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Authors
Advisor(s)
Abstract(s)
Structural componentsmay have cracks, and in these components, a crack
tip represents an extremely concentrated stress. Obtaining an accurate assessment of
the related strain gradient is challenging when using discrete experimental methods.
An efficient alternative is the use of optical techniques, which do not require physical
contact. These techniques provide continuous information about displacement
fields and their derivatives, allowing for strain evaluation. This paper presents the
application of the Moiré interferometry method for comprehensive characterization
of the displacement field in the vicinity of a crack tip in a flat plate. The plate crack
resulted from a fatigue test, and it was subjected to a three-point bending test. In
the crack region, a diffraction grating with 1200 l/mm was previously applied in two
orthogonal directions.After assembling the experimental setup, measurements of the
displacement field were carried out for different load values. Algorithms for deriving
and filtering the displacement field have been developed to calculate the strain field.
Description
Keywords
Fracture mechanics Interferometry Moiré Optical methods Numerical simulation
Pedagogical Context
Citation
Ribeiro, J. E.; Rocha, J. (2024). Analysis of the Displacement Field Along a Surface Crack with Moiré Interferometry. In: Silva, L.F. da (Ed.) Materials Design and Applications V. Cham: Springer Nature. p. 163-173. ISBN 978-3-031-73905-7.
Publisher
Springer Nature