JOINING STRUCTURAL PARTS OF COMPOSITE MATERIALS FOR LARGE ROTORBLADES

摘要

A fracture mechanics approach is presented for the analysis of structures that develop large-scale damage along adhesively bonded joints. The approach is based on the use of double cantilever beam specimens loaded with uneven bending moments to determine the fracture resistance of the adhesive joints. Next, the measured fracture resistance is used in a model for the prediction of the load-carrying capability of some "medium size" specimens. As an example of use of the approach, some medium size specimens were manufactured and subjected to four point flexure. The measured strength of the medium size specimens were found to agree well with predictions. Finally, we briefly discuss some ideas that may be used in the future combining fracture mechanics and maintenance for wind turbine blade.