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shape change induced by g_(9/2) rotational alignment in ^(84,86)Mo

Science China(Physics,Mechanics & Astronomy) 2011年第10期54卷 1811-1814页

作者： LIU XuDong SHI Yue XU FuRong School of Physics Peking University Beijing 100871 China School of Physics and State Key Laboratory of Nuclear Physics and Technology Peking University Beijing 100871 China Center for Theoretical Nuclear Physics National Laboratory of Heavy Ion Accelerator Lanzhou 730000 China

Neutron-deficient Z ≈ N nuclei84,86Mo have been investigated using pairing-deformation self-consistent cranked shell modelcalculations up to spin I > 20 . Our calculations are in good agreement with the experimental data, indicating γ-soft triaxial shapesat low rotational frequency and well-deformed triaxial-oblate shapes at high rotational frequency for both nuclei. The shape changeis due to the alignments of the g9/2protons and g9/2neutrons.

关键词： shape change cranked shell model molybdenum

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Autonomous oscillatory shape change of DEA induced by the charge–discharge process under a constant voltage

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Journal of Advanced Dielectrics 2017年第1期7卷 12-16页

作者： Hirohisa Tamagawa Masaki Kakihana Minoru Sasaki Department of Mechanical Engineering Faculty of Engineering Gifu University1-1 YanagidoGifuGifu 501-1193Japan

Despite the promising characteristics of Dielectric Elastomel Actuator(DEA)as a practical soft actuator,the need of high voltage for its operation prevents the successful fabrication of a practical DEA,that is,the high voltage generation takes a bulky and costly power *** of complex shape change motion of DEA such as oscillatory shape change takes even a more bulky and costly multipurpose power *** is a serious practical issue to be *** our latest study,however,we could build a simple DEA system which exhibited a relatively complex and autonomous oscillatory shape change merely under a constant voltage,though the voltage needed was *** successful outcome must broaden the potential usefulness of DEA as a practical soft actuator.

关键词： DEA oscillation shape change charge-discharge

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Strain hardening rate dependency of deformation shape,strain distribution,and contact pressure during wire flat rolling

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Journal of Iron and Steel Research International 2023年第3期30卷 475-486页

作者： Joong-Ki Hwang School of Mechatronics Engineering Korea University of Technology and EducationCheonan 31253Republic of Korea

The effect of the strain hardening exponent(n)of a material on the changes in shape,strain inhomogeneity,and contact pressure was investigated during wire flat rolling to understand its effect on the deformation behavior of a flat-rolled wire and to determine the optimal working conditions with *** deformation behaviors of wires with various n values were systematically compared using finite element *** shape of the deformed wire was found to depend on the n value of the *** the contact width and lateral spreading of the wire decrease with increasing n,resulting in a large reduction in area with the n *** strain homogeneity of the wire increases with the n value of the *** improvement in the strain homogeneity with the n value is attributable to two factors:a lower strain concentration in the central region and a higher overall elongation as n *** addition,the average effective strain of the wire cross section decreases with the n value of a material during wire flat *** contact pressure distribution on the surface of the wire differs significantly depending on the n *** materials with a low n value,the contact pressure exhibits a higher value at the entry and edge zones of the contact *** contrast,materials with high n values exhibit a higher contact pressure at the exit *** behavior can be explained by the strain hardening behavior of the material during wire flat rolling.

关键词： Strain hardening exponent Wire flat rolling shape change Strain inhomogeneity Contact pressure

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shape-changing particles for locally resolved particle geometry in DEM simulations

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Particuology 2024年第6期89卷 185-190页

作者： Enric Illana Klidi Qyteti Maik Scharnowski Maximilian Brömmer Siegmar Wirtz Viktor Scherer Institute of Energy Plant Technology Ruhr-University BochumBochumGermany

Taking into account the complex shape of particles in discrete element method (DEM) simulations of large-scale granular systems is computationally demanding due to the time-consuming contact detection algorithms for polyhedral particles. In this short communication, a novel approach that locally resolves the particle shapes where needed and uses a simplified representation elsewhere, to accelerate simulations without compromising accuracy, is presented. For this purpose, a method employing a smooth transition of the particle shape representation from analytical spheres to shape-resolving polyhedra is introduced in DEM. The feasibility and correct implementation of this approach are demonstrated through simulations of hopper discharge involving spherical and dodecahedral particles from a flat bottom silo or shaft kiln. The model capabilities, in terms of accuracy as well as reduction in computational effort, are quantified for a moving bed with continuous outflow.

关键词： Polyhedron Size change shape change Locally resolved DEM

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