Engineering components may contain small crack-like defects that experience combinations of primary and secondary stresses during service. A new formalism of the R6 V factor, V_g, has been introduced over previous years to quantify the influence of plasticity interaction under combined primary and secondary loading based upon such defects within a large range of finite element analyses.The aim of this paper is provide experimental validation to the V_g approach such that it satisfies validation requirements for potential inclusion to R6. Estimates of failure from implementing V_g, as well as the R6 V approach, to experiments available from literature are presented. These experiments include plate tests subjected to weld residual stresses, cylinders subjected to thermal shock conditions and pre-compressed laboratory specimens. This range of specimens covers those considered in validation of the existing approaches in R6 and some more recent experiments.When applying the existing R6 V and the V_g plasticity interaction parameters the accuracy of the methods diverges with increasing plasticity; with the V_g approach providing the more accurate result at intermediate and high levels of L_r (i.e. beyond L_r = 0.7). However, since both the existing R6 and the V_g plasticity interaction parameters are conservative the experiments provide useful validation to both methods.
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