Reducing drilling-induced delamination in composite tube by magnetic colloid back-up

H. Hocheng, C. C. Tsao, C. S. Liu, H. A. Chen

Research output: Contribution to journalArticle

18 Citations (Scopus)


Drilling is an indispensible machining process for building a load-carrying structure of composite materials. Delamination defect is often produced at the exit of drilling, which threatens the service safety of the structure. There are back-up methods to reduce delamination when drilling the open flat-plate composite structure, but none for drilling into the curved-surface or hollow-shape structures. This study describes an innovative method using electromagnet and the deformable inexpensive colloid mixed with iron powder to produce magnetic back-up force at drilling exit to suppress delamination in industrial tube parts. The delamination extent can be reduced by 60-80%. The optimal volume ratio of powder-to-colloid is found 1:3.

Original languageEnglish
Pages (from-to)85-88
Number of pages4
JournalCIRP Annals - Manufacturing Technology
Issue number1
Publication statusPublished - 2014

All Science Journal Classification (ASJC) codes

  • Mechanical Engineering
  • Industrial and Manufacturing Engineering

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