Publications by authors named "Christian Pommer"
The ability to measure the degree of cure of epoxy resins is an important prerequisite for making manufacturing processes for fibre-reinforced plastics controllable. Since a number of physical properties change during the curing reaction of epoxy resins, a wide variety of measurement methods exist. In this article, different methods for cure monitoring of epoxy resins are applied to a room-temperature curing epoxy resin and then directly compared.
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- Resonant ultrasonic cure monitoring is a specialized method for tracking the curing process of composites in enclosed tools, requiring less complex electronic systems than traditional methods.
- Many existing sensors are not suitable for this technique because they're designed for pulse-based testing, contributing to its rare use.
- This paper proposes an optimized sensor design for resonant ultrasound cure monitoring, supported by a multi-parameter finite element (FE) model.
Article Synopsis
- The growing use of composite materials in manufacturing has created a need for quicker and more cost-effective curing processes.
- A new approach is introduced that uses ultrasonic spectroscopy to monitor the curing inside closed tools, allowing for precise tracking of curing times.
- Experimental results show a clear relationship between ultrasonic amplitude and the curing state, with the glass transition point marked by a significant drop in reflected amplitude.