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Dynamic response of auxetic structures

John Kennedy, Matthieu Proffit
2020 Vibroengineering PROCEDIA  
We will present a novel design that facilitates 3D printing with SLA printers and then examine the dynamic behavior of an auxetic structure between 0 and 1 kHz.  ...  In order to explain the unusual behavior of the structure, an initial theoretical model of non-linear spring has been developed with partial success.  ...  Novel structure This design varies from the usual design used in previous studies as it has been developed to be 3D printed on an SLA printer.  ... 
doi:10.21595/vp.2020.21440 fatcat:73r2u3dqhvbjfh3tzdnutblaka

Structural Optimization of Adaptive Soft Fin Ray Fingers with Variable Stiffening Capability

Khaled Elgeneidy, Adel Fansa, Irfan Hussain, Khaled Goher
2020 2020 3rd IEEE International Conference on Soft Robotics (RoboSoft)  
This paper investigates the structural optimization of adaptive soft fingers based on the Fin Ray® effect (Soft Fin Ray), featuring a passive stiffening mechanism that is enabled via layer jamming between  ...  deforming flexible ribs.  ...  This is investigated in the next section by developing an accurate finite element model of the Soft FRE finger that effectively captures its deformation behavior, so that a range of structural variations  ... 
doi:10.1109/robosoft48309.2020.9115969 dblp:conf/robosoft/ElgeneidyFHG20 fatcat:yv5bkcropnelhnrkfkzy4m5sl4

Mechanical Models, Structures, and Applications of Shape-Memory Polymers and Their Composites

Xiaozhou Xin, Liwu Liu, Yanju Liu, Jinsong Leng
2019 Acta Mechanica Solida Sinica  
In addition, the deformation types of 4D printing structures and the potential applications of this technology in robots and medical devices are also summarized.  ...  , such as hinges, beams, and antennae based on SMPCs.  ...  Open Access This article is distributed under the terms of the Creative Commons Attribution 4.0 International License (, which permits unrestricted use, distribution  ... 
doi:10.1007/s10338-019-00103-9 fatcat:7aihiita3nhqfkpilnokpsa34y

Deformation Resilient Cement Structures using 3D-Printed Molds

Seyed Mohammad Sajadi, Chandra Shekhar Tiwari, Amir Hossein Rahmati, Shannon L. Eichmann, Carl J. Thaemlitz, Devashish Salpekar, Anand B. Puthirath, Peter J. Boul, Muhammad M. Rahman, Meiyazhagan AshokKumar, Pulickel M. Ajayan
2021 iScience  
Here, we develop complex architectures of cementitious materials using an inverse replica approach where a soft polymer phase emerges as an external conformal coating.  ...  These polymer-coated architected cementitious structures display unusual mechanical behavior with considerably higher toughness compared to conventional non-porous structures.  ...  Supplemental Figures and Tables CT scans were collected to visualize the 3D cement structure and provide an initial check for polymer coating.  ... 
doi:10.1016/j.isci.2021.102174 pmid:33718827 pmcid:PMC7921815 fatcat:d7ojb2xccnhkvjnmhk53xvn6b4

Hinges for origami-inspired structures by multimaterial additive manufacturing

Marius A. Wagner, Jian-Lin Huang, Philipp Okle, Jamie Paik, Ralph Spolenak
2020 Materials & design  
In this study, we focus on testing and characterizing mechanical properties of flexural hinges so that our findings could have immediate applications in 3D-printed origami structures.  ...  We investigate the impact of the materials and geometric design parameters on the load carrying capability and flexural properties.  ...  This study is part of the strategic focus area advanced manufacturing project Sustainable Design of 4D Printed Active Systems (SD4D).  ... 
doi:10.1016/j.matdes.2020.108643 fatcat:otikuh662jal3ifpfcilqsgr3e

Mechanical Characterization and Finite Element Analysis of Hierarchical Sandwich Structures with PLA 3D-Printed Core and Composite Maize Starch Biodegradable Skins

Maria Zoumaki, Michel T. Mansour, Konstantinos Tsongas, Dimitrios Tzetzis, Gabriel Mansour
2022 Journal of Composites Science  
The investigated sandwich structures consist of maize starch-based films as skins and biodegradable 3D-printed polylactic filaments (PLA) as the core.  ...  Three orders of hierarchical honeycombs were designed for the 3D-printed core.  ...  A structural FE analysis based on the ANSYS code was utilized to investigate the deformation process of 3D-printed bending honeycomb structures and extract a constitutive model of their mechanical behavior  ... 
doi:10.3390/jcs6040118 fatcat:mwlt67wmure63kmo4hbm4vqwum

Computational Design and Simulation of Bending-Active Auxetic Structures

Roberto Naboni, Lorenzo Mirante
2016 Gestão & Tecnologia de Projetos  
Explora-se um novo campo de pesquisa e design onde diferentes arranjos de auxéticos são estudados com intuito de informar um processo de form-finding de estruturas de cascas nervuradas sinclásticas de  ...  We also express our gratitude to KLONER 3D which provided the fundamental fabrication equipment to develop this work.  ...  Pattern comparison A Through this computational approach, a set of 3D-printed samples have been designed and tested showing typical in-plane auxetic behaviour.  ... 
doi:10.11606/gtp.v11i2.118141 fatcat:hrhv2x3fhvc47gpapgh55lzgdm

Review of modeling electrostatically actuated microelectromechanical systems

R C Batra, M Porfiri, D Spinello
2007 Smart materials and structures (Print)  
This work presents an overview of models for electrostatically actuated MEMSs.  ...  Three-dimensional nonlinear formulations for the coupled electromechanical fluid-structure interaction problem are outlined.  ...  An applied DC voltage is used to induce displacements of the deformable body, and a consequent change in the system capacitance.  ... 
doi:10.1088/0964-1726/16/6/r01 fatcat:pnccdaaigbbpdbrkr6qov665ea

On the application of additive manufacturing methods for auxetic structures: a review

Athul Joseph, Vinyas Mahesh, Dineshkumar Harursampath
2021 Advances in Manufacturing  
AM is a layer-wise manufacturing process and builds the structure as per the designed geometry with appreciable precision and accuracy.  ...  Hence, it is extremely beneficial to fabricate auxetic structures using AM, which is otherwise a tedious and expensive task.  ...  The material used was a silicone-based rubber fabricated using 3D printing along with support structures.  ... 
doi:10.1007/s40436-021-00357-y pmid:34188969 pmcid:PMC8223767 fatcat:vmk57i3pefhxbp2zvayo3ahexa

Shape fidelity and structure of 3D printed high consistency nanocellulose

Ville Klar, Jaakko Pere, Tuomas Turpeinen, Pyry Kärki, Hannes Orelma, Petri Kuosmanen
2019 Scientific Reports  
Particular emphasis is placed on quantitative shape analysis based on 3D scanning, point cloud analysis, and x-ray microtomography.  ...  Despite substantial volumetric as well as anisotropic deformation, we demonstrate repeatability of the printed construct and its properties.  ...  Acknowledgements This work was conducted as part of the Design Driven Value Chains in the World of Cellulose (DWoC) project.  ... 
doi:10.1038/s41598-019-40469-x pmid:30846757 pmcid:PMC6405753 fatcat:ijsm7rlygvgave2nwzchyu2r6i

Experimental and Computational Investigation of Lattice Sandwich Structures Constructed by Additive Manufacturing Technologies

Nikolaos Kladovasilakis, Paschalis Charalampous, Konstantinos Tsongas, Ioannis Kostavelis, Dimitrios Tzetzis, Dimitrios Tzovaras
2021 Journal of Manufacturing and Materials Processing  
The next trend in mechanical engineering design is the adaption of design strategies that build products with lightweight lattice geometries like sandwich structures.  ...  More specifically, Material Jetting Printing (MJP) and Fused Filament Fabrication (FFF) processes were employed to investigate the performance of Acrylonitrile Butadiene Styrene (ABS) lightweight lattice  ...  Acknowledgments: We acknowledge the support of this work by the project "Intelligent και Automated Systems for enabling the Design, Simulation, and Development of Integrated Processes and Products-ODYSSEAS  ... 
doi:10.3390/jmmp5030095 fatcat:ihsibcq2hjctxjmboef4xyu624

Typical dielectric elastomer structures: dynamics and application in structural vibration control

Zhi-long Huang, Xiao-ling Jin, Rong-hua Ruan, Wei-qiu Zhu
2016 Journal of Zhejiang University: Science A  
In the application for vibration control, stack-type and tubular-type DE structures usually used as actuators are surveyed.  ...  In the present paper, the theoretical and experimental research into the dynamical behavior of DE structures and their application for vibration control is reviewed.  ...  To design the feedback controller, the linear model of the actuator is determined based on experimental results using the least mean square estimation.  ... 
doi:10.1631/jzus.a1500345 fatcat:fx7qf5nfdraihpiu6acue3fbva

3D metallic glass cellular structures

Ze Liu, Wen Chen, Josephine Carstensen, Jittisa Ketkaew, Rodrigo Miguel Ojeda Mota, James K. Guest, Jan Schroers
2016 Acta Materialia  
3D Metallic glass structures (3DMGs) are fabricated through thermoplastic forming (TPF)-based patterning of MG sheets combined with a parallel joining technique.  ...  elasticity of up to 40% loading strain, high elastic energy storability, and high energy absorption which is superior compared to those made from other materials such as conventional metals and ceramics, based  ...  Recently, 3D printing [45] has offered a novel approach to designing and manufacturing three-dimensional complex parts from polymers, metals, and ceramics. 3D printing to fabricate BMG cellular structures  ... 
doi:10.1016/j.actamat.2015.11.057 fatcat:uplynzlkcrhcjptvdrut4hrlqa

Fingertip Fiber Optical Tactile Array with Two-Level Spring Structure

Jelizaveta Konstantinova, Agostino Stilli, Kaspar Althoefer
2017 Sensors  
This paper presents the design of an integrated fingertip force sensor employing an optical fiber based approach where applied forces modulate light intensity.  ...  The force measurement of a single tactile element is based on a two-level displacement that is achieved thanks to a hybrid sensing structure made up of a stiff linear and flexible ortho-planar spring.  ...  The Young's modulus of the ortho-planar spring is fixed in our case, as it depends on the used 3D printing material.  ... 
doi:10.3390/s17102337 pmid:29027920 pmcid:PMC5677244 fatcat:y2ok4h3vt5e2pmg42lztdcjoda

Integrated Design and Simulation of Tunable, Multi-State Structures Fabricated Monolithically with Multi-Material 3D Printing

Tian Chen, Jochen Mueller, Kristina Shea
2017 Scientific Reports  
Multi-material 3D printing has created new opportunities for fabricating deployable structures.  ...  By flipping the initial configuration of the unit actuators, structures such as a dome and an enclosure are demonstrated.  ...  Each design has a flat initial state and is printed with a multi-material 3D printer.  ... 
doi:10.1038/srep45671 pmid:28361891 pmcid:PMC5374496 fatcat:kol2aeb2mfb5lplz5bncps633i
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