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Pushing and Pulling on Ropes: Hierarchical Woven Materials.

Widianto P Moestopo1, Arturo J Mateos1, Ritchie M Fuller2

  • 1Division of Engineering and Applied Science California Institute of Technology Pasadena CA 91125 USA.

Advanced Science (Weinheim, Baden-Wurttemberg, Germany)
|October 26, 2020
PubMed
Summary

A novel woven hierarchical architecture significantly enhances material properties. This design enables unprecedented deformability and damage resistance in architected materials, overcoming limitations of traditional structures.

Keywords:
architected materialsextensible materialsresilient materialstensile responseswoven lattices

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Area of Science:

  • Materials Science and Engineering
  • Mechanical Engineering
  • Additive Manufacturing

Background:

  • Hierarchical structures in materials impart unique properties not achievable by constituent components alone.
  • Existing 3D architected materials with beam-and-junction designs exhibit limitations due to stress concentrations at junctions, hindering mechanical performance.

Purpose of the Study:

  • To introduce and investigate a new hierarchical architecture utilizing interwoven fibers to create effective beams.
  • To demonstrate the superior mechanical properties of this novel woven architecture compared to traditional monolithic designs.

Main Methods:

  • Additive manufacturing of 30 µm unit cell woven and monolithic lattices.
  • In situ tension and compression experiments to evaluate mechanical behavior.
  • Cyclic compression tests to assess material damage accumulation.
  • Numerical simulations to explore design spaces and material compliance.

Main Results:

  • Woven architectures achieved high tensile and compressive strains (>50%) without failure, attributed to microfiber reconfiguration.
  • Woven lattices exhibited significantly less damage accumulation under cyclic compression compared to monolithic lattices.
  • Numerical studies revealed new design possibilities for tailored compliance in architected materials.

Conclusions:

  • The woven hierarchical design provides a pathway to enhance the deformability of stiff and brittle materials.
  • This approach introduces a versatile building block for developing 3D architected materials with complex nonlinear mechanical responses.
  • The study highlights the potential of interwoven fiber architectures for advanced material design.