Damage Tolerance of Naval Sandwich Panels

Zenkert, Dan

doi:10.1007/978-90-481-3141-9_11

Cited by 90 publications

(142 citation statements)

References 34 publications

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“…The damage types were selected according to their often occurrence during manufacturing and in-service maintenance in foam cored sandwich structures used in various engineering applications. 15,21,23…”

Section: Specimens Preparationmentioning

confidence: 99%

Vibration-Based Non-Destructive Evaluation of Internal Damage in Foam Cored Sandwich Structures Using Wavelet Analysis

Katunin¹

2019

The International Journal of Acoustics and Vibration

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Modern mechanical and civil structures are increasingly designed using polymeric composites that ensure great strength-to-mass ratio and are resistant to various environmental interactions, like corrosion. The application of sandwich structures in the design of mechanical and civil constructions is determined by their good stiffness properties and very low mass, which is a very attractive combination. Due to their wide applicability, these structures should be properly maintained and diagnosed, and thus, appropriate non-destructive testing (NDT) methods should be developed in order to detect and identify various types of damage. Special attention should be paid to internal damage (damage to the core of a sandwich structure), which cannot be detected during a visual inspection. In the paper, an NDT method based on modal analysis and further processing of modal shapes using a wavelet transform is proposed. Three sandwich structures with damage to the core of various types were experimentally tested using modal analysis, the damage positions were detected and identified using wavelet analysis, and verified by comparing the results of previously performed thermographic tests. The obtained results show a high effectiveness of the proposed approach, which could find an application in the industrial inspection of sandwich structures in a non-destructive and non-contact manner.

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Section: Specimens Preparationmentioning

confidence: 99%

Vibration-Based Non-Destructive Evaluation of Internal Damage in Foam Cored Sandwich Structures Using Wavelet Analysis

Katunin¹

2019

The International Journal of Acoustics and Vibration

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“…Carbon-fibre reinforced composite (CFRC) structures are widely used in the aerospace, automotive and marine industries, due to their effective fire and corrosion resistance, acoustic insulation, high stiffness/weight ratios, construction flexibilities and lightweight advantages [1,2,3,4]. In several construction requirements, two or more such composite laminates are bonded with epoxy adhesives and debonds can occur at such adhesive interfaces, due to temperature fluctuations, improper handling, impact, fatigue and ageing [5,6,7,8,9]. Hence, fast and effective nondestructive evaluation and structural health monitoring (SHM) strategies are required to detect such hidden debonds under variable ambient temperature conditions, in order to avoid catastrophic failures while the structure is in-service [9,10].…”

Section: Introductionmentioning

confidence: 99%

“…Ultrasonic guided wave propagation-based SHM strategies have proven their potential to effectively identify hidden defects in complex layered materials [7,8,9,10,11,12,13,14,15]. As the piezoelectric transducer (PZT)-induced guided wave propagation-based SHM techniques offer long-distance inspection potential due to the penetration capacity into different layers in the composites with less attenuation [12,13,14,15].…”

Section: Introductionmentioning

confidence: 99%

Nondestructive Analysis of Debonds in a Composite Structure under Variable Temperature Conditions

Sikdar

Kundu

Jurek

et al. 2019

Sensors

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This paper presents a nondestructive analysis of debonds in an adhesively-bonded carbon-fibre reinforced composite structure under variable temperature conditions. Towards this, ultrasonic guided wave propagation based experimental analysis and numerical simulations are carried out for a sample composite structure to investigate the wave propagation characteristics and detect debonds under variable operating temperature conditions. The analysis revealed that the presence of debonds in the structure significantly reduces the wave mode amplitudes, and this effect further increases with the increase in ambient temperature and debond size. Based on the debond induced differential amplitude phenomenon, an online monitoring strategy is proposed that directly uses the guided wave signals from the distributed piezoelectric sensor network to localize the hidden debonds in the structure. Debond index maps generated from the proposed monitoring strategy show the debond identification potential in the adhesively-bonded composite structure. The accuracy of the monitoring strategy is successfully verified with non-contact active infrared-thermography analysis results. The effectiveness of the proposed monitoring strategy is further investigated for the variable debond size and ambient temperature conditions. The study establishes the potential for using the proposed damage index constructed from the differential guided wave signal features as a basis for localization and characterization of debond damages in operational composite structures.

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“…Since fiber-reinforced composite structures offer superior strength, higher stiffness, lighter weight and greater durability [1], they are increasingly being used for primary aircraft components traditionally made of metallic materials. However, despite their good properties, composite airframe structures are more sensitive to impact damage, which can cause disbonding, delamination and internal crushing.…”

Section: Introductionmentioning

confidence: 99%

Mechanical performance of repaired sandwich panels: Experimental characterization and finite-element modelling

Ghazali

Dano

Gakwaya

et al. 2017

Jnl of Sandwich Structures & Materials

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This paper describes the static performance of adhesively bonded repairs on sandwich panels made with carbon-epoxy composite skins and a Nomex core. First, the mechanical behaviour of pristine and repaired panels under tensile loading was studied. All tests were conducted under room temperature conditions. Then, finite-element analyses were performed to predict the behaviour of repaired panels. Two material models were developed for the adhesive joint: one was linear elastic and the second was elastic-plastic with a shear failure criterion. For the composite skins, an orthotropic linear elastic model was used. Numerical model predictions are in good agreement with the experimental results. It was found also that the strength recovery of the repaired structure increases with the decrease of the scarf angle.

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Damage Tolerance of Naval Sandwich Panels

Cited by 90 publications

References 34 publications

Vibration-Based Non-Destructive Evaluation of Internal Damage in Foam Cored Sandwich Structures Using Wavelet Analysis

Vibration-Based Non-Destructive Evaluation of Internal Damage in Foam Cored Sandwich Structures Using Wavelet Analysis

Nondestructive Analysis of Debonds in a Composite Structure under Variable Temperature Conditions

Mechanical performance of repaired sandwich panels: Experimental characterization and finite-element modelling

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