Comparison of Different Cure Monitoring Techniques.
Alexander Kyriazis1, Christian Pommer1, David Lohuis1
1Institut für Mechanik und Adaptronik, Technische Universität Braunschweig, 38106 Braunschweig, Germany.
Sensors (Basel, Switzerland)
|October 14, 2022
Summary
Monitoring epoxy resin cure is key for controlling composite manufacturing. Simultaneous measurement of acoustic, dielectric, optical, and strain methods reveals distinct sensitivities, highlighting the need for multi-sensor systems.
Area of Science:
- Materials Science
- Polymer Chemistry
Background:
- Accurate monitoring of epoxy resin cure is crucial for controlling manufacturing processes, particularly in fibre-reinforced plastics.
- Various physical properties change during epoxy resin curing, leading to diverse measurement techniques.
Purpose of the Study:
- To directly compare different cure monitoring methods for a room-temperature curing epoxy resin.
- To evaluate the sensitivity, interference immunity, and repeatability of simultaneous measurements using multiple techniques.
Main Methods:
- Simultaneous application of structure-borne sound acoustic, dielectric, optical, and strain-based methods to a single epoxy resin sample.
- Determination of the degree of cure using a kinetic resin model based on temperature data.
Main Results:
- Significant, yet explainable, differences were observed in the performance of the various measurement methods.
- Some methods are sensitive to early-stage curing (pre- and around gel point), while strain-based methods are sensitive post-gel point.
- Kinetic modeling provided an additional degree of cure determination.
Conclusions:
- The choice of cure monitoring method depends on the specific stage of the curing process and desired sensitivity.
- A multi-sensor node approach, measuring several physical properties concurrently, is recommended for component-integrated curing monitoring.
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