Papers by Author: Rob Delhez

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Authors: Arnold C. Vermeulen, Rob Delhez, T.H. de Keijser, Eric J. Mittemeijer
Authors: T.C. Bor, M.C. Huisman, Rob Delhez, Eric J. Mittemeijer
Authors: J.G.M. Van Berkum, Rob Delhez, T.H. de Keijser, Eric J. Mittemeijer
Authors: L. Velterop, R.D. Xia, Rob Delhez, Eric J. Mittemeijer
Authors: Léon J. Seijbel, Jan-Dirk Kamminga, Rob Delhez
Authors: E.M. van der Aa, M.J.M. Hermans, I.M. Richardson, N.M. van der Pers, Rob Delhez
Abstract: It has been shown that the introduction of a trailing heat sink following a welding heat source at a short distance can reduce or even eliminate the buckling deformation of welded thin plate structures. To increase the insight into the stress development during welding with a trailing heat sink, residual stress measurements were carried out by means of laboratory X-ray and synchrotron X-ray diffraction techniques. Both the laboratory X-ray and the synchrotron X-ray experiments show a difference between the residual stress distributions for the cooled and the uncooled samples. The longitudinal stresses show a reduction in the compressive stress level towards the plate edges, to a level below the critical buckling stress. The transverse stresses are drastically reduced when the active cooling is applied.
Authors: J.G.M. Van Berkum, Arnold C. Vermeulen, Rob Delhez, T.H. de Keijser, Eric J. Mittemeijer
Authors: Arnold C. Vermeulen, Rob Delhez
Abstract: All methods of analyzing the broadening of XRD line profiles have to take into account two basic effects: broadening by the instrument - including the X-ray spectrum - and the characteristics of broadening by size effects and by lattice defects - including their interaction. These effects are handled in practice by a wide range of auxiliary assumptions. In this paper these assumptions and their quality with respect to "appropriateness of purpose" are listed and compared. By systematic ranking of these assumptions in accordance with their quality, a 2-dimensional map can be constructed that visualizes the differences in the quality of the assumptions. This 2-dimensional map brings a new viewpoint to the various methods for line profile analysis, because it enables a qualitative comparison of the assumptions of existing methods and new developments.
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