摘要
风力机叶根高强螺栓疲劳断裂失效是影响风力机安全运行的重要因素,而高强螺栓的断裂与螺栓材料和所受载荷关联。以2 MW风力机叶根高强连接螺栓为研究对象,用Abaqus软件有限元仿真,研究42CrMoA螺栓材料的疲劳断裂特征。结果表明:疲劳载荷影响下,叶根螺栓应力沿周向对称分布,600 MPa时螺栓断裂位置位于叶根相接触的螺杆部位。裂纹萌生于光滑试样表面,螺栓疲劳断裂是由于多源裂纹交汇而形成峰线所致。在扭矩作用下,螺栓断裂位置位于轴承相接触的螺杆部位,随平均扭矩从1.2倍增至1.4倍,螺栓损伤寿命由2.49×10^(6)周次降至1 406周次,且断裂特征由NF+LS-LS顺序转变。本研究对揭示风力机叶根高强螺栓疲劳断裂机制和保证风电机组的安全运行有重要意义。
The fatigue fracture failure of high-strength bolts at the blade root of wind turbine is an important factor affecting the safe operation of wind turbine,and the fracture of high-strength bolts is essentially related to bolt material and load. The research object was a 2 MW wind turbine blade root high-strength connecting bolt. The finite element simulation was used by Abaqus software and fatigue tracture characteristics of 42CrMoA bolt material were studied. The results show that under the influence of fatigue load,the stress of blade root bolt is symmetrically distributed along the circumference. At 600 MPa,the bolt fracture location is located at the bolt where the blade root contacts. The crack initiates on the surface of the smooth sample. And the fatigue fracture of the bolt is caused by the peak line formed by the intersection of multiple cracks. Under the action of torque,the bolt fracture position is located at the screw part where the bearings contact. With the torque increasing from 1.2 times to 1.4times the average torque,the bolt fatigue life plummets from 2.49×10^(6) cycles to 1 406 cycles,and the fracture characteristics change along the NF + LS-LS sequence. This study is of great significance to reveal the fatigue fracture mechanism of high-strength bolts at the blade root of wind turbine and ensure the safe operation of wind turbine.
作者
田唤宇
何建军
蒲珉
揭军
曾子竞
王佳炜
刘豪
TIAN Huanyu;HE Jianjun;PU Min;JIE Jun;ZENG Zijing;WANG Jiawei;LIU Hao(School of Energy and Power Engineering,Changsha University of Technology,Changsha 410114,China;National Energy Group Longyuan Jiangyong Wind Power Co.Ltd.,Changsha 410000,China)
出处
《兵器材料科学与工程》
CAS
CSCD
北大核心
2023年第2期117-122,共6页
Ordnance Material Science and Engineering
基金
湖南省研究生科研创新项目(CX20210801)
国家能源集团科技创新项目(HJLFD-QTHT-2020-08)。
关键词
风力机叶根
高强螺栓
42CrMoA
有限元分析
疲劳断裂
wind turbine blade root
high strength bolt
42CrMoA
finite element analysis
fatigue fracture
