Delamination detection with fibre Bragg gratings based on dynamic behaviour

Grouve, Wouter Johannes Bernardus; Warnet, Laurent; Boer, Andries de; Akkerman, Remko; Vlekken, Johan

doi:10.1016/j.compscitech.2007.11.007

Cited by 28 publications

(23 citation statements)

References 21 publications

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“…The practical application of the approach also requires an integrated sensor system, because a laser vibrometer is not feasible in most situations. Distributed strain sensing technologies based on, for example, piezoelectric or fiber optic sensing technologies provide a potential solution . The direct relation between strain and curvature could also be beneficial to overcome the numerical errors involved with the calculation of the curvatures, as discussed in various studies .…”

Section: Discussionmentioning

confidence: 99%

Impact damage identification in composite skin-stiffener structures based on modal curvatures

Ooijevaar

Warnet

Loendersloot

et al. 2015

Struct. Control Health Monit.

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Summary The feasibility of a vibration‐based damage identification approach for impact damage in two advanced composite skin‐stiffener structures is investigated in this paper. Mode shape curvatures combined with the modal strain energy damage index (MSE‐DI) algorithm are utilized to identify the damage. Special attention is paid to the effective application of this vibration‐based methodology by investigating the relation between the damage location, the structural design, and the dynamic behavior. The performance of a 1D and 2D formulation of the MSE‐DI algorithm is compared for several damage scenarios. Experiments demonstrated the capabilities of the MSE‐DI algorithm to detect, localize, and roughly quantify the size of barely visible impact damage in advanced composite structures. It is concluded that the method is particularly effective for health monitoring of skin‐stiffener connections. The most effective results were obtained by considering the 1D formulation in the direction of the stiffeners for the stiffener mid‐section and perpendicular to the stiffeners for the stiffener run‐out. The method remained inconclusive in the case of pure skin‐related damage. The results obtained in this study contribute to the development of guidelines for vibration‐based structural health monitoring of advanced composite skin‐stiffener structures. Copyright © 2015 John Wiley & Sons, Ltd.

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Section: Discussionmentioning

confidence: 99%

Impact damage identification in composite skin-stiffener structures based on modal curvatures

Ooijevaar

Warnet

Loendersloot

et al. 2015

Struct. Control Health Monit.

Self Cite

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“…Taking equation (16) into equation (10) and simplifying the resulting equations it is possible to reduce the system of PDEs into system of ODEs in the form of…”

Section: Undelaminated Partmentioning

confidence: 99%

“…In the delaminated part, the solution by equation (16) can be used as well. Based on the previous section, the state-space model of delaminated part (region (3) in Figure 1) can be constructed similarly using equation (15), the results are documented in Reddy 132 and Ye, 139 therefore the details are omitted here.…”

Section: Delaminated Partmentioning

confidence: 99%

Natural vibration-induced parametric excitation in delaminated Kirchhoff plates

Szekrényes

2015

Journal of Composite Materials

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This paper revisits the problem of free vibration of delaminated composite plates with Lévy type boundary conditions. The governing equations are derived for laminated Kirchhoff plates including through-width delamination. The plate is divided into two subplates in the plane of the delamination. The kinematic continuity of the undelaminated part is established by using the system of exact kinematic conditions. The free vibration analysis of orthotropic simply supported Lévy plates reveals that the delaminated parts are subjected to periodic normal and in-plane shear forces. This effect induces parametric excitation leading to the susceptibility of the plates to dynamic delamination buckling during the vibration. An important aspect is that depending on the vibration mode the internal forces have a two-dimensional distribution in the plane of the delamination. To solve the dynamic stability problem the finite element matrices of the delaminated parts are developed. The distribution of the internal forces in the direction of the delamination front was considered. The mode shapes including a half-wave along the width of the plate accompanied by delamination buckling are shown based on the subsequent superimposition of the buckling eigenshapes. The analysis reveals that the vibration phenomenon is amplitude dependent. Also, the phase plane portraits are created for some chosen cases showing some special trajectories. KeywordsDelamination, free vibration, laminated plate theory, dynamic stability, parametric excitation, harmonic balance, finite element method IntroductionDelaminations are typical defects in composite and sandwich structures induced by indentations (e.g. local loading by spherical indentors), 1,2 low-velocity impact and free edge effects (normal and shear stress concentration between layers at free edges), 3-6 finally by fabrication defects. 7,8 The cracks and delaminations reduce significantly the strength and stiffness of composite laminates.9-11 The material defects also influence the dynamic behavior of the structures.12-20 One of the widely known dynamic phenomena is parametric excitation, which takes place in machine tools, 21 [73][74][75][76][77][78] and sandwich beams. 79In Burlayenko and Sadowski, 80 the foam/core debonding in sandwich plates was investigated during free vibration. However, the existence of the parametric excitation was not revealed in any of the former papers.To the best of the author's knowledge, the existence of the parametric excitation in the course of free vibration of delaminated composite beams was first revealed in Szekre´nyes 81 and was solved effectively by the FE and harmonic balance methods in Szekre´nyes.82 It was also shown that the delamination buckling takes place only if the free vibration amplitude exceeds the so-called critical amplitude at a specified point of the beam. The existence of the critical amplitude was also proved experimentally. The parametric excitation in delaminated plates is possible to appear, as well. 9,10,[127][128][129] subseq...

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“…Such information can then be applied for damage detection and identification within the airframe. The final approach is to use the FBG strain as a function of time for dynamic analysis of the structural behavior including modal analysis to detect delaminations and impact localization [16][17][18][19][20]. It is this third use of the FBG strain information that we will target in this work.…”

Section: Introductionmentioning

confidence: 99%

Instrumentation of integrally stiffened composite panel with fiber Bragg grating sensors for vibration measurements

Oman

Hoe

Aly

et al. 2015

Smart Mater. Struct.

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We evaluate the performance of fiber Bragg grating (FBG) sensors for the measurement of dynamic strains in complex composite structures. The particular structure used in this study is an integrally stiffened composite panel for which the stiffeners and skin are fabricated in a single layup and cure process. Surface-mounted FBG sensors are bonded to the panels after curing, whereas embedded FBG sensors are successfully incorporated during the fabrication process. A finite element model was also constructed of the stiffened panel. The panels were subjected to repeated impacts and the post-impact vibration response of the panel was measured through the FBG sensor responses. Little change to the global response of the panel was observed after the repeated impacts, through the dynamic response of the surface-mounted FBGs. Pulsed phase thermography and micro-computer-tomography imaging of the panel confirmed that the damage was localized near the impact locations, producing negligible changes to the global response of the panel. All of the embedded FBG sensors survived the fabrication and multiple impacts; however, as these were embedded close to the neutral axis of the panel, they were not very sensitive to the vibration modes. Excitation of the panel near the first natural frequency did produce a measurable response in the FBG sensors, confirming their functionality.

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Delamination detection with fibre Bragg gratings based on dynamic behaviour

Cited by 28 publications

References 21 publications

Impact damage identification in composite skin-stiffener structures based on modal curvatures

Impact damage identification in composite skin-stiffener structures based on modal curvatures

Natural vibration-induced parametric excitation in delaminated Kirchhoff plates

Instrumentation of integrally stiffened composite panel with fiber Bragg grating sensors for vibration measurements

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