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Up to 70-80% of all mechanical failures are the result of fatigue in service, due to a cyclic load with a magnitude lower than their design load.
The fatigue capability in Autodesk Nastran lets you test the durability of a part under repeated loading. Fatigue is especially important for rotating machine components and aircraft structures, which repeatedly undergo long periods of vibration.
The random vibration fatigue—or spectral fatigue assessment—feature lets you simulate vibration shake tests. This type of testing is particularly applicable to dynamic analyses with random inputs, such as: