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Open AccessArticle

Deformation Wave Theory and Application to Optical Interferometry

1
Department of Chemistry and Physics, Southeastern Louisiana University, Hammond, LA 70402, USA
2
Department of Mechanical Engineering, Niigata University, Niigata 9502181, Japan
*
Author to whom correspondence should be addressed.
Materials 2020, 13(6), 1363; https://doi.org/10.3390/ma13061363
Received: 21 January 2020 / Revised: 23 February 2020 / Accepted: 25 February 2020 / Published: 17 March 2020
A method to diagnose the deformation status of solid objects under loading is discussed. The present method is based on a recent field theory of deformation and fracture and optical interferometry known as the Electronic Speckle-Pattern Interferometry (ESPI). Using one of the most fundamental principles of physics referred to as symmetry in physics, this field theory formulates all stages of deformation and fracture on the same theoretical basis. In accordance with the formalism, the theory has defined the criteria for different stages of deformation (linear elastic, plastic and fracturing stages) expressed by certain spatiotemporal features of the differential displacement (the displacement occurring during a small time interval). The ESPI is used to visualize the differential displacement field of a specimen as two-dimensional, full-field interferometric fringe patterns. This paper reports experimental evidence that demonstrates the usefulness of the present method. A tensile load is applied to an aluminum-alloy plate specimen at a constant pulling rate and the resultant in-plane displacement field is visualized with a two-dimensional ESPI setup. The differential displacement field is obtained at each time step and the interferometric fringe patterns are interpreted based on the criterion for each stage of deformation. It has been found that the criteria of linear elastic deformation, plastic deformation and fracturing stage are clearly observed in the corresponding fringe patterns and that the observations are consistent with the loading characteristics. View Full-Text
Keywords: deformation and fracture of solids; Electronic Speckle-Pattern Interferometry; nondestructive testing; field theory; comprehensive theory of deformation and fracture deformation and fracture of solids; Electronic Speckle-Pattern Interferometry; nondestructive testing; field theory; comprehensive theory of deformation and fracture
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MDPI and ACS Style

Yoshida, S.; Sasaki, T. Deformation Wave Theory and Application to Optical Interferometry. Materials 2020, 13, 1363. https://doi.org/10.3390/ma13061363

AMA Style

Yoshida S, Sasaki T. Deformation Wave Theory and Application to Optical Interferometry. Materials. 2020; 13(6):1363. https://doi.org/10.3390/ma13061363

Chicago/Turabian Style

Yoshida, Sanichiro; Sasaki, Tomohiro. 2020. "Deformation Wave Theory and Application to Optical Interferometry" Materials 13, no. 6: 1363. https://doi.org/10.3390/ma13061363

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