Library filed under Structural Failure

Blade breaks off wind turbine east of Enid

The broken blade sits about 100 yards behind the wind turbine, crushing all of the corn that surrounds it. The cornfield belongs to Ken Carpenter, who declined to comment. Cleaning up the blade and wind turbine could take anywhere from a couple of weeks to two months, and will involve bringing a large crane near the field to take the blade off, McIntyre said. 
1 Jun 2017

'Forgotten washer' heard in hub before wind turbine collapsed in Cape Breton

Enercon's email did not elaborate on the hub's damage. However, documents from the Labour Department regarding a subsequent stop-work order said a hub assembly was damaged in a "bearing failure" in March 2016. On Aug. 17, workers tested the turbine's lightning-protection system, which required positioning the blades so they pitched into the wind.
15 May 2017

Vestas wind turbine collapse in Lemnhult, Sweden

Ro2017_01-slutrapport-lemnhult_thumb On December 24, 2015, a Vestas wind turbine collapsed in Lemnhult, Sweden. More than a year later, the Swedish Accident Investigation Authority has launched its report. The full report, in Swedish, can be accessed by clicking the links on this page. An English summary which is also provded in the report is posted below. Images of the collapsed Vestas V112 turbine can be found here.
22 Feb 2017

Hundreds of Tuscola County wind turbine motors being replaced, design flaw blamed

Gauger said it’s been determined that the “old style” keyway pitch motor is “defective” and not able to handle the load that is being placed on them by longer blades. He said the motor is essentially trying to adjust itself so that there is less drag. “What happens is on the upswing or the downswing, it’s actually got some slack in there and that’s that clunking noise that people are hearing,” Gauger said.
14 Jan 2017

http://www.windaction.org/posts?p=5&topic=Structural+Failure
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