风力发电机主轴表面裂纹应力强度因子计算  

Calculation of Stress Intensity Factors for Surface Cracks of Wind Turbine Spindle

作　　者：郭勇 杨明川 秦瑞冰 杨红 李乾坤 GUO Yong;YANG Mingchuan;QIN Ruibing;YANG Hong;LI Qiankun(Mingyang Smart Energy Group Limited,Zhongshan 528437,China)

机构地区：[1]明阳智慧能源集团股份有限公司,广东中山528437

出　　处：《机械工程师》2025年第2期104-107,112,共5页Mechanical Engineer

摘　　要：针对表面裂纹对风力发电机组主轴强度影响的问题,以含半椭圆初始裂纹的主轴为分析对象,运用有限元软件求解在极限转矩工况下主轴上不同位置的裂纹、不同长度的裂纹和不同方向的裂纹应力强度因子,对比分析不同裂纹的最大等效应力和发生位置。结果表明:裂纹在主轴的位置越靠后应力强度因子越大,等效应力越大;在主轴同一位置处,裂纹深度不变的情况下长度越长则应力强度因子越大,等效应力越大;在主轴同一位置处,0°和90°方向的裂纹等效应力最大,属于滑开型和撕开型的复合型裂纹。所得结论为风力发电机主轴断裂分析提供理论依据。Aiming at the impact of surface cracks on the strength of wind turbine main shafts,the main shaft containing a semi elliptical initial crack is taken as the analysis object,a finite element software is used to solve the stress intensity factors of cracks at different locations,lengths,and directions on the main shaft under limiting torque conditions,and to compare and analyze the maximum equivalent stress and occurrence location of different cracks.The results show that the greater the stress intensity factor(SIF),the greater the equivalent stress,the closer the crack is to the principal axis;At the same position of the principal axis,the longer the crack depth and length are constant,the greater the stress intensity factor is,and the greater the equivalent stress is;At the same position of the main axis,the equivalent stress of cracks in the 0°and 90°directions is the highest,belonging to the composite mode of sliding and tearing crack.The obtained conclusions provide a theoretical basis for the fracture analysis of the main shaft of a wind turbine.

关 键 词：主轴强度 半椭圆裂纹 应力强度因子 等效应力 

分 类 号：TK83[动力工程及工程热物理—流体机械及工程]