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multiscale approach for Unconventional Superconductors

Electromagnetic Science 2024年第2期2卷 36-54页

作者： Yangmu Li Chang Liu Wenxin Cheng Jiaxin Li Beijing National Laboratory for Condensed Matter Physics Institute of PhysicsChinese Academy of SciencesBeijing 100190China School of Physical Sciences University of Chinese Academy of SciencesBeijing 100190China

The remarkable electromagnetic characteristics inherent in unconventional superconductors have catalyzed the advance-ment of numerous technological innovations,spanning from energy-efficient power transmission and high-field magnets to sensitive detectors and quantum computing *** to the functionality of these applications lies the superconducting characteristics,which govern pivotal phenomena including Cooper pair formation and macroscopic phase coherence,resulting in the attainment of zero electrical resistance,complete diamagnetism,and the Josephson tunneling *** complex phases and orders in these ma-terials significantly alter their key electronic and magnetic properties,posing challenges in elucidating the underlying physics and further enhancing their functional *** multiscale approach,representing a useful strategy for understanding materials across diverse length scales using a variety of experimental tools,can reveal intricate details in real and reciprocal spaces,facilitating *** this brief review,we introduce the principle of the multiscale approach along with examples demonstrating its efficacy in unraveling the electronic and magnetic properties of unconventional superconductors.

关键词： Superconductors multiscale approach Electronic and magnetic properties

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An integrated multiscale approach for characterization of rock masses subjected to tunnel excavation

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Journal of Rock Mechanics and Geotechnical Engineering 2018年第3期10卷 513-522页

作者： Gessica Umili Sabrina Bonetto Anna Maria Ferrero Department of Earth Sciences Università degli Studi di Torino

The design of tunnels must be conducted based on the knowledge of the territory. The longer the structure, the larger the area to be investigated, and the greater the number of surveys and tests to be performed in order to thoroughly examine all the relevant features. Therefore, optimization of the investigation process is strongly required to obtain complete and reliable data for the design of the infrastructure. The fast development of remote sensing technologies and the affordability of their products have contributed to proving their benefits as supports for investigation, encouraging the spreading of automatic or semi-automatic methods for regional scale surveys. Similarly, considering the scale of the rock outcrop, photogrammetric and laser scanner techniques are well-established techniques for representing geometrical features of rock masses, and the benefits of non-contact surveys in terms of safety and time consumption are acknowledged. Unfortunately, in most cases, data obtained at different scales of investigations are only partially integrated or compared, probably due to the missing exchange of knowledge among experts of different fields（e.g. geologists and geotechnical engineers）. The authors,after experiencing such a lack of connection among the results of different surveys concerning tunnels,propose a multiscale approach for the optimization of the investigation process, starting from the regional scale, to obtain the data that can be useful not only for planning more detailed surveys in a preliminary phase, but also for making previsions on the discontinuity sets that are present in the rock masses subjected to excavations. A methodological process is proposed and illustrated by means of a case study. Preliminary results are discussed to highlight the potentiality of this method and its limitations.

关键词： Tunnel multiscale approach Geological lineament Non-contact survey Discontinuity Digital terrain model (DTM)

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A multiscale modeling approach to adhesive contact

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Science China(Physics,Mechanics & Astronomy) 2011年第9期54卷 1680-1686页

作者： FAN KangQi WANG WeiDong ZHU YingMin ZHANG XiuYan School of Electronical & Mechanical Engineering Xidian University Xi'an 710071 China

In order to model the adhesive contact across different length scales, a multiscale approach is developed and used to study the adhesive contact behaviors between a rigid cylinder and an elastic face-centered cubic (FCC) substrate. The approach combines an atomistic treatment of the interfacial region with an elastic mechanics method description of the continuum region. The two regions are connected by a coupling region where nodes of the continuum region are refined to atoms of the atomistic region. Moreover, the elastic constants of FCC crystals are obtained directly from the Lennard-Jones potential to describe the elastic response characteristics of the continuum region, which ensures the consistency of material proprieties between atomistic and con- tinuum regions. The multiscale approach is examined by comparing it with the pure MD simulation, and the results indicate that the multiscale modeling approach agrees well with the MD method in studying the adhesive contact behaviors.

关键词： molecular dynamics multiscale approach adhesive contact elastic constants

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On Ductile Damage Modelling of Heterogeneous Material Using Second-Order Homogenization approach

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Computer Modeling in Engineering & Sciences 2021年第3期126卷 915-934页

作者： Jurica Soric Tomislav Lesicar Zdenko Tonkovic Faculty of Mechanical Engineering and Naval Architecture University of ZagrebZagreb10000Croatia

The paper deals with the numerical modelling of ductile damage responses in heterogeneous materials using the classical second-order homogenization *** scale transition methodology in the multiscale framework is *** structure at the macrolevel is discretized by the triangular C^(1) finite elements obeying nonlocal continuum theory,while the discretization of microstructural volume element at the microscale is conducted by means of the mixed type quadrilateral finite element with the nonlocal equivalent plastic strain as an additional nodal *** ductile damage evolution at the microlevel is modelled by using the gradient enhanced *** macrolevel softening is governed by two criterions expressed by the increase in homogenized damage variable and the threshold of the local equivalent *** softening at each material point at the macrolevel is detected by the critical value of the homogenized damage,where homogenization of the damage variable is performed onlywithin softening *** to the nonlocal continuumtheory applied,a realistic softening behaviour is demonstrated after the damage initiation,compared to the widely used first-order homogenization *** algorithms derived have been embedded into the finite element code ABAQUS by means of the user subroutines and verified on the standard benchmark *** damage evolution at both microlevel and macrolevel has been demonstrated.

关键词： Ductile damage second-order homogenization multiscale approach C1 finite element

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