Cyclic: bending 358 compression

Fig. 3.50 Schematic of shake-down effect. Test piece subjected to cyclic bending a outermost metal fibers from neutral axis exceed yield strength, b upon unloading fibers that exceeded yield strength remain in either compressive or traction stress state, depending on whether during the loading phase they exceeded yield in traction or compression...

Determine the dynamic loads applied to the part in magnitude and duration. These loads will be compressive, tensile, bearing, bending, and shear loads and, in many cases, combinations of the loads will be present. The time constant of the loadings must be determined. If possible a load time curve should be constructed for the manner of loading and if the load is cyclical (such as it would be in a continuous machine use), the frequency of the loading should be determined. 

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