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Microvascular network optimization of self-healing materials using non-dominated sorting genetic algorithm II and

Peng Li1, Genzhu Liu1, Yuan Liu1

  • 1School of Mechatronics & Vehicle Engineering, East China Jiaotong University, Nanchang, China.

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|December 13, 2019
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Summary

This study optimized microvascular networks for self-healing composites, balancing mechanical and repair properties. The optimized design minimizes void fraction and head loss, enhancing material performance.

Keywords:
Hardy Cross iterationNSGA-IISelf-healing materialfinite element analysismicrovascular network

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Area of Science:

  • Materials Science
  • Mechanical Engineering
  • Composite Materials

Background:

  • Self-healing strategies are crucial for extending composite material lifespan by addressing crack defects.
  • Extrinsic self-healing systems, like microvascular networks, offer multi-cycle repair capabilities for extensive damage.
  • Integrating microvascular networks can negatively impact the mechanical performance of the host matrix material.

Purpose of the Study:

  • To optimize the design of microvascular networks for self-healing composites.
  • To minimize head loss and void volume fraction in the microvascular network.
  • To balance the mechanical and self-repairing properties of composite materials.

Main Methods:

  • Non-dominated sorting genetic algorithm II (NSGA-II) was employed for optimization.
  • Finite element analysis and Hardy Cross iteration were used for quantitative analysis of objective functions.
  • Optimized network designs were fabricated and experimentally validated.

Main Results:

  • 165 optimized solutions were generated, with void volume fraction within [4.19%, 5.13%] and head loss within [9.63×10-7 m, 6.51×10-6 m].
  • Experimental validation showed a void volume fraction of 3.77% (lower than the designed 4.43%), indicating minimal impact on the matrix.
  • The fabricated network demonstrated interconnectedness, free flow of healing agent, and no reduction in epoxy resin performance.

Conclusions:

  • The optimization of microvascular networks effectively balances mechanical integrity and self-healing capabilities in composites.
  • The developed microvascular network design is feasible and enhances the overall performance of self-healing materials.
  • This approach provides a pathway for creating more durable and resilient composite structures.