SYMPOSIA PAPER Published: 01 January 1975

Fatigue Crack Propagation in 0°/90° E-Glass/Epoxy Composites


The mode of fatigue crack growth is described for a 0/90° E-glass/epoxy laminate under cyclic tension-tension loading. Crack growth appears to occur in a stepwise fashion with the crack remaining stationary for many cycles before each step of growth, whereupon a ligament of longitudinal ply at the crack tip is broken. A simple theory is described which assumes that the ligament at the crack tip is fatigued according to the S-N curve of the unnotched material. Using an assumed stress field and cumulative damage law, the number of cycles for initial growth from a notch and the rate of crack growth thereafter are predicted, and good agreement is demonstrated with experimental data.

Author Information

Mandell, JF
Massachusetts Institute of Technology, Cambridge, Mass.
Meier, U
Swiss Federal Laboratories for Testing Materials and Research (EMPA), Dubendorf, Switzerland
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Developed by Committee: E08
Pages: 28–44
DOI: 10.1520/STP33163S
ISBN-EB: 978-0-8031-4652-5
ISBN-13: 978-0-8031-0346-7