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Journal articles on the topic 'Wedge coupling'

Author: Grafiati
Published: 26 June 2021
Last updated: 3 February 2022

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1

Yang, Che Hua, and Chun Zen Tsen. "Dispersion Behaviors of Wedge Waves Propagating Along Wedges with Bilinear Cross Sections." Key Engineering Materials 321-323 (October 2006): 765–69. http://dx.doi.org/10.4028/www.scientific.net/kem.321-323.765.

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Wedge waves (WW) are guided acoustic waves propagating along the tip of a wedge, with energy tightly confined near the apex. Like Lamb waves, wedge waves with displacement field anti-symmetric about the mid-apex-plane are called anti-symmetric flexural (ASF) modes. This study is focused on exploring the dispersion behaviors of ASF modes propagating along a bilinear wedge (BW). A BW is wedge with a cross section of two apex angles, compared with a linear wedge (LW) having a single apex angle. In the literature, many studies regarding to the dispersion behaviors of ASF modes are reported for LW, but not for BW. In this study, a laser ultrasonic technique and finite element simulations are used to investigate the dispersion behavior of BW-ASF modes. It is found out that a BW-ASF mode is a result of mode coupling between the two LW-ASF modes of the same order corresponding to the two apex angles of the BW.
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2

Li, Qingdang, Shuaishuai Li, and Yu Wang. "Rigid-Flexible Coupling Dynamics Simulation of Wedge Press." IOP Conference Series: Earth and Environmental Science 558 (September 5, 2020): 032004. http://dx.doi.org/10.1088/1755-1315/558/3/032004.

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3

Ping, Xue Cheng, Lin Leng, and Si Hai Wu. "Thermo-Mechanical Stress near Apex of a Bi-Material Wedge by a Novel Finite Element Analysis." Key Engineering Materials 525-526 (November 2012): 93–96. http://dx.doi.org/10.4028/www.scientific.net/kem.525-526.93.

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A super wedge tip element for application to a bi-material wedge is develop utilizing the thermo-mechanical stress and displacement field solutions in which the singular parts are numerical solutions. Singular stresses near apex of an arbitrary bi-material wedge under mechanical and thermal loading can be obtained from the coupling between the super wedge tip element and conventional finite elements. The validity of this novel finite element method is established through existing asymptotic solutions and conventional detailed finite element analysis.
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4

KAWAHASHI, Masaaki, Kenji HOSOI, Eric BROCHER, and Paul COLLINII. "Visualization of vortex-shedding from wedge coupling with resonator." JOURNAL OF THE FLOW VISUALIZATION SOCIETY OF JAPAN 7, no. 26 (1987): 243–46. http://dx.doi.org/10.3154/jvs1981.7.243.

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5

Sharkov, O. V., S. I. Koryagin, and N. L. Velikanov. "Effect of wedge coupling in smooth cylindrical surfaces contact." IOP Conference Series: Earth and Environmental Science 194 (November 15, 2018): 022034. http://dx.doi.org/10.1088/1755-1315/194/2/022034.

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6

Bo, Fang, Steven He Huang, Şahin Kaya Özdemir, Guoquan Zhang, Jingjun Xu, and Lan Yang. "Inverted-wedge silica resonators for controlled and stable coupling." Optics Letters 39, no. 7 (March 21, 2014): 1841. http://dx.doi.org/10.1364/ol.39.001841.

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7

Wang, Guilian, Yong Wang, Bingrui Lv, Ruopeng Ma, and Li Liu. "Research on a New Type of Rigid-Flexible Coupling 3-DOF Micro-Positioning Platform." Micromachines 11, no. 11 (November 18, 2020): 1015. http://dx.doi.org/10.3390/mi11111015.

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A new type of rigid-flexible coupling three degrees of freedom (3-DOF) micro-positioning platform with high positioning accuracy and high bearing capacity is developed, which consists of flexible drive mechanism and rigid platform. The flexible drive mechanism consists of three sets of symmetrical parallel round flexible hinge structures, each with a wedge structure in the middle of the symmetrical parallel flexible hinge. The rigid platform has an inclined plane with the same angle as the wedge, while the wedge structure is used to achieve the self-locking effect. The flexibility matrix method and ANSYS are used to analyze the statics of the flexible drive mechanism. The first four natural frequencies of the platform are obtained by dynamic simulation analysis. A symmetrical rigid flexible coupling micro-positioning platform experimental system is developed. Output characteristics, positioning accuracy, relationship between frequency and amplitude, and bearing performance of the micro-positioning platform are tested. These experimental results obviously show that the micro-positioning platform has good motion characteristics, high positioning accuracy, large movement distance, and large load bearing capacity performance.
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8

Kowalczyk, L., S. Wrotek, P. Dziawa, V. Osinniy, M. Szot, T. Story, A. Yu Sipatov, V. V. Volobuev, and A. G. Fedorov. "Interlayer Exchange Coupling in Semiconductor EuS-PbS Ferromagnetic Wedge Multilayers." Acta Physica Polonica A 110, no. 2 (August 2006): 225–31. http://dx.doi.org/10.12693/aphyspola.110.225.

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9

GUO, Zhao-shi, Wen-bin QIN, Jing LI, You-qiang LIU, Yin-hua CAO, Jiao MENG, Jiao-yang GUAN, et al. "Fiber Coupling of Semiconductor Laser Based on Wedge-shaped Lens." Chinese Journal of Luminescence 42, no. 1 (2021): 98–103. http://dx.doi.org/10.37188/cjl.20200233.

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10

Yang, B. D., and C. H. Menq. "Characterization of Contact Kinematics and Application to the Design of Wedge Dampers in Turbomachinery Blading: Part 1—Stick-Slip Contact Kinematics." Journal of Engineering for Gas Turbines and Power 120, no. 2 (April 1, 1998): 410–17. http://dx.doi.org/10.1115/1.2818138.

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Friction dampers are often used in turbine design to attenuate blade vibration to acceptable levels so as to prolong blades’ service life. A wedge damper, also called a self-centering, blade-to-blade damper, can provide more design flexibility to meet various needs in different operating conditions when compared with conventional platform dampers. However, direct coupling of the two inclined friction interfaces of the wedge damper often leads to very complex contact kinematics. In Part I of this two-part paper, a dual-interface friction force model is proposed to investigate the coupling contact kinematics. The key issue of the model formulation is to derive analytical criteria for the stick-slip transitions that can be used to precisely simulate the complex stick-slip motion and, thus, the induced friction force as well. When considering cyclic loading, the induced periodic friction forces can be obtained to determine the effective stiffness and damping of the interfaces over a cycle of motion. In Part II of this paper, the estimated stiffness and damping are then incorporated with the harmonic balance method to predict the forced response of a blade constrained by wedge dampers.
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11

Koulali, Achraf, Simon McClusky, Phil Cummins, and Paul Tregoning. "Wedge geometry, frictional properties and interseismic coupling of the Java megathrust." Tectonophysics 734-735 (June 2018): 89–95. http://dx.doi.org/10.1016/j.tecto.2018.03.012.

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12

Tariq, Adnan, Shahid Khattak, Hina Munsif, Sohail Razzaq, and Irfanullah Irfanullah. "Linear Pattern Correction Technique for Compensating the Effects of Mutual Coupling and Deformation in Wedge-Shaped Conformal Antenna Arrays." Applied Computational Electromagnetics Society 36, no. 5 (June 14, 2021): 533–41. http://dx.doi.org/10.47037/2020.aces.j.360507.

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In this paper, the effects of mutual coupling and antenna surface deformity in a conformal wedge-shaped antenna array are compensated using a linear pattern correction technique. The problem is formulated to reduce the absolute distance between the actual (simulated) and the desired radiation patterns and to allow for null positioning control. The individual field patterns for the antenna elements are deformed due to changes in mutual coupling and the conformal surface. The deformed patterns of the individual antennas for specific bend angles are stored as lookup tables and interpolated to get the desired radiation pattern at any arbitrary bend-angle. The problem is linearly and quadratically constrained at the null points and performance compared with unconstrained optimization. The proposed solution for diminishing the effect of mutual coupling and surface deformity is independent of main lobe direction, type of individual antenna, array geometry, and spacing between antenna elements. The closed-form results are validated through Computer Simulation Technology (CST) for the wedge-shaped deformed dipole antenna array. The results for the proposed scheme are also assessed with the traditional Open Circuit Voltage Method (OCVM) and show superior compensation for deformity and the mutual coupling effects in conformal beam-forming arrays in terms of main beam direction, position and depth of nulls.
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13

Pan, Chao, Yu Jun Zuo, Shang Gao, and Wei Li. "Numerical Simulation on Hard and Stable Roof Control by Means of Directional Hydraulic Fracturing in Coal Mine." Applied Mechanics and Materials 638-640 (September 2014): 894–97. http://dx.doi.org/10.4028/www.scientific.net/amm.638-640.894.

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Hydraulic fracturing is a method which combines a natural action with a factitious means to alter rock structure. In order to control the extending direction of fracture in the process of hydraulic fracturing, directional hydraulic fracturing is necessary. According to fracture initiation and extension mechanism, taking fully into account the flow-stress-damage coupling effect, simulating with numerical way and analyzing a law of the roof under the dynamic failure process on a working face with a hard and stable roof in 2 cases, the one is the non-directional directional hydraulic fracturing, and the other one is wedge groove directional hydraulic fracturing by RFPA2D-Flow. Based on analyzing the distribution law of the primary stress field on roof surrounding rock, we reveal the control mechanism and behavior law of directed by wedge groove directional fracturing. The study results shows that: First, under the coupling effect from the high hydraulic pressure and crustal stress, failure of roof is not simply a shearing failure, but a compound stress effect from tensile and compress failure which tension contributes more. Second, the directional fracturing by wedge-groove guides to the main fracture progressing into directional expansion, relying on man-made weak plane, it also makes the roof directional hierarchically, timely and fractionated carving come true.
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14

Huijer, Ernst, and Sami Karaki. "Wedge functions applied to 2D magnetostatic problems." Archives of Electrical Engineering 60, no. 4 (December 1, 2011): 519–29. http://dx.doi.org/10.2478/v10171-011-0042-3.

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Wedge functions applied to 2D magnetostatic problems In this paper the application of so called wedge functions is presented to solve two-dimensional simple geometries of magnetostatic and electrostatic problems, e.g. rectangles of varying aspect ratio and with different values of the magnetic permeability μ. Such problems require the use of surface charge density, or segment source, functions of the form ρs = σa-1, where the power parameters, a, have special fractional values. A methodology is presented to determine these special values of a and use them in segment sources on simple geometries, i.e. rectangles of varying aspect ratio, and with different values of the magnetic permeability μ. Wedge solutions are obtained by coupling the strength coefficients of source segments of the same power around an edge. These surface source functions have been used in the analysis of conducting and infinite permeability structures. Here we apply such functions in a boundary integral analysis method to problems having regions of finite permeability.
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15

Kinsey, G. S., R. Sidhu, A. L. Holmes, and J. C. Campbell. "Improved optical coupling in waveguide photodetectors incorporating a wedge-shaped input facet." Optics Letters 27, no. 9 (May 1, 2002): 749. http://dx.doi.org/10.1364/ol.27.000749.

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16

Wu, Di, Jinping Tian, and Rongcao Yang. "Study of mode performances of graphene-coated nanowire integrated with triangle wedge substrate." Journal of Nonlinear Optical Physics & Materials 27, no. 02 (June 2018): 1850013. http://dx.doi.org/10.1142/s0218863518500133.

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A novel type of plasmonic waveguide, consisting of graphene-coated nanowire integrated with triangle wedge substrate and the low-index dielectric gap, is introduced for nanoscale field confinement. Numerical simulations indicate that extremely compact light confinement and low propagation loss can be obtained owing to the strong coupling between the graphene-coated nanowire and the tip of the triangle wedge substrate. Meanwhile, the proposed waveguide is quite tolerant to practical fabrication error for other geometry parameters. The graphene-based waveguide in this study is a natural extension of dielectric waveguide, and may be helpful to the studies and applications of nanoscale optical devices such as photonic integrated circuits and biosensors.
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17

QIU, Z. Q., J. PEARSON, and S. D. BADER. "SHORT-PERIOD OSCILLATIONS OF THE MAGNETIC COUPLING OF EPITAXIAL GROWN Fe/Mo/Fe SANDWICHES ON Mo(100)." Modern Physics Letters B 06, no. 14 (June 20, 1992): 839–49. http://dx.doi.org/10.1142/s0217984992001691.

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Epitaxial Fe / Mo / Fe sandwiches grown onto a Mo (100) single crystal were characterized in situ by electron diffraction and the magneto-optic Kerr effect. The intervening Mo layer is wedge shaped to facilitate the study of the magnetic coupling between the two (14-monolayer thick) Fe films as a function of Mo thickness. The exchange coupling between the Fe films across Mo was found to exhibit oscillatory behavior between antiferromagnetic (AF) and ferromagnetic coupling with a periodicity of ~3 ML of Mo . The shape of the hysteresis loop of the AF-coupled samples was calculated from a simple model that reproduces most of the experimental features.
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18

Sternini, Simone, Albert Y. Liang, and Francesco Lanza di Scalea. "Ultrasonic synthetic aperture imaging with interposed transducer–medium coupling path." Structural Health Monitoring 18, no. 5-6 (October 15, 2018): 1543–56. http://dx.doi.org/10.1177/1475921718805514.

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An interposed coupling material between an ultrasonic transducer and the test medium can be present in various non-destructive inspections and structural health monitoring imaging applications. One example is the wedge medium often used to direct ultrasonic beams into the test material for optimal interaction with internal defects. Another example is the ultrasonic imaging of multilayered structures. This article discusses the ways to perform synthetic aperture focus ultrasonic imaging in these cases where signal losses and complicated refractions at the coupling material/medium interface take place. Three main steps are proposed to maximize image quality. The first step is the delay-multiply-and-sum algorithm that increases the number of independent terms in the beamforming equation compared to the delay-and-sum algorithm. The second step is the utilization of a ray tracing algorithm to properly account for the refraction of the waves in both transmission and reflection paths, and accounting for both L-waves and S-waves that can potentially propagate. The compounding of multiple wave mode combinations is the third step proposed to significantly improve image quality. Validation experiments are presented for a transducer array on a wedge to image two closely spaced holes in an aluminum block. The delay-multiply-and-sum algorithm and wave mode compounding algorithm are also in principle applicable to other structural health monitoring imaging approaches that use, for example, sparse transducer arrays and guided-wave probing.
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19

Däßler, Rolf, and David A. Yuen. "The metastable olivine wedge in fast subducting slabs: Constraints from thermo-kinetic coupling." Earth and Planetary Science Letters 137, no. 1-4 (January 1996): 109–18. http://dx.doi.org/10.1016/0012-821x(95)00219-3.

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20

Cadamuro, Daniela, and Yoh Tanimoto. "Wedge-local observables for factorizing S-matrix with gap in the coupling constant." Reviews in Mathematical Physics 30, no. 04 (April 19, 2018): 1850010. http://dx.doi.org/10.1142/s0129055x18500101.

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In the bootstrap approach to integrable quantum field theories in the [Formula: see text]-dimensional Minkowski space, one conjectures the two-particle S-matrix and tries to study local observables. We find a family of two-particle S-matrices parametrized by two positive numbers, which are separated from the free field or any other known S-matrix. We propose candidates for observables in wedge-shaped regions and prove their commutativity in the weak sense. The sine-Gordon model is conjectured to be equivalent to the Thirring model, and its breather–breather S-matrix components (where the first breather corresponds to the scalar field of the sine-Gordon model) are closed under fusion. Yet, the residues of the poles in this breather–breather S-matrix have wrong signs and cannot be considered as a separate model. Our S-matrices differ from the breather–breather S-matrix in the sine-Gordon model by CDD factors which adjust the signs, so that this sector alone satisfies reasonable assumptions.
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21

Dong, You Kou, Jun Jie Zheng, and Jun Zhang. "Analysis of Flow and Failure Mechanism of Cushion in Rigid Pile Composite Foundation." Advanced Materials Research 168-170 (December 2010): 1491–95. http://dx.doi.org/10.4028/www.scientific.net/amr.168-170.1491.

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A DEM-FDM coupling model was established in this paper to study flow and failure mechanism of cushions with different thickness in rigid pile composite foundation (RPCF). Via analyzing displacement and stress fields in simulation results, the flow of cushion and its mechanical reason was discussed, the results showed that the flow of cushion was mainly caused by the penetration of pile and sand wedge above the pile head; and the shearing of particles along the outlines of pile shaft and the wedge was the main mechanical reason for the flow of cushion. In addition, theoretical discussion of potential failure of cushion in RPCF showed that the bearing capacity of cushion was large enough to keep cushion safe in normal cases.
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22

Lu, Xi Lin, and Feng Di Li. "Study on the Stability of Large Cross-River Shield Tunnel Face with Seepage." Applied Mechanics and Materials 405-408 (September 2013): 1371–74. http://dx.doi.org/10.4028/www.scientific.net/amm.405-408.1371.

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By 3D numerical analysis, the seepage force on the tunnel face was obtained and shows linearly increasing trend with the water level. By considering the average seepage force on the wedge boundary of 3D trapezoidal wedge model, the limit support pressure to keep stability of tunnel face under seepage condition was obtained. The total limit support pressure increases almost linearly with the water level. In order to consider the deformation seepage coupling effect, the 3D coupled deformation and seepage numerical analysis was further used to investigate the influence of the water level on the failure of tunnel face, the results show the failure mode changes with the increase of water level, and the limit support pressure increases nonlinearly with the water level.
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23

Fagereng, Åke. "Wedge geometry, mechanical strength, and interseismic coupling of the Hikurangi subduction thrust, New Zealand." Tectonophysics 507, no. 1-4 (July 2011): 26–30. http://dx.doi.org/10.1016/j.tecto.2011.05.004.

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24

Liu, Xu, and Xiaohan Sun. "Quasi-Axial GRIN Lens Implemented in Wedge-Shaped Fiber Coupling With InP-Based PLC." IEEE Transactions on Components, Packaging and Manufacturing Technology 2, no. 9 (September 2012): 1420–25. http://dx.doi.org/10.1109/tcpmt.2012.2207385.

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25

ARVELO, JUAN I., and ALLAN P. ROSENBERG. "THREE-DIMENSIONAL EFFECTS ON SOUND PROPAGATION AND MATCHED-FIELD PROCESSOR PERFORMANCE." Journal of Computational Acoustics 09, no. 01 (March 2001): 17–39. http://dx.doi.org/10.1142/s0218396x01000413.

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The most recent 2-D split-step Padé parabolic-equation model was modified to include narrow-angle azimuthal coupling. This model was developed and applied to the Santa Barbara channel to assess the effect of 3-D propagation on the performance of a matched-field processor. These results, plus those from the Shallow Water Acoustic Modeling (SWAM) workshop's 3-D wedge and the Gaussian canyon cases, will demonstrate the importance of azimuthal coupling to sound propagation in littoral regions and its effect on the performance of a matched-field processor. Special emphasis is given to model limitations and suitable selection of model parameters that could be automated to achieve accurate predictions during production runs.
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26

Krvavica, Nino, Ivica Kožar, Vanja Travaš, and Nevenka Ožanić. "Numerical modelling of two-layer shallow water flow in microtidal salt-wedge estuaries: Finite volume solver and field validation." Journal of Hydrology and Hydromechanics 65, no. 1 (March 1, 2017): 49–59. http://dx.doi.org/10.1515/johh-2016-0039.

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AbstractA finite volume model for two-layer shallow water flow in microtidal salt-wedge estuaries is presented in this work. The governing equations are a coupled system of shallow water equations with source terms accounting for irregular channel geometry and shear stress at the bed and interface between the layers. To solve this system we applied the Q-scheme of Roe with suitable treatment of source terms, coupling terms, and wet-dry fronts. The proposed numerical model is explicit in time, shock-capturing and it satisfies the extended conservation property for water at rest. The model was validated by comparing the steady-state solutions against a known arrested salt-wedge model and by comparing both steady-state and time-dependant solutions against field observations in Rječina Estuary in Croatia. When the interfacial friction factor λiwas chosen correctly, the agreement between numerical results and field observations was satisfactory.
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27

Faltinsen, Odd M. "Water Entry of a Wedge by Hydroelastic Orthotropic Plate Theory." Journal of Ship Research 43, no. 03 (September 1, 1999): 180–93. http://dx.doi.org/10.5957/jsr.1999.43.3.180.

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Water entry of a hull with wedge-shaped cross sections is analyzed. The stiffened platings between two transverse girders on each side of the keel are separately modeled. Orthotropic plate theory is used. The effect of structural vibrations on the fluid flow is incorporated by solving the two-dimensional Laplace equation in the cross-sectional fluid domain by a generalized Wagner's theory. The coupling with the plate theory provides three-dimensional flow effects. The theory is validated by comparison with full-scale experiments and drop tests. The importance of global ship accelerations is pointed out. Hydrodynamic and structural error sources are discussed. Systematic studies on the importance of hydroelasticity as a function of deadrise angle and impact velocity are presented. This can be related to the ratio between the wetting time of the structure and the greatest wet natural period of the stiffened plating. This ratio is proportional to the deadrise angle and inversely proportional to the impact velocity. A small ratio-means that hydroelasticity is important and a large ratio means that hydroelasticity is not important.
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28

Anderson, D. M., and S. H. Davis. "Local fluid and heat flow near contact lines." Journal of Fluid Mechanics 268 (June 10, 1994): 231–65. http://dx.doi.org/10.1017/s0022112094001333.

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We consider steady two-dimensional fluid flow and heat transfer near contact lines in single-phase and two-phase systems. Both single- and double-wedge geometries admit separable solutions in plane polar coordinates for both thermal and flow fields. We consider the class of functions which have bounded temperatures and velocities at the corner. When free surfaces are present, we seek local solutions, those that satisfy all local boundary conditions, and partial local solutions, those that satisfy all but the normal-stress boundary condition. Our aim in this work is to describe local fluid and heat flow in problems where these fields are coupled by determining for which wedge angles solutions exist, identifying singularities in the heat flux and stress which are present at contact lines, and determining the dependence of these singularities on the wedge angles. For thermal fields in two phases we identify two modes of heat transfer that are analogous to the two modes identified by Proudman & Asadullah (1988) for two-fluid flow. For non-isothermal flow, locally, convection does not play a role but coupling through thermocapillary effects on non-isothermal free surfaces can arise. We find that under non-isothermal conditions a planar free surface must leave a planar rigid boundary at an angle of π, the same angle found by Michael (1958) for an isothermal rigid/free wedge, in order to satisfy all local boundary conditions. Finally, we find that situations arise where no coupled solutions of the form sought can be found; we discuss means by which alternative solutions can be obtained.
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29

Demokritov, S. O., A. B. Drovosekov, D. I. Kholin, N. M. Kreines, H. Nembach, and M. Rickart. "Temperature dependence of interlayer coupling in Fe/Cr/Fe wedge samples: static and dynamic studies." Journal of Magnetism and Magnetic Materials 272-276 (May 2004): E963—E965. http://dx.doi.org/10.1016/j.jmmm.2003.12.1339.

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30

Wenus, Jakub, Liam G. Connolly, David M. Whittaker, Maurice S. Skolnick, and David G. Lidzey. "Tuning the exciton-photon coupling in a strongly coupled organic microcavity containing an optical wedge." Applied Physics Letters 85, no. 24 (December 13, 2004): 5848–50. http://dx.doi.org/10.1063/1.1835556.

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31

Riley, D. J., and L. D. Bacon. "An approximate solution for coupling to a coaxial waveguide which terminates at a conducting wedge." IEEE Transactions on Electromagnetic Compatibility 31, no. 1 (1989): 69–73. http://dx.doi.org/10.1109/15.19909.

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32

Ma, Aning, Guojian Li, and Yuee Li. "Crosstalk and Coupling Analysis of Wedge Plasmon Polariton Waveguides by the Improved Coupled Mode Theory." Journal of Nanoelectronics and Optoelectronics 10, no. 6 (December 1, 2015): 828–32. http://dx.doi.org/10.1166/jno.2015.1846.

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33

Li, Xuetong, Minting Wang, and Fengshan Du. "The coupling thermal–mechanical and microstructural model for the FEM simulation of cross wedge rolling." Journal of Materials Processing Technology 172, no. 2 (February 2006): 202–7. http://dx.doi.org/10.1016/j.jmatprotec.2005.10.011.

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34

Kelley, M. H., J. Unguris, R. J. Celotta, and D. T. Pierce. "Imaging magnetic microstructure with SEMPA." Proceedings, annual meeting, Electron Microscopy Society of America 51 (August 1, 1993): 1032–33. http://dx.doi.org/10.1017/s042482010015099x.

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By measuring the spin polarization of secondary electrons generated in a scanning electron microscope, scanning electron microscopy with polarization analysis (SEMPA) can directly image the magnitude and direction of a material’s magnetization. Because the escape depth of the secondaries is only on the order of 1 nm, SEMPA is especially well-suited for investigating the magnetization of ultra-thin films and surfaces. We have exploited this feature of SEMPA to study the magnetic microstrcture and magnetic coupling in ferromagnetic multilayers where the layers may only be a few atomic layers thick. For example, we have measured the magnetic coupling in Fe/Cr/Fe(100) and Fe/Ag/Fe(100) trilayers and have found that the coupling oscillates between ferromagnetic and antiferromagnetic as a function of the Cr or Ag spacer thickness.The SEMPA apparatus has been described in detail elsewhere. The sample consisted of a magnetic sandwich structure with a wedge-shaped interlayer as shown in Fig. 1.
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35

Wang, Wen-hua, Yi Huang, and Yan-ying Wang. "Further Application of Surface Capturing Method and Cartesian Cut Cell Mesh on Hydroelastic Water-Entry Problems of Free-Falling Elastic Wedge." Mathematical Problems in Engineering 2014 (2014): 1–17. http://dx.doi.org/10.1155/2014/545642.

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In order to study the interactions between fluid and elastic structure (such as marine lifeboat falling down and ship), this paper presents a new CFD method on hydroelastic water-entry problem of free-falling elastic wedge, which can more conveniently handle moving solid boundaries. In the CFD solver, a surface capturing method and the Cartesian cut cell mesh are employed to deal with the moving free surface and solid boundaries, respectively. On the other hand, in structural analysis, the finite element method and lath-beam structural model are introduced to calculate the elastic response. Furthermore, based on the current CFD and structural solver, a particular data transfer method and coupling strategy are presented for the fluid-structure interaction. Finally, by comparing numerical results with experimental data, the present method is validated to be available and feasible for hydroelastic water-entry problem and further successfully adopted to analyze the motion characteristics of free-falling elastic wedge.
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36

Strilets, О. R., V. M. Strilets, and A. A. Stepaniuk. "TENSION AND DEFORMATIONS OF STAR-SHAPED SPRING VERTICES WITH STRANGULATED ENDS OF THE FLEXIBLE COUPLING." ACADEMIC JOURNAL Series: Industrial Machine Building, Civil Engineering 1, no. 48 (March 27, 2017): 26–33. http://dx.doi.org/10.26906/znp.2017.48.767.

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The article examines the structure of overload flexible coupling that contains internal and external hubs, connected by a star-shaped spring with the circular vertices inserted in grooves on the outer surface of internal hub and inner surface of the external hub. Position of the star-shaped spring is fixed on the inner hub by the wedge, which allows the spring to be made either solid or of separate circular vertices with strangulated ends. Geometric synthesis of star-shaped spring with vertices of circular shape, depending on its size was conducted. It is assumed that star spring vertices are the double-hinge arches of circular form. Calculations of analytical solutions using the methods of structural mechanics were done. Analytical expressions proved workability of the star-shaped spring of flexible overload coupling during the torque transmission.
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37

Polonia, A., L. Torelli, L. Gasperini, and P. Mussoni. "Active faults and historical earthquakes in the Messina Straits area (Ionian Sea)." Natural Hazards and Earth System Sciences 12, no. 7 (July 24, 2012): 2311–28. http://dx.doi.org/10.5194/nhess-12-2311-2012.

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Abstract. The Calabrian Arc (CA) subduction complex is located at the toe of the Eurasian Plate in the Ionian Sea, where sediments resting on the lower plate have been scraped off and piled up in the accretionary wedge due to the African/Eurasian plate convergence and back arc extension. The CA has been struck repeatedly by destructive historical earthquakes, but knowledge of active faults and source parameters is relatively poor, particularly for seismogenic structures extending offshore. We analysed the fine structure of major tectonic features likely to have been sources of past earthquakes: (i) the NNW–SSE trending Malta STEP (Slab Transfer Edge Propagator) fault system, representing a lateral tear of the subduction system; (ii) the out-of-sequence thrusts (splay faults) at the rear of the salt-bearing Messinian accretionary wedge; and (iii) the Messina Straits fault system, part of the wide deformation zone separating the western and eastern lobes of the accretionary wedge. Our findings have implications for seismic hazard in southern Italy, as we compile an inventory of first order active faults that may have produced past seismic events such as the 1908, 1693 and 1169 earthquakes. These faults are likely to be source regions for future large magnitude events as they are long, deep and bound sectors of the margin characterized by different deformation and coupling rates on the plate interface.
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38

Fan, Suoya, and Michael A. Murphy. "Three-dimensional strain accumulation and partitioning in an arcuate orogenic wedge: An example from the Himalaya." GSA Bulletin 133, no. 1-2 (April 22, 2020): 3–18. http://dx.doi.org/10.1130/b35528.1.

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Abstract In this study, we use published geologic maps and cross-sections to construct a three-dimensional geologic model of major shear zones that make up the Himalayan orogenic wedge. The model incorporates microseismicity, megathrust coupling, and various derivatives of the topography to address several questions regarding observed crustal strain patterns and how they are expressed in the landscape. These questions include: (1) How does vertical thickening vary along strike of the orogen? (2) What is the role of oblique convergence in contributing to along-strike thickness variations and the style of deformation? (3) How do variations in the coupling along the megathrust affect the overlying structural style? (4) Do lateral ramps exist along the megathrust? (5) What structural styles underlie and are possibly responsible for the generation of high-elevation, low-relief landscapes? Our model shows that the orogenic core of the western and central Himalaya displays significant along-strike variation in its thickness, from ∼25–26 km in the western Himalaya to ∼34–42 km in the central Himalaya. The thickness of the orogenic core changes abruptly across the western bounding shear zone of the Gurla Mandhata metamorphic core complex, demonstrating a change in the style of strain there. Pressure-temperature-time results indicate that the thickness of the orogenic core at 37 Ma is 17 km. Assuming this is constant along strike from 81°E to 85°E indicates that, the western and central Nepal Himalaya have been thickened by 0.5 and 1–1.5 times, respectively. West of Gurla Mandhata the orogenic core is significantly thinner and underlies a large 11,000 km2 Neogene basin (Zhada). A broad, thick orogenic core associated with thrust duplexing is collocated with an 8500 km2 high-elevation, low-relief surface in the Mugu-Dolpa region of west Nepal. We propose that these results can be explained by oblique convergence along a megathrust with an along-strike and down-dip heterogeneous coupling pattern influenced by frontal and oblique ramps along the megathrust.
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39

Shaposhnyk, V. "THE PROBLEM OF BREAKS AUTOMATIC COUPLING." Collection of scientific works of the State University of Infrastructure and Technologies series "Transport Systems and Technologies" 1, no. 37 (June 29, 2021): 21–30. http://dx.doi.org/10.32703/2617-9040-2021-37-3.

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The problem of breaks automatic coupling is becoming urgent for outbound transport. in the robot, a number of defects are shown, which were found in the damaged car parts. Carrying out an analysis of the equipment of the vehicle will indicate the presence of a stock of performance, and if there is a defect in the deteriorated parts of the vehicle, it will be overwhelmed by the stock. An analysis of the normative documentation and methods in the control of car breakdowns is necessary to provide information on the methods of ruinous and non-rudimentary control, so that it can be done when preparing and repairing car breakdowns. Tom found the crocodile in the first place in the world of problems and is to blame for the increase in the quality of control to the body of the vehicle. Proponent is the acoustical control, and the very thin or mirror-thin method for the control of the shank of the autozchep in the screw hole before the wedge of the traction clamp. The robots of the methods runtuyu on the change in the amplitude of the signal when passing through the discontinuity of the metal, which allows the appearance of internal defects. These methods allow the appearance of significant internal defects such as metal discontinuities, but also to reduce the speed of car breakdowns through the appearance of this type of defect. On the basis of the obvious methods for the control of internal defects, the methods are projected that are irregular and can be stagnated to all auto-breakdowns due to minor preparation of the surface for control.
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40

Zhao, Bo, and Tie Jun Cui. "Scattering Characteristics of Targets above a Rough Surface in SAR Images." International Journal of Antennas and Propagation 2013 (2013): 1–10. http://dx.doi.org/10.1155/2013/653438.

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The modeling, simulation, and analysis of target characteristics are essential to a synthetic aperture radar (SAR) image-based autotarget recognition (ATR) system. The coupling effect between targets and rough surface is also important to the electromagnetic scattering and remote sensing. In this work, the simulations to SAR images of targets above a finite rough surface have been investigated. The effect of rough surface on the target characteristics, or the coupling between the rough surface and targets, is analyzed in details by observing changes of locations and intensities of scattering centers in the SAR images. The SAR images are obtained by taking two-dimensional inverse fast Fourier transforms (FFTs) of the scattered fields, which are computed by the combined high-frequency method of shooting and bouncing ray (SBR) and truncated-wedge incremental-length diffraction coefficients (TW-ILDCs). Simulated results of SAR images for complicated targets above a rough surface are given under the 0.25 × 0.25 m2resolution at the X band, in which the coupling effect between targets and rough surface has been studied in details.
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41

Wang, Xin Xin, Cheng He, Pu Zhi Zhao, Yi Zheng, Shi Hao Jiang, and Yan Ding Wei. "Non-Destructive Detection of GIS Aluminum Alloy Shell Weld Based on Oblique Incidence Full Focus Method." Materials Science Forum 1007 (August 2020): 105–10. http://dx.doi.org/10.4028/www.scientific.net/msf.1007.105.

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In this paper, a new ultrasonic phased array full focus imaging method based on oblique incidence is proposed to solve the problem of the non-destructive testing of the internal defects in the GIS (gas insulated switchgear) shell welds. By using wedge coupling, the measured weld is far away from the near-field range of the transducer, and the detection angle range can be increased by changing the propagation direction of the acoustic beam. Based on Snell's law, the propagation characteristics of the ultrasonic wave in the interface are studied. On the basis of the conventional ultrasonic array matrix and the full focus imaging algorithm, by introducing the energy attenuation calibration coefficient of the acoustic wave propagation through the wedge, the correction amplitude of the specific focus point p(x, z) is obtained, The non-destructive testing of weld defects of GIS shell in the spot is carried out, and the test results show that the qualitative and quantitative detection of the weld defects can be well realized by using this method.
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42

Zhu, Wei Bing, Cheng Zhong Deng, and He Shun Wang. "Thermal Deformation in a Dry Gas Seal." Advanced Materials Research 211-212 (February 2011): 222–26. http://dx.doi.org/10.4028/www.scientific.net/amr.211-212.222.

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In order to know thoroughly the thermal deformation characteristics of the dry gas seal in the synthesis gas compressor, the physical model and the thermal equilibrium model of the seal pair are established on its structural and thermal analysis. Based on finite element analysis software ANSYS, separation method are applied to resolve and analyze the temperature field and thermal-structural coupling deformation of the seal pair. The analyzed results show that the temperature of the rotating ring decreases gradually from the end face to the back face, and decreases gradually from the inner radius to the outer radius. The maximum of the temperature gradient of the rotating ring locates at the outer radius of the end face.The deformation of the stationary ring is negative conicity, the deformation of the rotating ring is positive conicity, and the later is the major reason of seal failure. Because of the thermal deformation, the end faces will form a convergent wedge. The convergent wedge favors the formation of a gaseous film, but it will lead to a increase in leakage quantity.
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43

Demokritov, Sergey O., Alexey B. Drovosekov, Dmitry I. Kholin, and Natalia M. Kreines. "Temperature dependence of interlayer coupling in a Fe/Cr/Fe wedge sample. MOKE and MBLS studies." Journal of Magnetism and Magnetic Materials 258-259 (March 2003): 391–93. http://dx.doi.org/10.1016/s0304-8853(02)01123-x.

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44

Skowroński, Witold, Tomasz Stobiecki, Jerzy Wrona, Karsten Rott, Andy Thomas, Günter Reiss, and Sebastiaan van Dijken. "Interlayer exchange coupling and current induced magnetization switching in magnetic tunnel junctions with MgO wedge barrier." Journal of Applied Physics 107, no. 9 (May 2010): 093917. http://dx.doi.org/10.1063/1.3387992.

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45

Abers, Geoffrey A., Peter E. van Keken, and Cian R. Wilson. "Deep decoupling in subduction zones: Observations and temperature limits." Geosphere 16, no. 6 (October 27, 2020): 1408–24. http://dx.doi.org/10.1130/ges02278.1.

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Abstract The plate interface undergoes two transitions between seismogenic depths and subarc depths. A brittle-ductile transition at 20–50 km depth is followed by a transition to full viscous coupling to the overlying mantle wedge at ∼80 km depth. We review evidence for both transitions, focusing on heat-flow and seismic-attenuation constraints on the deeper transition. The intervening ductile shear zone likely weakens considerably as temperature increases, such that its rheology exerts a stronger control on subduction-zone thermal structure than does frictional shear heating. We evaluate its role through analytic approximations and two-dimensional finite-element models for both idealized subduction geometries and those resembling real subduction zones. We show that a temperature-buffering process exists in the shear zone that results in temperatures being tightly controlled by the rheological strength of that shear zone’s material for a wide range of shear-heating behaviors of the shallower brittle region. Higher temperatures result in weaker shear zones and hence less heat generation, so temperatures stop increasing and shear zones stop weakening. The net result for many rheologies are temperatures limited to ≤350–420 °C along the plate interface below the cold forearc of most subduction zones until the hot coupled mantle is approached. Very young incoming plates are the exception. This rheological buffering desensitizes subduction-zone thermal structure to many parameters and may help explain the global constancy of the 80 km coupling limit. We recalculate water fluxes to the forearc wedge and deep mantle and find that shear heating has little effect on global water circulation.
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46

Ji, Zhanling. "Research on thermal-fluid-structure coupling of valve plate pair in an axial piston pump with high pressure and high speed." Industrial Lubrication and Tribology 70, no. 6 (August 13, 2018): 1137–44. http://dx.doi.org/10.1108/ilt-04-2017-0102.

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Purpose High pressure and high speed of the axial piston pump can improve its power density, but they also deteriorate the thermal-fluid-structure coupling effect of the friction pairs. This paper aims to reveal the coupling mechanism of the pump, for example, valve plate pair, by carrying out research on multi-physics field coupling. Design/methodology/approach Considering the influences of temperature on material properties and thermal fluid on structure, the thermal-fluid elastic mechanics model is established. A complete set of fast and effective thermal-fluid-structure coupling method is presented, by which the numerical analysis is conducted for the valve plate pair. Findings According to calculations, it is revealed that the temperature and pressure evolution laws of oil film with time, the pressure distribution law of the fluid, stress and displacement distribution laws of the solid in the valve plate pair. In addition, the forming history of the wedge-shaped oil film and mating clearance change law with rotational speed and outlet pressure in the valve plate pair are presented. Originality/value For an axial piston pump operating under high speed, high pressure and wide temperature range, the multi-physics field coupling analysis is an indispensable means and method. This paper provides theoretical evidence for the development of the pump and lays a solid foundation for the research of the same kind of problem.
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47

Masoomi, Mobin, and Amir Mosavi. "The One-Way FSI Method Based on RANS-FEM for the Open Water Test of a Marine Propeller at the Different Loading Conditions." Journal of Marine Science and Engineering 9, no. 4 (March 24, 2021): 351. http://dx.doi.org/10.3390/jmse9040351.

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This paper aims to assess a new fluid–structure interaction (FSI) coupling approach for the vp1304 propeller to predict pressure and stress distributions with a low-cost and high-precision approach with the ability of repeatability for the number of different structural sets involved, other materials, or layup methods. An outline of the present coupling approach is based on an open-access software (OpenFOAM) as a fluid solver, and Abaqus used to evaluate and predict the blade’s deformation and strength in dry condition mode, which means the added mass effects due to propeller blades vibration is neglected. Wherein the imposed pressures on the blade surfaces are extracted for all time-steps. Then, these pressures are transferred to the structural solver as a load condition. Although this coupling approach was verified formerly (wedge impact), for the case in-hand, a further verification case, open water test, was performed to evaluate the hydrodynamic part of the solution with an e = 7.5% average error. A key factor for the current coupling approach is the rotational rate interrelated between two solution domains, which should be carefully applied in each time-step. Finally, the propeller strength assessment was performed by considering the blades’ stress and strain for different load conditions.
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48

Lee, Soon-Bok, and Alan K. Miller. "A Phenomenological Model for Intergranular Failure by r-type and Wedge-Type Cavitation." Journal of Engineering Materials and Technology 117, no. 3 (July 1, 1995): 311–21. http://dx.doi.org/10.1115/1.2804545.

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Equations to predict local intergranular failure (by “r”-type and “wedge”-type cavitation and the coupling between them) have been developed. The derivation has utilized physically based concepts such as thermal activation of the controlling processes, wedge cracking driven by grain boundary sliding, and cavity growth driven by diffusion. It has also been based upon phenomenological observations such as the variation in the steady-state creep rate with stress and temperature, incomplete healing of cavities under compression, and differences in life under “slow-fast” and “fast-slow” cycling. The model has been tested against data on the low-cycle fatigue life of 304 stainless steel under unequal ramp rates. The new equations simulate, for example, the differences in life produced by slow-fast, fast-slow, and equal ramp rate cycling in terms of their effects on internal cavitation. Simulations have also been generated concerning creep crack advance by cavitation. Together with the new equations’ ability to treat monotonic creep rupture, these comparisons demonstrate that the intergranular failure equations are capable of simulating a number of phenomena of importance in life prediction for high-temperature structures.
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49

Meng, Jiajie, Zheng Li, Ying Liu, Yebin Zhu, Shun Wang, Kui Lin, Jiaqiang Tao, and Jingtao Wang. "Investigation on the Strain Distribution in Tube High-Pressure Shearing." Metals 9, no. 10 (October 19, 2019): 1117. http://dx.doi.org/10.3390/met9101117.

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The Finite-element method (FEM) and experiments were used to investigate the geometric factors and material parameter on the strain distribution during tube high-pressure shearing (t-HPS). The results show that t-HPS could be realized successfully either by pressurizing on both ends of the tube, or by pressurizing using the wedge effect; and in both cases, the “dead metal zone” could be found at both ends of the tube. The grain size distribution from the experiment confirmed this strain distribution feature. In the case of t-HPS pressurized using the wedge effect, the half cone angle has little effect on the strain distribution. Decreasing the strain-hardening exponent leads to increased deformation inhomogeneity in both the ideal t-HPS described by theoretical equations and the close to practical t-HPS described by FEM. This feature of t-HPS stands out from other SPD processes like HPT, and makes practical t-HPS behavior more predictable using the analytical formation than any other SPD processes, and places it an advantageous position in understanding the basics of deformation physics through the coupling between practical experiments and theoretical approaches.
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50

J. Unguris, R. J. Celotta, and D. T. Pierce. "Scanning Electron Microscopy With Polarization Analysis (Sempa) Investigations Of Multilayer Magnetism." Microscopy and Microanalysis 5, S2 (August 1999): 40–41. http://dx.doi.org/10.1017/s1431927600013520.

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Mulitlayers consisting of various combinations of 1-10 nm thick ferromagnetic, antiferromagnetic and nonmagnetic films have numerous applications in magnetic recording, non-volatile data storage, and sensor technologies. One key aspect to understanding how these devices work is being able to image their magnetic structure. SEMPA is well suited for this job, because of its surface sensitivity and compatibility with thin film growth and surface analysis techniques. This talk will review the SEMPA technique and describe thep use of SEMPA in two examples; one in which the magnetization is imaged while growing a multilayer, and another which examines the magnetization while depth profiling a multilayer by ion milling.A SEMPA investigation of the magnetic exchange coupling in an Fe/Cr/Fe sandwich is shown in Figs. 1 and 2. A wedge shaped Cr interlayer was grown as shown in Fig. 1 in order to measure the Cr thickness dependence of the exchange coupling.
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