Fatigue strength and stiffness degradation of the woven roving GFRP under compression-compression cyclic loading

This study revealed compression-compression fatigue behavior of woven roving GFRP laminate used in civil structures. Both static compression test and compression-compression fatigue test were conducted. As a result, fatigue failure was observed even in the compression fatigue test. The S-N curve of compression fatigue was similar to those of tensile fatigue, but the compression fatigue test exhibited smaller fatigue strength than tension when fatigue failure occurred at small loading cycles. Moreover, the stiffness measured through the fatigue test revealed that stiffness decreased as the loading cycle increased. Finally, authors proposed the model which can express the stiffness degradation under compression fatigue.