Numerical Simulation Of Influence Of Cutting Surface Integrity On Fatigue Properties

304stainless steel has good mechanical properties, heat resistance and corrosionresistance; it is widely applied to the equipment and parts with requirements of goodcomprehensive performance (corrosion resistance and moldability). But stainless steel isplastic material, sensitive to the stress and strain, with serious processing hardening, lowthermal conductivity, which determines it to be a kind of material that is difficult to bemachined, whose cutting process is very easy to cause complex surface integrity. Theexploration of surface profile of cutting machining, residual stress, and surface hardness hassignificant effect on304stainless steel fatigue performance.Firstly this article considered the effect of the wave bottom radius of surface profile withthe same roughness on the stress concentration, and confirmed the streamlined shape surfaceprofile modeling. Because multiple adjacent gap would significantly reduce the stressconcentration effect of all notches, choose the number of the simplified gap in the finiteelement analysis. Based on the data of cutting experiment, different simplified surface modelswere designed and static stress calculation was carried out. By comparing stress concentrationfactor with the theoretical stress concentration factor of the roughness, the effectiveness ofthe model was discussed.Then the effect of the residual stress and work hardening on fatigue was discussed.Residual stress and work hardening were equivalent treated, in the finite element model.Based on the theory of fatigue damage, designlife was used to calculate the fatigue life.Meanwhile, the influence of the residual stress was considered, Goodman was used for themean stress correction. The surface hardness is equivalent to the tensile strength, then thecalculation results were analyzed. The influence of different parameters of roughness,residual stress, work hardening and three factors of cutting machining on the initial fatiguecrack was discussed. The study revealed that fatigue life would decrease with the increasingroughness values and residual tensile stress, increase with the increasing surface hardness value, among the cutting parameter, feed was the most significant factor to fatigueperformance, cutting speed was the second.