6.4.4 Main Takeaways on Fatigue in aircraft Structures
Characterizing Fatigue Life
Fatigue is a damage phenomenon whereby a material/structure deteriorates under repeated loading below its ultimate strength, deteriorating its load carrying capability. One common way of characterizing the fatigue performance of materials is to subject them to constant amplitude cyclic loading and plot the number of cycles to failure,
𝑁, vs. the applied stress amplitude, 𝑆 or 𝜎𝑎.
This diagram (illustrated below) is known as a Wohler Curve, Fatigue Life Diagram, or sometimes the 𝑆 – 𝑁 curve.
Introduction to Aerospace Structures and Materials by TU Delft OpenCourseWare is licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International License.
Based on a work at https://online-learning.tudelft.nl/courses/introduction-to-aerospace-structures-and-materials/.