Download video: Worst Engineering Disasters - Engineering Fails Documentary
Channel: World Documentary Films
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In mechanical design, most failures are due to time-varying, or dynamic, loads that are applied to a system. This phenomena is known as fatigue failure. Fatigue is known as the weakness in a material due to variations of stress that are repeatedly applied to said material. For example, when stretching a rubber band to a certain length without breaking it (i.e. not surpassing the yield stress of the rubber band) the rubber band will return to its original form after release; however, repeatedly stretching the rubber band with the same amount of force thousands of times would create micro-cracks in the band which would lead to the rubber band being snapped. The same principle is applied to mechanical materials such as metals.
Read More: https://en.wikipedia.org/wiki/Engineering_disasters