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A novel triple periodic minimal surface-like plate lattice and its data-driven optimization method for superior mechanical properties

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applied Mathematics and Mechanics(English Edition) 2024年第2期45卷 217-238页

作者： Yanda WANG Yanping LIAN Zhidong WANG Chunpeng WANG Daining FANG State Key Laboratory for Turbulence and Complex Systems&Center for Applied Physics and Technology College of EngineeringPeking UniversityBeijing 100871China Institute of Advanced Structure Technology Beijing Institute of TechnologyBeijing 100081China

Lattice structures can be designed to achieve unique mechanical properties and have attracted increasing attention for applications in high-end industrial equipment,along with the advances in additive manufacturing(AM)*** this work,a novel design of plate lattice structures described by a parametric model is proposed to enrich the design space of plate lattice structures with high connectivity suitable for AM *** parametric model takes the basic unit of the triple periodic minimal surface(TPMS)lattice as a skeleton and adopts a set of generation parameters to determine the plate lattice structure with different topologies,which takes the advantages of both plate lattices for superior specific mechanical properties and TPMS lattices for high connectivity,and therefore is referred to as a TPMS-like plate lattice(TLPL).Furthermore,a data-driven shape optimization method is proposed to optimize the TLPL structure for maximum mechanical properties with or without the isotropic *** this method,the genetic algorithm for the optimization is utilized for global search capability,and an artificial neural network(ANN)model for individual fitness estimation is integrated for high efficiency.A set of optimized TLPLs at different relative densities are experimentally validated by the selective laser melting(SLM)fabricated *** is confirmed that the optimized TLPLs could achieve elastic isotropy and have superior stiffness over other isotropic lattice structures.

关键词： lattice structure triple periodic minimal surface(TPMS) plate lattice structural optimization machine learning

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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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Stiffness and toughness of soft/stiff suture joints in biological composites

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applied Mathematics and Mechanics(English Edition) 2022年第10期43卷 1469-1484页

作者： Dong WU Yixing HUANG Ming LEI Zeang ZHAO Xiaogang GUO Daining FANG State Key Laboratory for Turbulence and Complex Systems&Center for Applied Physics and Technology College of EngineeringPeking UniversityBeijing 100871China Beijing Key Laboratory of Lightweight Multi-functional Composite Materials and Structures Beijing Institute of TechnologyBeijing 100081China State Key Laboratory of Explosion Science and Technology Beijing Institute of TechnologyBeijing 100081China School of Astronautics Northwestern Polytechnical UniversityXi’an 710072China

Biological composites can overcome the conflict between strength and toughness to achieve unprecedented mechanical properties in engineering *** suture joint,as a kind of heterogeneous architecture widely existing in biological tissues,is crucial to connect dissimilar components and to attain a tradeoff of all-sided functional ***,the suture joints have attracted many researchers to theoretically investigate their mechanical ***,most of the previous models focus on the sutural interface between two chemically similar stiff phases with(or without)a thin adhesive layer,which are under the framework of linear elasticity and small ***,a general model based on the finite deformation framework is proposed to explore the stiffness and toughness of chemically dissimilar suture joints connecting soft and stiff *** tension tests are conducted to investigate the tensile response of the suture joints,and finite element simulations are implemented to explore the underlying mechanisms,considering both material nonlinearity and cohesive properties of the *** failure modes are quantitively captured by our *** stored elastic energy in the soft phase competes with the energy dissipation due to the interface debonding,which controls the transition among different failure *** toughness of the suture joints depends on not only the intrinsic strengths of the constituent materials and their cohesive strength,but also the interfacial *** work provides the structureproperty relationships of the soft/stiff suture joints and gives a foundational guidance of mechanical design towards high-performance bioinspired composites.

关键词： suture joint biological composite finite deformation toughness

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Quantum-enriched large-eddy simulation with the incompressible Schrodinger flow

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Acta Mechanica Sinica 2025年第1期41卷 95-105页

作者： Zishuo Han Yue Yang State Key Laboratory for Turbulence and Complex Systems College of EngineeringPeking UniversityBeijing 100871China Key Laboratory of High Energy Density Physics Simulations Center for Applied Physics and TechnologyPeking UniversityBeijing 100871China Received January 282024

We propose a hybrid quantum-classical method,the quantum-enriched large eddy simulation(QELES),for simulating *** QELES combines the large-scale motion of the large eddy simulation(LES)and the subgrid motion of the incompressible Schrodinger flow(ISF).The ISF is a possible way to be simulated on a quantum computer,and it generates subgrid scale turbu-lent structures to enrich the LES *** enriched LES field can be further used in turbulent combustion and multi-phase flows in which the subgrid scale motion plays an important *** a conceptual study,we perform the simulations of ISF and LES separately on a classical computer to simulate decaying homogeneous isotropic ***,the QEI ES velocity is obtained by the time matching and the spectral blending *** QEL ES achieves significant improvement in predicting the energy spectrum,probaility density functions of velocity and vorticity components,and velocity structure functions,and reconstructs coherent small-scales vortices in the direct numerical simulation(DNS).On the other hand,the vortices in the QELES are less elongated and tangled than those in the DNS,and the magnitude of the third-order structure function in the QELES is less than that in the DNS,due to the diferent constitutive relations in the viscous flow and ISE.

关键词： Quantum computing Large-eddy simulation Subgrid motion

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基于定量机电阻抗方法的混凝土固化过程模量和内耗测量监测

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Acta Mechanica Sinica 2023年第10期39卷 116-123页

作者：刘伯峰唐骥骅谢明宇李法新 State Key Laboratory for Turbulence & Complex Systems College of Engineering Peking University Beijing 100871 China Center for Applied Physics and Technology Peking University Beijing 100871 China

测定新鲜混凝土凝固状态对于控制建筑质量和安全至关重要.实际上,混凝土通常需要约28天时间进行养护,期间混凝土凝固并加强,直至达到可使用标准.传统的混凝土养护过程通常使用超声波等方法测量杨氏模量.在这项工作中,我们提出了一种基... 详细信息

测定新鲜混凝土凝固状态对于控制建筑质量和安全至关重要.实际上,混凝土通常需要约28天时间进行养护,期间混凝土凝固并加强,直至达到可使用标准.传统的混凝土养护过程通常使用超声波等方法测量杨氏模量.在这项工作中,我们提出了一种基于定量机电阻抗方法(Q-EMI)精确测量模量和内耗的实时混凝土养护监测方法.结果表明,模量和内耗均可用于监测混凝土养护过程,且模量测量更准确,因其受支撑条件影响较小.对于特定的混凝土,杨氏模量在4天后趋于稳定,剪切模量在7天后才能稳定,因此剪切模量测量更适合用于监测混凝土养护过程.此外,还发现养护时间对砂/水泥比非常敏感.这项工作为使用小样本监测混凝土养护过程提供了一种便捷方法.

关键词：混凝土养护混凝土凝固剪切模量支撑条件养护时间机电阻抗杨氏模量监测方法

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Identification of partial differential equations from noisy data with integrated knowledge discovery and embedding using evolutionary neural networks

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Theoretical & applied Mechanics Letters 2024年第2期14卷 90-97页

作者： Hanyu Zhou Haochen Li Yaomin Zhao HEDPS Center for Applied Physics and Technologyand College of EngineeringPeking UniversityBeijing 100871China State Key Laboratory for Turbulence and Complex Systems College of EngineeringPeking UniversityBeijing 100871China

Identification of underlying partial differential equations(PDEs)for complex systems remains a formidable *** the present study,a robust PDE identification method is proposed,demonstrating the ability to extract accurate governing equations under noisy conditions without prior ***,the proposed method combines gene expression programming,one type of evolutionary algorithm capable of generating unseen terms based solely on basic operators and functional terms,with symbolic regression neural *** networks are designed to represent explicit functional expressions and optimize them with data *** particular,the specifically designed neural networks can be easily transformed to physical constraints for the training data,embedding the discovered PDEs to further optimize the metadata used for iterative PDE *** proposed method has been tested in four canonical PDE cases,validating its effectiveness without preliminary information and confirming its suitability for practical applications across various noise levels.

关键词： PDE discovery Gene Expression Programming Deep Learning Knowledge embedding

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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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Sandwich-Structured Solar Cells with Accelerated Conversion Efficiency by Self-Cooling and Self-Cleaning Design

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Journal of Bionic Engineering 2024年第6期21卷 2955-2968页

作者： Huide Fu Ben Wang Rui He Yongpu Yang Hongyuan Li Zhiguang Guo College of Chemistry and Environmental Engineering Shenzhen UniversityShenzhen518060China State Key Laboratory for Turbulence and Complex Systems Department of Mechanics and Engineering ScienceBeijing Innovation Center for Engineering Science and Advanced TechnologyCollege of EngineeringPeking UniversityBeijing100871China Hubei Collaborative Innovation Centre for Advanced Organic Chemical Materials and Ministry of Education Key Laboratory for the Green Preparation and Application of Functional Materials Hubei UniversityWuhan430062PR China State Key Laboratory of Solid Lubrication Lanzhou Institute of Chemical PhysicsChinese Academy of ScienceLanzhou730000PR China

Photovoltaic(PV)power generation is highly regarded for its capability to transform solar energy into electrical ***,in real-world applications,PV modules are prone to issues such as increased self-heating and surface dust accumulation,which contribute to a reduction in photoelectric conversion ***,elevated temperatures can adversely affect the components’operational *** augment the efficiency and extend the lifespan of PV modules,it is crucial to implement cooling strategies and periodic surface dust *** this research,we introduce a composite PV module design that amalgamates a hygroscopic hydrogel with self-cleaning *** design incorporates a superhydrophobic polydimethylsiloxane(PDMS)film as its exposed surface layer and employs a PAM-CaCl2-SiC hygroscopic hydrogel for rear *** arrangement is intended to facilitate efficient surface self-cleaning and passive cooling of the composite PV *** studies were conducted to evaluate the performance of this innovative composite PV module design,and the results showed that the composite PV panel had an increase of about 1.39%in power generation compared to an ordinary PV panel in the spring of Shenzhen,China.

关键词： Self-cleaning Solar cell Superhydrophobic Hygroscopic hydrogel Conversion efficiency

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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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