Fracture analysis of twisted rubber-steel sphere bush with an elliptical surface crack

摘要

In this paper,nonlinear finite element method was used to numerically simulate a rubber-steel sphere bush subjected to torsional load with an elliptical surface crack in the middle rubber layer.The relationships between torsion stiffness and deformation have been gained when large torsion deformations are imposed. The results indicate that torsional stiffness decreases as deformation increases. For a small crack,the influence of crack length on torsional stiffness is very small,and the torsional stiffness is changeless on the whole.The relation curves between tearing energy and crack depth have been given,so have the relation curves among tearing energy,load and thickness of the rubber layer.The results indicate that tearing energy increases as load increases but decreases as thickness of the rubber layer increases. For an elliptical surface crack in the middle rubber layer,tearing energy increases and then decreases as crack depth increases. According to the data,we can get the experimental formula by multiple non-linear data regression.