Abstract
A corn silo made from corrugated sheet was the subject of a complete structural failure during standard operation. The main goals of the investigations performed were to identify possible causes for the accident (i.e., list of hypotheses), to choose the most probable one and to provide evidence by experimental and theoretical analysis. Metallographic analysis of the cracked sheet showed significant thickness reduction due to corrosion. The standard strength analysis resulted in a generally high stress level and a high likelihood of cracking in the corroded area. However, the bursting of the silo could not be explained alone based on this calculation. Therefore, with help of fracture mechanics it was assessed whether an unstable propagation of the initial crack was realistic. The general results of this study led to the conclusion that the bursting of the silo was most probably due to unstable propagation of a crack originated in the corroded area of the sheet metal near the inspection window.
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