FRAGTURE STRESS AS FAILURE CRITERION IN MULTILEVEL FATIGUE STRESSING

The corrosion and eventual collapse of rock bridges is a common problem in hard rock engineering. A critical plane model of the fiber/matrix interaction has been presented. A modified version of the Goodman approach was utilized to take into consideration the influence of mean stress. The effectiveness of the proposed method was experimentally validated by assessing the fatigue life of three different GFRP laminates: UDT [90°], BX [45°]S, and TX [0°2/45°]. The expectations are consistent with our experimental findings. An in-depth example of the application is also offered, this time for the case of composite laminates used in wind turbine rotor blades. To provide a rough estimate of the effect of ignoring shear stresses in fatigue life estimates, predictions are made. Wind turbine blades are made of GFRP laminates, and their fatigue life is considerably shortened by shear forces.