 90.3 130.3 180.3 253.1 311.6 S2 97.6 143.6 183.5 230.5 290.6 370.6 410.5 S3 106.3 146.2 170.8 224.7 280.6 362.5 422.3 S4 101.4 146.9 190.4 234.1 274.5 330.8 370.6 S5 63.9 98.3 120.6 170.8 264.3 304.8 389.2 Fig.2 Shrinkage rate of the specimens in different curing age Conclusions From the test, we can see that S5 group is the optimal proportion.It has the feature of high strength and durability.This is mainly because coal ash and slag powder have been mixed into the specimens, and on the other hand, the polycarboxylate water reducer has some positive effect just as increasing anti-permeability and reducing the shrinkage crack.
Online since: August 2016
Authors: Jun-Ichi Matsushita, Tohru Sekino, Tsugio Sato, Shu Yin, Xiao Ling Wang, Jian Feng Yang, Xiao Yong Wu, Tomoyo Goto, Naoya Iwamoto, Tatsuki Satsukawa
Two titanium silicides such as TiSi2 (ICDD card number: 35-785) and Ti5Si3 (ICDD card number: 29-1362) are marketed in the world.
Among them, pentatitanium trisilicide, Ti5Si3 (Chemical Abstracts Service (CAS) registry number: 12067-57-1) has been shown to be potentially useful intermediate material.
The grain size of as-received powder was about 5 to 10 mm.
Acknowledgments This presentation was supported by the Cooperative Research Program of Network Joint Research Center for Materials & Devices, Japan by Tohoku University, Japan (Grant Number: 2015286 and 20164006).
Online since: March 2014
Authors: Dao Lun Chen, Jin He Liu, S.Q. Wang
The low thermal conductivity of titanium alloys causes superheating in the HAZ, increases the grain size and produces residual stresses in the HAZ, exerting a negative effect [7].
Fig. 5(a) and (b) show the evolution of cyclic stress amplitude as a function of the number of cycles at different strain amplitudes in the aging and STA conditions, respectively.
(b) (a) Fig. 5 Stress amplitude vs. the number of cycles at different total strain amplitudes in the (a) aging condition, and (b) STA condition.
Fig. 6 Total strain amplitude as a function of the number of cycles to failure in the aging and STA conditions.
Lindley, The effect of grain orientation on fracture morphology during high-cycle fatigue of Ti-6Al-4V, Acta Mater. 57 (2009) 3584-3595
Online since: September 2008
Authors: R.K. Pandey, H. Stern, W.J. Geerts, P. Padmini, P. Kale, Jian Dou, R. Schad
Of special interest is a recent publication dealing with the magnetic exchange bias of more than 1T observed in the grains of titanoheamatite (FeTiO3 bearing Fe2O3) mineral [1].
IH series were studied processing ceramic samples of a large number of compositions to understand their structural, magnetic and electrical properties [13, 21].
The grains are well developed and homogenous.
The process can be cycled infinite number of times and controlled switching can be programmed and predicted precisely.
We have provided a large number of references for the benefit of those who might be interested in studying this fascinating system.
Online since: April 2016
Authors: Y. Şahin, Senai Yalcinkaya
The effects of the speed, feed rate, depth of cut, grain size, number of passes and oil effect on the grinding of mostly mild steels and alloyed steels are studied [7-13].
There are numbers of studies on the grinding results of various materials mostly including carbon steels and alloyed steels, but a very limited work is carried out on plastic moulding steels by Taguchi method [5, 7, and 12].
Depth of cut was found more important, whereas the grinding speed, grain size, cutting fluid concentration and number of passes are insignificants when grinding heat treated AISI 4140 steel [7].
Online since: October 2011
Authors: Wan Shan Wang, Peng Guan, Ji Qiang Li, Shuang Zhu, Tian Biao Yu
Main Contents of Grinding Process Simulation As a complex physical process, grinding process is subject to a number of input factors and produces a variety of physical and mechanical phenomena.
Suto and Sata [2, 3] by measuring the number of effective abrasive and wear area to get the grinding wheel topography.
Hegeman [6] found the shape of abrasive grains was more closely resemble the shape of ellipsoid rather than spherical by SEM photographs.
The results show that the algorithm using coupled FEM and SPH can simulate the deformation of any material cutting layer, while avoiding a large number of SPH particle calculation of time-consuming.
Klocke given a model for single grain scratching on 1st European Conference on grinding in 2003, shown as in Fig.8.Yu Siyuan, Lin Bin and Han Xuesong [23, 24] studied a single crystal silicon ultra-precision grinding of molecular dynamics computer simulation.
Online since: July 2008
Authors: Ren Ke Kang, Zhu Ji Jin, Ze Wei Yuan, B.X. Dong
However, the columnar growth of CVD diamond results in a polycrystalline nature and the grain sizes increase with film thickness.
The 1.4cm-1 shift to a higher wave number indicates a compressive residual stress on the PCD specimen, because the Raman band of diamond moves to higher wave number shifts with increasing applied pressure. 400 600 800 1000 1200 1400 1600 1800 2000 2200 0 10000 20000 30000 40000 1333.4 Intensity (a.u.)
It was found that the original pyramidal crystallites diminished, numerous deepening pits overspread from the protuberant faces to the grain boundaries.
The 2.63cm-1 shift to a lower wave number indicated a tensile stress on the diamond. 1597.9cm -1 was characterized as graphite band.
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