Fatigue & Lifetime

Fatigue failure is one of the most common failure modes in rotating shafts. Even when static stresses are well below yield strength, cyclic loading may eventually lead to crack initiation and fracture. The most traditional approach to fatigue assessment in mechanical design is the Stress–Life Method, also known as the S–N method. This article outlines […]

When designing rotating shafts, fatigue is rarely optional. It is the governing failure mode in most practical applications. One of the most traditional approaches to fatigue analysis is the Stress-Life Method, also known as the S-N method. In this introductory article, we outline the fundamental principles of the method, its core assumptions, and the reasons