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Strain Sensing Based on Multiscale Composite Materials Reinforced with Graphene Nanoplatelets
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A highly stretchable double-network composite.

Xiangchao Feng1, Zhuo Ma1, Jonathan V MacArthur1

  • 1Department of Aerospace Engineering, Iowa State University, Ames, IA 50011, USA. whong@iastate.edu.

Soft Matter
|October 8, 2016
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A new soft composite material mimics double-network (DN) hydrogels, achieving superior strength and toughness through a damage delocalization mechanism. This fabric and VHB tape composite offers tunable mechanical properties and insights into DN gel toughening.

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Area of Science:

  • Materials Science
  • Polymer Science
  • Mechanics of Materials

Background:

  • Double-network (DN) hydrogels exhibit remarkable toughness due to their unique network structure.
  • Understanding toughening mechanisms in soft materials is crucial for developing advanced composites.
  • Fabric mesh and VHB tape are common materials with distinct mechanical properties.

Purpose of the Study:

  • To fabricate a soft composite inspired by DN hydrogels.
  • To investigate the mechanical properties, specifically strength and toughness, of the composite.
  • To elucidate the damage delocalization mechanism responsible for the enhanced properties.

Main Methods:

  • Fabrication of a composite material using fabric mesh and VHB tape layers.
  • Mechanical testing, including uniaxial tension and cyclic loading.
  • Development and application of a 1D model to simulate damage evolution.

Main Results:

  • The composite exhibited stiffness comparable to fabric and stretchability similar to VHB tape.
  • Certain compositions showed significantly enhanced strength and toughness compared to individual components.
  • A damage delocalization mechanism, involving fragmented fabric islands within stretched VHB, was identified.
  • Stable necking and stress hysteresis were observed, analogous to DN gels.
  • A 1D model accurately predicted the composite's properties.

Conclusions:

  • The soft composite effectively replicates the toughening mechanism of DN hydrogels.
  • The damage delocalization mechanism provides a pathway to superior mechanical performance.
  • The composite serves as a macroscopic model for studying DN gel properties.
  • The developed model aids in understanding and predicting the behavior of such composites.