Open AccessStudy on Crack Propagation Characteristics of Pitch Bearing Based on Sub-model
Author(s) -
Qiang Zhang,
Jiawei Du,
Zong Ping Huang
Publication year - 2020
Publication title -
journal of physics. conference series
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.21
H-Index - 85
eISSN - 1742-6596
pISSN - 1742-6588
DOI - 10.1088/1742-6596/1678/1/012086
Subject(s) - stress intensity factor , bearing (navigation) , fracture mechanics , crack closure , structural engineering , materials science , crack growth resistance curve , intensity (physics) , stress concentration , crack tip opening displacement , mechanics , engineering , computer science , optics , physics , artificial intelligence
The pitch bearing is one of the key components of the wind turbine. The complex stress state, manufacturing process and harsh environment can all produce cracks that will lead to the final failure of the pitch bearing. Since there are few papers on cracked pitch bearings, the paper uses ANSYS and Franc3D co-simulation, and innovatively proposes a sub-model method to study the stress intensity factor and crack growth characteristics of the bolt hole defects of pitch bearings. From two aspects of crack length-depth ratio c/a and its propagation, the distribution of the stress intensity factor at the crack tip is explored. It is found that as the length-to-depth ratio c/a increases, the crack propagation trend gradually changes from extending along the crack length to the crack depth direction; as the crack propagation length increases, the intensity factor at the end of the crack surface is greater than that at the tip of the crack depth. The intensity factor indicates that when the crack expands to a certain size, the trend of crack growth along the surface is greater than the trend along the depth direction, and the propagation path is similar to the actual crack propagation path, which verifies the accuracy of the numerical simulation.