The tri-axial X-ray stress analysis allows, together with boundary conditions and fitting curves, a control of measurements and calculations for the determination in-situ of Poisson's ratio and stress free lattice spacing. A complete internal stress field analysis is discussed in terms of the 'X-ray integral method' on rolled steel discs of 100 0 -6 (ASTM: A29.5, BS: 97012).

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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.

Ermittlung der Zugfestigkeit, Streckgrenze, Bruchdehnung, Brucheinschnürung und Reißfestigkeit an glatten und gekerbten Proben eines Stahles mit rd. 0,4% C, 1,65% Cr und 4,35% Ni bei +20 bis −180°C Prüftemperatur. Einfluß einer versprödenden Anlaßbehandlung. Erörterung der auftretenden Bruchformen im Zusammenhang mit den Festigkeitseigenschaften. Folgerungen, namentlich über die Eignung der ermittelten Kenngrößen als Bewertungsmaßstab für die Sprödbruchernpfindlichkeit.