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A main objective of the RESTAND project was to develop industrial confidence in the application of the neutron diffraction technique for residual stress measurement, and its principal deliverable was a relevant code of practice. Measurements were made, on felt and fibre-reinforced composites for heat insulation and thermal shock resistance, on deep-rolled crankshafts to represent complex shapes, a quenched component and through fusion, linear-friction and friction-stir welds for power generation and aerospace applications. From statistical analysis of the data, it has been established that, in most cases, a positional accuracy with a standard deviation of 0.1 mm can be achieved provided proper alignment procedures are adopted. It has also been ascertained that strains can be recorded away from surfaces to a tolerance of ±1E-4 corresponding to a stress of ± 7 to 20 MPa in most materials. Close to surfaces (or interfaces) and regions of variable microstructure, greater errors can be expected.

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Additional information

Authors: YOUTSOS A G, European Commission, Joint Research Centre, Institute for Energy, Petten (NL);OHMS C, European Commission, Joint Research Centre, Institute for Energy, Petten (NL)
Bibliographic Reference: An oral report given at: 3rd Size-Strain conference: Analysis of microstructure and residual stress by diffraction methods (SS-III). Organised by: University of Trento. Held in: Trento (IT), 2-5 December 2001.
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