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Article

Influence of a Dynamic Consolidation Force on In Situ Consolidation Quality of Thermoplastic Composite Laminate

1
Institute of Production Engineering and Machine Tools, Leibniz Universität Hannover, An der Universität 2, 30823 Garbsen, Germany
2
Institute of Production Engineering and Machine Tools, Leibniz Universität Hannover, Ottenbecker Damm 12, 21684 Stade, Germany
3
Institute of Polymer Materials and Plastics Engineering, Clausthal University of Technology, Ottenbecker Damm 12, 21684 Stade, Germany
*
Author to whom correspondence should be addressed.
Academic Editor: Francesco Tornabene
J. Compos. Sci. 2021, 5(3), 88; https://doi.org/10.3390/jcs5030088
Received: 8 March 2021 / Revised: 18 March 2021 / Accepted: 18 March 2021 / Published: 22 March 2021
(This article belongs to the Special Issue Thermal Behavior of Thermoset Composites)
For achieving high quality of in situ consolidation in thermoplastic Automated Fiber Placement, an approach is presented in this research work. The approach deals with the combination of material pre-heating and sub-ultrasonic vibration treatment. Therefore, this research work investigates the influence of frequency dependent consolidation pressure on the consolidation quality. A simplified experimental setup was developed that uses resistance electrical heating instead of the laser to establish the thermal consolidation condition in a universal testing machine. Consolidation experiments with frequencies up to 1 kHz were conducted. The manufactured specimens are examined using laser scanning microscopy to evaluate the bonding interface and differential scanning calorimetry to evaluate the degree of crystallinity. Additionally, the vibration-assisted specimens were compared to specimens manufactured with static consolidation pressure only. As a result of the experimental study, the interlaminar pore fraction and degree of compaction show a positive dependency to higher frequencies. The porosity decreases from 0.60% to 0.13% while the degree of compaction increases from 8.64% to 12.49% when increasing the vibration frequency up to 1 kHz. The differential scanning calorimetry experiments show that the crystallinity of the matrix is not affected by vibration-assisted consolidation. View Full-Text
Keywords: CFRP; thermoplastic; in situ consolidation; vibration; AFP CFRP; thermoplastic; in situ consolidation; vibration; AFP
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MDPI and ACS Style

Denkena, B.; Schmidt, C.; Kaczemirzk, M.; Schwinn, M. Influence of a Dynamic Consolidation Force on In Situ Consolidation Quality of Thermoplastic Composite Laminate. J. Compos. Sci. 2021, 5, 88. https://doi.org/10.3390/jcs5030088

AMA Style

Denkena B, Schmidt C, Kaczemirzk M, Schwinn M. Influence of a Dynamic Consolidation Force on In Situ Consolidation Quality of Thermoplastic Composite Laminate. Journal of Composites Science. 2021; 5(3):88. https://doi.org/10.3390/jcs5030088

Chicago/Turabian Style

Denkena, Berend, Carsten Schmidt, Maximilian Kaczemirzk, and Max Schwinn. 2021. "Influence of a Dynamic Consolidation Force on In Situ Consolidation Quality of Thermoplastic Composite Laminate" Journal of Composites Science 5, no. 3: 88. https://doi.org/10.3390/jcs5030088

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