Modeling delaminations in smart composite laminates

Seeley, Charles E.; Chattopadhyay, Aditi

doi:10.2514/6.1996-1276

Cited by 8 publications

(4 citation statements)

References 13 publications

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“…In most of the existing work, the actuators are assumed to be perfectly embedded or bonded to the primary structure. However, it has recently been shown by Seeley and Chattopadhyay [17] that the control authority of smart structures can be significantly mispredicted in the presence of debonding.…”

Section: Introductionmentioning

confidence: 99%

Aeroelastic Control of Smart Composite Plate with Delaminations

Nam¹,

Chattopadhyay²,

Kim³

2000

Journal of Intelligent Material Systems and Structures

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In this paper, aeroelastic performance of smart composite wing in the presence of delaminations is investigated. A control system is designed to enhance the dynamic stability of the delaminated composite wing. The refined higher order theory for analyzing an adaptive composite plate in the presence of delaminations is used. The theory accurately captures the transverse shear deformation through the thickness, which is important in anisotropic composites, particularly in the presence of discrete actuators and sensors and delaminations. The effects of delamination on the aeroelastic characteristics of composite plates are investigated. An active control system is designed to redistribute the loads and to minimize the effect of delamination. The pole placement technique is applied to design the closed loop system by utilizing piezoelectric actuators. Due to delamination, the significant changes in the natural frequencies of the lower modes are observed. This causes the reduction on the flutter speed of the delaminated plate model. The aeroelastic control results show that controller makes the delaminated plate model behave like a normal plate. The controller also reduces a significant amount of the root mean square values of the gust response due to gust.

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Section: Introductionmentioning

confidence: 99%

Aeroelastic Control of Smart Composite Plate with Delaminations

Nam¹,

Chattopadhyay²,

Kim³

2000

Journal of Intelligent Material Systems and Structures

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“…In view of the importance to the development of piezoelectric smart structures, the subject of piezoelectric actuators with partial debonding has received significant attention from the scientific community. The existence of partial debonding in piezoelectric smart structures has been shown to strongly affect the expected performance [27], and the corresponding effect of delamination in smart composite laminates has been experimentally verified [28]. Analysis of the closed-loop vibration control of a smart beam with bonded piezoelectric patches and interfacial adhesive revealed that the partially debonding actuator can cause detectable unusual responses and significant loss of control efficiency [29], which, in turn, could be utilized to detect small interfacial damages in the system [30].…”

Section: Introductionmentioning

confidence: 99%

Modelling and analysis of piezoelectric actuators with partially debonded adhesive layers

Wang

2020

Mathematics and Mechanics of Solids

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In the modelling of thin-sheet piezoelectric actuators, the bonding condition between the actuator and the host structure can place a significant influence on the behaviour of the actuator. This paper provides a comprehensive theoretical study of the electromechanical behaviour of a thin-sheet piezoelectric actuator bonded to a host structure through a partially debonded adhesive layer under in-plane electric loading. The focus is on the coupled effect of the debonding and adhesive layer on the interfacial stress. The piezoelectric actuator is characterized by a general electro-elastic Euler–Bernoulli beam model featuring both axial and bending deformation. The theoretical solution of the problem is formulated by using singular integral equations, in terms of the interfacial shear and normal stresses, which are solved by using Chebyshev polynomials. The introduction of the adhesive layer in the model changes the singular behaviour of the problem. The current singular integral equations are shown to be effective in solving for both singular and non-singular stresses. Typical examples have been provided to show the effect of the geometry and the material property on the local stress field along the interface.

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“…A study carried out by [9] shows that the control of smart structures can be affected by the occurrence of debonding. An analytical and experimental investigation was carried out to identify the effects of delamination on smart beams with bonded piezoelectric actuators [10], and the results of this study showed that edge delaminations origin a decreasing in the natural frequency, however the interior delaminations do not produced change.…”

Section: Introductionmentioning

confidence: 99%

Experimental detection of debonding of piezoelectric sensors with the segmented electrode

Tinoco¹

2019

Preprint

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The piezoelectric transducers (PZT) are bonded to smart structures by means of an intermediate adhesive layer, with the main objectives of applying methodologies of structural health monitoring, nondestructive evaluation, nondestructive inspection and structural control to the structures. However, the application of these methodologies depends on the health of the adhesive joint that couples mechanically the PZT with the structure. This research shows an experimental technique based on the segmentation of electrodes of a PZT patch in sheet form. One electrode is segmented in three equal parts (end left, middle and end right) to obtain three electrical signatures of a PZT. The electrical signatures (voltage) of the end electrodes are related to the middle electrode voltage. Three experiments were carried out in this study: two static cases and one dynamic case. For the static case, the left end (first case) and the right end (first case) were debonded. In the dynamic case, only one side was debonded. The results show that the voltage relations present linear behavior and the changing in the slope of the voltage ratio allows identifying which electrode is debonded. This technique showed to be effective in the three studied cases of debonding and it could be used to identify debonding in real time.

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Modeling delaminations in smart composite laminates

Cited by 8 publications

References 13 publications

Aeroelastic Control of Smart Composite Plate with Delaminations

Aeroelastic Control of Smart Composite Plate with Delaminations

Modelling and analysis of piezoelectric actuators with partially debonded adhesive layers

Experimental detection of debonding of piezoelectric sensors with the segmented electrode

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