Drill-exit temperature characteristics in drilling of UD and MD CFRP composites based on infrared thermography

Rao Fu, Zhenyuan Jia*, Fuji Wang, Yan Jin, Dan Sun, Lujia Yang, De Cheng

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

57 Citations (Scopus)
428 Downloads (Pure)


This paper presents a comprehensive study on the complex drill-exit temperature characteristics in the drilling of unidirectional (UD) and multidirectional (MD) CFRPs using a state-of-art microscopy infrared imaging system. For the first time, temperature variation and distribution at drill exit have been revealed in full detail, associated with the CFRP material properties and drilling conditions. Results suggest that the actual drill/CFRP interactions have critical but similar effects on the drill-exit temperatures for both types of CFRPs. Specifically, three distinct cutting regions with varying temperature characteristics are evident when the main cutting edge is acting on the drill exit material. In all cases, the temperature distribution features elliptical shape, of which the eccentricity depends on the lay-up sequence and the drilling depth. In addition, the real time temperature profiles and 2D/3D maximum temperature distribution maps are created with high visualization. With the aid of those findings, the relationships between drilling temperature maxima, their locations and drilling depths have been discovered and temperature effects on drill-exit damages are revealed for the first time. MD CFRP is proven more difficult than UD CFRP to achieve high drilling qualities at certain fiber cutting angles due to the associated temperature effects. Such important knowledge enables the identification of the heat affected zones and subsequently informs strategies for reducing the negative temperature effects.
Original languageEnglish
Pages (from-to)24-37
Number of pages14
JournalInternational Journal of Machine Tools and Manufacture
Early online date09 Aug 2018
Publication statusPublished - Dec 2018


  • Drilling of CFRP
  • Drilling qualities
  • Temperature characteristics
  • Temperature effects
  • Thermal image

ASJC Scopus subject areas

  • Mechanical Engineering
  • Industrial and Manufacturing Engineering


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