Nonlinear dynamic behavior of an impact damaged composite skin–stiffener structure

Ooijevaar, T.H.; Rogge, Matthew D.; Loendersloot, Richard; Warnet, Laurent; Akkerman, Remko; Tinga, Tiedo

doi:10.1016/j.jsv.2015.05.011

Cited by 16 publications

(16 citation statements)

References 20 publications

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“…Although the theoretical model provides an understanding of the relevant aspect involved, it is still difficult to find a physical explanation for the modulation behaviour. It was demonstrated in earlier research [16] that the skin-stiffener damage can open and close under a low frequency excitation. Nonlinear behaviour, as was also shown, can also occur when the skin and the stiffener are approaching each other.…”

Section: Resultsmentioning

confidence: 92%

“…The same vibro-acoustic measurement is performed at multiple locations, all directly underneath the stiffener. The local changes in amplitude and phase of the low frequency part of the response, shown in figure 4a, are caused by the damaged skin-stiffener interface as discussed in [16]. The velocity distribution obtained after applying the f c ± 10 kHz bandpass filter is depicted in figure 4b.…”

Section: Resultsmentioning

confidence: 94%

“…Earlier research of the authors [16] revealed that the 4 th (1455 Hz) bending frequency exhibits a clear nonlinear response in the region of the delamination. The earlier research focussed on the low frequency part of the response, using a single tone excitation.…”

Section: F(t)mentioning

confidence: 95%

“…This work concentrates on the same composite specimen and set-up as was utilized in earlier research by the present authors. 26 Only the damaged structure was considered in the analysis. The low-frequency pump excitation was applied by a shaker, while a piezoelectric diaphragm was used to simultaneously apply a high-frequency carrier excitation.…”

Section: Objective and Outlinementioning

confidence: 99%

See 3 more Smart Citations

Vibro-acoustic modulation–based damage identification in a composite skin–stiffener structure

Ooijevaar

Rogge

Loendersloot

et al. 2016

Structural Health Monitoring

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The vibro-acoustic modulation method is applied to a composite skin-stiffener structure to investigate the possibilities to utilise this method for damage identification in terms of detection, localisation and damage quantification. The research comprises a theoretical part and an experimental part. An impact load is applied to the skin-stiffener structure, resulting in a delamination underneath the stiffener. The structure is interrogated with a low frequency pump excitation and a high frequency carrier excitation. The analysis of the response in a frequency band around the carrier frequency is employed to assess the damage identification capabilities and to gain a better understanding of the modulations occurring and the underlying physical phenomena. Though vibro-acoustic is shown to be a sensitive method for damage identification, the complexity of the damage, combined with a high modal density, complicate the understanding of the relation between the physical phenomena and the modulations occurring.

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Section: Resultsmentioning

confidence: 92%

Section: Resultsmentioning

confidence: 94%

Section: F(t)mentioning

confidence: 95%

Section: Objective and Outlinementioning

confidence: 99%

See 2 more Smart Citations

Vibro-acoustic modulation–based damage identification in a composite skin–stiffener structure

Ooijevaar

Rogge

Loendersloot

et al. 2016

Structural Health Monitoring

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show abstract

“…The above procedure is called the fractional energy method (Worden et al, 2008). Several studies have shown the applicability of the fractional energy method using the linear modal strain energy to locate conventional damage with sizable damage due to axial and torsional loads (Duffey et al, 2001), as well as impact (Ooijevaar et al, 2015). Typically, a fractional energy factor, F i , is calculated, which is the ratio of the change in the strain energy in segment i , as follows…”

Section: Structural Statesmentioning

confidence: 99%

Structural state awareness through integration of global dynamic and local material behavior

Habtour

Cole

Kube

et al. 2019

Journal of Intelligent Material Systems and Structures

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Structural health monitoring and nondestructive inspection techniques typically assess the lifecycle and reliability of high-value aerospace, mechanical, and civil systems. Maintenance and inspection intervals are typically time-based and dependent on the structural health monitoring/nondestructive inspection technique to detect macroscale damage resulting from fatigue or environmental damage. The current work proposes an integrated materials-structures-dynamics approach for providing state awareness of structural health. The proposed approach shifts the conventional structural health monitoring/nondestructive inspection focus of searching for cracks to a health state awareness based on tracking changes in the energetics of the materials-structures-dynamics states. Energy variations are tracked in a cantilevered structure exposed to nonlinear harmonic oscillation, where the strain energy of the beam was derived and used to determine a health state index. Nanoindentation was used to probe the near-surface mechanical properties of the beam to characterize local material variations as a function of fatigue cycles. A nonlinear ultrasonic approach was considered in order to connect the local material behavior changes to the variations in the dynamic performance of the beam. The intent of the investigation was to connect the traditionally detached materials, structural, and dynamics approaches to structural health monitoring/nondestructive inspection, while providing a framework for enabling damage precursor detection.

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Strain Sensing with Metamaterial Composites

Everitt

Tyler

Caraway

et al. 2019

Advanced Optical Materials

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Mapping strain fields in visually opaque structural composites -for which failure is often sudden, irreparable, and even catastrophic -requires techniques to locate and record regions of stress, fatigue, and incipient failure. Many composite materials are transparent in the terahertz spectral region, but their strain history is often too subtle to recover. Here, terahertz metamaterials with strain-severable junctions are introduced that can identify structurally compromised regions of composite materials. Specifically, multi-layer arrays of aluminum meta-atoms were designed and fabricated as strip dipole antennas with a terahertz frequency resonance and a strong response to cross polarized radiation that disappears when local stress irreversibly breaks their bowtie-shaped junction. By spatially mapping the local polarimetric response of this metamaterial as a function of global strain, the regions of local stress extrema experienced by a visually opaque material may be visualized. This proof-of-concept demonstration heralds the opportunity for embedding metamaterial laminates within composites to record and recover their strain-dependent history of fatigue.The widespread proliferation of composite materials in civilian, industrial, and military sectors has created a need for tools to monitor their structural health and warn of incipient failure. Many techniques have been tried, including embedded sensors, laser surface mapping, acoustic transducers, x-ray imaging, and terahertz imaging concepts. [1][2][3][4][5][6] The opacity of most composites prevents the use of common optical polarimetric techniques for measuring photoelasticity, while stress-induced birefringence produces weak refractive index anisotropies at terahertz frequencies that are difficult to measure. [7,8] Many of these techniques can identify damaged regions, but none Received: ((will be filled in by the editorial staff))Revised: ((will be filled in by the editorial staff))

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Nonlinear dynamic behavior of an impact damaged composite skin–stiffener structure

Cited by 16 publications

References 20 publications

Vibro-acoustic modulation–based damage identification in a composite skin–stiffener structure

Vibro-acoustic modulation–based damage identification in a composite skin–stiffener structure

Structural state awareness through integration of global dynamic and local material behavior

Strain Sensing with Metamaterial Composites

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