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<p>The vacuum-assisted resin transfer molding (VARTM) process has been widely used for decades due to its cost-effectiveness and accessibility in composite manufacturing. It is particularly valued in the aeronautics industry, where weight reduction is crucial. VARTM is preferred over conventional methods like resin transfer molding (RTM) and autoclave due to its higher productivity and lower costs. However, while VARTM produces complex, lightweight structures suitable for mass production, voids, and fiber misalignment can affect the composite’s strength, making it essential to account for these defects in the design process. This work presents the manufacturing process simulation of a three-layer composite slab with different fiber characteristics. Ansys Fluent 2023R2 was used after validation with steady-state and transient data from the literature within ±10%. The three-layer composite slab has two outer layers of filler material (high porosity and permeability) with low mechanical resistance and an inner layer of reinforced fiber (low porosity and permeability). This inner layer is responsible for providing the composite slab with the desired mechanical characteristics. The simulation of the resin transfer process using vacuum (VARTM) revealed the occurrence of a striation pattern in the inner fiber layer that can be detrimental to the mechanical characteristics of the final product.</p>

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Advances in modeling and simulation flow dynamics in vacuum assistant resin transfer molding process for composite structures

  • 期刊论文

  • 发表日期：

    2025年2月13日

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  • Karla Beatriz Vivian Silveira,
  • Marcus Vinícius Canhoto Alves,
  • Ricardo De Medeiros

摘要

The vacuum-assisted resin transfer molding (VARTM) process has been widely used for decades due to its cost-effectiveness and accessibility in composite manufacturing. It is particularly valued in the aeronautics industry, where weight reduction is crucial. VARTM is preferred over conventional methods like resin transfer molding (RTM) and autoclave due to its higher productivity and lower costs. However, while VARTM produces complex, lightweight structures suitable for mass production, voids, and fiber misalignment can affect the composite’s strength, making it essential to account for these defects in the design process. This work presents the manufacturing process simulation of a three-layer composite slab with different fiber characteristics. Ansys Fluent 2023R2 was used after validation with steady-state and transient data from the literature within ±10%. The three-layer composite slab has two outer layers of filler material (high porosity and permeability) with low mechanical resistance and an inner layer of reinforced fiber (low porosity and permeability). This inner layer is responsible for providing the composite slab with the desired mechanical characteristics. The simulation of the resin transfer process using vacuum (VARTM) revealed the occurrence of a striation pattern in the inner fiber layer that can be detrimental to the mechanical characteristics of the final product.