If the industrial fan blades are damaged, the entire industrial fan cannot work. Most blades are damaged due to vibration fatigue. Vibration fatigue is mainly divided into: forced vibration fatigue, resonance fatigue and flutter fatigue.
1. Forced vibration fatigue: It means that the blade has been subjected to the force of forced excitation when it is working, but the magnitude and frequency of the excitation force are different, so the damage to the blade is also different for a period of time.
2. Resonance fatigue: Resonance fatigue of blades has always been the focus of blade research, because most blades are damaged and malfunction due to resonance fatigue. The fracture feature caused by resonance fatigue is that there is a fatigue source on the surface of the fatigue crack. After the fatigue source is formed, it develops from the source point to form a shell-shaped fatigue ring.
Two conditions required for resonance fatigue damage: ① reach a certain alternating stress ② vibrate to a certain time
3. Flutter fatigue: Flutter fatigue is caused by blade flutter, and is also called low cycle fatigue. Although there is little flutter fatigue, it is the most harmful. The blade flutters, which is characterized by large amplitude, large vibration stress, and accompanying squeal noise, which can cause serious damage to the blade in a short time.
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