Predict and Analysis the Locations of Fatigue Crack in TBM Cutterhead Based on Crack Failure Regions Division

doi:10.3901/JME.2018.01.027

Abstract

Abstract: Cracks are the main cause of TBM cutter failure. As TBM cutter itself bulky, poor working conditions, the complex force function etc., the location of the cracks cannot be predicted accurately, in addition the the fatigue life of TBM cutter also do not be calculated accurately. For dealing with this problem, a method of predicting the crack position of TBM cutterhead based on crack failure regions division is proposed. The dangerous area was divided on the basis of the different stress and structure. Based on the facts, the excavation process is divided into four conditions, analyzed and summarized the stress distribution of TBM cutter in various of working conditions, combined with failure statistics and analysis of the previous crack, the cracks location can be estimated. Statistics the area which crack location belong to area based on the results of crack failure division, as a basis for analysis of crack parameters needed for TBM cutter head fatigue life. Taking the TBM cutterhead of Yin Song Jilin as an example, 10 areas has been divided according to crack-resistance, the forecast results of cracks location including the central block panel, connections between support bars and panel, the center cutter, edge hob knife welding, slag slot. calculated the regional stress amplitude combined with regions division. It's the prerequisite for calculating the fatigue life of TBM cutter.

Key words: crack failure analysis, crack location, driving condition, regions division, stress concentration, TBM cutterhead

CLC Number:

TH113

SUN Wei, ZHU Ye, HUO Junzhou, HUANG Xiaoqi. Predict and Analysis the Locations of Fatigue Crack in TBM Cutterhead Based on Crack Failure Regions Division[J]. Journal of Mechanical Engineering, 2018, 54(1): 27-35.

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