An energy based criterion for high cycle multiaxial fatigue

Abstract

is an open access repository that collects the work of Arts et Métiers ParisTech researchers and makes it freely available over the web where possible. Kqwnrds.-High cycle multiaxial fatigue, criterion, energy.

The effect of quenching and defects size on the HCF behaviour of Boron steel

“…Concerning the shear/tension fatigue strength ratio for the untreated material without artificial defects or defects smaller than 100µm this ratio is equal to τ a /σ a = 0.69 and is a typical value for ductile steels [23]. For the quenched material this ratio is much higher τ a /σ a = 0.82.…”

Fatigue Life of a SG Cast Iron under Real Loading Spectra: Effect of the Correlation Factor Between Bending and Torsion

“…This observation also has been done on cast iron by Grubrisic [14] and Palin-Luc [10] under sinusoidal loading conditions. For the studied material, under constant amplitude multiaxial fatigue tests (bending and torsion), the phase shift effect on the fatigue limit improves the fatigue strength, but only 7 % at 10 6 cycles [17]. Shift of phase influence is often discussed in literature.…”

How to reduce the duration of multiaxial fatigue tests under proportional service loadings

“…To take the effect of the stress triaxiality into account and to consider its influence on this threshold, Palin-Luc et al [7] and Banvillet et al [5,6] introduced an empirical function F, Eq. (3), depending on both, the triaxiality degree of stresses dTðMÞZ Wg sph ðMÞ=WgðMÞ and a material parameter b (see [5,6] for details).…”

“…This paper presents a technique to transform a real proportional multiaxial stress strain time sequence (recorded in-service from strain gauges stuck on a component) in a simplified one which is shorter in time than the original one and equivalent in term of fatigue life: the number of simplified sequences to fatigue crack initiation is the same as the number of original sequences. The proposal is based on the non-damaging threshold stress proposed by Palin-Luc et al [4][5][6][7] and its equivalent strain work density given to an elementary volume of material between a peak and a valley of the stress history. These concepts are summarized first hereafter; secondly, the technique to simplify an original sequence is presented.…”