The petiole’s fracture of mine-used explosion-proof axial fan has been analyzed by means of finite element analysis (FEA). The reasons of the petiole’s fracture have been found through the structural static and modal simulation calculates for the axial fan’s impeller mechanical system. The structural static analysis results show that the petiole has stress concentration problems, and the modal analysis results demonstrate that the 6th-order natural frequency of the impeller system (which is 83.258 Hz) is close to 5 times of the impeller’s rotation frequency (which is 16.667*5 = 83.335 Hz), therefore it has high risk of resonance for the impeller system. So we conclude that the petiole’s fracture may greatly caused by the stress concentration and the risk of resonance, which may cause the fatigue cracks produced, and the cracks may gradually expanded and eventually caused the petiole fractured. At last, two measures to prevent the fracture of petioles were proposed.
Finite Element Analysis of Axial Fan Blade with Different Chord Lengths
