This paper theoretically investigates the effects of stick-slip in rolling contact zone on stress intensity factors(SIFs)for subsurface short cracks.New mathematical models for SIFs including stick-slip ratio are dedu...This paper theoretically investigates the effects of stick-slip in rolling contact zone on stress intensity factors(SIFs)for subsurface short cracks.New mathematical models for SIFs including stick-slip ratio are deduced in two cases.One is a subsurface short crack parallel to surface,and the numerical analysis shows that the value of KⅡincreases with the increase of stick-slip ratio;the other is a subsurface short crack perpendicular to the surface,and the numerical analysis indicates that the positive value of KⅠdecreases with the increase of stick-slip ratio.As △KⅠand △KⅡare necessary to evaluate the fatigue crack propagation rate or fatigue lifetime,the influences of stick-slip ratio on them are then discussed.It is found that the maximum variations of △KⅠand △KⅡare both around 3.0%due to stick-slip ratio variation.展开更多
基金supported by the National Science and Technology Supporting Program(Grant No.2011BAF09B01)
文摘This paper theoretically investigates the effects of stick-slip in rolling contact zone on stress intensity factors(SIFs)for subsurface short cracks.New mathematical models for SIFs including stick-slip ratio are deduced in two cases.One is a subsurface short crack parallel to surface,and the numerical analysis shows that the value of KⅡincreases with the increase of stick-slip ratio;the other is a subsurface short crack perpendicular to the surface,and the numerical analysis indicates that the positive value of KⅠdecreases with the increase of stick-slip ratio.As △KⅠand △KⅡare necessary to evaluate the fatigue crack propagation rate or fatigue lifetime,the influences of stick-slip ratio on them are then discussed.It is found that the maximum variations of △KⅠand △KⅡare both around 3.0%due to stick-slip ratio variation.
