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Localized tension-induced giant folding in unstructured elastic sheets.
Kexin Guo1, Marc Suñé2, Ming Li Kwok1
1School of Mechanical and Aerospace Engineering, Nanyang Technological University, Singapore 639798, Singapore.
Summary
Localized tension-induced giant (TUG) folding causes large transverse folding in unstructured sheets under longitudinal tension. This phenomenon, driven by efficient load transfer, offers new possibilities for material and structural design.
Area of Science:
- Mechanics of Materials
- Elastic Instability
- Geometric Mechanics
Background:
- Buckling in compression is a classic example of elastic instability in thin structures.
- Recent research shows tension can induce out-of-plane deformation in structured sheets, with applications in morphing structures and grippers.
Purpose of the Study:
- To demonstrate and investigate counterintuitive out-of-plane folding in unstructured isotropic sheets under localized longitudinal tension.
- To introduce and define "localized tension-induced giant (TUG) folding".
Main Methods:
- Experimental observation of folding behavior in response to localized tension.
- Computational simulations to analyze the underlying mechanics.
- Derivation of scaling laws for folding angle versus applied strain.
Main Results:
- Localized uniaxial tension induces significant out-of-plane folding (TUG folding) in unstructured isotropic sheets.
- This folding arises from an efficient geometric transfer of tensile load into compression.
- Scaling results for folding angle match experimental and simulation data.
Conclusions:
- Localized TUG folding is a generic phenomenon occurring in unstructured materials under specific tensile loading.
- The mechanism relies on geometric load redistribution, not material microstructure.
- This finding broadens the potential applications of tension-induced folding across various materials and structures.
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