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Volume
12, Issue 5, 2003
Acoustic
emission applied to FAILURE analysis of commingled yarn GF/PP composites in
transverse tension and mode I DELAMINATION
D. Lariviere1,
P. Krawczak1*, C. Tiberi2, P. Lucas2
1Ecole
des Mines de Douai, Departement Technologie des Polymeres et Composites, 941 rue
Charles Bourseul, B.P. 838, 59508 Douai Cedex, France
2Saint-Gobain Vetrotex International, 767 Quai des Allobroges, B.P.
929, 73009 Chambery, France
*author to
whom correspondence should be addressed
(Received
5/03; accepted 10/03)
ABSTRACT
This work
aims to analyse the influence of the fibre/matrix interface on the acoustic
response of commingled yarn thermoplastic composites submitted to transverse
tension and mode I fracture mechanics loading. For this purpose, different
interfacial qualities were obtained by modification of the fibre reinforcement
sizing and the matrix coupling. The acoustic emission rate (number of acoustic
events emitted per time unit) has appeared suitable to quantify the damage
involved by the mechanical loading according to the interfacial quality. The
comparison of the acoustic emission obtained for the two loading modes has
shown that, although the amplitude range [59-66dB] is characteristic of
interfacial debondings in transverse tension, it is no more the case for a
mode I delamination test for these commingled GF/PP composites.
Keywords:
Acoustic emission, interface, interphase, unidirectional laminate, glass fibre,
polypropylene matrix, damage mechanisms, transverse tension, mode I
delamination.
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