Open AccessOn the Correlation Between Residual Stresses and Displacements of the Polycrystalline Lattice: an Experimental Strategy
Author(s) -
F. V. Díaz,
F. Rosso,
Alastair Walker,
A. P. M. Guidobono
Publication year - 2020
Publication title -
international journal of mechanics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.16
H-Index - 20
ISSN - 1998-4448
DOI - 10.46300/9104.2020.14.27
Subject(s) - residual stress , materials science , crystallite , aluminium , lattice (music) , residual , composite material , clockwise , mechanics , rotation (mathematics) , condensed matter physics , geometry , metallurgy , mathematics , physics , algorithm , acoustics
This work aims to propose a micro-indent method to evaluate the correlation between the relaxation of residual stresses and the shape changes of the polycrystalline lattice in specimens of a rolled plate of AA 6082-T6 aluminium alloy. Rolling strengthens the surface of the plate by introducing compressive residual stresses. Then, these stresses are relaxed by thermal distension. The method of micro-indents allowed measuring residual displacements with an error below ± 300 nm. The results obtained reveal that the rolling direction plays a vital role in terms of asymmetric expansion of the lattice. Furthermore, the lattice accumulates and restores elastic strain energy in the clockwise and anti-clockwise direction of rotation, alternatively. Finally, when the stress release process is finishing, the lattice adjusts the angle of rotation to approximate to the initial geometric shape.