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Bio-inspired interfacial strengthening strategy through geometrically interlocking designs.

Yuming Zhang1, Haimin Yao, Christine Ortiz

  • 1Department of Engineering Mechanics, Shanghai Jiaotong University, Shanghai 200240, China.

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Introducing geometrical interlockers on interfaces enhances biomimetic composite strength. This strategy improves mechanical properties by optimizing stiff and compliant phase junctions, mimicking natural materials.

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Area of Science:

  • Materials Science
  • Biomimetics
  • Mechanical Engineering

Background:

  • Natural composites like nacre and bone exhibit superior strength and toughness due to their organic/inorganic composition.
  • Current synthetic biomimetic composites often fail to achieve comparable property enhancements.
  • Weak interfacial junctions between stiff and compliant phases are a key limitation in synthetic composites.

Purpose of the Study:

  • To propose and investigate an interfacial strengthening strategy for biomimetic composites.
  • To enhance the mechanical properties of synthetic organic/inorganic composites.
  • To provide design guidelines for optimizing composite performance based on natural material structures.

Main Methods:

  • Finite Element Analysis (FEA) was employed to model and analyze composite behavior.
  • The study focused on introducing geometrical interlockers at the interfaces between stiff and compliant phases.
  • Parametric studies evaluated the influence of interlocker geometry (shape, size, hierarchy) on mechanical strength.

Main Results:

  • Composite strength is highly dependent on the geometrical features of the designed interlockers.
  • Even without adhesion or friction, properly designed interlockers can increase tensile strength significantly.
  • Simulations showed potential tensile strength reaching up to 70% of the ideal value with optimized interlockers.

Conclusions:

  • Geometrical interlockers represent an effective strategy for interfacial strengthening in biomimetic composites.
  • Optimizing interlocker design is crucial for maximizing the mechanical performance of synthetic composites.
  • This approach offers a pathway to bridge the performance gap between natural and synthetic organic/inorganic materials.