Abstract
A new wave energy flow (WEF) map concept was proposed in this work. Based on it, an improved technique incorporating the laser scanning method and Betti's reciprocal theorem was developed to evaluate the shape and size of damage as well as to realize visualization of wave propagation. In this technique, a simple signal processing algorithm was proposed to construct the WEF map when waves propagate through an inspection region, and multiple lead zirconate titanate (PZT) sensors were employed to improve inspection reliability. Various damages in aluminum and carbon fiber reinforced plastic laminated plates were experimentally and numerically evaluated to validate this technique. The results show that it can effectively evaluate the shape and size of damage from wave field variations around the damage in the WEF map.
Highlights
In order to improve the safety, reliability and operation life of various aged structures, development of powerful nondestructive inspection techniques to detect possible defects is critical
We propose a new wave energy flow (WEF) map concept to evaluate the shape and size of damage areas
WEF map represents the distribution of a quantity, which is approximately equivalent to total wave strain energy density during an inspection time period when ultrasonic waves propagate through an inspection region
Summary
In order to improve the safety, reliability and operation life of various aged structures, development of powerful nondestructive inspection techniques to detect possible defects is critical. Based on the laser scanning method (LSM) and Betti’s reciprocal theorem, Takatsubo et al [19,20,21] proposed a simple visualization technique using ultrasonic Lamb wave propagation to perform damage inspections. Defects can be identified by directly observing wave scattering caused by them in the snapshots of the wave propagation at different time points, leading to high inspection reliability Note that this method focuses on the reciprocity of space, i.e., the locations of wave source (actuator) and sensor can be exchanged without any influence on wave propagation in linear and elastic problems.
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