Fatigue analysis is a branch of structural engineering that focuses on predicting the lifespan and durability of materials and structures under repeated loading and cyclic stress. It involves studying the progression of cracks and damage that occur over time due to cyclic loading, such as in machinery, bridges, aircraft, and other infrastructure. Fatigue analysis uses mathematical models, simulation techniques, and testing methods to assess the fatigue resistance of materials and components, and to design structures that can withstand repeated loading without failure. Its goal is to ensure the safety and reliability of structures by accurately predicting their fatigue life and identifying potential failure points.