Impact velocity effect on the delamination of woven carbon–epoxy plates subjected to low-velocity equienergetic impact loads

The low velocity impact behaviour of a woven carbon fibre/epoxy composite has been analysed in this work. The study has been divided in two experimental phases performed in a drop-weight machine. Firstly, an impact has been carried out to determine the main damage mechanisms appearing over the struc...

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Bibliographic Details
Published in:Composites science and technology 2014-04, Vol.94, p.48-53
Main Authors: Zabala, H., Aretxabaleta, L., Castillo, G., Urien, J., Aurrekoetxea, J.
Format: Article
Language:English
Subjects:
Applied sciences
B. Delamination
B. Impact behaviour
C. Damage tolerance
Carbon fiber reinforced plastics
Carbon-epoxy composites
D. Ultrasonics
Damage
Delaminating
Delamination
Exact sciences and technology
Forms of application and semi-finished materials
Impact analysis
Impact loads
Impact velocity
Laminates
Polymer industry, paints, wood
Technology of polymers
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Summary:The low velocity impact behaviour of a woven carbon fibre/epoxy composite has been analysed in this work. The study has been divided in two experimental phases performed in a drop-weight machine. Firstly, an impact has been carried out to determine the main damage mechanisms appearing over the structure for impact energies between 1 and 20J. Force time curve patterns and three different damage inspection techniques have been employed to define an incident impact energy range (between 1.75 and 8.8J) where delamination is the main damage mode over the structure. Secondly, two impact energy levels within this range have been chosen to analyse the impact velocity effect on the generated delamination. Equienergetic impact loads, achieved with different mass and velocity combinations, have been carried out for this analysis. Results show how delaminated area can increase in a 45% while increasing impact velocity, and how this delamination growth, can lead to a 20% reduction of the residual stiffness of the structure within the analysed energy and velocity ranges.
ISSN:0266-3538
1879-1050
DOI:10.1016/j.compscitech.2014.01.016