Slope Modeling of the Local Fatigue Curve

From an idea of [27], modified in [43], a model has been proposed for simulating the S/N local curve. The local k value is inferred by elementary values of Push/Pull and Bending tests slopes, with an analogy to Eq.7.30. If kzdW is the slope of the fatigue curve obtained by a Push/Pull test, and kb W is the slope of the fatigue curve obtained by a rotating bending test, the local value of k can be derived as, Fig. 7.21:

klocale = 1 / kbW _ Л /X_m

kzdW kzdW 2/d

The value of m, for Low Alloy Steels is equal to 0.05.

Slope Modeling of the Local Fatigue Curve

Fig. 7.21 Local fatigue curves at different x’ values, modified by [43] from [27]

Slope Modeling of the Local Fatigue Curve

Fig. 7.22 Specimens geometry: smooth (a), shallow notched (b) and sharply notched (c)

Updated: 4 сентября, 2015 — 7:57 дп