Beschreibung
In this study, the influence of different measurement parameters of energy dispersive residual stress measurements on the obtained residual stress depth profiles of deep rolled construction steel S355 G10+M was investigated. Especially the diffraction angle θ and afterwards the measuring time t per inclination angle ψ were varied. A diffraction angle of θ = 20° shows an acceptable compromise between achievable information depth and detected total intensity of diffracted X-ray quanta. Furthermore, a measuring time per inclination angle ψ of t = 2,400 s leads to an acceptable standard deviation regarding the determined residual stress states. With these parameters for the energy-dispersive measurement, a comparison between angle-dispersive and energy-dispersive determination of residual stress depth profiles was carried out. Quantitative similarities between these two methods were observed, whereby the energy-dispersive determined residual stress depth profiles are rather discontinuous. A possible explanation could be found in the model used for the calculation of the net-plane-dependent radiographic elastic constants (XEC). In general, the energy-dispersive residual stress measurement was qualified for the determination of residual stress depth profiles of deep rolled construction steel. Based on the findings, a time-efficient non-destructive residual stress measurement can be carried out in the future with the discussed measurement parameters at maximum possible information depth.
