Multiple debondings' detection in honeycomb sandwich structures using multi-frequency elastic guided waves

2010 ◽  
Author(s):  
S. Haran ◽  
G. L. Huang ◽  
J. H. Kim ◽  
F. Song
Keyword(s):  
Guided Waves ◽  
Sandwich Structures ◽  
Honeycomb Sandwich

scholarly journals Core–skin debonding detection in honeycomb sandwich structures through guided wave wavefield analysis

2018 ◽  
Vol 30 (9) ◽  
pp. 1306-1317 ◽  
Author(s):  
Lingyu Yu ◽  
Zhenhua Tian ◽  
Xiaopeng Li ◽  
Rui Zhu ◽  
Guoliang Huang
Keyword(s):  
Guided Waves ◽  
Sandwich Structures ◽  
Lamb Waves ◽  
Laser Doppler Vibrometer ◽  
Low Frequency ◽  
Guided Wave ◽  
Honeycomb Sandwich ◽  
Debonding Detection ◽  
The Waves ◽  
Detection And Quantification

Ultrasonic guided waves have proven to be an effective and efficient method for damage detection and quantification in various plate-like structures. In honeycomb sandwich structures, wave propagation and interaction with typical defects such as hidden debonding damage are complicated; hence, the detection of defects using guided waves remains a challenging problem. The work presented in this article investigates the interaction of low-frequency guided waves with core–skin debonding damage in aluminum core honeycomb sandwich structures using finite element simulations. Due to debonding damage, the waves propagating in the debonded skin panel change to fundamental antisymmetric Lamb waves with different wavenumber values. Exploiting this mechanism, experimental inspection using a non-contact laser Doppler vibrometer was performed to acquire wavefield data from pristine and debonded structures. The data were then processed and analyzed with two wavefield data–based imaging approaches, the filter reconstruction imaging and the spatial wavenumber imaging. Both approaches can clearly indicate the presence, location, and size of the debonding in the structures, thus proving to be effective methods for debonding detection and quantification for honeycomb sandwich structures.

Wavenumber study of guided waves in aluminum honeycomb sandwich structures

2015 ◽  
Author(s):  
Zhenhua Tian ◽  
Lingyu Yu ◽  
Guoliang Huang ◽  
Michel van Tooren ◽  
Will Mitchell
Keyword(s):  
Guided Waves ◽  
Sandwich Structures ◽  
Honeycomb Sandwich ◽  
Aluminum Honeycomb

An Adjustment-Free NDT Technique for Defect Detection in Multilayered Composite Constructions Using Ultrasonic Guided Waves

2014 ◽  
Vol 14 (08) ◽  
pp. 1440025 ◽  
Author(s):  
Renaldas Raišutis ◽  
Rymantas Kažys ◽  
Liudas Mažeika ◽  
Egidijus Žukauskas ◽  
Vykintas Samaitis ◽  
...  
Keyword(s):  
Guided Waves ◽  
Sandwich Structures ◽  
Multilayered Structure ◽  
Ultrasonic Guided Waves ◽  
The Novel ◽  
Operational Conditions ◽  
Practical Applications ◽  
Wide Range ◽  
Honeycomb Sandwich ◽  
Honeycomb Sandwich Structure

In recent years, the novel lightweight honeycomb sandwich structures have been applied in a wide range of industries. However, daily operational conditions, fatigue, as well as various defects developed during exploitation lead to the risk of structure failure. To meet safety and economical requirements, such structures must be tested. In this paper, an ultrasonic pitch-catch technique based on ultrasonic guided waves (UGW) for detection of defects in honeycomb sandwich structures is proposed. The technique is based on simultaneous scanning of a pair of contact type transmitting and receiving transducers positioned at fixed distance from each other. The proposed technique has been verified by the experiments and simulations on a honeycomb sandwich structure with an aluminium core and carbon fiber skin. The results have shown that different types of internal nonhomogeneities, such as changes in internal multilayered structure, skin delaminations or disbonds between the skin and the core, give the effects of amplitude and phase velocity deviations, which can be detected with accuracy reasonable for practical applications.

Debonding Detection at Core/Skin Interfaces in a Honeycomb Sandwich Structure Using a Laser Ultrasonic Visualization Method

2020 ◽  
Author(s):  
Enhi Sen ◽  
Osamu Saito ◽  
Nobuhiro Higuchi ◽  
Yoji Okabe
Keyword(s):  
Laser Irradiation ◽  
Guided Waves ◽  
Sandwich Panel ◽  
Sandwich Structures ◽  
Ultrasonic Guided Waves ◽  
Visualization Method ◽  
Honeycomb Core ◽  
Laser Ultrasonic ◽  
Honeycomb Sandwich ◽  
Ultrasonic Propagation

Abstract Honeycomb sandwich structures are widely used in aircraft owing to the superior characteristics, such as the light weight, the high specific bending stiffness and the high specific in-plane compressive strength. However the honeycomb sandwich structures are prone to have debonding damages at the interfaces between the skin and the honeycomb core, which degrades the mechanical properties largely. For inspection of damages in plate-like structures, the propagation of ultrasonic guided waves along the plate is effective. In this research, we attempted to detect the debonding at the skin/core interfaces in a honeycomb sandwich panel by using a laser ultrasonic visualization method. Debonding damages were artificially introduced in a sandwich panel consisting of two CFRP skin plates and an aluminum honeycomb core. Then, ultrasonic guided waves were excited in the panel through scanning of a laser irradiation on a surface of the plate and were received by a piezoelectric sensor installed on the same surface by using a laser ultrasonic visualizing inspector. As a result, we obtained visualization animations of the ultrasonic propagation behavior. From the change in the maximum amplitude distribution of the guided wave, we were able to identify the debonding damages at the skin/core interfaces in both the laser-irradiation side and the opposite side. Furthermore, a finite element analysis of the ultrasonic propagation in the honeycomb sandwich panel was conducted to confirm the phenomena observed in the experiments. From the calculation results, the mechanism of the observed phenomena was able to be clarified.

Study of Guided Wave Propagation in Honeycomb Sandwich Structures

2014 ◽  
Author(s):  
Zhenhua Tian ◽  
Guoliang Huang ◽  
Lingyu Yu
Keyword(s):  
Wave Propagation ◽  
Guided Waves ◽  
Sandwich Structures ◽  
Guided Wave ◽  
Experimental Results ◽  
Fe Model ◽  
Laser Vibrometry ◽  
Honeycomb Core ◽  
Guided Wave Propagation ◽  
Honeycomb Sandwich

This paper studies the guided waves in honeycomb sandwich structures and explores the ability of guided waves for the debonding damage detection. Both the finite element (FE) simulations and laser vibrometry experiments are used. A three-dimensional (3D) FE model is built to simulate the guided waves in a honeycomb sandwich plate. The simulation results show the guided waves in the structure depend on the wave frequency. At low frequencies, the global guided waves propagate in the entire sandwich, while leaky guided waves dominate in the skin panel at high frequencies. To further understand the guided wave propagation fundamentals, laser vibrometry experiments are performed. The waveforms, time-space wavefields, and frequency-wavenumber spectra obtained from the experiments are used to unveil the wave propagation features. The experimental results confirm the leaky guided waves. Moreover, the experimental results show the complex wave interactions induced by the honeycomb core. When the debonding between the skin and honeycomb core presents, the guided wave amplitude increases, and the wave interaction with the honeycomb core reduces.

Use of Guided Waves for Inspection of Composite Skin-Honeycomb Core

2010 ◽  
Vol 636-637 ◽  
pp. 1533-1540
Author(s):  
A. Satour ◽  
F. Boubenider ◽  
Ali Badidi Bouda ◽  
Rachid Halimi
Keyword(s):  
Guided Waves ◽  
Sandwich Structures ◽  
Ultrasonic Guided Waves ◽  
Sandwich Plates ◽  
Aircraft Industry ◽  
Honeycomb Core ◽  
The Core ◽  
Honeycomb Sandwich

Sandwich plates, made of two aluminum layers and a metal honey comb core are used in the aircraft industry. The purpose of this study is to show the ultrasonic guided waves sensibility to discover delamination in skin-honeycomb sandwich structures used in aeronautics. Separation between the skin and the core can appear during the manufacture or after use. In this work, Lamb's waves are used to control this kind of plane structure. Indeed, these waves have the advantage to put in vibration the totality of the plate that we want to control and they propagate on long distances without too much attenuation. The revealing, by the guided waves, of the unsticking which can meet on such sandwiches, between the plate and the honeycomb core is studied and commented.

Numerical and experimental investigation for enhancing the energy absorption capacity of the novel three-dimensional printed sandwich structures

2021 ◽  
pp. 146442072199749
Author(s):  
H Geramizadeh ◽  
S Dariushi ◽  
S Jedari Salami
Keyword(s):  
Energy Absorption ◽  
Sandwich Structures ◽  
Three Dimensional ◽  
Absorption Capacity ◽  
The Novel ◽  
Energy Absorption Capacity ◽  
Fused Deposition ◽  
Honeycomb Sandwich ◽  
Out Of Plane ◽  
Vertical Walls

The current study focuses on designing the optimal three-dimensional printed sandwich structures. The main goal is to improve the energy absorption capacity of the out-of-plane honeycomb sandwich beam. The novel Beta VI and Alpha VI were designed in order to achieve this aim. In the Beta VI, the connecting curves (splines) were used instead of the four diagonal walls, while the two vertical walls remained unchanged. The Alpha VI is a step forward on the Beta VI, which was promoted by filleting all angles among the vertical walls, created arcs, and face sheets. The two offered sandwich structures have not hitherto been provided in the literature. All models were designed and simulated by the CATIA and ABAQUS, respectively. The three-dimensional printer fabricated the samples by fused deposition modeling technique. The material properties were determined under tensile, compression, and three-point bending tests. The results are carried out by two methods based on experimental tests and finite element analyses that confirmed each other. The achievements provide novel insights into the determination of the adequate number of unit cells and demonstrate the energy absorption capacity of the Beta VI and Alpha VI are 23.7% and 53.9%, respectively, higher than the out-of-plane honeycomb sandwich structures.

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