Prepregs with discontinuous resin patterns facilitate air removal and impart robustness to vacuum-bag-only processing of composites. However, optimal pattern characteristics have not yet been identified. A geometric model was developed to guide the fabrication of prepregs with various discontinuous patterns and laminates with different orientations and ply counts. The model was used to evaluate metrics related to gas transport: projected surface area exposed, sealed interfaces, and tortuosity. Statistical analysis revealed that single layer surface area exposed and ply count had the greatest effect on projected surface area exposed; orientation had the greatest effect on sealed interfaces and tortuosity. From these insights, prototype prepregs were fabricated to measure through-thickness permeability. Prepregs with a large percentage of sealed interfaces and high tortuosity exhibited lower permeability. The study demonstrated a methodology to differentiate/screen patterns for gas transport efficiency. The model can guide prepreg design and support robust production of composites via out-of-autoclave manufacturing.

具有不连续树脂图案的预浸料有助于去除空气并赋予复合材料纯真空袋加工以坚固性。但是，尚未确定最佳图案特征。开发了几何模型，以指导制造具有各种不连续图案的预浸料以及具有不同方向和层数的层压板。该模型用于评估与气体传输有关的度量标准：暴露的预计表面积，密封的界面和曲折度。统计分析表明，暴露的单层表面积和层数对暴露的投影表面积影响最大；取向对密封界面和曲折度影响最大。从这些见解中，可以制得原型预浸料，以测量厚度通透性。具有大量密封界面和高曲折度的预浸料显示出较低的渗透性。这项研究证明了区分/筛选气体传输效率模式的方法。该模型可以指导预浸料的设计，并通过高压釜制造来支持复合材料的稳健生产。