The article explores the application of multiaxial fatigue criteria in precision mechanical parts machining. It delves into the causes and prediction of fatigue failure, particularly in gear machining, using multiaxial stress analysis and finite element analysis (FEA). Real-world cases from the aerospace, wind power, and rail transportation industries highlight how multiaxial fatigue criteria optimize machining processes and enhance component durability. The article emphasizes the importance of residual stress control, surface treatment, and advanced testing methods to improve fatigue life, providing key insights for both the present and future of mechanical parts manufacturing.

This article explores how finite element analysis (FEA) and process control improve the lifespan of gears in precision machining. FEA is used to assess stress distribution, identify failure points, and optimize processes like carburizing, shot peening, and grinding. By integrating FEA with real-world process adjustments, manufacturers can enhance gear fatigue resistance, reduce crack propagation, and extend gear life. Case studies from companies like BMW, Caterpillar, and Goldwind demonstrate how FEA-guided process optimizations result in more durable, reliable gears, making precision machining more efficient and cost-effective.