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• • • • • Fatigue Fatigue is probably the most common mode of failure. It is generally understood to be the gradual deterioration of a material when subjected to repeated loads. Key factors are the mean stress (average of maximum and minimum), and the variation (difference between the maximum and minimum) components. While most data have been developed for the fully reversing application, there are techniques for applying these data to alternate fatigue situations. Sometimes the stresses vary due to normal operation, and for other cases there is an excitation of a harmonic frequency which acts to amplify the applied load.

SimuTech has extensive experience with analyzing applications with variable loads and defining the associated application criteria. There are several means of evaluating fatigue: • Stress-Life • Strain-Life • Fracture Mechanics SimuTech has had experience applying all three methods. Structural Resonance The dynamics of equipment can be a major factor in design life. Consideration of natural frequencies and modes of excitation can have a major impact on localized stress.

Excitation of a part at or near its natural frequency can produce an amplification of stresses. A complete system will usually have many modes. These must be defined and all of the forcing functions analyzed to avoid interaction.