Acoustic emission in carbon fibre-reinforced plastic materials

2000 ◽  
Vol 25 (7) ◽  
pp. 533-537 ◽  
Author(s):  
O SIRON ◽  
H TSUDA
Keyword(s):  
Acoustic Emission ◽  
Carbon Fibre ◽  
Plastic Materials ◽  
Reinforced Plastic ◽  
Carbon Fibre Reinforced Plastic

Damage assessment of carbon fibre reinforced plastic using acoustic emission technique: experimental and numerical approach

2020 ◽  
pp. 147592172094643
Author(s):  
Claudia Barile ◽  
Caterina Casavola ◽  
Giovanni Pappalettera ◽  
Vimalathithan Paramsamy Kannan
Keyword(s):  
Finite Element ◽  
Acoustic Emission ◽  
Carbon Fibre ◽  
Crack Length ◽  
Research Work ◽  
Numerical Approach ◽  
Acoustic Energy ◽  
Reinforced Plastics ◽  
Reinforced Plastic ◽  
Carbon Fibre Reinforced Plastic

In this research work, the acoustic emission results obtained from testing double cantilever beam specimens with carbon fibre reinforced plastic laminates are analysed. The acoustic emission descriptors such as amplitude, frequency centroid, counts, duration and risetime are clustered using k-means++ algorithm. An unconventional and innovative way of using the acoustic emission descriptors, after the clustering, is introduced. This method can favourably be used for relating the different damage progression modes in fibre reinforced plastics. Apart from this, the cumulative acoustic energy is used for predicting the crack length of the specimens. The predicted crack length is almost identical to the actual crack length opening recorded in each specimen. Finally, analytical and finite element models are used for validating the experimental results under the mode I delamination. The finite element studies are carried out using cohesive zone modelling in Comsol Multiphysics® platform.

Acoustic emission studies of filament-wound carbon fibre reinforced rings and pressure vessels

1976 ◽  
Vol 11 (2) ◽  
pp. 97-101 ◽  
Author(s):  
M Fuwa ◽  
A R Bunsell ◽  
B Harris
Keyword(s):  
Acoustic Emission ◽  
Carbon Fibre ◽  
Pressure Vessels ◽  
Model Systems ◽  
Screw Thread ◽  
Working Pressure ◽  
Filament Wound ◽  
Oblate Spheroids ◽  
Reinforced Plastic ◽  
Carbon Fibre Reinforced Plastic

Following earlier work on the use of acoustic emission techniques for studying fatigue and fracture in unidirectional plane samples of carbon fibre reinforced plastic, experiments have been carried out on filament-wound rings and pressure vessels. The hydraulic expansion to failure of rings of carbon/epoxy composites represents the first step away from the earlier studies of model systems to more realistic structures, and it appears that the rings behave in exactly the same way as tensile samples. Of greater significance, however, is the fact that polar-wound pressure vessels in the form of oblate spheroids with aluminium screw-thread end connexions also show the same kind of acoustic emission patterns. If a vessel is pressurized and held at constant pressure the acoustic output is gradually reduced until it ceases. If the vessel is unloaded and reloaded, the pressure at which emission recommences (about 93 per cent of the previous maximum) can then be considered to be a safe working pressure. The response of these vessels to monotonic loading, cyclic loading and stress relaxation is very similar to that of unidirectional tensile samples.

Impact and Damage Localisation of Carbon-Fibre-Reinforced Plastic Plates

PAMM ◽  
2011 ◽  
Vol 11 (1) ◽  
pp. 639-640 ◽  
Author(s):  
Andy Ungethuem ◽  
Rolf Lammering
Keyword(s):  
Carbon Fibre ◽  
Reinforced Plastic ◽  
Carbon Fibre Reinforced Plastic
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