The Low Cycle Tensile-torsion Fretting Fatigue Properties of 60Si_2Mn Steel
60Si_2Mn钢的低周拉扭复合微动疲劳特性

The low cycle fretting fatigue properties of 60Si2Mn were investigated in the condition of tensile-torsion multi-axial loading. The results showed that the tensile stress amplitude affect the fretting fatigue performance significantly. With the tensile stress amplitude increasing, the fretting fatigue life reduced nonlinearly, and the cycle softening occurred earlier and completed in less cycles. Oxide wear debris generated on the fretting wear scars have a significant impact on fretting fatigue, which exacerbated fretting wear in the early-stage of fatigue, and eased the wear later. Fretting fatigue crack initialed on the fretting wear scars, propagated along 45o angle to the axial direction at the existence of tangential shear stress, and eventually left tongue shape protrusion significantly at fracture. The greater the tensile stress amplitude, the bigger the tongue protrusion.