Fig. 10. High-magnification SEM view of the midchord fracture surface.Figure optionsDownload full-size imageDownload as PowerPoint slide
SEM view of both the trailing-edge fracture surface of blade #1 and failed blade #3 revealed ductile dimples typical of a final tensile overload region. No signs of SB-505124 was found (Fig. 11).
Fig. 11. SEM view of the trailing-edge fracture surface: (a) failed blade #1 and (b) failed blade #3.Figure optionsDownload full-size imageDownload as PowerPoint slide
4.4. Energy Dispersive Spectroscopy (EDS) examination
A comparative EDS examination has been performed at the anomaly area and at a second area away from the anomaly on the fracture surface of the failed blade #1. The carbon content in the anomaly region was found significantly higher (Fig. 12).
Fig. 12. EDS spectrum of the anomaly region (red line) and an area away from the anomaly (Black line)-Blade #1. (For interpretation of the references to colour in out of Africa hypothesis figure legend, the reader is referred to the web version of this article.)Figure optionsDownload full-size imageDownload as PowerPoint slide