Research on fatigue life of column-plate structures based on micro contact mechanics
In ABAQUS,the fretting contact behavior of the column-plate structure was simulated.The stress distribution law of the fretting contact zone under the condition of different normal contact force P and axial cyclic load σ was analyzed.Based on the idea of critical plane,combined with the Smith-Watson-Topper(SWT)fretting damage parameters,the fretting fatigue life of the model and its influencing factors were further studied.The results showed that the change of P would directly affect the contact pressure P0 and the contact half-width a.σ had a great influence on the axial normal stress and shear stress.The maximum value of the SWT parameter always occurs at the edge of the contact zone,which proved that this was the weak point of the structure;increasing P and σ would reduce fatigue life,but excessive P and σ would slow down this effect.
contact stressfretting fatigueSWT parameterscritical interface methodfretting fatigue life
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