This study aims to enhance the performance of aircrew helmet liners made of 3D woven honeycomb composites through structural improvements. To achieve this, an optimization of the honeycomb design was carried out using a statistical tool by varying its geometrical parameters. A Box Behnken design was employed, using three independent factors: cell height, cell size, and cell wall thickness to assess its impact and their interactions on responses. The performance was evaluated using a multiobjective response to maximize impact energy absorption, achieve the target cushion factor, and balance relative density for lightweight design. Since the liner materials were subjected to flatwise compression and dynamic impact tests to assess the performance. Their behavior. The results revealed that the honeycomb core with a cell height of 15 mm, a cell size of 10 mm, and a cell wall thickness of 0.6 mm exhibited good behavior. The response surface analysis and contour plots were used to analyze the interactions and combined effects of variables on each response. It was observed that lesser cell size shows significant improvement in impact energy with higher wall thickness. However, the cushion factor implies inadequate energy mitigation. The analysis comparing desirability and confirmatory experiments highlighted the potential for the aircrew helmet liner to achieve its maximum performance. This study provides valuable insights into the structural design of 3D woven honeycomb composite liners for aircrew helmets and its findings signify the potential for applications in the aerospace and defense industries.

中文翻译：

---

3D 编织蜂窝复合材料内衬的结构改进，增强机组头盔的能量吸收和冲击性能

本研究旨在通过结构改进来提高由 3D 编织蜂窝复合材料制成的机组头盔内衬的性能。为了实现这一目标，使用统计工具通过改变其几何参数来优化蜂窝设计。采用 Box Behnken 设计，使用三个独立因素：细胞高度、细胞大小和细胞壁厚度来评估其影响及其对反应的相互作用。使用多目标响应评估性能，以最大限度地提高冲击能量吸收、实现目标缓冲系数并平衡轻量化设计的相对密度。由于衬里材料经过了平面压缩和动态冲击测试来评估性能。他们的行为。结果表明，孔高度为 15 mm、孔尺寸为 10 mm、孔壁厚度为 0.6 mm 的蜂窝芯表现出良好的性能。响应面分析和等高线图用于分析变量对每个响应的相互作用和综合影响。据观察，较小的泡孔尺寸表明壁厚较大时冲击能显着提高。然而，缓冲因子意味着能量缓解不足。比较合意性和验证性实验的分析强调了机组头盔衬垫实现其最大性能的潜力。这项研究为机组头盔的 3D 编织蜂窝复合材料内衬的结构设计提供了宝贵的见解，其研究结果表明了其在航空航天和国防工业中的应用潜力。