摘要
Abstract
The third stage small gear of a 1.5 MW wind turbine gearbox in a specific wind farm is the subject of study.Addressing the problem of gear cracking and fracture during operation,the method of combining linear elastic fracture mechanics theory with finite element method for calculation is utilized,the stress intensity factors at different points along the crack front are accurately computed.From the post-processing results,it is revealed that the mode Ⅰ stress intensity factor predominates.Based on this finite element model,the variation in mode Ⅰ stress intensity factor with load,crack length,and position are analyzed.The results show that with the gradual increase in load,the stress intensity factor curve at the leading edge of the three-dimensional crack at the gear root generally increases;as the initial three-dimensional crack length at the gear root increases,the stress intensity factor curve remains relatively constant at both ends near the tooth surface,while it increases in the middle,i.e.,at the depth of the crack,with the increase of the three-dimensional crack length.When the initial position of the crack is closer to the middle part of the tooth,the overall trend of the stress intensity factor for the gear's three-dimensional crack increases,and the magnitude of increase gradually becomes larger.关键词
风电齿轮箱/齿轮裂纹/有限元分析/应力强度因子Key words
wind power gearbox/gear crack/finite element analysis/stress intensity factor分类
机械制造
