Analysis of the residual life of an aluminum 2024 alloy by photometric analysis of structural images

• Published in: Optik (Stuttgart) 2018-07, Vol.165, p.210-217
• Main Authors: Yermishkin, V.A., Tamayo-Meza, P.A., Silva-Rivera, U.S., Sandoval-Pineda, J.M., Rodríguez-Alvarado, L.W., Pérez-Cruz, J.H.
• Format: Article
• Language: English
• Subjects: PHASI program; Reflectivity; Residual material life; Structural damage
• ISSN: 0030-4026; 1618-1336
• DOI: 10.1016/j.ijleo.2018.03.051

•A method to evaluate the stress coefficient according to the photometric analysis of the reflectivity of the zones with and without stress concentrations, was developed.•The experimental results corroborate that the fatigue resistance of the samples increases when a coating is applied to the work surface.•The PHASI method was also used to estimate the residual life of the materials, which is representative in laboratory specimens and in large-scale structural elements.•The obtained results show the high reliability of the method developed for the analysis of structures and the possibilities for solving a wide range of problems. The light reflection by the surface of condensed matter is a problem that has not yet been explained enough in modern physics. Analyzing the spectra of the reflected light is possible to estimate the energy of free electrons evaluating the variation of the reflection spectra under the influence of an external power effect. The physical requirements for photometric analysis of the images were carried out during the development of a multifunctional complex program. This allowed to establish a correlation between the structural damage and photometric parameters in 2024 aluminum alloys, which is presented in this study. Photometric Analysis of Structural Images (PHASI) to obtain the local damage of the material was used. It was performed measuring the amount of visible light reflected by the fragments of the material, before and after fatigue tests. The damage that the material supports under known stress amplitudes was evaluated by fatigue curves, doing a data relation as function of the stress amplitude applied. Results shown a polyharmonic regime between the spectral brightness reflected by the coated aluminum surface and the stress concentration. Thus, the degree of fatigue damage was determined by the material and the actual structural elements.