Community Research and Development Information Service - CORDIS


Reliable estimates of residual stresses by nondestructive testing techniques have recently become an essential requirement for the efficient design of composite materials and structures. The neutron scattering technique has been recognized as a powerful tool in the characterization of advanced materials due to its potential to reveal stress distributions deep within the material specimen, which is not very feasible by X-ray measurements, and more importantly at material interfaces, where the latter technique is simply not applicable. Two operating facilities are available for the purpose of residual stress measurements by neutron diffraction at the high flux reactor (HFR) in Petten. One (HB4) is equipped with a pyrolytic graphite (PG) double monochromator. The extent of the improved capabilities of the new setup of the HB4 instrument is shown by a series of strain measurements performed throughout a thick nuclear piping austenitic steel weld. These advances now make it possible to map the tensorial stress state within the interior of this weld and the piping heat affected zone despite the problems of microstructural inhomogeneity and anistropy due to large size and texture exhibited in and around the weld.

Additional information

Authors: YOUTSOS A G, JRC Petten (NL);OHMS C, JRC Petten (NL)
Bibliographic Reference: Paper presented: First Hellenic Conference on Composite Materials and Structures, Xanthi (GR), 2-5 July, 1997
Availability: Available from (1) as paper EN 40967 ORA
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