Paper Titles
Preface
Development of Infusion Technology for Thermoplastic Composites with PMMA Matrix
p.3
Initial Research on the Machinability of Biocomposite Materials Produced by the SCM Method
p.9
Study of Rake Angle Variation with Focus on Tool Wear, Delamination, and Cutting Forces in Drilling of CFRP Materials
p.19
Manufacturing and Strength Evaluation of Composite Threads
p.27
The Influence of Strain Rate on Tensile Properties of Additive-Manufactured Wood-Based Polylactic Acid (PLA) (CR-Wood): an Experimental Investigation
p.39
Process-Dependent Porosity and Mechanical Properties of Flax and Carbon–Flax Epoxy Laminates
p.47
Influence of Voids on Dimensional Accuracy and Stability in Bonded Metal–Composite Hybrid Joints
p.57
Development of Composite Tank with Bonded Domes for Water Treatment Application
p.71

Manufacturing and Strength Evaluation of Composite Threads

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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.

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Periodical:

Solid State Phenomena (Volume 382)

Pages:

27-36

DOI:

https://doi.org/10.4028/p-kwrD21

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Online since:

December 2025

Authors:

Jan Zouhar, Radim Kupcak*, Martin Vecerka, Jindřich Viliš

Keywords:

CFRP, GFRP, Orbital Thread Milling, Thread Strength, Threading

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© 2025 Trans Tech Publications Ltd. All Rights Reserved

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* - Corresponding Author

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