1. A method for analysis of 3D features of a curved component, subject to cyclical stresses, in a gas or combustion turbine, using a 2D probabilistic analysis, the method comprising: operating a system for evaluating the curved component subjected to a stress field, the system comprising a processor and an output device, the system being operated for: modeling the curved component comprising a stress concentrating feature; determining a circumferentially-dependent stress concentration profile around the stress concentrating feature; calculating a probability of failure of the curved component using a 2D probabilistic failure analysis of the stress concentration profile; performing a 2D probabilistic failure analysis for each of multiple angles around a circumference of the stress concentration profile; averaging results of the analyses to obtain a single probability of failure value of the curved component; outputting the probability of failure; controlling a downtime of the curved component based on an output generated by the system; and extending the service interval of the curved component, wherein a 3D stress field distribution of a 3d feature of the curved component or the curved component is mapped onto a 2D stress field.