A study of the influence of the reinforced fiber orientation and the propellant aluminum content on the ablation and erosion performance of Ethylene Propylene Diene Monomer type insulation is presented. A subscale solid rocket motor has been used, with ammonium perchlorate and hydroxyl-terminated polybutadiene propellant composition. Seven static firing tests were conducted: six with low Al and one with high Al content. The EPDM articles had four different Kevlar fiber orientations: circumferential, longitudinal, diagonal (45°), and random. Numerical simulations were supplemented to decipher the experimental outcome. The numerical results exhibit an over-prediction tendency, yet they show that the examination of post-fire charring of the insulation is insignificant. The test results indicate that the longitudinal fiber orientation has the least ablative resistance.

中文翻译：

---

固体火箭发动机中 EPDM\Kevlar 绝缘子的烧蚀性能研究

研究了增强纤维取向和推进剂铝含量对乙烯丙烯二烯单体型绝缘材料的烧蚀和侵蚀性能的影响。使用了亚尺度固体火箭发动机，具有高氯酸铵和羟基封端的聚丁二烯推进剂组合物。进行了七项静态燃烧试验：六项含铝量低，一项含铝量高。EPDM 制品有四种不同的 Kevlar 纤维取向：圆周、纵向、对角线（45 °) 和随机。补充了数值模拟以破译实验结果。数值结果显示出过度预测的趋势，但它们表明绝缘材料的火灾后炭化检查是微不足道的。测试结果表明纵向纤维取向具有最小的烧蚀阻力。