Simultaneous X‐ray measurements in‐situ of tri‐axial stresses, Poisson's ratio and the stress free lattice spacing

Abstract

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).

Characterization and modelling of the residual stresses induced by belt finishing on a AISI52100 hardened steel

“…The measurements were carried out in the (2 1 1) martensite peak (majority phase), localized at 2 = 1560, at 39 different orientations (Cullity, 1978). Residual stresses were measured at the surface and at different depths by successive etching ultra-thin stressed layers up to 200 m. The RIM method (Röntgen integral method = X-ray integral method) (Wern, 1991;Peiter and Wern, 1987;Ordas, 2003;García-Navas et al, 2005) was used to calculate the residual stress depth profiles with an accuracy of ±60 MPa (García-Navas et al, 2005, 2006García Navas, 2006).…”

Electro-discharge machining (EDM) versus hard turning and grinding—Comparison of residual stresses and surface integrity generated in AISI O1 tool steel

“…Peak positions are calculated using the conventional Gaussian curve fitting. Residual stress depth profiles are conventionally analyzed using sin 2 method (Noyan and Cohen, 1987) but in the present work the presence of strong stress gradients made the use of this method impossible so an integral method known as RIM method (Wern, 1991;Peiter and Wern, 1987) was used. In this method the strain normal to the surface is expressed by a Taylor series (introducing transversal, longitudinal and in depth strain gradients) and integrated through a weighed integration.…”

Hard Turning Plus Grinding–a Combination to Obtain Good Surface Integrity in Aisi O1 Tool Steel Machined Parts

“…Peak positions are calculated using the conventional Gaussian curve fitting. Residual stress depth profiles are conventionally analyzed using sin 2 w method (Noyan and Cohen, 1987) but in the present work the presence of strong stress gradients made the use of this method impossible so the integral RIM method (Wern, 1991;Peiter et al, 1987;Christenson et al, 1960;Wern and Peiter, 1989;Wern and Peiter, 1986) was used.…”