Strain field analysis with the X‐ray integration method

The so-called X-ray sin2 method for measuring internal stresses is not always acceptable, because it postulates a constant orthogonal stress distribution in the layer passed by the beam. It is demonstrated that the often measured non-linear distribution of deformations is numerically connected with stress distributions, which are variable and inclined against the surface. The calculation of the internal stresses and their parameters is based on the solution of trigonometric polynoms of the variable with integrals. The penetration depth of the X-ray beam must be known. For general numeric solutions a computer program can be given. Solutions step by step can be carried out with a programmable pocket calculator. The ‘sin2 method’ is a special case of the integration method, which is still developing.