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Area of Science:

  • Materials Science
  • Mechanical Engineering
  • Robotics

Background:

  • Advances in shape-morphing materials allow for self-directed deformations of flat geometries.
  • Current methods often lack temporal control, limiting achievable complexity and risking self-collisions.
  • Existing time-dependent morphing solutions are restricted to simple hinges and cannot create doubly curved surfaces.

Purpose of the Study:

  • To demonstrate a method for encoding temporal shape evolution in architected shells.
  • To enable the formation of complex shapes and doubly curved geometries with controlled time-dependent actuation.
  • To develop an inverse design tool for predicting and controlling unit cell temporal responses.

Main Methods:

  • Utilizing non-periodic tessellations of pre-stressed contractile unit cells.
  • Designing unit cells whose softening rate in water is locally controlled by mesostructure geometry.
  • Coupling midplane contraction to the formation of encoded curvatures for shape transformation.

Main Results:

  • Successfully encoded temporal shape evolution in architected shells.
  • Demonstrated the ability to form complex shapes and doubly curved geometries.
  • Developed a data-driven inverse design tool for unit cells' temporal responses.

Conclusions:

  • The proposed method enables precise spatial and temporal control over shell morphing.
  • This approach overcomes limitations of existing shape-morphing technologies, allowing for more complex designs.
  • The inverse design tool facilitates the creation of architected shells with predictable, time-dependent shape transformations.