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Online since: March 2013
Authors: Chun Xian Jiang, Xiao Han, Ji Hong Wang
Fig. 1 Model for analysis of slope stability
Selection of parameters in shear resistance
Gangue formed with large grain sizes, high coarse grained content and poor gradation, is different from normal soil.
Table.3 Result of orthogonal test test number Factor and level Evaluation index density γ/[kN·m³] cohesion c/[kPa] angle of friction φ/[°] angle of slope α/[°] safety coefficient Fs 1 10.55 5.5 37 28 1.519 2 10.55 11 47 33 1.621 3 10.55 16.5 57 38 1.695 4 21.10 5.5 47 38 1.224 5 21.10 11 57 28 1.574 6 21.10 16.5 37 33 1.223 7 31.65 5.5 57 33 1.417 8 31.65 11 37 38 1.043 9 31.65 16.5 47 28 1.343 Table.4 Range analysis of each parameter parameter density γ/[kN·m³] cohesion c/[kPa] angle of friction φ/[°] angle of slope α/[°] K1j 4.835 4.160 3.785 4.436 K2j 4.021 4.238 4.188 4.261 K3j 3.803 4.261 4.686 3.962 Rj 1.032 0.101 0.901 0.474 sensibility density > angle of friction > angle of slope > cohesion Conclusions Force-displacement curve obtained from the push-shear test of granular gangue presented the characteristics of complete stress-strain curve, which caused obvious strain softing.
Table.3 Result of orthogonal test test number Factor and level Evaluation index density γ/[kN·m³] cohesion c/[kPa] angle of friction φ/[°] angle of slope α/[°] safety coefficient Fs 1 10.55 5.5 37 28 1.519 2 10.55 11 47 33 1.621 3 10.55 16.5 57 38 1.695 4 21.10 5.5 47 38 1.224 5 21.10 11 57 28 1.574 6 21.10 16.5 37 33 1.223 7 31.65 5.5 57 33 1.417 8 31.65 11 37 38 1.043 9 31.65 16.5 47 28 1.343 Table.4 Range analysis of each parameter parameter density γ/[kN·m³] cohesion c/[kPa] angle of friction φ/[°] angle of slope α/[°] K1j 4.835 4.160 3.785 4.436 K2j 4.021 4.238 4.188 4.261 K3j 3.803 4.261 4.686 3.962 Rj 1.032 0.101 0.901 0.474 sensibility density > angle of friction > angle of slope > cohesion Conclusions Force-displacement curve obtained from the push-shear test of granular gangue presented the characteristics of complete stress-strain curve, which caused obvious strain softing.
Online since: January 2014
Authors: An Guo Huang, Shu Hui Hu, Ge Yang, Yuan Liu
The difference between transition layer and heat affected zone of the sample F-J looked relatively small, although F-Y’s grain was coarsening in the heat-affected zone.
The grains staggered distributed at the frontier, which was different from the strip structure along the rolling direction of base metal.
XRD results also collected a large number of substrate information such as Al3V, TiO2, Ti and Ti8.86V1.14, etc.
The grains staggered distributed at the frontier, which was different from the strip structure along the rolling direction of base metal.
XRD results also collected a large number of substrate information such as Al3V, TiO2, Ti and Ti8.86V1.14, etc.
Online since: May 2020
Authors: Rif G. Rizvanov, Ayrat Minnulovich Faнrushin, Marat R. Fatkullin
However, this method has a number of significant drawbacks, since the high-temperature energy source and the different deformation capacity of the parts are the cause of considerable post-welding stresses.
A significant disadvantage of this technology, in our opinion, is the preservation of a relatively wide HAZ, which includes an overheating section with large grain structure with low toughness.
We used these technologies because: - the use of forced cooling during welding allows us to increase the cooling rate, and we are able to significantly reduce the grain size, reduce the HAZ and increase the strength characteristics of the welded joint and its toughness; - ultrasonic shock oscillations have a complex effect on the welded joint, reducing stress load concentrations in the welded joint, creating a reinforcing layer on the surface being treated with increased resistance to cracking, etc.
A significant disadvantage of this technology, in our opinion, is the preservation of a relatively wide HAZ, which includes an overheating section with large grain structure with low toughness.
We used these technologies because: - the use of forced cooling during welding allows us to increase the cooling rate, and we are able to significantly reduce the grain size, reduce the HAZ and increase the strength characteristics of the welded joint and its toughness; - ultrasonic shock oscillations have a complex effect on the welded joint, reducing stress load concentrations in the welded joint, creating a reinforcing layer on the surface being treated with increased resistance to cracking, etc.
Online since: January 2022
Authors: Ahmad Zahirani Ahmad Azhar, Norhashimah Mohd Shaffiar, Siti Asmahani Saad, Md Yusof Ismail
Introduction
Concrete is classified as a composite material since it is composed of a number of aggregates, water, and other admixtures such as metal that serve as reinforcement for the concrete.
Despite their irregular grain sizes, grains are easily evident in all of the samples' microstructures, this observation is similar to the previous research done [9-11].
Despite their irregular grain sizes, grains are easily evident in all of the samples' microstructures, this observation is similar to the previous research done [9-11].
Online since: April 2022
Authors: Shinichi Nishida, Toshio Haga, Hisaki Watari, Asuto Kozai
One method dealing with the effects of Fe impurities is to make an intermetallic compound with fine grains of Fe compounds via rapid solidification.
After Fe addition, the grain size became fine.
The size and number of Fe-containing intermetallic compounds increased.
After Fe addition, the grain size became fine.
The size and number of Fe-containing intermetallic compounds increased.
Online since: July 2015
Authors: Nikolai S. Perov, A.M. Tishin, T.M. Elkhova, A.K. Yakushechkina, A.S. Semisalova, K.I. Kamilov, Yurii K. Gun’ko, Yu.I. Spichkin, A.P. Pyatakov
Nowadays magnetic nanoparticles (MNps) are used in increasing number of applications including biomedical ones due to the possibility of MNps injection and accumulation in the target tissue [1].
Size of grains is varying in a wide range from 5 nm for the sample with 60% of Zn up to 25 nm for 20% Zn sample (Fig. 1).
As the result, all the samples showed predicted spinel structure with characteristic grain size 6.5 nm that is in the confinement with TEM measurements.
Size of grains is varying in a wide range from 5 nm for the sample with 60% of Zn up to 25 nm for 20% Zn sample (Fig. 1).
As the result, all the samples showed predicted spinel structure with characteristic grain size 6.5 nm that is in the confinement with TEM measurements.
Online since: January 2013
Authors: Hong Qi Yuan, Ying Hua Yu, Zi Xue Guo
The granularity of mid-fan become smaller compared with fan root, the lithology is mainly characterized by gritstone and grained sandstone, the amplitude of the electric curves become lower.
Fanlike sand body is accumulated in the deep lake area by a great number of debris which is carried by turbidity current of sublacustrine fan system, its shape commonly like huge lensing in the dark mudstone[10].It mainly developed in retrogradation sequence sets (Sq2,Sq3) of fault depression super sequence, formed a setting of grey black mud shale of a semi-deep lake, represented a set of anti-size grading sandtone sedimentation ,containing the debris of land sources transported by the gravity flow and rapid accumulation.
The lithology of fan delta can make a transition from grained sandstone to mudstone.
Fanlike sand body is accumulated in the deep lake area by a great number of debris which is carried by turbidity current of sublacustrine fan system, its shape commonly like huge lensing in the dark mudstone[10].It mainly developed in retrogradation sequence sets (Sq2,Sq3) of fault depression super sequence, formed a setting of grey black mud shale of a semi-deep lake, represented a set of anti-size grading sandtone sedimentation ,containing the debris of land sources transported by the gravity flow and rapid accumulation.
The lithology of fan delta can make a transition from grained sandstone to mudstone.
Online since: July 2011
Authors: Ming Hu
Farmland mainly upland and irrigable land is given priority to maize, millet, buckwheat Kessler such as grains, beans.
Garden is the objectives of the land type change in the important factors, garden number of increase farmer's income.
Combine the tab.2, we can see the Ansai forest land, grassland, garden increase in the number of more apparent, first woodland and grassland mainly by increasing number of the country "converting cropland to forest and grassland" policy influence, a lot of slope farmland, and by the increase in the number of garden, primarily because after farmland.
Garden is the objectives of the land type change in the important factors, garden number of increase farmer's income.
Combine the tab.2, we can see the Ansai forest land, grassland, garden increase in the number of more apparent, first woodland and grassland mainly by increasing number of the country "converting cropland to forest and grassland" policy influence, a lot of slope farmland, and by the increase in the number of garden, primarily because after farmland.
Online since: March 2014
Authors: Yong Jie Liu, Rui Dong Wang, Shi Ming Cui, Xiang You, Qingyuan Wang
Before test, all the specimens were first mechanically polished using sandpaper from grade 600 to grade 2000 in sequence and then further polished with diamond suspensions (minimum grain size 7μm).
Fig.4 shows variation of stress amplitude during testing process, and the horizontal ordinate is the ratio of cyclic number () to fatigue life ().
It can be seen that, after a few loading cycles, the stress amplitude is relatively stable, therefore, the hysteresis loop at the number of half fatigue life can be defined as the stabilized one and used to evaluate the cyclic stress-strain relationship.
The stabilized stress amplitude at the number of half fatigue life was used to calculate the elastic strain amplitude.
According to the Coffin-Manson relationship[6,7], which is expressed as: , , (2) Where =total strain amplitude, =elastic strain amplitude, =plastic strain amplitude, =fatigue strength coefficient, =fatigue strength exponent,=fatigue ductility coefficient, =fatigue ductility exponent, = number of reversals to failure.
Fig.4 shows variation of stress amplitude during testing process, and the horizontal ordinate is the ratio of cyclic number () to fatigue life ().
It can be seen that, after a few loading cycles, the stress amplitude is relatively stable, therefore, the hysteresis loop at the number of half fatigue life can be defined as the stabilized one and used to evaluate the cyclic stress-strain relationship.
The stabilized stress amplitude at the number of half fatigue life was used to calculate the elastic strain amplitude.
According to the Coffin-Manson relationship[6,7], which is expressed as: , , (2) Where =total strain amplitude, =elastic strain amplitude, =plastic strain amplitude, =fatigue strength coefficient, =fatigue strength exponent,=fatigue ductility coefficient, =fatigue ductility exponent, = number of reversals to failure.
Online since: November 2010
Authors: Naoaki Noda, Yasushi Takase, Hisataka Takada
The total number of elements is 60450, and total number of nodes is 77868.
References [1] Kaido, C: Spiral Core made of Grain-oriented Electrical Steel Sheet, IEEJ Transactions on Industry Applications, Vol. 116, No. 3 (1996), pp. 265-270 [2] Abb research ltd.: Method of forming motor, Japan patent (in Japanese), 2004-505595 [3] Kumai, S., and Yaskawa electric corp : Winding accumulating core of motor, Japan patent (in Japanese), s51-40506 [4] Kikuchi, Y., Fukuda, Y., Maeyama, K., and Fujitsu general ltd.
:Motor, Japan patent, 2005-160170 [5] Sakanishi, S., Asai, T., Koyama, M., and Kuroda precision ind. ltd., Mitsuba electric mfg. co. ltd. : Method and device for manufacturing winding stator core, Japan patent, h2-106151 [6] Mizutani, K., and Toshiba corp.: Manufacture of annular core, Japan patent, h1-264548 (a) V2=40 % in Eq.(2) Slit of 1st layer Slit of 2nd layer (c) (b Slit Fig.9 Unit cell of two layer's model (a) Two layers model (b) Positions of silts (c) Approximation method block2 block1 block1 Table1 Effect of number of slit Ns on *E ( Ns:Effect of number of slit of one layer) 128 158 179 187 196 115 148 172 182 192 90.4 126 157 170 186 85.6 120 149 163 178 113 146 171 181 193 106 138 163 176 187 12 6 3 2 1 ROM FEM ROM FEM ROM FEM D=284[mm],t=16[mm] D=142[mm],t=32[mm] D=142[mm],t=16[mm] Effective Young's modulus [GPa] 128 158 179 187 196 115 148 172 182 192 90.4 126
References [1] Kaido, C: Spiral Core made of Grain-oriented Electrical Steel Sheet, IEEJ Transactions on Industry Applications, Vol. 116, No. 3 (1996), pp. 265-270 [2] Abb research ltd.: Method of forming motor, Japan patent (in Japanese), 2004-505595 [3] Kumai, S., and Yaskawa electric corp : Winding accumulating core of motor, Japan patent (in Japanese), s51-40506 [4] Kikuchi, Y., Fukuda, Y., Maeyama, K., and Fujitsu general ltd.
:Motor, Japan patent, 2005-160170 [5] Sakanishi, S., Asai, T., Koyama, M., and Kuroda precision ind. ltd., Mitsuba electric mfg. co. ltd. : Method and device for manufacturing winding stator core, Japan patent, h2-106151 [6] Mizutani, K., and Toshiba corp.: Manufacture of annular core, Japan patent, h1-264548 (a) V2=40 % in Eq.(2) Slit of 1st layer Slit of 2nd layer (c) (b Slit Fig.9 Unit cell of two layer's model (a) Two layers model (b) Positions of silts (c) Approximation method block2 block1 block1 Table1 Effect of number of slit Ns on *E ( Ns:Effect of number of slit of one layer) 128 158 179 187 196 115 148 172 182 192 90.4 126 157 170 186 85.6 120 149 163 178 113 146 171 181 193 106 138 163 176 187 12 6 3 2 1 ROM FEM ROM FEM ROM FEM D=284[mm],t=16[mm] D=142[mm],t=32[mm] D=142[mm],t=16[mm] Effective Young's modulus [GPa] 128 158 179 187 196 115 148 172 182 192 90.4 126