Machine Tool & Hydraulics
1001-3881
2022
50
12
115
119
10.3969/j.issn.1001-3881.2022.12.022
article
风机齿轮双裂纹扩展特性及寿命分析
Double-Crack Propagation Characteristics and Life Analysis of Wind Turbine Gears
针对某风机增速齿轮疲劳裂纹断裂问题，基于M积分法探究含初始单裂纹及双裂纹增速齿轮裂纹扩展时的变化规律。根据断裂力学原理和有限元原理进行分析计算，得出应力强度因子及疲劳扩展循环次数的变化规律。创建只含1条裂纹的齿轮裂纹模型，计算裂纹扩展时的应力强度因子及疲劳扩展寿命；在初始单裂纹模型上继续创建第2条裂纹，通过改变第2条裂纹的初始位置探究第1条裂纹与单裂纹前缘应力强度因子及疲劳扩展寿命的变化规律。结果表明：整体上看，双裂纹中裂纹1刚开始扩展时比单裂纹的应力强度因子小，扩展到最后会高于单裂纹的应力强度因子，中间有一个交替变换的过程；产生双裂纹时，其中1条裂纹会导致双裂纹中裂纹1的加速扩展，减少寿命周期；双裂纹距离越近，双裂纹中裂纹1加速扩展得越快。
Aiming at the fatigue crack fracture problem of a speed-increasing gear of a wind turbine,based on the M-integral method,the change laws of the initial single-crack and double-crack growth gear crack expansion were explored.According to the analysis and calculation of fracture mechanics principle and finite element principle,the change laws of stress intensity factor and fatigue expansion cycle number were obtained.A gear crack model with only one crack was created,the stress intensity factor and fatigue growth life of the crack propagation were calculated;the second crack was created on the initial single crack model continuely,and the change laws of stress intensity factor and fatigue growth life of the first crack and single crack front edge were explored by changing the 〖JP2〗initial position of the second crack.The results show that as a whole,the stress intensity factor of the 〖JP3〗first crack in the double-〖JP〗crack is smaller than that of the single-crack at the beginning of propagation,and will be higher than that of the single-crack at the end of propagation,and there is an alternating process between them;when a double-crack occurs,one of the cracks will accelerate the propagation of the first crack in the double-crack and reduce the life cycle;the closer the distance between two cracks is,the faster the first crack accelerates.
风机齿轮；M积分法；应力强度因子；双裂纹疲劳扩展
Turbine gear；Mintegral method；Stress intensity factor；Double crack fatigue growth
穆塔里夫·阿赫迈德,白浩宇,孙光耀
MUTELLIP Ahmat, BAI Haoyu, SUN Guangyao
jcyyy/article/abstract/JY20210881