Multiple fatigue crack growth behavior has been studied in model transparent GFRP laminates. Detailed experimental observations have been made on the growth of individual fatigue cracks and on the evolution of cracks in off-axis layers in and laminates. Three stages of fatigue crack growth in the laminates have been identified: initiation, steady-state crack growth (SSCG), crack interaction and saturation. The results show that SSCG rate is essentially constant under constant load, independent of crack length and crack spacing. Finite element models have been developed and used to calculate the strain energy release rates associated with the off-axis matrix cracking. A correlation has been achieved between fatigue crack growth rates in off-axis layers and the total strain energy release rates.
Three Stages of Fatigue Crack Growth in GFRP Composite Laminates
Contributed by the Materials Division for publication in the JOURNAL OF ENGINEERING MATERIALS AND TECHNOLOGY. Manuscript received by the Materials Division October 11, 1999; revised manuscript received February 13, 2000. Associate Technical Editor: S. Mall.
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Tong, J. (February 13, 2000). "Three Stages of Fatigue Crack Growth in GFRP Composite Laminates ." ASME. J. Eng. Mater. Technol. January 2001; 123(1): 139–143. https://doi.org/10.1115/1.1286234
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