Press Conduction Welding for Secondary Bonding of Aircraft Skin/Stiffener Assemblies Using Carbon Fiber/PEKK Thermoplastic Composites and PEI Adhesive

Hyunseok Choi, Chan Joo Lee, Yong Jun Jeon, Woo Chun Choi, Dongearn Kim

Research output: Contribution to journalArticlepeer-review

Abstract

This study investigates the secondary bonding of aircraft skin/stiffener assemblies using press conduction welding with carbon fiber/polyetherketoneketone thermoplastic composites and polyetherimide adhesive. Recognizing the challenges posed by conventional welding methods in maintaining material integrity and uniformity, this research explores an alternative methodology that mitigates these issues while ensuring high-strength bonds. The press conduction welding parameters were selected based on single-lap shear tests and applied in the bonding of skin and omega stiffener components. The temperature range was determined using differential scanning calorimetry. The pressure was held at 1 MPa for 180 s. The welding temperature that produced a high-bonding strength was identified experimentally; these key variables were then used in the welding process of the skin and omega stiffener. By analyzing how the fibers tear and the effectiveness of interdiffusion between the plies, we were able to gain insights into the bonding strength and fractured surface. The findings suggest that press conduction welding provides a viable route for secondary bonding in thermoplastic composite structures, highlighting its advantages in terms of processing efficiency and integrity. This study contributes to the understanding of the mechanical behaviors of bonded joints and underscores the significance of temperature control in the welding process.

Original languageEnglish
Article number750
JournalPolymers
Volume16
Issue number6
DOIs
Publication statusPublished - 2024 Mar

Bibliographical note

Publisher Copyright:
© 2024 by the authors.

Keywords

  • aerospace materials
  • bonding strength
  • carbon fiber/PEKK
  • composite manufacturing
  • conduction welding
  • PEI adhesive
  • press welding
  • secondary bonding
  • thermoplastic composites

ASJC Scopus subject areas

  • General Chemistry
  • Polymers and Plastics

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