Residual stress effects of a fatigue crack on guided lamb waves. (29th September 2017)

• Record Type: Journal Article
• Authors: Martinez, M; Pant, S; Yanishevsky, M; Backman, D
• Is Part Of: Smart materials and structures. Volume 26:Number 11(2017:Nov.)
• Publication Date: 2017-09-29
• Subjects: guided lamb wave -- fatigue crack growth -- residual stress field -- propagation -- complex structures -- structural health monitoring -- acoustic-ultrasonic; Smart materials -- Periodicals; Strucural design -- Periodicals; 620.11
• DOI: 10.1088/1361-665X/aa8a0c
• Languages: English
• ISSNs: 0964-1726

Abstract

Abstract: Structural health monitoring has focused on the use of computational models to capture the effect of crack-like discontinuities on the behaviour of acoustic-ultrasonic signals. However, few models have taken into account the effect of geometric complexity in combination with residual stresses generated during the fatigue crack growth (FCG) process. In this study, a finite element analysis model of a C-channel type aeronautical structure is evaluated under a pitch-catch scenario. Three different finite element model configurations were considered in order to understand the effects that residual stresses of a fatigue crack emanating from a through-hole have on the guided Lamb wave propagation behaviour. The results demonstrate that numerical modelling is able to capture the change in amplitude and the effect of a phase shift on the guided Lamb wave behaviour due to the presence of the discontinuity and the stress field generated during the FCG process.