Ultrasonic reconsolidation of separated CF-PEEK composite layers at 20 kHz — An experimental study on parameter optimization and Ex-situ characterization

IF 6.3 2区材料科学 Q1 MATERIALS SCIENCE, COMPOSITES

Composite Structures Pub Date : 2024-11-22 DOI:10.1016/j.compstruct.2024.118722

Balaji Ragupathi , Lennard Rotzinger , Mario Prescher , Michael Rienks , Lutz Kirste , Frank Balle

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引用次数: 0

Abstract

Ultrasonic-assisted joining can replace the current repair strategies, such as adhesive bonding, to join the repair patches onto the damaged aerospace composite structures due to their energy and time efficiency. This work reports on the process optimization of repairing separated carbon fiber reinforced (CF)/ poly-ether-ether-ketone (PEEK) layers through ultrasonic reconsolidation at 20 kHz and its influence on the mechanical performance. The results showed that weld force and weld time dominate the temperature evolution, which was used to set the ultrasonic process window. Repairing CF-PEEK layers to different laminate architecture exhibited a 15% deviation from the reference repair. Compared with quantitative results, the ex-situ investigation showed that excessive holding force caused fiber–matrix debonding, leading to a cohesive failure inside the composite laminate. An optimal holding force, approximately 25% of the used weld force, is recommended to alleviate these damages.

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20 kHz 下分离 CF-PEEK 复合材料层的超声波再固结--关于参数优化和原位表征的实验研究

超声波辅助接合因其节能、省时的特点，可取代粘合剂粘接等现有修复策略，将修复补片接合到受损的航空航天复合材料结构上。这项研究报告了通过 20 kHz 超声波再固结技术修复分离的碳纤维增强 (CF) / 聚醚醚酮 (PEEK) 层的工艺优化及其对机械性能的影响。结果表明，焊接力和焊接时间对温度的变化起着主导作用，可用于设置超声波工艺窗口。对不同层压结构的 CF-PEEK 层进行的修复与参考修复的偏差为 15%。与定量结果相比，原位调查表明，过大的夹持力会导致纤维基质脱粘，从而导致复合材料层压板内部的内聚失效。建议采用最佳夹持力（约为所用焊接力的 25%）来减轻这些损坏。

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来源期刊

Composite Structures 工程技术-材料科学：复合

CiteScore

12.00

自引率

12.70%

发文量

1246

审稿时长

78 days

期刊介绍： The past few decades have seen outstanding advances in the use of composite materials in structural applications. There can be little doubt that, within engineering circles, composites have revolutionised traditional design concepts and made possible an unparalleled range of new and exciting possibilities as viable materials for construction. Composite Structures, an International Journal, disseminates knowledge between users, manufacturers, designers and researchers involved in structures or structural components manufactured using composite materials. The journal publishes papers which contribute to knowledge in the use of composite materials in engineering structures. Papers deal with design, research and development studies, experimental investigations, theoretical analysis and fabrication techniques relevant to the application of composites in load-bearing components for assemblies, ranging from individual components such as plates and shells to complete composite structures.