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Thermal reffusivity: uncovering phonon behavior, structural defects, and domain size

Yangsu XIE, Bowen ZHU, Jing LIU, Zaoli XU, Xinwei WANG

Frontiers in Energy 2018, Volume 12, Issue 1,   Pages 143-157 doi: 10.1007/s11708-018-0520-z

Abstract: Like electrical resistivity which has been historically used as a theory for analyzing structural domainFrom the thermal reffusivity against temperature curves, the Debye temperature of the material and theFrom the residual thermal reffusivity at the 0 K limit, the structural thermal domain (STD) size of crystallineof thermal reffusivity against decreasing temperature profiles, we conclude that they reflected the structural

Keywords: thermal reffusivity theory     phonon behavior     structure defects     structural thermal domain (STD) size     2Dmaterial     amorphous material    

Achieving desired nodal lines in freely vibrating structures via material-field series-expansion topology

Frontiers of Mechanical Engineering 2023, Volume 18, Issue 3, doi: 10.1007/s11465-023-0758-y

Abstract: In this study, an effective material-field series-expansion (MFSE)-based topology optimization designHere, two typical optimization targets are established: (1) minimizing the difference between structuralTo solve this complex optimization problem, the structural topology of structures is first represented

Keywords: nodal line     topology optimization     structural dynamics design     material-field series-expansion    

Magnetic confinement fusion: a brief review

Chuanjun HUANG, Laifeng LI

Frontiers in Energy 2018, Volume 12, Issue 2,   Pages 305-313 doi: 10.1007/s11708-018-0539-1

Abstract: Fusion energy is considered to be the ultimate energy source, which does not contribute to climate change compared with conventional fossil fuel. It is massive compared with unconventional renewable energy and demonstrates fewer safety features compared with unconventional fission energy. During the past several decades, never-ceasing efforts have been made to peacefully utilize the fusion energy in various approaches, especially inertial confinement and magnetic confinement. In this paper, the main developments of magnetic confinement fusion with emphasis on confinement systems as well as challenges of materials related to superconducting magnet and plasma-facing components are reviewed. The scientific feasibility of magnetic confinement fusion has been demonstrated in JET, TFTR, JT-60, and EAST, which instigates the construction of the International Thermonuclear Experimental Reactor (ITER). A fusion roadmap to DEMO and commercial fusion power plant has been established and steady progresses have been made to achieve the ultimate energy source.

Keywords: fusion energy     magnetic confinement     tokamak     structural material     superconducting magnet    

Dynamic material performance of cold-formed steel hollow sections: a state-of-the-art review

Cameron B. RITCHIE, Jeffrey A. PACKER, Xiao-Ling ZHAO, Amin HEIDARPOUR, Yiyi CHEN

Frontiers of Structural and Civil Engineering 2017, Volume 11, Issue 2,   Pages 209-227 doi: 10.1007/s11709-017-0388-8

Abstract: This paper presents a literature review focused on the material performance of cold-formed, carbon steel, hollow structural sections under impulsive (highly dynamic) loading.Next the material toughness, an important energy-absorption property and one measure of a material’sSoftware for modeling blast loading and structural response, the latter including single degree of freedom

Keywords: cold-formed steel     hollow structural sections     composites     impulsive loading     impact     blast     experimentation     analysis     material properties    

Influence factors on natural frequencies of composite materials

Bo WANG, Feng ZHAO, Zixu ZHAO, Kunpeng XU

Frontiers of Mechanical Engineering 2020, Volume 15, Issue 4,   Pages 571-584 doi: 10.1007/s11465-020-0592-4

Abstract: gravity, larger specific strength, larger specific modulus, and better designability structure and structuralHowever, the variability of structural properties hinders the control and prediction of the performance

Keywords: composite material     hammering and frequency sweep test     structural parameter     natural frequency    

Research on recycled concrete and its utilization in building structures in China

Jianzhuang XIAO, Tao DING

Frontiers of Structural and Civil Engineering 2013, Volume 7, Issue 3,   Pages 215-226 doi: 10.1007/s11709-013-0212-z

Abstract: The test results prove that it is feasible to use RAC as a structural material in seismic areas, withThis paper also presents several successful applications of RAC in civil and structural engineering projectsin China, which will serve to promote RAC as a global ecological structural material.

Keywords: recycled aggregate concrete (RAC)     structural material     shaking table tests     building structure    

Material Mechanical Properties Necessary for the Structural Intervention of Concrete Structures Article

Tamon Ueda

Engineering 2019, Volume 5, Issue 6,   Pages 1131-1138 doi: 10.1016/j.eng.2019.02.012

Abstract:

Structural intervention involves the restoration and/or upgrading of the mechanical performances ofIn order to predict structural performance, it is necessary to develop a generic method that is applicableIt is necessary to clarify material properties and structural details in order to achieve better bondingstrength at the interface between the substrate concrete and an externally bonded material.This paper presents the mechanical properties of substrate concrete and relevant intervention material

Keywords: Structural intervention     High fracturing strain     No yielding     Low stiffness     Roughness     fiber-reinforced    

Liquid metal material genome: Initiation of a new research track towards discovery of advanced energy

Lei WANG, Jing LIU

Frontiers in Energy 2013, Volume 7, Issue 3,   Pages 317-332 doi: 10.1007/s11708-013-0271-9

Abstract: With many superior physical properties over conventional fluids, the low melting point liquid metal materialInspired by the Material Genome Initiative as issued in 2011 by the United States of America, a morespecific and focused project initiative was proposed in this paper—the liquid metal material genome aimedThe theoretical strategies and experimental methods in the research and development of liquid metal materialParticularly, the calculation of phase diagram (CALPHAD) approach as a highly effective way for material

Keywords: liquid metal material genome     energy material     material discovery     advanced material     room-temperature liquid    

Robust topology optimization of multi-material lattice structures under material and load uncertainties

Yu-Chin CHAN, Kohei SHINTANI, Wei CHEN

Frontiers of Mechanical Engineering 2019, Volume 14, Issue 2,   Pages 141-152 doi: 10.1007/s11465-019-0531-4

Abstract: Enabled by advancements in multi-material additive manufacturing, lightweight lattice structures consistingThis work proposes a density-based robust topology optimization method for meso- or macro-scale multi-materiallattice structures under any combination of material and load uncertainties.The method utilizes a new generalized material interpolation scheme for an arbitrary number of materialsExamples of a cantilever beam lattice structure under various material and load uncertainty cases exhibit

Keywords: robust topology optimization     lattice structures     multi-material     material uncertainty     load uncertainty    

Approximation of structural damping and input excitation force

Mohammad SALAVATI

Frontiers of Structural and Civil Engineering 2017, Volume 11, Issue 2,   Pages 244-254 doi: 10.1007/s11709-016-0371-9

Abstract: Structural dynamic characteristics are the most significant parameters that play a decisive role in structuralThe complexity of structural damping mechanisms has made this parameter to be one of the ongoing researchlike as linear and nonlinear models which are described as the energy dissipation throughout viscous, materialor structural hysteretic and frictional damping mechanisms.responses plays an important role in structural identification process.

Keywords: structural modal parameters     damping identification method     input excitation force identification     Inverse    

Thoughts on Scientific Issues in Engineering Material Research

yuqiao

Strategic Study of CAE 1999, Volume 1, Issue 3,   Pages 1-4

Abstract: Although some achievements have been accumulated in material research at home and abroad, deeper investigationsare still needed on a more precise model and state equation corresponding to the damage of a specific materialand the erosion of the space articles as well as the increase of the retreat value of the protection materialbelong to the response of materials to high speed collision.Electromagnetic materials such as radome material, infrared stealth material and EM shielding material are all EM functioning materials with EM wave of

Keywords: material for radome     wave absorbing material     infrared stealth material     EMC material    

Effects of green roof damping and configuration on structural seismic response

Frontiers of Structural and Civil Engineering 2023, Volume 17, Issue 8,   Pages 1133-1144 doi: 10.1007/s11709-023-0959-9

Abstract: Hence, their structural resilience or ability to recover from natural events must be considered comprehensively, nonlinear time-history analyses are conducted on a three-story building in SAP2000 to monitor the structuralThe increased damping in the green roof soil is beneficial to the structural performance, i.e., it reducesAdditionally, certain configurations are more effective and beneficial to the structural response thanBased on the findings of this study, new methods of modeling and considering green roofs in structural

Keywords: green infrastructure     green roof     structural resilience     seismic design    

Development of an integrated structural health monitoring system for bridge structures in operational

Xinqun ZHU, Hong HAO

Frontiers of Structural and Civil Engineering 2012, Volume 6, Issue 3,   Pages 321-333 doi: 10.1007/s11709-012-0161-y

Abstract: This paper presents an overview of development of an integrated structural health monitoring system.The integrated system includes vibration and guided-wave based structural health monitoring.system under operational conditions and structural evaluation.The study is mainly focused on developing: integrated sensor technology, integrated structural damageidentification with operational loads monitoring, and integrated structural evaluation with results

Keywords: integrated structural health monitoring     operational conditions     vibration and guided wave    

A MATLAB code for the material-field series-expansion topology optimization method

Frontiers of Mechanical Engineering 2021, Volume 16, Issue 3,   Pages 607-622 doi: 10.1007/s11465-021-0637-3

Abstract: This paper presents a MATLAB implementation of the material-field series-expansion (MFSE) topo-logy optimizationThe MFSE method uses a bounded material field with specified spatial correlation to represent the structuralWith the series-expansion method for bounded fields, this material field is described with the characteristicOther features of this method include inherent control on structural topological complexity, crisp structuraltopology and smooth structural boundaries using the MFSE method.

Keywords: MATLAB implementation     topology optimization     material-field series-expansion method     bounded material    

A novel approach to minimizing material loss for computer numerical control flank-regrinding of worn

Frontiers of Mechanical Engineering 2023, Volume 18, Issue 3, doi: 10.1007/s11465-023-0757-z

Abstract: However, the traditional method involves material waste by trial and error and dramatically decreasesstudy presented a new approach to planning the wheel path for regrinding worn end mills to minimize materialResults showed that the proposed approach could save 25% of cutter material compared with the traditionalThis work effectively provides a general regrinding solution for the worn flank with maximum material-saving

Keywords: flank-regrinding     worn end mill     wheel position and orientation     material loss     over-cut    

Title Author Date Type Operation

Thermal reffusivity: uncovering phonon behavior, structural defects, and domain size

Yangsu XIE, Bowen ZHU, Jing LIU, Zaoli XU, Xinwei WANG

Journal Article

Achieving desired nodal lines in freely vibrating structures via material-field series-expansion topology

Journal Article

Magnetic confinement fusion: a brief review

Chuanjun HUANG, Laifeng LI

Journal Article

Dynamic material performance of cold-formed steel hollow sections: a state-of-the-art review

Cameron B. RITCHIE, Jeffrey A. PACKER, Xiao-Ling ZHAO, Amin HEIDARPOUR, Yiyi CHEN

Journal Article

Influence factors on natural frequencies of composite materials

Bo WANG, Feng ZHAO, Zixu ZHAO, Kunpeng XU

Journal Article

Research on recycled concrete and its utilization in building structures in China

Jianzhuang XIAO, Tao DING

Journal Article

Material Mechanical Properties Necessary for the Structural Intervention of Concrete Structures

Tamon Ueda

Journal Article

Liquid metal material genome: Initiation of a new research track towards discovery of advanced energy

Lei WANG, Jing LIU

Journal Article

Robust topology optimization of multi-material lattice structures under material and load uncertainties

Yu-Chin CHAN, Kohei SHINTANI, Wei CHEN

Journal Article

Approximation of structural damping and input excitation force

Mohammad SALAVATI

Journal Article

Thoughts on Scientific Issues in Engineering Material Research

yuqiao

Journal Article

Effects of green roof damping and configuration on structural seismic response

Journal Article

Development of an integrated structural health monitoring system for bridge structures in operational

Xinqun ZHU, Hong HAO

Journal Article

A MATLAB code for the material-field series-expansion topology optimization method

Journal Article

A novel approach to minimizing material loss for computer numerical control flank-regrinding of worn

Journal Article