SYMPOSIA PAPER Published: 01 January 1992
STP14577S

Influence of the Stacking Sequence on Fatigue Transverse Ply Cracking in Cross-Ply Laminates

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Matrix-cracking mechanisms have been investigated for carbon/epoxy cross-ply laminates. Tension-tension fatigue tests were conducted on two equivalent layups whose only difference consists in the stacking sequence and in the resulting 90° ply thickness. The initiation and development of transverse cracks are characterized. The 90° ply thickness and the loading amplitude appeared to have a strong influence on crack distributions in the specimen and on the propagation rates. A comparison between finite element method (FEM) and analytical results has led us to develop a shear lag analysis in order to estimate the strain energy release rate associated with 90° ply crack formation and growth. Moreover, a fatigue-cracked surface propagation law has been obtained that appears to be independent of the stacking sequence.

Author Information

Henaff-Gardin, C
Laboratoire de Mécanique et Physique des Matériaux, URA 863, Ecole Nationale Supéricure de Mécanique et d'Aérotechnique, Poitiers, France
Lafarie-Frenot, M-C
Laboratoire de Mécanique et Physique des Matériaux, URA 863, Ecole Nationale Supéricure de Mécanique et d'Aérotechnique, Poitiers, France
Brillaud, J
Laboratoire de Mécanique et Physique des Matériaux, URA 863, Ecole Nationale Supéricure de Mécanique et d'Aérotechnique, Poitiers, France
El Mahi, A
Laboratoire de Mécanique et Physique des Matériaux, URA 863, Ecole Nationale Supéricure de Mécanique et d'Aérotechnique, Poitiers, France
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Details
Developed by Committee: D30
Pages: 236–255
DOI: 10.1520/STP14577S
ISBN-EB: 978-0-8031-5190-1
ISBN-13: 978-0-8031-1474-6