Vibrations and voids in composites Vibrations and voids in composites DERF, ANU, Jun 2007 DERF, ANU, Jun 2007 Jelena Jelena Muric Muric - - Nesic Nesic Supervisors: Supervisors: P. P. Compston Compston , N.Noble, Z. , N.Noble, Z. Stachurski Stachurski
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DERF, ANU, Jun 2007 Jelena Muric-Nesicusers.cecs.anu.edu.au/~u4036671/DERF/June2007/JelenaMuricNesic.pdfPrevious research “Effects of low frequency vibration processing on carbon/epoxy
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Vibrations and voids in compositesVibrations and voids in compositesDERF, ANU, Jun 2007DERF, ANU, Jun 2007
HypothesisHypothesisoo Suitable frequencySuitable frequencyoo Mode of vibrationMode of vibrationoo PositionPositionoo Transmission meansTransmission means
Improving the quality of composite materials Improving the quality of composite materials cured by Quickstep methodcured by Quickstep method
Previous researchPrevious research““Effects of low frequency vibration processing Effects of low frequency vibration processing
on carbon/epoxy laminateson carbon/epoxy laminates””S.R.S.R.GhiorseGhiorse and R.M.and R.M.JurtaJurta Composites, No 1, Jan 1991.Composites, No 1, Jan 1991.
Vibration assisted vacuum composite procVibration assisted vacuum composite procLow freq (40Low freq (40--50Hz)50Hz)2.5 h at 1202.5 h at 120°°--180180°°CC50% decreased void content50% decreased void content10% increased void size10% increased void size0.5% increased density0.5% increased density
Frequency and power of Frequency and power of vibrations (2vibrations (2--40,000Hz)40,000Hz)Time interval of Time interval of vibrations (vibrations (10min)10min)Temperature (Temperature (2020--45C)45C)Amount of Amount of fibresfibres ((44--12 12 layers)layers)
Cut and polishedCut and polished
MicroscopesMicroscopes
Scanning Electron MicroscopyScanning Electron Microscopy
Frequency, power Frequency, power and position of vibrations and position of vibrations How many vibration centers for specific area How many vibration centers for specific area Mode of vibrations (slowMode of vibrations (slow--up/quickup/quick--down)down)TemperatureTemperature
PlansPlans
Currently working with 10Currently working with 10--50Hz50HzHigh frequency (MHz range) for wavelength High frequency (MHz range) for wavelength going through a laminate or to be the size of a going through a laminate or to be the size of a bubble (0.05bubble (0.05--3mm)3mm)QS mould is closed systemQS mould is closed systemNew approachNew approach
Vibrations and voids in compositesVibrations and voids in compositesDERF, ANU, Jun 2007DERF, ANU, Jun 2007