Fatigue Analysis with Linear Elastic Fracture Mechanics | Machine Design - Lecture 9B
Автор: MEchanicsSimplified | By Dr. G, PE
Загружено: 2025-12-02
Просмотров: 39
If you're working through a fatigue analysis and want to understand when cracks will grow and lead to failure, this video will give you a clear, practical introduction to Linear Elastic Fracture Mechanics (LEFM) as a fatigue analysis method. We explore how LEFM works by focusing on crack propagation - an essential perspective for real machine components, particularly in the aerospace industry.
You'll learn how engineers characterize variable loading, how stress intensity drives crack growth, and how to use crack-growth rate models to predict fatigue life. We'll walk through the theory, set up and example problem, and solve it step-by-step so you can see exactly how LEFM is applied in practice.
We’ll cover:
✅ How variable loading is represented in fatigue problems
✅ The meaning of crack growth rate curves and Paris’ Law
✅ A full example calculation from setup to solution
By the end of this video, you’ll understand how LEFM helps engineers quantify crack propagation and make informed design decisions—critical skills in failure mechanics and machine design.
Timestamps:
00:00 - Introduction
00:55 - Characterizing variable loading
06:18 - Introducing LEFM for fatigue analysis
08:11 - Crack growth rates
16:27 - Example set up
19:00 - Example worked
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