Two axles were mounted to both ends of the rotating spindle and bending forces were applied to the axles thru a spring mechanism located at both ends of the machine. Fatigue testing is a specialised form of mechanical testing that is performed by applying cyclic loading to a coupon or structure. 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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