Mixed mode (I + II, I + III) fatigue crack growth rate description in P355NL1 and 18G2A steel using new energy parameter based on J-integral approach

In this paper, the problem of fatigue crack growth description under mixed mode loading condition is discussed. A new ΔS* crack driving force is proposed for mixed-mode loading conditions. For experimental verification, two types of low-carbon steels were used (P355NL1 and 18G2A /EU S355/). Mixed mode (I + II) fatigue crack growth rate experiment performed for R = 0.05 and R = 0.5 confirmed the usefulness of ΔS* parameter as a crack driving...