METHOD FOR ESTIMATING STRESS INTENSITY FACTORS AND METHOD FOR CALCULATING ASSOCIATED SERVICE LIFE

摘要

The invention relates to a method for estimating (100) stress intensity factors (FIC) in a numerically modelled part, in the context of a fatigue crack propagation model, comprising the following steps: - (E2): obtaining, from a numerical model of the part to be analysed (20), a plurality of values simulated at various points of the part to be analysed (20), - (E3): determining a converted value (ΔK ) of the effective stress intensity amplitude corresponding to a straight front of a planar crack, as well as a converted length (a) of the crack corresponding to a planar crack with a straight front, said converted values being determined by equalisation of the energy dissipated in the three-dimensional crack of the numerical model and the energy dissipated in the crack of a standard model of a planar crack with a straight front, - (E4): interpolating converted values of effective stress intensity factor amplitude between two successive converted lengths (a), - (E5): storing the converted values of effective stress intensity factor amplitude interpolated in this way.