Limiting gauge volume for an area detector type neutron stress measurement was studied in order to apply to measure residual stresses in rails. A conical slit (a slit with circular groove of 1 mm width) was manufactured and used for the experiment. A simulation study was also conducted on this situation and considered on neutron diffraction profiles and stresses to be evaluated. It was found from the experiment that effective neutron diffracted beams were able to be obtained when the conical slit was used, and their behavior was almost agreed with the simulation study. It was also found from the simulation study that the stress obtained with the X-ray cosα method was attenuated if it was applied to neutron diffraction data as well as if the conical slit was used. The correction method was developed and applied to measure shearing stresses in rails.

View full abstract

[in Japanese]

View full abstract