Delamination Detection in Composite Laminates From Variations of Their Modal Characteristics

DIAZ VALDES, S.H.; SOUTIS, C.

doi:10.1006/jsvi.1999.2403

Cited by 114 publications

(45 citation statements)

References 17 publications

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“…In addition, Table 1 reveals that with the increase in the delamination length, the frequencies obtained using the present analytical model decrease. This is consistent with that predicted using the present FEA model and the findings available in the literature [13,14].…”

Section: Comparison Between the Present Fea And Analytical Modelssupporting

confidence: 94%

Delamination Detection of a Laminated Beam Using Magnetostrictive Composite Sensor and Actuator

Tan

Tong

2007

Journal of Reinforced Plastics and Composites

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This article presents an analytical dynamic model to study the feasibility of sensing a delamination embedded in a cantilever laminated composite beam, which is bonded with an integrated or distributed magnetostrictive layer. The model that includes parameters characterizing a delamination is developed using the classical beam theory and the assumption of constant peel and shear strains through the bond line thickness. A movable sensing and actuation coil is employed to excite the beam system and then to measure the magnetic flux passing through the sensing and actuation coil. Two types of moveable sensing and actuation coil, namely integrated sensing and actuation coil and separated sensing and actuation coil, are introduced in this investigation. Using the present model, the magnetic flux passing through the coil is predicted. Thus, by monitoring the difference of the predicted magnetic flux passing through the coils which encircles the beams with and without a delamination, the presence, location, and size of the delamination embedded in a laminated composite beam will be identified. Finally, a numerical study is conducted to investigate the influence of major parameters on delamination detection sensitivity, and a comparison of the first-and third-order frequencies between the present analytical and finite element analysis models is carried out to verify the present analytical model.KEY WORDS: analytical model, delamination detection, magnetostrictive composite beam, movable sensing and actuation coil (MSAC).

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Section: Comparison Between the Present Fea And Analytical Modelssupporting

confidence: 94%

Delamination Detection of a Laminated Beam Using Magnetostrictive Composite Sensor and Actuator

Tan

Tong

2007

Journal of Reinforced Plastics and Composites

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“…When both ends of a beam are free or being fixed, the natural frequency of a beam by a longitudinal elastic vibration is given by : n=1,2,3….. (2) where, C is phase velocity of beam, L is length of beam, E is elastic coefficient, ρ is density. Substituting the data of table 1) into Equation (2), the natural frequency of a beam, fn is 3.456 kHz.…”

Section: The Impedance Response Of An Normal Structurementioning

confidence: 99%

A basic study on structure damage assessment by quantitative damage detection

et al. 2005

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This work presented a study on development of a practical and quantitative technique for assessment of the structural health condition by piezoelectric Impedance-based technique associated with longitudinal wave propagation. The natural frequency of the object has a tendency of frequency shifting according to hole size corresponded to real structure crack and crack size. In order to estimate the damage condition numerically, the evaluation method of Impedance peak frequency shift ∆F was suggested in this paper.

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“…Therefore, the study of frequency variation due to defects has shown the need for design tolerance estimation as well as structural health monitoring [5]. The effects of frequency decreasing and modal damping increasing due to interlaminate delamination in graphite/epoxy composites have been experimentally investigated by Lai and Young [6].…”

Section: Introductionmentioning

confidence: 99%

Detection of delamination in composite beams using frequency deviations due to concentrated mass loading

Yang

Oyadiji

2016

Composite Structures

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Delamination Detection in Composite Laminates From Variations of Their Modal Characteristics

Cited by 114 publications

References 17 publications

Delamination Detection of a Laminated Beam Using Magnetostrictive Composite Sensor and Actuator

Delamination Detection of a Laminated Beam Using Magnetostrictive Composite Sensor and Actuator

A basic study on structure damage assessment by quantitative damage detection

Detection of delamination in composite beams using frequency deviations due to concentrated mass loading

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