2016-Sustainable Industrial Processing Summit
SIPS 2016 Volume 7: Yang Intl. Symp. / Multiscale Material Mechanics
| Editors: | Kongoli F, Aifantis E, Wang H, Zhu T |
| Publisher: | Flogen Star OUTREACH |
| Publication Year: | 2016 |
| Pages: | 190 pages |
| ISBN: | 978-1-987820-48-5 |
| ISSN: | 2291-1227 (Metals and Materials Processing in a Clean Environment Series) |
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Determination of residual stress along depth by in plane 3-directional optical interference moire
Keming Zhang1;1SHANGHAI JIAO TONG UNIVERSITY, Shanghai, China;
Type of Paper: Regular
Id Paper: 314
Topic: 1
Abstract:
A grating rosette moire interferometry and incremental hole drilling combined system is developed to determine the magnitude of the residual stress along depth in an aluminum plate subjected to a uniform uniaxial tensile load. Performing in the plane 3-directional fringe analysis, the optical data contained in the moire interferograms are converted into values of strains in three directions corresponding to the grating rosette. The evaluation is carried out through the measurement of the in-plane displacement field in three directions generated by the introduction of the incremental small hole. The in plane 3-directional displacement fields are determined from the calculation of the optical in plane 3-directional phase distribution by means of a phase shifting method. The magnitude of the principal stresses is finally evaluated through a least-squares calculation and compared with the stress value applied to the specimen measured with strain gages.