0435710 - ÚJF 2015 RIV CH eng C - Conference Paper (international conference)
Rogante, M. - Mikula, Pavol - Vrána, Miroslav
Assessment of the unstressed lattice parameters for residual stresses determination by neutron diffraction in engineering materials.
Key Engineering Materials. Vol. 592-593. Stafa-Zurich: Transt Tech Publications Ltd, 2014 - (Šandera, P.), s. 465-468. ISSN 1013-9826.
[MSMF 7 - International Conference on Materials Structure and Micromechanics of Fracture /7./. Brno (CZ), 01.07.2013-03.07.2013]
R&D Projects: GA MŠMT LM2011019
EU Projects: European Commission(XE) 283883 - NMI3-II
Institutional support: RVO:61389005
Keywords : residual stresses * interphlanar distance * neutron diffraction * steels * aloys * industrial applications
Subject RIV: BM - Solid Matter Physics ; Magnetism

Thermal neutrons are very useful probe in a nondestructive determination of internal stress, due to their high penetration into most materials. In comparison with conventional Xray techniques, real bulk information on both macro- and micro-strains in materials can be obtained by neutron diffraction techniques. Knowledge of the spatial and directional distribution of internal residual stresses is increasingly considered fundamental to determine their influence on properties of engineering materials and a consequent material behaviour. As the assesment of stresses is always related to the stress free material state, an accurate evaluation of the unstressed lattice parameters, in order to determine RS by ND is one of the key tasks. It helps to avoid inacceptable errors in the course of the real material strain and stress evaluation. The availability of carefully measured zero-strain standards is also essential to confirm the absence of systematic instrumental effects determining the diffraction profile at a chosen scattering angle. In this paper, the state of the art of the main analytical and experimental procedures currently established or adoptable to determine these critical parameters, particularly regarding industrial applications, is presented.
Permanent Link: http://hdl.handle.net/11104/0239533