Now showing items 1-20 of 46

    • A 3D-printed, functionally graded soft robot powered by combustion 

      Bartlett, Nicholas Warren; Tolley, M. T.; Overvelde, Johannes Tesse bastiaan; Weaver, J; Mosadegh, B; Bertoldi, Katia; Whitesides, George McClelland; Wood, Robert J. (American Association for the Advancement of Science (AAAS), 2015)
      Roboticists have begun to design biologically inspired robots with soft or partially soft bodies, which have the potential to be more robust and adaptable, and safer for human interaction, than traditional rigid robots. ...
    • Amplifying the response of soft actuators by harnessing snap-through instabilities 

      Overvelde, Johannes Tesse bastiaan; Kloek, Tamara; D’haen, Jonas J. A.; Bertoldi, Katia (Proceedings of the National Academy of Sciences, 2015)
      Although instabilities have traditionally been avoided as they often represent mechanical failure, here we embrace them to amplify the response of fluidic soft actuators. Besides presenting a robust strategy to trigger ...
    • Bioinspired kirigami metasurfaces as assistive shoe grips 

      Babaee, Sahab; Pajovic, Simo; Rafsanjani, Ahmad; Shi, Yichao; Bertoldi, Katia; Traverso, Giovanni (Springer Science and Business Media LLC, 2020-06-01)
      Falls and subsequent complications are major contributors to morbidity and mortality, especially in older adults. Here, by taking inspiration from claws and scales found in nature, we show that buckling kirigami structures ...
    • Buckling Induced Functionality in Soft Structures 

      Liu, Jia (2016-04-18)
      A variety of instabilities can be triggered when elastic structures are subjected to mechanical loadings. While such instabilities have traditionally been considered as a failure, a new trend is emerging in which the ...
    • Buckling of Elastomeric Beams Enables Actuation of Soft Machines 

      Yang, Dian; Mosadegh, Bobak; Ainla, Alar; Lee, Ben Charles Germain; Khashai, Fatemeh; Suo, Zhigang; Bertoldi, Katia; Whitesides, George McClelland (Wiley-Blackwell, 2015)
      Soft, pneumatic actuators that buckle when interior pressure is less than exterior provide a new mechanism of actuation. Upon application of negative pneumatic pressure, elastic beam elements in these actuators undergo ...
    • Buckling-induced encapsulation of structured elastic shells under pressure 

      Shim, J.; Perdigou, C.; Chen, E. R.; Bertoldi, Katia; Reis, P. M. (Proceedings of the National Academy of Sciences, 2012)
      We introduce a class of continuum shell structures, the Buckliball, which undergoes a structural transformation induced by buckling under pressure loading. The geometry of the Buckliball comprises a spherical shell patterned ...
    • Buckling-Induced Reversible Symmetry Breaking and Amplification of Chirality Using Supported Cellular Structures 

      Kang, Sung Hoon; Shan, Sicong; Noorduin, Wim L.; Khan, Mughees; Aizenberg, Joanna; Bertoldi, Katia (Wiley, 2013)
      Buckling‐induced reversible symmetry breaking and amplification of chirality using macro‐ and microscale supported cellular structures is described. Guided by extensive theoretical analysis, cellular structures are rationally ...
    • Characterization of a Mechanically Tunable Gyroid Photonic Crystal Inspired by the Butterfly Parides Sesostris 

      Pouya, Caroline; Overvelde, Johannes Tesse bastiaan; Kolle, Mathias; Aizenberg, Joanna; Bertoldi, Katia; Weaver, James C.; Vukusic, Pete (Wiley, 2015)
      Dynamically tunable three-dimensional photonic materials offer potential for the development of novel optical technologies. For spectral ranges of interest, however, the systematic and high-throughput characterization of ...
    • A Combined Finite Element-Multiple Criteria Optimization Approach for Materials Selection of Gas Turbine Components 

      Shanian, A.; Milani, Abbas S.; Vermaak, Natasha; Bertoldi, Katia; Scarinci, Tom; Gerendas, Miklos (ASME International, 2012)
      The design of critical components for aerospace applications involves a number of conflicting functional requirements: reducing fuel consumption, cost, and weight, while enhancing performance, operability and robustness. ...
    • Compaction through Buckling in 2D Periodic, Soft and Porous Structures: Effect of Pore Shape 

      Overvelde, Johannes Tesse Bastiaan; Shan, Sicong; Bertoldi, Katia (Wiley Blackwell, 2012)
      Soft cellular structures that comprise a solid matrix with a square array of holes open avenues for the design of novel soft and foldable structures. Our results demonstrate that by simply changing the shape of the holes ...
    • A comparative analysis of numerical approaches to the mechanics of elastic sheets 

      Taylor, Michael; Davidovitch, Benny; Qiu, Zhanlong; Bertoldi, Katia (Elsevier BV, 2015)
      Numerically simulating deformations in thin elastic sheets is a challenging problem in computational mechanics due to destabilizing compressive stresses that result in wrinkling. Determining the location, structure, and ...
    • Complex Ordered Patterns in Mechanical Instability Induced Geometrically Frustrated Triangular Cellular Structures 

      Kang, Sung Hoon; Shan, Sicong; Kosmrlj, Andrej; Noorduin, Wim L.; Shian, Samuel; Weaver, James C.; Clarke, David R.; Bertoldi, Katia (American Physical Society, 2014)
      Geometrical frustration arises when a local order cannot propagate throughout the space because of geometrical constraints. This phenomenon plays a major role in many systems leading to disordered ground-state configurations. ...
    • Differential Contributions of Conformation Extension and Domain Unfolding to Properties of Fibronectin Nanotextiles 

      Deravi, Leila F; Su, Tianxiang; Paten, Jeffrey A.; Ruberti, Jeffrey W.; Bertoldi, Katia; Parker, Kevin Kit (American Chemical Society, 2012)
      Fibronectin (FN) textiles are built as nanometer-thick fabrics. When uniaxially loaded, these fabrics exhibit a distinct threshold between elastic and plastic deformation with increasing stretch. Fabric mechanics are ...
    • Dimpled elastic sheets: a new class of non-porous negative Poisson’s ratio materials 

      Javid, Farhad; Smith-Roberge, Evelyne; Innes, Matthew C.; Shanian, Ali; Weaver, James C.; Bertoldi, Katia (Nature Publishing Group, 2015)
      In this study, we report a novel periodic material with negative Poisson’s ratio (also called auxetic materials) fabricated by denting spherical dimples in an elastic flat sheet. While previously reported auxetic materials ...
    • Discontinuous Buckling of Wide Beams and Metabeams 

      Coulais, Corentin; Overvelde, Johannes Tesse bastiaan; Lubbers, Luuk A.; Bertoldi, Katia; van Hecke, Martin (American Physical Society (APS), 2015)
      We uncover how nonlinearities dramatically alter the buckling of elastic beams. First, we show experimentally that sufficiently wide ordinary elastic beams and specifically designed metabeams ---beams made from a mechanical ...
    • Discoveries in Phononic Crystals and Acoustic Metamaterials 

      Wang, Pai (2015-10-13)
      Phononic crystals and acoustic metamaterials are heterogeneous materials that enable manipulation of elastic waves. An important characteristic of these heterogeneous systems is their ability to tailor the propagation of ...
    • Effects of geometric and material nonlinearities on tunable band gaps and low-frequency directionality of phononic crystals 

      Wang, Pai; Shim, Jongmin; Bertoldi, Katia (American Physical Society (APS), 2013)
      We investigate the effects of geometric and material nonlinearities introduced by deformation on the linear dynamic response of two-dimensional phononic crystals. Our analysis not only shows that deformation can be ...
    • Elastic metamaterials for tuning circular polarization of electromagnetic waves 

      Zárate, Yair; Babaee, Sahab; Kang, Sung H.; Neshev, Dragomir N.; Shadrivov, Ilya V.; Bertoldi, Katia; Powell, David A. (Nature Publishing Group, 2016)
      Electromagnetic resonators are integrated with advanced elastic material to develop a new type of tunable metamaterial. An electromagnetic-elastic metamaterial able to switch on and off its electromagnetic chiral response ...
    • Embracing Compliance and Instabilities to Achieve Function in Mechanical Metamaterials and Devices 

      Overvelde, Johannes (2016-04-26)
      The use of soft materials has led to the development of soft devices that have the potential to be more robust, adaptable, and safer for human interaction than traditional rigid systems. State-of-the-art developments push ...
    • Exploiting pattern transformation to tune phononic band gaps in a two-dimensional granular crystal 

      Göncü, Fatih; Luding, Stefan; Bertoldi, Katia (Acoustical Society of America, 2012)
      The band structure of a two-dimensional granular crystal composed of silicone rubber and polytetrafluoroethylene (PTFE) cylinders is investigated numerically. This system was previously shown to undergo a pattern ...