On X-ray measurements of residual stresses in materials with lattice strain gradient

The non-linear distribution of lattice strain³¹⁰vs sin² observed on the surface of a polished steel specimen can be interpreted by tri-axial stress state with surface components of stress tensor₁₁(0)=₂₂(0) and gradientsg₁₁=₁₁/T, g₃₃=₃₃/T. The distribution of experimental values is duscussed from the viewpoint of various ways of calculating₁₁.The authors would like to thank Dr. J. Musil, D. Sc. of the Institute of Physics of Czechoslovak Academy of Sciences for kindly providing the samples which made possible this study.