Temperature profiles obtained in thermoelastic stress test for different frequencies

• Tipo: Artigo em Revista Científica Internacional
• Data: 2017

Autores

Joaquim Gabriel (Autor) FEUP; Moreira, PMGP (Autor) FEUP; Mário Vaz (Autor) FEUP; António José Ramos Silva (Autor) Outra

Revista

Título: International Journal of Structural Integrity

Vol. 8

Páginas: 51-62

ISSN: 1757-9864

Editora: Emerald

Indexação

ISI Web of Knowledge - 3 Citações

Scopus - 2 Citações

Outras Informações

ID Authenticus: P-00M-E8X

DOI: 10.1108/ijsi-04-2016-0016

Abstract (EN): Purpose - Maintenance is one of the most critical and expensive operations during the life cycle of metallic structures, in particular in the aeronautic industry. However, early detection of fatigue cracks is one of the most demanding operations in global maintenance procedures. In this context, non-destructive testing using image techniques may represent one of the best solutions in such situations, especially thermal stress analyses (TSA) using infrared thermography. The purpose of this paper is to access and characterize the main stress profile calculated through temperature variation, for different load frequencies. Design/methodology/approach - In this paper, a cyclic load is applied to an aluminum sample component while infrared thermal image is being acquired. According to the literature and experiments, a cyclic load applied to a material results in cyclic temperature variation. Findings - Frequency has been shown to be an important parameter in TSA evaluations, increasing the measured stress profile amplitude. The loading stimulation frequency and the maximum stress recorded show a good correlation (R2 higher than 0.995). It was verified that further tests and modeling should be performed to fully comprehend the influence of load frequency and to create a standard to conduct thermal stress tests. Originality/value - This work revealed that the current infrared technology is capable of reaching far more detailed thermal and spatial resolution than the one used in the development of TSA models. Thus, for the first time the influence of mechanical load frequency in the thermal profiles of TSA is visible and consequentially the measured mechanical stress. © 2017 Emerald Publishing Limited.

Idioma: Inglês

Tipo (Avaliação Docente): Científica

Nº de páginas: 12