Abstract Interleaving composite laminates with nanofibrous mat is one of the most reliable methods for increasing interlaminar fracture toughness. The present study seeks to find out how the damage mechanisms of carbon fiber reinforced polymers (CFRPs), subjected to the mode-I and mode-II fracture tests, are affected while those are modified by interleaved Polyamide 66 (PA66) electrospun layers. For this goal, acoustic emission (AE) and scanning electron microscope (SEM) techniques were used for assessing the damage mechanisms. The mode-I test results showed that adding nanofibers could decrease matrix cracking, fiber breakage, and fiber/matrix debonding by 92%, 27%, and 87%, respectively. The AE demonstrated that no fiber breakage occurred during mode-II loading in both non-modified and nanomodified specimens which was validated by SEM images. On the other hand, the two other damage modes, i.e. matrix cracking and fiber/matrix debonding, decreased about 97% in the nanomodified laminates.

中文翻译：

---

使用声发射对由 PA66 电纺纳米纤维交织的 CFRP 层压板的损伤机制进行定量评估

摘要 用纳米纤维垫交错复合层压板是提高层间断裂韧性最可靠的方法之一。本研究旨在找出在经过 I 型和 II 型断裂试验的碳纤维增强聚合物 (CFRP) 的损伤机制如何受到交错聚酰胺 66 (PA66) 电纺层改性的影响。为此，使用声发射 (AE) 和扫描电子显微镜 (SEM) 技术来评估损伤机制。模式 I 测试结果表明，添加纳米纤维可以分别减少 92%、27% 和 87% 的基体开裂、纤维断裂和纤维/基体脱粘。AE 表明，在非改性和纳米改性试样中，在模式 II 加载期间没有发生纤维断裂，这通过 SEM 图像进行了验证。