Comparative analysis of delamination resistance in CFRP laminates interleaved by thermoplastic nanoparticle: Evaluating toughening mechanisms in modes I and II

IF 5.3 Q2 MATERIALS SCIENCE, COMPOSITES Composites Part C Open Access Pub Date : 2024-10-01 DOI:10.1016/j.jcomc.2024.100518

Reza Mohammadi , R Akrami , Maher Assaad , Ahmed Imran , Mohammad Fotouhi

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Abstract

The study considers the delamination resistance of carbon/epoxy laminates modified with Thermoplastic Nanoparticles of Polysulfone (TNPs). A new electrospinning nanofiber technique was utilized to convert polysulfone polymer into nanoparticles and uniformly disperse them within the resin. Fracture toughness was evaluated under loading modes I and II. In mode I, the toughness (G_IC) increased significantly from 170 to 328 J/m² with TNPs incorporation. However, mode II showed minimal change, with G_IIC values of 955 J/m² for virgin and 950 J/m² for TNPs-modified specimens. Scanning Electron Microscopy (SEM) was employed to depict the influence of TNPs on damage characteristics and crack propagation patterns. In mode I, crack deviation enhanced toughness as TNPs bypassed the PSU, while in mode II, cracks propagated through TNPs, resulting in particle smearing on the epoxy surface. This highlights TNPs' potential to modify the fracture toughness in mode I loading, but their effect is constrained in mode II loading scenarios.

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热塑性纳米粒子交错复合材料层压板抗分层能力的比较分析：评估模式 I 和模式 II 的增韧机制

本研究探讨了使用热塑性纳米聚砜粒子（TNPs）改性的碳/环氧层压板的抗分层性能。研究采用了一种新的电纺丝纳米纤维技术，将聚砜聚合物转化为纳米颗粒并均匀地分散在树脂中。在加载模式 I 和 II 下对断裂韧性进行了评估。在模式 I 中，加入 TNPs 后，韧性（GIC）从 170 J/m² 显著增加到 328 J/m²。然而，模式 II 的变化很小，原始试样的 GIIC 值为 955 J/m²，TNPs 改性试样的 GIIC 值为 950 J/m²。扫描电子显微镜（SEM）被用来描述 TNPs 对损伤特征和裂纹扩展模式的影响。在模式 I 中，由于 TNPs 绕过了 PSU，因此裂纹偏离增强了韧性；而在模式 II 中，裂纹通过 TNPs 传播，导致颗粒在环氧树脂表面涂抹。这凸显了 TNPs 在模式 I 加载中改变断裂韧性的潜力，但在模式 II 加载情况下，其作用受到限制。

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