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Mean Stress Diagrams

Mean Stress Diagrams & Fatigue Life: The Complete Haigh Diagram Explained Are you ready to master one of the most crucial concepts in fatigue analysis? In this video, we dive deep into mean stress diagrams, the essential tool for predicting the lifespan of components subjected to fluctuating loads. What You’ll Learn: • The Effect of Mean Stress: See how introducing a mean stress (σm) dramatically alters the traditional stress-life (S-N) curve and influences the material’s fatigue endurance. • Plotting Constant-Life Curves: Learn how to plot stress amplitude (σa) versus mean stress (σm) to generate constant-life curves, allowing you to predict material life under various combined stresses. • The Goodman Line: Understand the widely used Goodman relationship, which provides a linear criterion for estimating fatigue life based on the material's endurance limit (Se) and ultimate tensile strength (Sut). We'll cover the necessary modifications for negative mean stresses (compressive loads). • First-Cycle Yielding: Discover the importance of the Langer yield line to ensure your design avoids failure due to plastic deformation on the very first load cycle. • The Complete Picture: The Haigh Diagram: We bring all these concepts—the Goodman line, constant-life contours, and the Langer yield line—together to construct the full Haigh Diagram, providing a comprehensive map for safe and reliable component design under combined loading. Whether you're tackling your first fatigue problem, designing high-performance aerospace parts, or studying the mechanics of materials at extreme conditions, this video is your definitive guide to the Haigh Diagram!