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Recent developments in selective laser processes for wearable devices

Bio-design and Manufacturing 2024年第4期7卷 517-547页

作者： Youngchan Kim Eunseung Hwang Chang Kai Kaichen Xu Heng Pan Sukjoon Hong Optical Nanoprocessing Lab Department of Mechanical EngineeringBK21 FOUR ERICA-ACE CenterHanyang University55 Hanyangdaehak-RoSangnok-GuAnsan 15588Republic of Korea multiscale Manufacturing Lab J.Mike Walker’66 Department of Mechanical EngineeringTexas A&M UniversityCollege StationTX 77843USA State Key Laboratory of Fluid Power and Mechatronic Systems School of Mechanical EngineeringZhejiang UniversityHangzhou 310058China

Recently,the increasing interest in wearable technology for personal healthcare and smart virtual/augmented reality applications has led to the development of facile fabrication *** have long been used to develop original solutions to such challenging technological problems due to their remote,sterile,rapid,and site-selective processing of *** this review,recent developments in relevant laser processes are summarized under two separate ***,transformative approaches,such as for laser-induced graphene,are *** addition to design optimization and the alteration of a native substrate,the latest advances under a transformative approach now enable more complex material compositions and multilayer device configurations through the simultaneous transformation of heterogeneous precursors,or the sequential addition of functional layers coupled with other electronic *** addition,the more conventional laser techniques,such as ablation,sintering,and synthesis,can still be used to enhance the functionality of an entire system through the expansion of applicable materials and the adoption of new ***,various wearable device components developed through the corresponding laser processes are discussed,with an emphasis on chemical/physical sensors and energy *** addition,special attention is given to applications that use multiple laser sources or processes,which lay the foundation for the all-laser fabrication of wearable devices.

关键词： Selective laser process Wearable device Transformative approach Laser-induced graphene Ablation Sintering Synthesis

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Strong dependency of lithium diffusion on mechanical constraints in high-capacity Li-ion battery electrodes

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Acta Mechanica Sinica 2012年第4期28卷 1068-1077页

作者： Yi-Fan Gao Min Zhou The George W. Woodruff School of mechanical Engineering The School of Materials Science and EngineeringGeorgia Institute of Technology Atlanta GA30332-0405 USA wcu program on multiscale mechanical design School of Mechanical and Aerospace EngineeringSeoul National University Seoul Korea

The effect of external constraints on Li diffusion in high-capacity Li-ion battery electrodes is investigated using a coupled finite deformation theory. It is found that thinfilm electrodes on rigid substrates experience much slower diffusion rates compared with free-standing films with the same material properties and geometric dimensions. More importantly, the study reveals that mechanical driving forces tend to retard diffusion in highly-constrained thin films when lithiation-induced softening is considered, in contrast to the fact that mechanical driving forces always enhance diffusion when deformation is fully elastic. The results provide further proof that nano-particles are a better design option for nextgeneration alloy-based electrodes compared with thin films.

关键词： Li-ion battery - Inelastic flow Lithiation in- duced softening Changing rate

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design rules for a tunable merged-tip microneedle

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Microsystems & Nanoengineering 2018年第1期4卷 85-94页

作者： Jungeun Lim Dongha Tahk James Yu Dal-Hee Min Noo Li Jeon School of mechanical and Aerospace Engineering Seoul National UniversitySeoul 08826South Korea Division of wcu multiscale mechanical design Seoul National UniversitySeoul 08826South Korea Institute of Advanced Machinery and design Seoul National UniversitySeoul 08826South Korea Interdisciplinary program for Bioengineering Seoul National UniversitySeoul 08826South Korea Department of Chemistry Seoul National UniversitySeoulSouth Korea

This publication proposes the use of an elasto-capillarity-driven self-assembly for fabricating a microscale merged-tip structure out of a variety of biocompatible UV-curable polymers for use as a microneedle *** addition,the novel merged-tip microstructure constitutes a new class of microneedles,which incorporates the convergence of biocompatible polymer micropillars,leading to the formation of a sharp tip and an open cavity capable of both liquid trapping and volume *** combined with biocompatible photopolymer micropillar arrays fabricated with photolithography,elasto-capillarity-driven self-assembly provides a means for producing a complex microneedle-like structure without the use of micromolding or *** publication also explores and defines the design rules by which several fabrication aspects,such as micropillar dimensions,shapes,pattern array configurations,and materials,can be manipulated to produce a customizable microneedle array with controllable cavity volumes,fracture points,and merge *** addition,the incorporation of a modular through-hole micropore membrane base was also investigated as a method for constitutive payload delivery and fluid-sampling *** flexibility and fabrication simplicity of the merged-tip microneedle platform holds promise in transdermal drug delivery applications.

关键词： microstructure needle cavity

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Maintaining the Spatial Periodicity in the Topology Optimization of Phononic Crystals for Bandgap Maximization and Creation

Maintaining the Spatial Periodicity in the Topology Optimiza...

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The Seventh China-Japan-Korea Joint Symposium on Optimization of Structural and mechanical Systems

作者： Young Kwan Ahn Joo Hwan Oh Pyung Sik Ma Yoon Jae Kim Yoon Young Kim wcu multiscale mechanical design Division School of Mechanical and Aerospace EngineeringSeoul National University599 Gwanak-GuSeoul 151-742Korea Institute of Advanced Machinery and design School of Mechanical and Aerospace EngineeringSeoul National University599 Gwanak-GuSeoul 151-742Korea

Crystal structures having periodically arranged inclusions inside a homogeneous matrix,called Phononic Crystals （PC’s）,exhibit various wave phenomena such as negative refraction,wave focusing,mode splitting,***,one of the most remarkable properties is a bandgap phenomenon,which refers to wave propagations inside a PC are forbidden in certain *** the bandgap phenomenon is applied in various applications such as wave guiding and wave filtering etc.,there have been growing needs for the PC having wider bandgap frequency ranges.A number of researches [1-4] have successfully designed PC’s having the maximized bandgap frequency *** researches have shown that the design of the unit cell of PC’s can be ***,no earlier investigation has so far paid attentions to the singular issue which will be mainly concerned in this paper - the reduction of the spatial *** found that the optimized unit cell may correspond to shorter spatial periods so that the initial assumption on the periodicity is no longer *** means that the size of the unit cell in the direct lattice originally defined in the topology optimization formulation often turns out to be reduced in the final optimized unit cell especially when the creation and maximization of a bandgap are simultaneously *** unit cell size reduction can occur in various lattice structures including square and rectangular unit *** is found that the reduction of the spatial period can be a critical problem because the reduction can lead to incorrect optimized ***,without any control on the periodicity,maintaining the originally set-up periodicity is not ***,a new technique is required to avoid the reduction of the spatial *** dealing with a technique to control the cell size during optimization iterations,the first part of this work is focused on the explanation of the issue in some details about the characteristic of reduced unit cell

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multiscale model of micro curing residual stress evolution in carbon fiber-reinforced thermoset polymer composites

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Frontiers of mechanical Engineering 2020年第3期15卷 475-483页

作者： Xinyu HUI Yingjie XU Weihong ZHANG State IJR Center of Aerospace design and Additive Manufacturing School of Mechanical EngineeringNorthwestern Polytechnical UniversityXi’an 710072China Shaanxi Engineering Laboratory of Aerospace Structure design and Application School of Mechanical EngineeringNorthwestern Polytechnical UniversityXi’an 710072China

In this study,the micro curing residual stresses of carbon fiber-reinforced thermoset polymer(CFRP)composites are evaluated using a multiscale modeling method.A thermochemical coupling model is developed at the macroscale level to obtain the distributions of temperature and degree of ***,a representative volume element model of the composites is established at the microscale *** introducing the information from the macroscale perspective,the curing residual stresses are calculated using the microscale *** evolution of curing residual stresses reveals the interaction mechanism of fiber,matrix,and interphase period during the curing *** show that the curing residual stresses mostly present a tensile state in the matrix and a compressive state in the ***,the curing residual stresses at different locations in the composites are calculated and *** results provide an important guideline for the analysis and design of CFRP composite structures.

关键词： CFRP curing residual stress multiscale modeling finite element method

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Pressure-induced structure,electronic,thermodynamic and mechanical properties of Ti_(2)AlNb orthorhombic phase by first-principles calculations

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Rare Metals 2021年第10期40卷 2964-2974页

作者： Zhen-Yi Wei Kang-Ming Hu Bai-Sheng Sa Bo Wu multiscale Computational Materials Facility School of Materials Science and EngineeringFuzhou UniversityFuzhou 350100China

Effects of pressure on lattice parameters, electronic, thermodynamic and mechanical properties of the fully ordered Ti_(2)AlNb orthorhombic phase were studied using first-principles calculations based on density functional theory(DFT). The bonding nature for ordering orthorhombic Ti_(2)AlNb was revealed quantitatively through the electronic structure analyzing. The external pressures play limited roles in the elastic anisotropy of the alloy due to the outstanding dynamical and mechanical stabilities under pressure. However, the shear modulus of O phase manifests anisotropic, where {010} shear planes are the easiest planes to cleave among the principal planes under all *** heat capacities, volume expansions and thermal expansion coefficients were calculated using the quasi-harmonic approximation model based on the phonon dispersion curves. Meanwhile, the bulk modulus, Young’s modulus,shear modulus and the hardness are promptly enhanced under pressure. The predicted results give hints to design Ti_(2)AlNb-based alloy as high-pressure applications.

关键词： Ti2AlNb-based orthorhombic phase Pressure-induced effect Thermodynamic properties mechanical properties First-principles calculations

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3D Nanoprinting with Charged Aerosol Particles-An Overview

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Accounts of Materials Research 2021年第11期2卷 1117-1128页

作者： Wooik Jung Peter V.Pikhitsa Yoon-Ho Jung Jooyeon Shin Minsung Han Mansoo Choi Global Frontier Center for multiscale Energy Systems Seoul National UniversitySeoul 08826Korea Department of mechanical Engineering Seoul National UniversitySeoul 08826Korea

CONSPECTUS:Three-dimensional(3D)printing is a revolutionary technology allowing rapid,cost-effectively,and flexible design of desired 3D *** this regard,various techniques for downscaling 3D printing have been developed based on several methodologies in the past decades to exploit the advantages of 3D printing at the micro/*** development of 3D nanoprinting techniques has provided a method to design unique and sophisticated nanoscale 3D objects enabling functional applications that are thus far constrained with conventional planar nanomanufacturing processes such as photolithography and electron beam ***,the versatile and practical realization of 3D nanoprinting in a broad science and engineering field remains challenging due to limitations such as feature size resolution,suitable materials,and design ***,innovative 3D nanoprinting techniques are required to overcome current *** this Account,we describe our achievements in developing 3D nanoprinting with charged aerosols relying on the physics behind counteracting electric *** introduce the generation of charged aerosols,the most feasible in the broad range of fundamental building blocks(mainly all types of metals and alloys,their oxides,polymers,and organics)for 3D ***,charged aerosols can be processed at ambient conditions *** aerosols could be precisely controlled and delivered for the assembly,using electric fields of complicated configurations despite the Brownian diffusion and other chaotic *** converging electric fields are formed around openings by the interactions of two electric *** of the electric fields comes from a negatively biased *** contrast,the counteracting electric field comes from the positive ions distributed on a prepatterned dielectric layer over the *** a result,the positively charged aerosols are focused through these fields to grow with nanoscale resolution only

关键词： printing aerosol lifting

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Computer simulation of super-magnetoelastic behavior near critical region of magnetic materials based on phase-field method

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稀有金属:英文版 2023年第8期42卷 2477-2488页

作者： Zhao Zhang Cheng-Chao Hu An-Hang Zhou Yu-Xin Xu Yuan-Yuan Wu Hai-Hua Huang Hou-Bing Huang Jun-Jie Ni Wei Li Wei-Feng Rao School of Materials Science and Engineering Liaocheng UniversityLiaocheng 252059China Advanced Research Institute of Multidisciplinary Science Beijing Institute of TechnologyBeijing 100081China School of mechanical Engineering Qilu University of Technology(Shandong Academy of Sciences)Jinan 250353China Shandong Institute of mechanical design and Research Jinan 250031China

Since the discovery of ferromagnetic morphotropic phase boundary(MPB)in 2010,the connotation and extension of MPB have been becoming more and more *** the last dozen years,much experimental work has been done to design magnetostrictive materials based on the MPB ***,due to the difficulty in direct experimental observations and the complexity of theoretical treatments,the insight into the microstructure property relationships and underlying mechanisms near the ferromagnetic MPB has not been fully ***,we have reviewed our recent computer simulation work about the super-magnetoelastic behavior near the critical region of several typical ***-field modeling and simulation are employed to explore the domain configuration and engineering in single crystals as well as the grain size effect in ***,a general nano-embryonic mechanism for superelasticity is also ***,some future perspectives and challenges are presented to stimulate a deeper consideration of the research paradigm between multiscale modeling and material development.

关键词： Super-magnetoelastic behavior Phase-field simulation Morphotropic phase boundary(MPB)

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Self-consistent Clustering Analysis-Based Moving Morphable Component(SMMC)Method for multiscale Topology Optimization

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Acta Mechanica Solida Sinica 2023年第6期36卷 884-898页

作者： Yangfan Li Jiachen Guo Hengyang Li Huihan Chen Department of mechanical Engineering Northwestern UniversityEvanstonIL 60208USA Theoretical and Applied Mechanics program Northwestern UniversityEvanstonIL 60208USA Department of Engineering Mechanics Tsinghua UniversityBeijing 100084China

Current multiscale topology optimization restricts the solution space by enforcing the use of a few repetitive microstructures that are predetermined,and thus lack the ability for structural concerns like buckling strength,robustness,and ***,in this paper,a new multiscale concurrent topology optimization design,referred to as the self-consistent analysis-based moving morphable component(SMMC)method,is *** with the conventional moving morphable component method,the proposed method seeks to optimize both material and structure simultaneously by explicitly designing both macrostructure and representative volume element(RVE)-level *** examples with transducer design requirements are provided to demonstrate the superiority of the SMMC method in comparison to traditional *** proposed method has broad impact in areas of integrated industrial manufacturing design:to solve for the optimized macro and microstructures under the objective function and constraints,to calculate the structural response efficiently using a reduced-order model:self-consistent analysis,and to link the SMMC method to manufacturing(industrial manufacturing or additive manufacturing)based on the design requirements and application areas.

关键词： Topology optimization Moving morphable component method multiscale concurrent design Reduced-order model

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Thermal Response Variability of Random Polycrystalline Microstructures

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Communications in Computational Physics 2011年第8期10卷 607-634页

作者： Bin Wen Zheng Li Nicholas Zabaras Materials Process design and Control Laboratory Sibley School of Mechanical and Aerospace EngineeringCornell UniversityIthacaNY 14853-3801USA State Key Laboratory of Structural Analysis for Industrial Equipment Faculty of Vehicle Engineering and MechanicsDalian University of TechnologyDalian 116024China

A data-driven model reduction strategy is presented for the representation of random polycrystal *** a set of microstructure snapshots that satisfy certain statistical constraints such as given low-order moments of the grain size distribution,using a non-linear manifold learning approach,we identify the intrinsic low-dimensionality of the microstructure *** addition to grain size,a linear dimensionality reduction technique(Karhunun-Lo´eve Expansion)is used to reduce the texture *** space of viable microstructures is mapped to a low-dimensional region thus facilitating the analysis and design of polycrystal *** methodology allows us to sample microstructure features in the reduced-order space thus making it a highly efficient,low-dimensional surrogate for representing microstructures(grain size and texture).We demonstrate the model reduction approach by computing the variability of homogenized thermal properties using sparse grid collocation in the reduced-order space that describes the grain size and orientation variability.

关键词： Non-linear model reduction polycrystalline microstructure homogenization microstructure reconstruction stochastic analysis Karhunun-Lo´eve Expansion multiscale modeling heat conduction

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