Experimental Study On Fatigue Life And Residual Strength For CFRP Laminates

The load circumstance of the"Chamber of the Outer-Culvert"on the aircraft engine is so complicated, that the integrality design and evaluation of the component become a really tough problem. Whilst the anti-fatigue design of the Chamber is one of the critical technologies whose basis is the research on the fatigue properties of the laminates.Based on the"ninth-fifth"project, this article was carried out the experimental research on the fatigue performance for the T300/BMP316 laminates with the stacking sequence of [45/-45/0/0/-45/90/0/90/45/0]s.Tension-tension fatigue experiment was carried out at three different stress-level, the fatigue life and the S-N curve of the unnotched laminates were acquired. A certain fatigue residual damage model based on the analysis on residual stiffness is established. And through the double-loaded fatigue experiments, the results fit well with the model.Furthermore, experimental study on the centrally notched laminates was carried out, in order to get a deeper knowledge of their fatigue properties. Results showed that the centrally notched laminates have an extraordinarily good fatigue performance, that they could survive more than 106 cycles under tension-tension load with high stress level without obvious damage. Also, an experimental study on the residual strength after fatigue load was carried out. It was clearly showed that the post-fatigue residual strength was larger than the tensile strength. The result also showed that the more cycles the laminates experienced, the larger their residual strength would be.