CHARACTERIZATION OF FATIGUE-DRIVEN DELAMINATION IN MODE II
Topic(s) : Material and Structural Behavior - Simulation & Testing
Co-authors :
Ainhoa ARRESE (SPAIN), Faustino MUJIKA (SPAIN), Jordi RENART (SPAIN), Laura CARRERAS (SPAIN)Abstract :
Insight into the behavior of composite laminates against fatigue crack initiation and growth is essential to accurately predict component service life and to establish safe maintenance periods.
In this work, an extrapolation procedure to characterize the mode II fatigue behavior is presented and validated.
The extrapolation procedure, based on the compliance variation, assumes that all effects associated with damage are included in the equivalent crack length. In this method, new factored expressions of flexibility (C0i), Integral-J (J0i) and crack tip displacement (Δ0i) are defined and according to their polynomial expressions concerning the equivalent crack length, invariant relationships between J0i-C0i and Δ0i-C0i are obtained for a given material system and test configuration.
Once the master curves have been calibrated, the extrapolation procedure enables the determination of both the Paris law and the degradation of the cohesive zone during the fatigue test.
In this work, an extrapolation procedure to characterize the mode II fatigue behavior is presented and validated.
The extrapolation procedure, based on the compliance variation, assumes that all effects associated with damage are included in the equivalent crack length. In this method, new factored expressions of flexibility (C0i), Integral-J (J0i) and crack tip displacement (Δ0i) are defined and according to their polynomial expressions concerning the equivalent crack length, invariant relationships between J0i-C0i and Δ0i-C0i are obtained for a given material system and test configuration.
Once the master curves have been calibrated, the extrapolation procedure enables the determination of both the Paris law and the degradation of the cohesive zone during the fatigue test.