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Toward Analytical Homogenized Relaxation Modulus for Fibrous Composite Material with Reduced Order Homogenization Method

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Computers, Materials & Continua 2025年第1期82卷 193-222页

作者： Huilin Jia Shanqiao Huang Zifeng Yuan HEDPS Center for Applied Physics and Technology(CAPT)Department of Mechanics and Engineering SciencePeking UniversityBeijing100871China State Key Laboratory for Turbulence and Complex Systems Peking UniversityBeijing100871China

In this manuscript,we propose an analytical equivalent linear viscoelastic constitutive model for fiber-reinforced composites,bypassing general computational *** method is based on the reduced-order homogenization(ROH)*** ROH method typically involves solving multiple finite element problems under periodic conditions to evaluate elastic strain and eigenstrain influence functions in an‘off-line’stage,which offers substantial cost savings compared to direct computational homogenization *** to the unique structure of the fibrous unit cell,“off-line”stage calculation can be eliminated by influence functions obtained *** the standard solid model to the ROH method enables the creation of a comprehensive analytical homogeneous viscoelastic constitutive *** method treats fibrous composite materials as homogeneous,anisotropic viscoelastic materials,significantly reducing computational time due to its analytical *** approach also enables precise determination of a homogenized anisotropic relaxation modulus and accurate capture of various viscoelastic responses under different loading *** sets of numerical examples,including unit cell tests,three-point beam bending tests,and torsion tests,are given to demonstrate the predictive performance of the homogenized viscoelastic ***,the model is validated against experimental measurements,confirming its accuracy and reliability.

关键词： Homogenized relaxation modulus viscoelastic standard solid model reduced order homogenization fibrous composite material

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Strain concentration factor of heterogeneous materials and analytical influence functions based on Eshelby tensor

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Theoretical & applied mechanics Letters 2024年第4期14卷 306-313页

作者： Shanqiao Huang Zifeng Yuan HEDPS Center for Applied Physics and TechnologyDepartment of Mechanics and Engineering SciencePeking UniversityBeijing 100871China State Key Laboratory for Turbulence and Complex Systems Peking UniversityBeijing 100871China

In this manuscript,Eshelby tensor is employed to assess the strain concentration that arises in the matrix phase at the interface,offering precise values and locations of maximum strain under specific loading conditions for both spherical and cylindrical *** compared to numerical simulation results,the analytical predictions grounded in the Eshelby tensor exhibit satisfactory *** an analytical calculation method based on Eshelby tensor for the elastic strain influence functions of reduced-order homogenization(ROH)method is developed and adopted on particle-reinforced and fibrous composites,presenting its feasibility and advantage on off-line stage calculation of ROH *** error analyses between analytical and numerical results are *** numerical results also exhibit the necessity of finer interface partitioning to obtain the response on micro-scale with higher resolution.

关键词： Eshelby tensor Strain concentration Composite structures Reduced-order-homogenization Influence functions

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Design method and machine learning application of acoustic holographic computational metamaterials

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Science China(Technological Sciences) 2022年第1期65卷 238-243页

作者： LV ZengYao LI JianQing HOU ZeWei DING YuanShuai XU WangDong PEI YongMao Department of Engineering Mechanics/Center for Flexible Electronics Technology Applied Mechanics LaboratoryTsinghua UniversityBeijing 100084China State Key Laboratory for Turbulence and Complex Systems Department of Mechanics and Engineering ScienceCollege of EngineeringPeking UniversityBeijing 100871China

Acoustic holographic method has been used in imaging,particle manipulation,material preparation and other *** acoustics,it is important to design the implementation of any acoustic wave formation surface[1-5].Traditio... 详细信息

关键词： holographic method acoustics

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Implementing fractional Fourier transform using SH_(0) wave computational metamaterials in space domain

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Science China(Technological Sciences) 2021年第11期64卷 2560-2565页

作者： LV ZengYao DING YuanShuai LI HangYu PEI YongMao Department of Engineering Mechanics Center for Flexible Electronics TechnologyApplied Mechanics LaboratotyTsinghua University'Beijing 100084China State Key Laboratory for Turbulence and Complex Systems Department of Mechanics and Engineering ScienceCollege of EngineeringPeking UniversityBeijing 100871China

Through the design of artificial structures, metamaterials can control the incident wave in the sub-wavelength range to achieve functions that natural materials cannot achieve, such as high absorption, negative refraction, cloaking [1–3],asymmetric propagation [4,5], and holography [6–8]. In recent years, the new concept of computational metamaterials[9–12] has opened up a new direction for analog computing。

关键词： wave fractional refraction

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Droplet impact on wetted structured surfaces

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applied Mathematics and mechanics(English Edition) 2022年第3期43卷 437-446页

作者： M.MOHASAN A.B.AQEEL Huiling DUAN Pengyu LYU Yantao YANG Department of Mechanics and Engineering Science State Key Laboratory for Turbulence and Complex Systems(SKLTCS)Beijing Innovation Center for Engineering Science and Advanced Technology(BIC-ESAT)College of EngineeringPeking UniversityBeijing 100871China Department of Mechatronics Engineering National University of Sciences and TechnologyIslamabad 44000Pakistan Center for Applied Physics and Technology(CAPT) HEDPS and IFSA Collaborative Innovation Center of MoEPeking UniversityBeijing 100871China

In this study,we numerically investigate the droplet impact onto a thin liquid film deposited on a structured surface with square pillars and *** time evolution of crown geometry is strongly affected by the surface *** the thickness of the liquid film is larger than the structure height,the expanding speed of the crown base radius is independent of the structure ***,if the liquid film thickness is equal to the structure height,the crown base expands slower as the structure width *** structures have strong effects on the crown height and radius,and can prevent ejected filament from breaking into satellite droplets for certain *** the liquid film with the thickness equal to the pillar height,both the crown height and the radius exhibit non-monotonic behaviors as the pillar width *** exists one pillar width which produces the smallest crown height and the largest crown radius.

关键词： droplet impact structured surface liquid film crown formation

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Implementing fractional Fourier transform and solving partial differential equations using acoustic computational metamaterials in space domain

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Acta Mechanica Sinica 2021年第9期37卷 1371-1377,I0001页

作者： Zengyao Lv Peng Liu Yuanshuai Ding Hangyu Li Yongmao Pei Department of Engineering Mechanics Center for Flexible Electronics TechnologyApplied Mechanics LaboratoryTsinghua UniversityBeijing100084China State Key Laboratory for Turbulence and Complex Systems Department of Mechanics and Engineering ScienceCollege of EngineeringPeking UniversityBeijing100871China Locomotive and Car Research Institute China Academy of Railway Sciences Corporation LimitedBeijing100081China

Metamaterials can control incident waves in the sub-wavelength range through the design of artificial structures, and realize the functions that natural materials cannot achieve. The study of metamaterials has important theoretical value and application prospects. In recent years, the proposal of computational metamaterials has opened up a brand-new direction for analog computing, providing high-throughput, energy-free computing methods for special computing tasks. However, the development of acoustic computing metamaterials is relatively preliminary, and it is necessary to develop design theories. There is no work to solve partial differential equations and realize fractional Fourier transform in spatial domain acoustic computing metamaterials. In this paper, the acoustic wave computational metamaterial is designed, and the simulation realizes the spatial domain fractional Fourier transform and partial differential equation calculation. It is expected that acoustic computational metamaterials will enable new capabilities in signal acquisition and processing, network computing, and drive new applications of sound wave.

关键词： Fractional Fourier transform Partial differential equations Acoustic computational metamaterials

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Phase-field simulation of magnetic double-hole nanoring and its application in random storage

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International Journal of Smart and Nano Materials 2021年第2期12卷 157-184页

作者： Zengyao Lv Xiaoyu Zhang Honglong Zhang Zhitao Zhou Duo Xu Yongmao Pei Department of Engineering Mechanics Center for Flexible Electronics TechnologyApplied Mechanics LaboratoryTsinghua UniversityBeijing 100084P.R.China State Key Laboratory for Turbulence and Complex Systems Department of Mechanics and Engineering ScienceCollege of EngineeringPeking UniversityBeijing 100871P.R.China College of Civil Engineering and Transportation South China University of TechnologyGuangzhouP.R.China

As an ideal high-density storage unit,magnetic nanorings have become a research hotspot in recent *** can both study the evolution of microscopic state of magnetization and acquire macroscopic magnetic properties by micromagnetic simulation,which has thus been widely ***,traditional micromagnetism cannot simulate complex stress *** to the introduction of microelasticity theory,the phase field method for magnetic materials can be used to calculate the coupling effect of stress and magnetic ***,the computing model usually needs to satisfy periodic boundary *** this paper,the phase field simulation combined with the finite element method is *** using user defined element,the evolution of magnetic domain structures of the double-hole nanorings has been *** different diameter of the holes and external magnetic field direction,we have found seven kinds of magnetic domain evolution *** them,the twin-vortex evolution mechanism with high stability and low demagnetization interference characteristics of advantages,has good application prospect in magnetic random-access memory(MRAM)unit.

关键词： Micromagnetic simulation phase field method finite element method magnetic random-access memory magnetic nanoring

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Effects of Internal Resonance and Damping on Koopman Modes

arXiv

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arXiv 2024年

作者： Das, Rahul Bajaj, Anil K. Gupta, Sayan Department of Applied Mechanics and Biomedical Engineering Indian Institute of Technology Madras India School of Mechanical Engineering Purdue University Purdue United States Center for Complex Systems and Dynamics IIT Madras India

This study investigates the nonlinear normal modes (NNMs) of a system comprising of two coupled Duffing oscillators, with one oscillator being grounded and with the coupling being both linear and nonlinear. The study utilizes the eigenfunctions of the Koopman operator and validates their connection with the Shaw-Piere invariant manifold framework for NNMs. Furthermore, the study delves into the impact of internal resonance and dissipation on the accuracy of this framework by defining a continuous quantitative measure for internal resonance. The applicability and robustness of the framework for the systems which are very similar qualitatively to that of an ENO, are also observed and discussed about the limitations of the approximation technique. © 2024, CC BY.

关键词： Eigenvalues and eigenfunctions

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Ultrastable Viologen Ionic Liquids-Based Ionogels for Visible Strain Sensor Integrated with Electrochromism,Electrofluorochromism,and Strain Sensing

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CCS Chemistry 2023年第8期5卷 1917-1930页

作者： Yueyan Zhang Mengying Guo Guoping Li Xiaoliang Chen Zishun Liu Jinyou Shao YongAn Huang Gang He Frontier Institute of Science and Technology Xi’an Jiaotong UniversityXi’an 710054 Micro-/Nano-technology Research Center State Key Laboratory for Manufacturing Systems EngineeringXi’an Jiaotong UniversityXi’an 710054 International Center for Applied Mechanics State Key Laboratory for Strength and Vibration of Mechanical StructuresXi’an Jiaotong UniversityXi’an 710049 State Key Laboratory of Digital Manufacturing Equipment and Technology Huazhong University of Science and TechnologyWuhan 430074

Flexible electronics play a key role in the development of human society and our daily *** they are expected to revolutionize personal health ***,it remains challenging to fabricate smart sensors with high robustness,reliability,and visible ***,high-performance electrochromic(EC),electro-fluorochromic(EFC),and double-network ionogels with excellent transmissivity,high mechanical robustness,and ultrastable reversibility are prepared by combination of thienoviologen-containing ionic liquids with poly(ethyl acrylate)*** ionogels exhibit good mechanical properties(1000%stretchability and 3.2 kJ m^(−2) fracture energy).The ionogel-based EC devices have a significantly simplified device fabrication process as well as superior cycling stability in which 88%of the contract ratio is maintained at 88%at 500 cycles,even after being stored for 2 years under ambient atmosphere(relative humidity:30%∼40%,25°C).The conductivity of ionogels showed a fast and reproducible response to strain,and the conductivity decreased with increased *** virtue of the EC and EFC properties of the thienoviologen component,the EC and EFC efficiency decreased with the increased strain loaded on the ionogels,and almost no EC or EFC phenomena were observed when the strain was above 300%.This feasible strategy provides an opportunity for the development of visible strain sensors to monitor the body’s movements through color and fluorescence emission.

关键词： ionogels flexible electronics viologen electrochromism strain sensor

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Development of a Hypersonic Entry Test Platform

Development of a Hypersonic Entry Test Platform

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AIAA Science and Technology Forum and Exposition, AIAA SciTech Forum 2025

作者： Johnson, Breanna J. Johnson, Kate E. Jang, Peter Steffes, Stephen R. Fritz, Matthew P. Hawke, Veronica Garcia, Joseph A. Morr, Donald E. NASA Johnson Space Center Flight Mechanics and Trajectory Design Branch HoustonTX77058 United States NASA Johnson Space Center Applied Aeroscience and CFD Branch HoustonTX77058 United States Aerodyne Industries Applied Aeroscience and CFD Branch HoustonTX77058 United States Charles Stark Draper Laboratory Navigation Algorithms and Software Space GNC Group HoustonTX77058 United States Science Technology Corporation Systems Analysis Office Mountain ViewCA United States NASA Ames Research Center NASA Systems Analysis Office Mountain ViewCA94035 United States Millennium Engineering and Integration Company ArlingtonVA22202 United States

ISBN: (数字)9781624107238

ISBN: (纸本)9781624107238

NASA is designing and building a low-cost, scalable, rapidly developed test platform to lower the barrier to entry for entry, descent, and landing (EDL) technologies. This HyperSonic Testing for Entry Platform, HyperSTEP, will enable the low-cost flight demonstration of hypersonic entry technologies, leveraging a publishable government reference design to further enable future government and industry landers. The HyperSTEP vehicle leverages a lifting body shape that was originally designed for a NASA human-class Mars mission concept vehicle, the CobraMRV. Lifting body vehicles offer increased volume efficiency and greater range control capabilities over capsules, making them an attractive class of vehicles to further develop for small to large payload return missions from the Moon, Mars, and beyond. Progress has been made in the development of the HyperSTEP vehicle in the areas of aerodynamics, aerothermodynamics, structural design and packaging, propulsion, guidance navigation and control (GN&C), decelerators (i.e., parachutes), and the thermal protection system (TPS). This paper details progress made in refining the mission concept of operations (ConOps) for the first notional missions and the development of the aerodynamic and aerothermodynamic databases, GN&C, and parachute system, as the project moves into its build and test phase. © 2025, American Institute of Aeronautics and Astronautics Inc, AIAA. All rights reserved.

关键词： NASA

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