Transcription of Fatigue Analysis, Damage calculation, Rainflow counting
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Fatigue Analysis, Damage calculation, Rainflow counting
- Copyright 2000 - 2022 Dewesoft , all rights reserved. Fatigue Analysis, Damage calculation , Rainflow counting What is Fatigue Analysis and Why We Need It Before going into the Fatigue analysis details, let us consider the following example. Say we wanted to break a metal rod that is not too thick. How would we tackle the task? In a brute-force way like the guy in the picture below or some other way? Well, if we asked a Fatigue analysis expert he would probably suggest us to repeatedly bend both ends of the rod slightly upwards and downwards. And he would be right.
In this case, the Palmgren-Miner damage accumulation hypothesis states that each cycle with amplitude Si uses a fraction 1 / Ni of the total life. Thus the total fatigue damage D is given by equation: where ni is the number of cycles with amplitude Si. Fatigue failure occurs when the damage D exceeds one.
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