Fatigue in materials refers to the phenomenon where a material undergoes progressive and localized structural damage when subjected to cyclic loading, which can eventually lead to failure even at stress levels lower than the material's ultimate tensile strength. This process typically occurs in materials like metals, polymers, and composites, among others. ### Key Points About Material Fatigue: 1. **Cyclic Loading**: Fatigue primarily occurs under repeated or fluctuating loads, rather than a single static load.
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