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Connected morphable components-based multiscale topology optimization

Frontiers of Mechanical Engineering 2019年第2期14卷 129-140页

作者： Jiadong DENG Claus B.W.PEDERSEN Wei CHEN Department of Mechanical Engineering Northwestern UniversityEvanstonIL 60208USA Dassault Systemes Deutschland GmbH 200095 HamburgGermany

The advances of manufacturing techniques,such as additive manufacturing,have provided unprece-dented opportunities for producing multiscale structures with intricate latticed/cellular material microstructures to meet the increasing demands for parts with customized ***,there are still difficulties for the state-of-the-art multiscale topology optimization(TO)methods to achieve manufacturable multiscale designs with cellular materials,partially due to the disconnectivity issue when tiling material *** paper attempts to address the disconnectivity issue by extending component-based TO methodology to multiscale structural *** effective linkage scheme to guarantee smooth transitions between neighboring material microstructures(unit cells)is devised and *** with the advantages of components-based TO,the number of design variables is greatly reduced in multiscale TO *** is employed to calculate the effective material properties of the porous materials and to correlate the macro/structural scale with the micro/material *** of the objective function with respect to the geometrical parameters of each component in each material microstructure have been derived using the adjoint *** examples demonstrate that multiscale structures with well-connected material microstructures or graded/layered material microstructures are realized.

关键词： multiscale topology optimization morphable component material microstructure homogenization

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Recent progress of morphable 3D mesostructures in advanced materials

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Journal of Semiconductors 2020年第4期41卷 53-65页

作者： Haoran Fu Ke Bai Yonggang Huang Yihui Zhang Institute of Flexible Electronic Technology of Tsinghua ZhejiangJiaxing 314006China Center for Mechanics and Materials and Center for Flexible Electronics Technology AMLDepartment of Engineering MechanicsTsinghua UniversityBeijing 100084China Departments of Civil and Environmental Engineering Mechanical Engineeringand Materials Science and EngineeringNorthwestern UniversityEvanstonIL60208USA

Soft robots complement the existing efforts of miniaturizing conventional,rigid robots,and have the potential to revolutionize areas such as military equipment and biomedical *** type of system can accomplish tasks in complex and time-varying environments through geometric reconfiguration induced by diverse external stimuli,such as heat,solvent,light,electric field,magnetic field,and mechanical *** to achieve reconfigurable mesostructures are essential to the design and fabrication of soft *** studies mainly focus on four key aspects:reconfiguration mechanisms,fabrication schemes,deformation control principles,and practical *** review presents a detailed survey of methodologies for morphable mesostructures triggered by a wide range of stimuli,with a number of impressive examples,demonstrating high degrees of deformation complexities and varied *** latest progress based on the development of new materials and unique design concepts is *** outlook on the remaining challenges and open opportunities is provided.

关键词： morphable mesostructures reconfiguration stimuli

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Isogeometric topology optimization based on energy penalization for symmetric structure

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Frontiers of Mechanical Engineering 2020年第1期15卷 100-122页

作者： Xianda XIE Shuting WANG Ming YE Zhaohui XIA Wei ZHAO Ning JIANG Manman XU School of Mechanical Science and Engineering Huazhong University of Science and TechnologyWuhan 430074China Guangzhou Huagong Motor Vehicle Inspection Technology Co. Ltd.Guangzhou 510640China National Engineering Research Center of Near-Net-Shape Forming for Metallic Materials South China University of TechnologyGuangzhou 510641China Guangdong Provincial Key Laboratory of Technique and Equipment for Macromolecular Advanced Manufacturing South China University of TechnologyGuangzhou 510641China

We present an energy penalization method for isogeometric topology optimization using moving morphable components(ITO–MMC),propose an ITO–MMC with an additional bilateral or periodic symmetric constraint for symmetric structures,and then extend the proposed energy penalization method to an ITO–MMC with a symmetric *** energy penalization method can solve the problems of numerical instability and convergence for the ITO–MMC and the ITO–MMC subjected to the structural symmetric constraint with asymmetric *** optimization problems of asymmetric,bilateral symmetric,and periodic symmetric structures are discussed to validate the effectiveness of the proposed energy penalization *** with the conventional ITO–MMC,the energy penalization method for the ITO–MMC can improve the convergence rate from 18.6%to 44.5%for the optimization of the asymmetric *** the ITO–MMC under a bilateral symmetric constraint,the proposed method can reduce the objective value by 5.6%and obtain a final optimized topology that has a clear boundary with decreased *** the ITO–MMC under a periodic symmetric constraint,the proposed energy penalization method can dramatically reduce the number of iterations and obtain a speedup of more than 2.

关键词： topology optimization moving morphable component isogeometric analysis energy penalization method symmetric constraint

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