Statistical evaluation of damage size based on amplitude mapping of damage-induced ultrasonic wavefield

Gan, Chia Sheng; Chia, Chen Ciang; Tan, Lin Yaw; Mazlan, Norkhairunnisa; Harley, Joel B.

doi:10.1088/1757-899x/405/1/012006

Cited by 6 publications

(3 citation statements)

References 15 publications

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“…The 3D data matrix was processed based on a variant of the statistically thresholded anomaly mapping (STAM) method [27][28][29]. The method has three sequential steps, i.e.…”

Section: Results Processingmentioning

confidence: 99%

Nondestructive detection of incipient thermal damage in glass fiber reinforced epoxy composite using the ultrasonic propagation imaging

Gan

Tan

Chia

et al. 2019

Funct. Compos. Struct.

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Incipient thermal damage (ITD) in polymer-matrix composites could cause substantial loss of material properties and it is notoriously difficult to be detected using nondestructive evaluation (NDE) techniques. The emerging ultrasonic propagation imaging (UPI) could be the solution for the detection problem and its detection probability for ITD was studied in this work. Glass fiber reinforced epoxy plate specimens insulted at temperatures ranging between 1.1 and 1.7 times of the glass transition temperature (Tg) for duration ranging between 5 and 30 min were inspected. The results in the form of statistically thresholded anomaly maps showed clear detection of ITD for specimens insulted at 1.4 and 1.7 times of Tg for 30 and 5 min, respectively, and partial detection for specimens insulted at 1.3 and 1.5 times of Tg for 30 and 10 min, respectively. Finally, an insulting duration-temperature plot with distinguished ITD undetectable, partially detectable, and fully detectable zones was estimated for references of future works.

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“…The 3D data matrix was processed based on a variant of the statistically thresholded anomaly mapping (STAM) method [27][28][29]. The method has three sequential steps, i.e.…”

Section: Results Processingmentioning

confidence: 99%

Nondestructive detection of incipient thermal damage in glass fiber reinforced epoxy composite using the ultrasonic propagation imaging

Gan

Tan

Chia

et al. 2019

Funct. Compos. Struct.

View full text Add to dashboard Cite

show abstract

“…The wavenumber-frequency filtering method can also remove the incident wavefield regardless of the propagation direction, thereby isolating the anomalous waves for improved damage visibility. Signal/data processing can thus be done straightforwardly, as demonstrated in [176,207,275,276]. Other methods are also available for incident removal.…”

Section: Improving the Visibility Of Damagementioning

confidence: 99%

“…A good starting point could be Otsu's method [339,340], k-means clustering [341], or other general-purpose binary classifying algorithms developed for image processing. Some threshold estimation works had been initiated [73,226,227,275,342], and improving these works could be a research direction. Note that if the threshold estimation suffers from the attenuation of signal amplitude due to energy spread, the correction used for calculating the ERMS [106] might be a solution.…”

Section: Challenges and Prospectsmentioning

confidence: 99%

Guided ultrasonic waves propagation imaging: a review

Chia¹,

Lee²,

Harmin³

et al. 2023

Meas. Sci. Technol.

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This article presents a comprehensive review of the laser-based guided ultrasonic waves propagation imaging (G-UPI) system and respective signal/data processing methods related to the nondestructive testing and evaluation of thin-walled structures. The primary goal of this study is to review and recognize various processing methods, explain the working principles of the most influential methods, and highlight outstanding capabilities. In addition, the suitability of the methods for multiple types of damage and defect in various materials and structures are presented. At the same time, success stories of difficult-to-inspect cases are highlighted. Its secondary goal is to compare and discuss the merits and demerits of the laser-scanning part of the system for ultrasound generation and acquisition to provide a guideline for scanning scheme or hardware selection. Finally, the potential challenges and prospects of the G-UPI are discussed. It is expected that this review would serve as an entrance key for newcomers and a reference point for researchers to explore the opportunities for further improvement in the laser ultrasound-based evaluation of critical engineering structures.

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Imaging delamination in composite laminates using perturbation to steady-state wavefields

Xu¹,

Cao²,

Su³

et al. 2021

Smart Mater. Struct.

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Delamination in composite laminates, though barely visible, can jeopardize integrity and safety of the composite structures. Interaction of guided waves with delamination in full wavefields have been widely used to graphically characterize the delamination. Recently, steady-state wavefields (SWs) in place of transient wavefields have been used for imaging delamination. However, interaction with delamination can be largely obscured by steady-state waves and hardly observed. Addressing this problem, this study proposes a novel approach for imaging delamination using perturbation to SWs. In particular, a new concept of delamination-caused perturbation to a SW is proposed. Compared to scattered waves from delamination, it is determined by delamination only and naturally sensitive to delamination. Delamination-caused perturbation to a SW is concentrated within the delamination region and rapidly attenuates at undamaged locations. On the basis of this new concept, a delamination index (DI) is established for imaging delamination, by which the delamination can be graphically characterized. The capability of the approach is experimentally validated on composite laminates with delamination, whose SWs are acquired through laser scanning. The experimental results validate that delamination imaging can be achieved by DIs, by which the occurrence, locations, and sizes of the delamination can be graphically characterized.

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Statistical evaluation of damage size based on amplitude mapping of damage-induced ultrasonic wavefield

Cited by 6 publications

References 15 publications

Nondestructive detection of incipient thermal damage in glass fiber reinforced epoxy composite using the ultrasonic propagation imaging

Nondestructive detection of incipient thermal damage in glass fiber reinforced epoxy composite using the ultrasonic propagation imaging

Guided ultrasonic waves propagation imaging: a review

Imaging delamination in composite laminates using perturbation to steady-state wavefields

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