Prediction of residual stress distribution after turning in turbine disks

Residual Stresses in Orthogonal Cutting of Metals: The Effect of Thermomechanical Coupling Parameters and of Friction

“…Numerical simulations are performed at the cutting speed 2 m/s, firstly without thermal expansion (see Fig. 8(a) showing 11 , the same trend was found for 33 ). In these conditions the increase of friction decreases substantially the maximum stress level of the tensile layer, although it has only a slight influence on the compressive stresses.…”

“…The cutting conditions are those given in the previous paragraph concerning the model validation, except for the cutting speed that is now fixed at 2 m/s in all simulations performed in this work. The distribution of the residual stresses 11 and 33 (the directions x 1 , x 2 , x 3 are shown in Fig. 1), is calculated by taking the thermal expansion into account and is compared to the case where the thermal expansion coefficient is zero ( = 0 , see Figure 4.…”

“…No thermal expansion and no friction are taken into account to isolate the effect of thermal softening on residual stresses. The residual stress distributions for 11 , Figure 9 corresponding to simulations with negative rake angle (−6 ), show that higher Quinney-Taylor coefficients (leading to more heat generation and higher thermal softening) produce a decrease of the level of the tensile stress for 11 . The same trend was observed in the case of 33 .…”

“…Figure 10 shows the difference of temperature fields in each calculation. The effect of a Figure 11 Influence of the tool rake angle on the residual stress 11 . The values of the rake angle are −6 0 and +8 .…”

“…Different Finite Element analyses have been carried out to describe residual stresses due to orthogonal cutting of AISI 316L or AISI 1045 steels, Nasr et al [8], Salio et al [11] Outeiro et al [12,13] and compared to experimental data of M'Saoubi et al [14]. Finally, the influence of tool coating was analysed in [15] and the effect of sequential cuts in [16].…”