Bertoldi Group
Materials and Structures by Design

Welcome
Welcome to the Bertoldi Group at Harvard University. In our research, we combine theoretical, computational and experimental methods to gain deeper insight into the non-linear behavior of materials and structures. Guided by theoretical and numerical analysis, we exploit material and geometric non-linearities to design novel materials with tunable exceptional properties, and we seek to create and test such materials.
Open Positions
The Bertoldi Group currently has no openings. Check this space for future opportunities.
Recent Publications
- Kamp LM, Zanaty M, Zareei A, Gorissen B, Wood RJ, and Bertoldi K.  Reprogrammable sequencing for physically intelligent underactuated robots. Proceedings of the National Academy of Sciences. 2025 :e2508310122. Reprogrammable sequencing for physically intelligent underactuated robotsPDFProgramming Robots with Rubber BandsNews ArticleThis Robot Runs on Rubber Bands Only!YouTubeReprogrammable sequencing for physically intelligent underactuated robotsMovies
- Risso G, Pesaresi L, Meeussen AS, Bertoldi K. Conditional stability in metamaterials: Experiments, modeling, and 3D design. Extreme Mechanics Letters. 2025 :102393. Conditional stability in metamaterials: Experiments, modeling, and 3D designPDF
- McCann CM, Arnold J, Lehmacher C, Bertoldi K, Walsh CJ. On-body textile hysteresis estimation for personalized physical human-robot interaction. The International Journal of Robotics Research. 2025 :018202. On-body textile hysteresis estimation for personalized physical human-robot interactionPDF
-  Dudek KK, Kadic M, Coulais C, Bertoldi K. Shape-morphing metamaterials. Nature Reviews Materials. 2025 :1-16. Shape-morphing metamaterialsPDF
- Wilborn AM, Almohammadi H, Qu P, Wang Y, Yang Y, Kay R, Kim D, Bertoldi K, Weitz D, Aizenberg J. Towards Differentiation in Untethered Microactuators: A Soft Fabrication Strategy. Advanced Materials. 2025 :2507273. Towards Differentiation in Untethered Microactuators: A Soft Fabrication StrategyPDFTowards Differentiation in Untethered Microactuators: A Soft Fabrication Strategy MoviesMovies
- Risso G, Isbled M, Melancon D, Bertoldi K. Twisting-Induced Instabilities in Double-Helix Chiral Rods. Physical Review Letters. 2025 :018202. Twisting-Induced Instabilities in Double-Helix Chiral RodsPDFTwisting-Induced Instabilities in Double-Helix Chiral Rods MoviesMovies
 Farrell DT, McCann CM, Forte AE, Walsh CJ, Bertoldi K. Programmable Surface Dimpling of Textile Metamaterials for Aerodynamic Control. Advanced Materials. 2025 :2505817. Farrell DT, McCann CM, Forte AE, Walsh CJ, Bertoldi K. Programmable Surface Dimpling of Textile Metamaterials for Aerodynamic Control. Advanced Materials. 2025 :2505817.- Programmable Surface Dimpling of Textile Metamaterials for Aerodynamic Control- PDF- Programmable Surface Dimpling of Textile Metamaterials for Aerodynamic Control Movies
- Farhadi D, Pernigoni L, Melancon D, Bertoldi K.  Origami Crawlers: Exploring A Single Origami Vertex for Complex Path Navigation. Advanced Materials. 2025 :2502293. Origami Crawlers: Exploring A Single Origami Vertex for Complex Path NavigationPDFA New Design Strategy for Highly Multistable Kirigami MetamaterialsMovies
 Meeussen AS, Corvi A, Bertoldi K. A New Design Strategy for Highly Multistable Kirigami Metamaterials. Advanced Functional Materials. 2024 :2415986. Meeussen AS, Corvi A, Bertoldi K. A New Design Strategy for Highly Multistable Kirigami Metamaterials. Advanced Functional Materials. 2024 :2415986.- A New Design Strategy for Highly Multistable Kirigami Metamaterials- PDF- A New Design Strategy for Highly Multistable Kirigami Metamaterials- Movies
- Ding X, Sanchez V, Bertoldi K, Rycroft CH. Unravelling the mechanics of knitted fabrics through hierarchical geometric representation. Proceedings Royal Society A. 2024;480 :20230753.Unravelling the mechanics of knitted fabrics through hierarchical geometric representationPDF
- Meeussen AS, Bordiga G, Chang AX, Spoettling B, Becker KP, Mahadevan L, Bertoldi K. Textile Hinges Enable Extreme Properties of Kirigami Metamaterials. Advanced Functional Materials. 2024 :2415986. Textile Hinges Enable Extreme Properties of Kirigami MetamaterialsPDFTextile Hinges Enable Extreme Properties of Kirigami MetamaterialsMovies
- Bordiga G, Medina E, Jafarzadeh S, Bösch C, Adams RP, Tournat V, Bertoldi K. Automated discovery of reprogrammable nonlinear dynamic metamaterials. Nature Materials. 2024. Automated discovery of reprogrammable nonlinear dynamic metamaterialsPDFAutomated discovery of reprogrammable nonlinear dynamic metamaterialsMovies
 Yang Y, Read H, Sbai M, Zareei A, Forte AE, Melancon D, Bertoldi K. Complex Deformation in Soft Cylindrical Structures viaProgrammable Sequential Instabilities. Advanced Materials. 2024 :2406611. Yang Y, Read H, Sbai M, Zareei A, Forte AE, Melancon D, Bertoldi K. Complex Deformation in Soft Cylindrical Structures viaProgrammable Sequential Instabilities. Advanced Materials. 2024 :2406611.- Complex Deformation in Soft Cylindrical Structures viaProgrammable Sequential Instabilities- Movies- Complex Deformation in Soft Cylindrical Structures viaProgrammable Sequential Instabilities- PDF
- Mogas-Soldevila L, Duro-Royo J, Lizardo D, Hollyer GG, Settens CM, Cox JM, Overvelde JTB, DiMasi E, Bertoldi K, Weaver JC, et al. Driving macro-scale transformations in three-dimensional-printed biopolymers through controlled induction of molecular anisotropy at the nanoscale. Interface Focus. 2024;14 :20230077. Driving macro-scale transformations in three-dimensional-printed biopolymers through controlled induction of molecular anisotropy at the nanoscalePDF