Fatigue Analysis: Where Do We Even Start? | Engineering Deep Dive

Fatigue analysis is often taught as a step-by-step process, but the real challenge lies in knowing where to begin. In this session, we shift the focus away from just running calculations and dive into what truly influences fatigue—starting with the basics of how and when cracks form in structures under repeated loads. Using visual explanations and real-life examples like train wheel failures, we unpack the core factors that affect fatigue life, such as load history, stress ranges, mean stress effects, and mission profiles. We’ll explore how to define these inputs accurately, discuss common complications, and highlight the role of measurements in making reliable predictions. Ultimately, this session aims to answer the often-overlooked but critical question: Where do we actually start when doing fatigue calculations? In this session, we're not just talking about how to do fatigue calculations—we’re uncovering where to start and what really matters. Through real-world examples (like train wheel failures) and clear visual explanations (not just equations!), we explore: 0:00 Introduction 1:00 The basics of fatigue and crack initiation & why we focus on crack start, not full failure 5:09 Real-life complications in fatigue analysis 8:42 Defining events and mission profiles 12:10 What we need for fatigue calculations 17:50 Factors impacting fatigue life 20:00 Measurements and fatigue calculations 22:18 FEA and fatigue calculations 27:17 Where DO we start? For more information, visit our website: https://simteq.co.za/blog/understanding-fatigue-analysis-where-to-start/