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Simulation and Experimental Study on the Internal Leak Behavior in Carbon Fiber Reinforced Composite Components.

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Helium gas diffusion in composite materials was studied. Higher leak rates were observed at the fiber-resin interface, with leaks increasing with pressure and decreasing with thickness.

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Area of Science:

  • Materials Science
  • Composite Materials
  • Gas Diffusion

Background:

  • Understanding gas diffusion in composite materials is crucial for predicting component lifespan and performance.
  • Composite materials, particularly carbon fiber composites, are widely used in various industries due to their strength and lightweight properties.
  • Permeability is a key factor influencing the long-term behavior and integrity of composite structures.

Purpose of the Study:

  • To investigate the diffusion law of helium gas within composite materials.
  • To analyze the impact of fiber and fiber-resin interfaces on gas permeability.
  • To develop and validate a homogenized model for simulating leak rates in carbon fiber composite components.

Main Methods:

  • Numerical research using a detailed numerical model to simulate gas diffusion.
  • Experimental approach to validate numerical findings and model accuracy.
  • Establishment of a homogenized model for efficient leak rate simulation.

Main Results:

  • The leak rate and mass concentration of helium gas were found to be higher at the fiber-resin interface compared to the bulk resin.
  • Leak rate distribution was symmetrical along the horizontal central line.
  • The developed homogenized model accurately predicted leak rates, validated by experimental and numerical data.
  • Leak rate increased with applied pressure and decreased with specimen thickness.

Conclusions:

  • The fiber-resin interface significantly influences helium gas diffusion in composite materials.
  • The homogenized model provides an accurate and efficient tool for simulating leak rates in carbon fiber composites.
  • The findings are critical for designing and assessing the durability of composite components under various pressure and thickness conditions.