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. These tests are used either to generate fatigue life and crack growth data identify critical locations or demonstrate the safety of a structure that may be susceptible to fatigue. Wöhler started his axle investigations by research into the theory of elasticity and was led in 1855 to a method for predicting the deflection of lattice beams that anticipated the work of émile clapeyron.
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