Quantitative Measurement of the Tack for Carbon Fiber Reinforced Epoxy Prepreg by Using a Compression-to-Tension...

Area of Science:

• Materials Science
• Composite Manufacturing

Background:

• Prepreg tack is a critical process quality parameter in composite material laying.
• Current methods for testing prepreg tack lack standardization.

Purpose of the Study:

• To establish a standardized, quantitative testing method for prepreg tack.
• To introduce the Compression Tack Index (CTI) as a quantitative evaluation metric for prepreg tack.

Main Methods:

• Development of a novel compression-to-tension testing method.
• Evaluation of prepreg/prepreg tack and prepreg/metal tack for carbon fiber reinforced epoxy prepregs.
• Comparison with the qualitative vertical metal plate method.

Main Results:

• The compression-to-tension method demonstrates suitability for both unidirectional and fabric prepregs.
• Test results exhibit good repeatability, stability, and are independent of operator variability.
• The Compression Tack Index accurately reflects tack formation and separation, offering superior discrimination compared to the vertical metal plate method.
• Slitting prepregs without polyethylene film exhibit lower tack than mother prepregs with film.

Conclusions:

• The compression-to-tension method provides a reliable and quantitative approach to assessing prepreg tack.
• The Compression Tack Index is a robust parameter for characterizing prepreg tack, accounting for both formation and separation dynamics.
• This standardized method enhances process quality control in composite manufacturing.