Composite manufacturing uses pressure and temperature in lay-up to produce parts with high volume fractions, limited features, and low porosity. Modern prepregs are very complex, incorporating significant levels of thermoplastic toughener that makes them behave dually: as unconsolidated thermoplastics at low temperatures, and conventional thermoset prepregs at elevated temperatures. This paper presents an experimental programme to study the compressibility of a modern prepreg at various temperatures and constraint conditions using a Dynamic Mechanical Analyser. Testing revealed a number of physical phenomena, including gradual transition from shear squeezing flow to bleeding percolation flow, strong constraining effects of adjacent non-cured plies, and non-monotonic compressibility over the temperature range of 20-90°C.
|Title of host publication||ECCM 2012 - Composites at Venice, Proceedings of the 15th European Conference on Composite Materials|
|Publisher||European Conference on Composite Materials, ECCM|
|Publication status||Published - 1 Jan 2012|
|Event||15th European Conference on Composite Materials: Composites at Venice, ECCM 2012 - Venice, United Kingdom|
Duration: 24 Jun 2012 → 28 Jun 2012
|Conference||15th European Conference on Composite Materials: Composites at Venice, ECCM 2012|
|Period||24/06/12 → 28/06/12|