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Interface Characterization of Consolidated PPGF Tapes on PPGF Mat Material
Andreas Kapshammer1, Matei Constantin Miron2, Lukas Dangl3
1Institute of Polymer Product Engineering, Altenberger Straße 69, 4040 Linz, Austria.
Polymers
|February 28, 2023
Summary
Thermoplastic composites offer advantages over thermosets. Optimizing consolidation time significantly enhances interface strength, increasing strain energy release rate by 400% in PPGF UD tapes on PPGF mat substrates.
Area of Science:
- Materials Science
- Composite Materials Engineering
Background:
- Thermoset composites dominate automotive and aviation but suffer from long cycle times and poor recyclability.
- Thermoplastic composites are emerging as a sustainable alternative, utilizing fiber-reinforced tapes consolidated with a substrate.
- Effective stress transfer at the tape-substrate interface is crucial for composite performance, as interface failure leads to significant mechanical property loss.
Purpose of the Study:
- To investigate the impact of manufacturing parameter variations on the interface strength of thermoplastic composites.
- To determine the influence of consolidation pressure, temperature, and time on the interface properties of polypropylene-glass fiber (PPGF) UD tapes on a PPGF mat substrate.
Main Methods:
- Utilized a mandrel peel testing setup to characterize interface properties.
- Varied consolidation parameters including pressure, temperature, and time within an industrially relevant process window.
- Focused on polypropylene-glass fiber (PPGF) unidirectional (UD) tapes consolidated onto a PPGF mat substrate.
Main Results:
- Increasing consolidation time from 60s to 120s at 230°C and 1 bar resulted in a 400% increase in the mean strain energy release rate (G).
- Elevating consolidation pressure at constant temperature and time yielded a modest 20% improvement in the G value.
- Consolidation time demonstrated a significantly greater influence on interface strength compared to consolidation pressure.
Conclusions:
- Consolidation time is a critical parameter for optimizing the interface strength in PPGF UD tape/PPGF mat thermoplastic composites.
- Properly controlled manufacturing parameters, particularly time, can substantially enhance load transfer and mechanical performance.
- The findings provide valuable insights for improving the manufacturing processes and performance of thermoplastic composites.
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