Les lutins statisticiens de WordPress.com ont préparé le rapport annuel 2013 de ce blog.
En voici un extrait :
Le Concert Hall de l’Opéra de Sydney peut contenir 2.700 personnes. Ce blog a été vu 12 000 fois en 2013. S’il était un concert à l’Opéra de Sydney, il faudrait environ 4 spectacles pour accueillir tout le monde.
In July 1968 the Swedish motor vessel “MV Stureholm” traveled from Sweden across the North Atlantic with destination to the American gulf harbours. About 100 nautical miles north of the peninsula Yucatan the 9,000 HP diesel engine failed as a consequence of fatigue failure of the crankshaft. The ship was disabled and had to be towed to Veracruz, Mexico. The Swedish shipowning company decided to perform a temporary repair in Veracruz by welding the fatigue crack. Back in Sweden the damaged but repaired crankshaft was dismounted from the engine and inspected by surveyors. The result was that a fatigue crack had initiated from a subsurface solidification (hot) crack.
This paper brings out the detail of investigation carried out. Read more at : Failure of a Motor Vessel’s Crankshaft 1968.
An interesting paper of Bogdan Pawlowski, AGH University of Science and Technologie in Krakow, published in « Archives of Metallurgy and Materials » :
Two identical dies for aluminum alloy die-casting failed prematurely because of a number of parallel cracks on the working surface. These cracks were of a mechanical nature related to incorrect microstructural banding orientation of the die core and related to improper heat treatment. The root cause of premature cracking of dies was improper heat treatment (temper embrittlement).
