Nonlinear local wave-direction estimation for in-sight and out-of-sight damage localization in composite plates

Self-reference broadband local wavenumber estimation (SRB-LWE) for defect assessment in composites

“…Current research of the authors (and of multiple other research groups) focusses on methods for reducing the inspection time considerably. As an example, current authors introduced out-of-sight nonlinear local wave-direction estimation as a fast initial inspection tool [33]. In addition, different research groups showed that the compressive sensing algorithm can be used to reconstruct the full wavefield response out of a limited amount of distributed measurement points [15,[34][35][36].…”

A global-local damage localization and quantification approach in composite structures using ultrasonic guided waves and active infrared thermography

“…It was observed that most of the GW-based research works focus mainly on damage identification or localization [9,10,[14][15][16][17][18][22][23][24] and very few works deal with damage dimension estimation/quantification. The damage size measurements are key to industrial engineering as small surface impacts create HLC quickly in composite structures.…”

“…BVID and HLCs are considered for the SHM-NDT study, as they are the initial causes of the strength reduction in the composite structures. Many researchers analyzed the SHM GW-based amplitude values drop changes at the impact regions in carbon fiber-reinforced polymer (CFRP) structures for damage identification [10][11][12][13][14][15][16][17][18][19][20][21][22][23][24][25]. Boettcher et al used GW to evaluate the impact of energy dissipation in structures [11].…”

Probabilistic ultrasound C-scan imaging of barely visible impact damage in CFRP laminates

“…Toassure the structural integrity of a composite part, it is crucial to apply appropriate non-destructive testing (NDT) techniques. Several NDT techniques have been developed over the years, making use of various physical principles: vibrational testing [1,2], (vibro-)thermography [3,4], shearography [5,6], guided elastic waves [7][8][9] and ultrasonics [10][11][12], amongst others. The ultrasonic pulse-echo technique is perhaps the most widespread NDT technique for the inspection of composites, and has been successfully applied for the estimation of local fiber orientation and content [13], and for the localization of porosities [14], inserts [15] and delamination damage [10].…”