High-precision neutron-diffraction measurements for the determination of low-level residual stresses in a sandstone
2000
Abstract Strain analysis by means of neutron diffraction usually has an accuracy of about 10 −4 , which is far too inaccurate in view of the very low level of residual strains to be expected in most geological samples. We report a method for an improvement of the accuracy by more than an order of magnitude. Using this technique, we were able to determine quantitatively a load stress as low as 1 MPa applied to a sandstone sample. The same technique allowed us to show that there are residual stresses in the order of 1 MPa in a Cretaceous sandstone from the Elbezone.
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