Fatigue tests are used on a range components from coupons through to full size test. Wohler s fatigue testing machine a spindle in the center of the machine is supported by two bearing blocks and rotated at approximately 15 rpm. Wohler rotating fatigue test there are many mechanisms that can lead to failure but fatigue is perhaps one of the most insidious since it can lead to a catastrophic failure with little or no warning one well known example being the failure of the comet aircraft in the 1950s.
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