Forming three-dimensional closed shapes from two-dimensional soft ribbons by controlled buckling.

Area of Science:

• Materials Science
• Mechanical Engineering
• Physics

Background:

• Conventional manufacturing methods like molding, machining, and casting are unsuitable for residential settings and processing soft elastic materials.
• There is a need for inexpensive, versatile fabrication techniques applicable to soft elastic materials in non-industrial environments.

Purpose of the Study:

• To introduce and characterize a new method for forming three-dimensional (3D) closed hollow shapes from two-dimensional (2D) elastic ribbons using controlled buckling.
• To explore how ribbon geometry influences the resulting buckled shapes.
• To demonstrate the fabrication of complex hollow structures through strategic design.

Main Methods:

• Numerical simulations and experimental characterization of elastic ribbon buckling.
• Finite-element analysis to understand the nonlinear post-buckling behavior.
• Design and fabrication of 2D elastic ribbons with specific profiles and patterns.

Main Results:

• A 2D master profile was identified for creating various elliptical 3D shapes.
• Complex hollow structures (e.g., strawberry, hourglass, wheel) were successfully fabricated.
• Finite-element analysis results showed good quantitative agreement with experimental observations.

Conclusions:

• Controlled buckling of 2D elastic ribbons provides a robust and versatile method for fabricating 3D hollow structures.
• This technique complements traditional manufacturing and opens avenues for studying elastic mechanics and applications.
• The method is suitable for creating complex shapes from soft elastic materials in accessible settings.