立井钻机中心管的断裂分析

Break analysis of the centre tube of well drill

建立了立井钻机中心管含有表面裂纹的力学模型 ;分析了立井钻机中心管含有表面裂纹的断裂状况 ;探讨了在亚临界扩展阶段疲劳断裂的发展趋势 ;

This paper builds mechanics model of the centre tube containing face crackle of well drill, analyses the break of the centre tube containing face crackle of well drill, inqures into the tendency of fatigue break under subcritical spread stage and obtain the break condition of the centre tube as well as the calculating formulas of entreme size on crackle spread.