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Cyclic loading (which is often paired with dynamic loading) is any situation where a load is applied, released then applied again. This is a common occurrence in most real world problems but is especially common in things like cranes where they are moving heavy loads all day.  Certain components on vehicles are also subject to high cyclical loading from bumps or vibrations in the road. CSA W59 describes cyclical loading as anything subjected to more than 30,000 cycles in its lifetime.