摘要
以某实际工程刀盘为例,利用ANSYS Workbench对TBM刀盘结构在典型工况下进行静力学分析,得到3处薄弱位置,在刀盘薄弱位置引入预制裂纹,后改变裂纹形状比,得到不同位置裂纹随形状比改变时应力强度因子的分布变化。结果表明,正滚刀刀座处主要裂纹是开裂式且主要往深度方向扩展,边滚刀刀座处第一种裂纹类型应力强度因子呈现负值,而后两种裂纹数值都在6 MPa·mm 1/2以下,说明裂纹扩展不是该处的主要失效形式。该研究可为刀盘设计过程中裂纹扩展和寿命预测领域提供参考,对延长刀盘寿命,减少工程中的经济损失有重要意义。
Taking a practical engineering cutterhead as an example,the static analysis of TBM cutterhead structure under typical working conditions was carried out by ANSYS Workbench,and three weak positions were obtained.Prefabricated cracks were introduced at the weak positions of the cutter,and the crack shape ratio was changed afterward,so as to get the distribution change of stress intensity factor at different positions of cracks with the change of the shape ratio.Results show that the main cracks at the positive hobbing cutter seat are open cracks and mainly expand in the depth direction,the first crack type at the side hobbing cutter seat shows negative stress intensity factor,and the last two cracks are below 6 MPa·mm 1/2,indicating that crack propagation is not the main failure form at this location.This study can provide reference for the field of crack propagation and life prediction in the design process of cutterhead,which is of great significance to extend the life of cutterhead and reduce the economic loss in engineering.
作者
赵健
凌静秀
柳世鸣
吴勉
ZHAO Jian;LING Jingxiu;LIU Shiming;WU Mian(School of Mechanical and Automotive Engineering,Fujian University of Technology,Fuzhou 350118,China)
出处
《福建理工大学学报》
2024年第6期560-566,共7页
JOURNAL OF FUJILAN UNIVERSITY OF TECHNOLOGY
基金
中国博士后科学基金自助项目(2020M671956)。
