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Understanding interfacial fracture behavior between microinterlocked soft layers using physics-based cohesive zone

Navajit S Baban1,2, Ajymurat Orozaliev1, Christopher J Stubbs3

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This summary is machine-generated.

Engineered microinterlocks significantly enhance adhesion strength in polydimethylsiloxane (PDMS) layers, mimicking human skin. This fracture mechanics study offers insights for designing advanced sutureless skin grafts and electronic skin applications.

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Area of Science:

  • Materials Science
  • Biomedical Engineering
  • Mechanical Engineering

Background:

  • Human skin's dermal-epidermal layer features microinterlocks crucial for adhesion.
  • Understanding fracture mechanics of these microinterlocks is key for biomimetic material design.
  • Existing models often simplify interface behavior, lacking microinterlock specific analysis.

Purpose of the Study:

  • To investigate the fracture mechanics of microinterlocks in polydimethylsiloxane (PDMS) layers.
  • To quantify the adhesion enhancement provided by microinterlocks with and without undercuts.
  • To elucidate the crack propagation mechanisms within microinterlocked structures.

Main Methods:

  • Fabrication of PDMS microstructures (spherical, ≈50μm radius) with and without undercuts using microfabrication techniques.
  • Experimental peel tests to measure adhesion strength of fabricated PDMS layers.
  • Physics-based cohesive zone finite-element modeling to simulate microinterlock fracture behavior.

Main Results:

  • Microinterlocks, especially with undercuts, significantly increased adhesion strength (≈4-fold and ≈5-fold, respectively) compared to plain PDMS.
  • Cohesive zone modeling revealed crack arrest and secondary crack initiation at microinterlocks, unlike catastrophic fracture in plain interfaces.
  • Microinterlocks with undercuts showed significantly lower strain energy dissipation.

Conclusions:

  • Microinterlocks enhance adhesion by altering crack propagation pathways, consistent with the Cook-Gordon mechanism.
  • The study provides critical insights into the fracture mechanics of soft microinterlocks.
  • Findings support the rational design of advanced materials like sutureless skin grafts and electronic skin.