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On the fatigue performance of Aluminum alloy 2024 scarfed lap joints
Yan, W.Z.,Gao, H.S.,Yuan, X.,Wang, F.S.,Yue, Z.F. Techno-Press 2012 Structural Engineering and Mechanics, An Int'l Jou Vol.44 No.1
A series of fatigue test were carried out on scarfed lap joints (SLJ) using in airfoil siding to explore the effect of structural details, such as rows of rivets, lap angles, on its fatigue performance. Finite element (FE) analysis was employed to explore the effect of lap angle on load transfer and the stress evolution around the rivet hole. At last, the fatigue lives were predicted by nominal stress approach and critical plane approach. Both of the test results and predicted results showed that fatigue life of SLJ was remarkably increased after introducing lap angle into the faying surface. Specimen with the lap angle of $1.68^{\circ}$ exhibits the best fatigue performance in the present study.
Response of plasma rotation to resonant magnetic perturbations in J-TEXT tokamak
Yan, W,Chen, Z Y,Huang, D W,Hu, Q M,Shi, Y J,Ding, Y H,Cheng, Z F,Yang, Z J,Pan, X M,Lee, S G,Tong, R H,Wei, Y N,Dong, Y B IOP 2018 Plasma physics and controlled fusion Vol.60 No.3
<P>The response of plasma toroidal rotation to the external resonant magnetic perturbations (RMP) has been investigated in Joint Texas Experimental Tokamak (J-TEXT) ohmic heating plasmas. For the J-TEXT’s plasmas without the application of RMP, the core toroidal rotation is in the counter-current direction while the edge rotation is near zero or slightly in the co-current direction. Both static RMP experiments and rotating RMP experiments have been applied to investigate the plasma toroidal rotation. The core toroidal rotation decreases to lower level with static RMP. At the same time, the edge rotation can spin to more than 20 km s<SUP>−1</SUP> in co-current direction. On the other hand, the core plasma rotation can be slowed down or be accelerated with the rotating RMP. When the rotating RMP frequency is higher than mode frequency, the plasma rotation can be accelerated to the rotating RMP frequency. The plasma confinement is improved with high frequency rotating RMP. The plasma rotation is decelerated to the rotating RMP frequency when the rotating RMP frequency is lower than the mode frequency. The plasma confinement also degrades with low frequency rotating RMP.</P>
Yan, Z. 대한전기학회 1996 전기의 세계 Vol.45 No.4
1949년 이후, 중국에서의 전력사업은 급속히 증가하였으며, 1949년부터 1994년까지의 에너지 생산의 연평균성장률과 기존에 장치용량은 각각 12.68%와 10.97%이다. 하지만 중국의 많은 인구와 발전중인 산업의 엄청난 수요로 인하여 전기에너지의 부족은 여전히 중국의 가장 심각한 문제이다. 그래서, 서부에서 동부로 전력에너지를 전송하기 위해서도 더욱더 고압의 AC와 DC 전송 system 채택이 적절하다. 최근까지는 많은 500kV AC 계통과 하나의 .+-.500kV DC link를 운영하였다. 다른 한편으로는, 설치된 전력기기의 안전운전을 어떻게 보장 할 것인가가 또 다른 중요한 문제이다. 그러므로, 절연진단이 온 나라이 전력설비에 더 많은 관심이 기울어지고 있다.
On the fatigue performance of Aluminum alloy 2024 scarfed lap joints
W.Z. Yan,H.S. Gao,X. Yuan,F.S. Wang,Z.F. Yue 국제구조공학회 2012 Structural Engineering and Mechanics, An Int'l Jou Vol.44 No.1
A series of fatigue test were carried out on scarfed lap joints (SLJ) using in airfoil siding to explore the effect of structural details, such as rows of rivets, lap angles, on its fatigue performance. Finite element (FE) analysis was employed to explore the effect of lap angle on load transfer and the stress evolution around the rivet hole. At last, the fatigue lives were predicted by nominal stress approach and critical plane approach. Both of the test results and predicted results showed that fatigue life of SLJ was remarkably increased after introducing lap angle into the faying surface. Specimen with the lap angle of 1.68o exhibits the best fatigue performance in the present study.
Sintering behavior of Y-doped ZrO₂ ceramics: the effect of additive rare earth oxides
G. Yan,H. Hui,Z. Yuan Li,L. Ying,Z. Fu Qiang 한양대학교 세라믹연구소 2008 Journal of Ceramic Processing Research Vol.9 No.3
Rare earth element as colorants have been used in industry for many years. In this study, tooth-like dental ceramic has been prepared by adding rare earth oxides as colorants to nano 3Y-TZP. And the effect of Pr6O11 and CeO2 additions as dopants in yttria-stabilized tetragonal zirconia polycrystals (Y-TZP) on the sintering densification, microstructure and transformation behavior of the composites was examined. The experimental results are discussed in terms of defect chemistry by aliovalent cation substitutions. It is found that a small amount of Pr6O11 and CeO2 additions has no significant effects on the material sintering properties, and by this means it is possible that bioceramics with a color similar to natural dentine could be developed. Rare earth element as colorants have been used in industry for many years. In this study, tooth-like dental ceramic has been prepared by adding rare earth oxides as colorants to nano 3Y-TZP. And the effect of Pr6O11 and CeO2 additions as dopants in yttria-stabilized tetragonal zirconia polycrystals (Y-TZP) on the sintering densification, microstructure and transformation behavior of the composites was examined. The experimental results are discussed in terms of defect chemistry by aliovalent cation substitutions. It is found that a small amount of Pr6O11 and CeO2 additions has no significant effects on the material sintering properties, and by this means it is possible that bioceramics with a color similar to natural dentine could be developed.
Hysteresis Loops, Critical Fields and Energy Products for Exchange-spring Hard/soft/hard Trilayers
B. Z. Chen,S. Yan,Y. Z. Ju,G. P. Zhao,X. C. Zhang,M. Yue,J. Xia 한국자기학회 2015 Journal of Magnetics Vol.20 No.1
Macroscopic hysteresis loops and microscopic magnetic moment distributions have been determined by a three-dimensional (3D) model for exchange-coupled Sm-Co/α-Fe/Sm-Co trilayers with in-plane collinear easy axes. These results are carefully compared with the popular one-dimensional (1D) micromagnetic models and recent experimental data. It is found that the results obtained from the two methods match very well, especially for the remanence and coercivity, justifying the calculations. Both nucleation and coercive fields decrease monotonically as the soft layer thickness L<SUP>s</SUP> increases while the largest maximum energy product (roughly 50 MGOe) occurs when the thicknesses of hard and soft layers are 5 ㎚ and 15 ㎚, respectively. Moreover, the calculated angular distributions in the thickness direction for the magnetic moments are similar. Nevertheless, the calculated nucleation and pinning fields as well as the energy products by 3D OOMMF are systematically smaller than those given by the 1D model, due mainly to the stray fields at the corners of the films. These demagnetization fields help the magnetic moments at the corners to deviate from the previous saturation state and facilitate the nucleation. Such an effect enhances as Ls increases. When the thicknesses of hard and soft layers are 10 ㎚ and 20 ㎚, respectively, the pinning field difference is as large as 30%, while the nucleation fields have opposite signs.
Y. Yuan,Z. H. Zhong,Z.S. Yu,H. F. Yin,Y. Y. Dang,X. B. Zhao,Z. Yang,J. T. Lu,J. B. Yan,Y. Gu 대한금속·재료학회 2015 METALS AND MATERIALS International Vol.21 No.4
A new Ni-Fe-based superalloy, HT-X, has been developed for applications in 700 °C advanced ultra-supercritical (A-USC) boilers. The HT-X alloy is subjected to various heat treatments. Tensile tests are conducted at room temperature (RT), 700 °C and 750 °C. Creep tests are carried out under conditions of 700 °C/300 MPa and 750 °C/150 MPa. After aging treatment, the yield strength of the HT-X alloy at RT and 750 °C is 787 MPa and 624 MPa, respectively. When additional thermal exposure at 750 °C for 5400 h is applied, the yield strength is decreased to 656 MPa at RT and 480 MPa at 700 °C. For an aged specimen, the a/2<110> dislocation shearing process occurs when tensile testing is conducted at RT and 750 °C. As the γ' precipitate size increases in the specimen that is thermally exposed at 750 °C for 5400 h, Orowan bowing is the dominant dislocation process, and stacking faults develop in the γ' precipitates at both RT and 700 °C. Dislocation slip combined with climb is the dominant mechanism under the creep testing conditions. The factors that affect the mechanical properties and deformation mechanisms are discussed.