Zhang Zhenzhen, Tie Ying, Fan Congjie, Yin Zhihao, Li Cheng
School of Mechanical and Power Engineering, Zhengzhou University, Science Road 100, Zhengzhou 450001, China.
Polymers (Basel). 2024 Sep 27;16(19):2740. doi: 10.3390/polym16192740.
A study combining multiscale numerical simulation and low-velocity impact (LVI) experiments was performed to explore the comprehensive effects on the impact-resistance of EMAA filaments incorporated as thermoplastic healing agents into a plain woven composite. A multiscale micro-meso-macro modeling framework was established, sequentially propagating mechanical performance parameters among micro-meso-macro models. The equivalent mechanical parameters of the carbon fiber bundles were predicted based on the microscopic model. The mesoscopic representative volume element (RVE) model was crafted by extracting the actual architecture of the monolayer EMAA filaments encompassing the plain woven composite. Subsequently, the fiber and matrix of the mesoscopic model were transformed into a monolayer-equivalent cross-panel model containing monolayers aligned at 0° and 90° by local homogenization, which was extended into a macroscopic equivalent model to study the impact-resistance behavior. The predicted force-time curves, energy-time curves, and damage profile align closely with experimental measurements, confirming the reliability of the proposed multiscale modeling approach. The multiscale analysis reveals that the EMAA stitching network can effectively improve the impact-resistance of plain woven composite laminates. Furthermore, there exist positive correlations between EMAA content and both impact-resistance and self-healing efficiency, achieving a self-healing efficiency of up to 98.28%.
开展了一项结合多尺度数值模拟和低速冲击（LVI）实验的研究，以探究将作为热塑性愈合剂的乙烯-甲基丙烯酸共聚物（EMAA）长丝引入平纹编织复合材料后对其抗冲击性能的综合影响。建立了一个多尺度微观-细观-宏观建模框架，在微观-细观-宏观模型之间依次传递力学性能参数。基于微观模型预测了碳纤维束的等效力学参数。通过提取包含平纹编织复合材料的单层EMAA长丝的实际结构构建了细观代表性体积单元（RVE）模型。随后，通过局部均匀化将细观模型的纤维和基体转化为包含0°和90°排列单层的单层等效交叉面板模型，并将其扩展为宏观等效模型以研究抗冲击行为。预测的力-时间曲线、能量-时间曲线和损伤剖面与实验测量结果密切吻合，证实了所提出的多尺度建模方法的可靠性。多尺度分析表明，EMAA缝合网络可有效提高平纹编织复合材料层压板的抗冲击性能。此外，EMAA含量与抗冲击性能和自愈合效率之间存在正相关关系，自愈合效率高达98.28%。
