Exit delamination at the material interface in drilling of CFRP/metal stack

Jae Hoon Ahn, Gyuho Kim, Byung Kwon Min

Research output: Contribution to journalArticlepeer-review

6 Citations (Scopus)


Carbon fiber reinforced polymer (CFRP)/metal stacks have the merit of a high tensile strength-to-weight ratio with the CFRP and high compressive strength with the metal. To use CFRP as a material of structural component in industries, drilling is required to make holes for joining with other parts. In drilling, compared to the component built with CFRP only, the CFRP/metal stacks are less vulnerable to the exit-ply delamination caused by the thrust force because the metal part of the stack plays a role of a back-up plate. However, the delamination frequently occurs at the CFRP-metal interface, even though the thrust force is too small to generate delamination. Existing experimental studies reported that cutting torque as well as thrust force results in exit-ply delamination in CFRP/metal stack drilling, but the mechanism of delamination behavior at the CFRP-metal interface is not established. This study proposes a theoretical model to investigate the exit-ply delamination at the interface between CFRP and metal caused by the cutting torque. Using the model, we calculated the allowable feed limit to prevent cutting torque-induced exit-ply delamination. Through the drilling experiments, the proposed model was validated.

Original languageEnglish
Pages (from-to)227-235
Number of pages9
JournalJournal of Manufacturing Processes
Publication statusPublished - 2023 Jan 6

Bibliographical note

Publisher Copyright:
© 2022

All Science Journal Classification (ASJC) codes

  • Strategy and Management
  • Management Science and Operations Research
  • Industrial and Manufacturing Engineering


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