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Crack path selection in orientationally ordered composites.

A Mesgarnejad1, C Pan2, R M Erb2

  • 1Center for Inter-disciplinary Research on Complex Systems, Department of Physics, Northeastern University, Boston, Massachusetts 02115, USA.

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|August 16, 2020
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Summary
This summary is machine-generated.

Cracks in composites kink rather than propagate straight, enhancing material toughness. Fracture energy anisotropy and microstructure-dependent process zones predict this kinking behavior, influenced by sample geometry and load.

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Area of Science:

  • Materials Science
  • Mechanical Engineering
  • Solid Mechanics

Background:

  • Cracks in isotropic materials propagate straight, perpendicular to tensile stress.
  • Cracks in composites often deflect, increasing material toughness.
  • Understanding crack propagation in composites is crucial for material design.

Purpose of the Study:

  • Identify material properties predicting straight or kinking crack propagation in composites.
  • Investigate the role of fracture energy anisotropy and process zone size.
  • Determine factors influencing the crack kinking threshold.

Main Methods:

  • Combined experimental and computational simulations.
  • Varied fracture energy anisotropy by altering alumina (Al_{2}O_{3}) platelet volume fraction in a polymer matrix.
  • Analyzed microstructure-dependent process zone size and nonsingular stress effects.

Main Results:

  • Identified fracture energy anisotropy and process zone size as key predictors of crack kinking.
  • Demonstrated that increasing alumina content enhances fracture energy anisotropy.
  • Found that process zone size modulates crack stabilizing/destabilizing effects.

Conclusions:

  • Established an anisotropy threshold for crack kinking in composites.
  • Explained the strong dependence of this threshold on sample geometry and load distribution.
  • Provided a framework for predicting and controlling crack behavior in composite materials.