Publication detail

Manufacturing and Strength Evaluation of Composite Threads

ZOUHAR, J. KUPČÁK, R. VECERKA, M. VILIS, J.

English title

Manufacturing and Strength Evaluation of Composite Threads

Type

Paper in proceedings (conference paper)

Language

en

Original abstract

This study evaluates the direct machining of internal threads in glass fiber-reinforced (GFRP) and carbon fiber-reinforced (CFRP) composite materials, comparing the performance of cutting taps, conventional thread milling, and orbital thread milling. GFRP and CFRP samples were prepared and drilled under optimized conditions to minimize delamination, followed by thread production using the three different technologies. Visual and microscopic inspections revealed that orbital thread milling consistently produced the highest thread quality with minimal fiber damage, while cutting taps resulted in the most defects. Tensile testing showed that, in GFRP, orbital thread milling achieved the highest maximum load (18.05 kN), only slightly exceeding other methods. In CFRP, thread strength was similar across all technologies for 4 mm thick samples (around 4 kN), but increasing the thickness to 8 mm nearly doubled the strength, regardless of the threading method. The results demonstrate that orbital thread milling is optimal for thread quality, but in CFRP, material thickness is the dominant factor influencing joint strength. Direct threading in composites is feasible when appropriate machining parameters and technologies are applied.

Keywords in English

CFRP | GFRP | orbital thread milling | thread strength | threading

Released

2025-12-01

Publisher

Trans Tech Publications Ltd

Book

Solid State Phenomena

Pages from–to

27–36

Pages count

9

BIBTEX


@inproceedings{BUT200088,
  author="Jan {Zouhar} and Radim {Kupčák} and  {} and  {}",
  title="Manufacturing and Strength Evaluation of Composite Threads",
  booktitle="Solid State Phenomena",
  year="2025",
  journal="Solid State Phenomena",
  pages="27--36",
  publisher="Trans Tech Publications Ltd",
  doi="10.4028/p-kwrD21",
  issn="1012-0394"
}