Modeling and Numerical Simulations in Nonlinear Acoustics Used for Damage Detection

2018 ◽  
pp. 103-137
Author(s):  
Pawel Packo ◽  
Rafal Radecki ◽  
Michael J. Leamy ◽  
Tadeusz Uhl ◽  
Wieslaw J. Staszewski
Keyword(s):  
Damage Detection ◽  
Numerical Simulations ◽  
Nonlinear Acoustics

Numerical simulations for impact damage detection in composites using vibrothermography

2010 ◽  
Vol 10 ◽  
pp. 012062 ◽  
Author(s):  
L J Pieczonka ◽  
W J Staszewski ◽  
F Aymerich ◽  
T Uhl ◽  
M Szwedo
Keyword(s):  
Damage Detection ◽  
Numerical Simulations ◽  
Impact Damage

A Study on Damage Detection Procedure for Existing Piles

2003 ◽  
Author(s):  
Akira Sone ◽  
Arata Masuda ◽  
Taihei Koyama ◽  
Kohei Washida ◽  
Makoto Yamada ◽  
...  
Keyword(s):  
Damage Detection ◽  
Numerical Simulations ◽  
Ground Surface ◽  
Dynamic Compliance ◽  
Evaluation Procedure ◽  
Damage Evaluation ◽  
Impulsive Load ◽  
Non Destructive

In this paper, a non-destructive damage evaluation procedure is presented, which aims at detecting early or fatal cracks in existing piles after severe earthquakes. The bending motion of a target pile excited by an impulsive load, which is induced by hammering at the ground surface nearly, is measured at the top to obtain the dynamic compliance of the pile in one direction. Numerical simulations and experiments show that evaluating the dynamic compliance in every direction can suggest the severity of the cracks as well as their location and orientation.

scholarly journals A novel formulation of 3D spectral element for wave propagation in reinforced concrete

2017 ◽  
Vol 65 (6) ◽  
pp. 805-813 ◽  
Author(s):  
M. Rucka ◽  
W. Witkowski ◽  
J. Chróścielewski ◽  
S. Burzyński ◽  
K. Wilde
Keyword(s):  
Finite Element ◽  
Wave Propagation ◽  
Reinforced Concrete ◽  
Damage Detection ◽  
Numerical Simulations ◽  
Spectral Element ◽  
Steel Bars ◽  
Degradation Models ◽  
Spectral Finite Element ◽  
3D Solid

AbstractThe paper deals with numerical simulations of wave propagation in reinforced concrete for damage detection purposes. A novel formulation of a 3D spectral element was proposed. The reinforcement modelled as the truss spectral element was embedded in the 3D solid spectral finite element. Numerical simulations have been conducted on cuboid concrete specimens reinforced with two steel bars. Different degradation models were considered to study the real behaviour of bended beams.

scholarly journals Damage Identification of Unreinforced Masonry Panels Using Vibration-Based Techniques

2017 ◽  
Vol 2017 ◽  
pp. 1-14 ◽  
Author(s):  
Claudio Oyarzo-Vera ◽  
Nawawi Chouw
Keyword(s):  
Spatial Distribution ◽  
Damage Detection ◽  
Numerical Simulations ◽  
Damage Identification ◽  
Unreinforced Masonry ◽  
Masonry Structures ◽  
Damage Distribution ◽  
Modal Response ◽  
Damage States ◽  
Damage Indicators

Several damage indicators based on changes in modal properties validated for homogeneous materials were applied to detect damage in an unreinforced masonry cantilever panel. Damage was created by a “clean diagonal cut” at the center of the specimen which length was progressively extended towards the specimen’s corners. Numerical simulations were employed to determine the modal response at several damage states and this data was used to calculate the damage indicators. Those indicators presenting a good performance were then applied to identify damage on a physical specimen tested in the laboratory. The outcomes of this study demonstrated that vibration-based damage detection in unreinforced masonry structures can be satisfactorily performed. However, the identification of the damage spatial distribution using vibration-based methods in unreinforced masonry structures is still difficult. To improve the prediction of damage distribution, a large number of measurement points need to be considered to obtain an acceptable level of resolution.

Sensor Location Analysis in Nonlinear Acoustics Used for Damage Detection in Composite Chiral Sandwich Panels

2012 ◽  
Vol 83 ◽  
pp. 223-231 ◽  
Author(s):  
Andrzej Klepka ◽  
Wieslaw Jerzy Staszewski ◽  
Dario di Maio ◽  
Fabrizio Scarpa ◽  
Kong Fah Tee ◽  
...  
Keyword(s):  
Damage Detection ◽  
High Frequency ◽  
Low Frequency ◽  
Nonlinear Acoustics ◽  
Location Analysis ◽  
Sensor Location ◽  
Ultrasonic Sensing ◽  
Low Profile ◽  
Frequency Excitation ◽  
Vibration Wave

This paper demonstrates damage detection in a smart sandwich panel with integrated piezoceramic transducers. The panel is built from a chiral honeycomb and two composite skins. A low-profile, surface-bonded piezoceramic transducer is used for high-frequency ultrasonic excitation. Low-frequency excitation is performed using a piezoceramic stack actuator. Ultrasonic sensing is performed using laser vibrometry. Nonlinear acoustics is applied for damage detection. The study is focused on sensor location analysis with respect to vibro-acoustic wave modulations. The paper demonstrates that when structure is damaged, the high-frequency “weak” ultrasonic wave is modulated by the low-frequency “strong” vibration wave. As a result frequency sidebands can be observed around the main acoustic harmonic in the spectrum of the ultrasonic signal. However, intensity of modulation strongly depends on sensor location.

Impact Damage Detection in Composite Chiral Sandwich Panels

2012 ◽  
Vol 518 ◽  
pp. 160-167 ◽  
Author(s):  
Andrzej Klepka ◽  
Wieslaw Jerzy Staszewski ◽  
T. Uhl ◽  
Dario di Maio ◽  
Fabrizio Scarpa ◽  
...  
Keyword(s):  
Damage Detection ◽  
Ultrasonic Wave ◽  
High Frequency ◽  
Impact Damage ◽  
Low Frequency ◽  
Nonlinear Acoustics ◽  
Composite Panel ◽  
Chiral Structures ◽  
Low Frequency Vibration ◽  
Vibration Wave

This paper demonstrates impact damage detection in a composite sandwich panel. The panel is built from a chiral honeycomb and two composite skins. Chiral structures are a subset of auxetic solids exhibiting counterintuitive deformation mechanism and rotative but not reflective symmetry. Damage detection is performed using nonlinear acoustics,involves combined vibro-acoustic interaction of high-frequency ultrasonic wave and low-frequency vibration excitation. High-and low-frequency excitations are introduced to the panel using a low-profile piezoceramic transducer and an electromagnetic shaker, respectively. Vibro-acoustic modulated responses are measured using laser vibrometry. The methods used for impact damage detection clearly reveal de-bonding in the composite panel. The high-frequency weak ultrasonic wave is also modulated by the low-frequency strong vibration wave when nonlinear acoustics is used for damage detection. As a result frequency sidebands can be observed around the main acoustic harmonic in the spectrum of the ultrasonic signal.

Modelling and numerical simulations of vibrothermography for impact damage detection in composites structures

2012 ◽  
Vol 20 (4) ◽  
pp. 626-638 ◽  
Author(s):  
L. Pieczonka ◽  
F. Aymerich ◽  
G. Brozek ◽  
M. Szwedo ◽  
W. J. Staszewski ◽  
...  
Keyword(s):  
Damage Detection ◽  
Numerical Simulations ◽  
Impact Damage

Performance evaluation of damage detection algorithms for identification of debond in stiffened metallic plates using a scanning laser vibrometer

2017 ◽  
Vol 24 (12) ◽  
pp. 2464-2482 ◽  
Author(s):  
Deba Datta Mandal ◽  
Debashis Wadadar ◽  
Sauvik Banerjee
Keyword(s):  
Fractal Dimension ◽  
Damage Detection ◽  
Numerical Simulations ◽  
Laser Doppler Vibrometer ◽  
Composite Plates ◽  
Experimental Investigations ◽  
Laser Vibrometer ◽  
Detection Algorithms ◽  
Metallic Plates ◽  
Comprehensive Studies

While several studies have focused on the detection and localization of delamination in composite plates, few comprehensive studies have been performed for the identification of debond in stiffened metallic plates using vibration-based approaches. Therefore, this study is motivated by the need to evaluate the qualitative performance of existing damage detection algorithms, namely modal curvature, the gapped smoothing method (GSM), the generalized fractal dimension (GFD) and the wavelet transform coefficient (WTC), in detecting debond in stiffened metallic plates. Extensive experimental investigation is performed using laser Doppler vibrometer as a noncontact sensing device and LDS Permanent Magnetic Shaker as an actuator. The obtained results show high susceptibility to noise and lesser accuracy in locating the debond zone, except the WTC and GFD. However, the WTC fails to provide good results for higher debond lengths, and the GFD shows prominent false alarms at the free edges of the plates. To circumvent these difficulties, two different modifications of the fractal dimension algorithm, namely the modified GFD (MGFD) and the GFD with GSM (GFD-GSM), have been proposed. Extensive numerical simulations are further carried out using commercially available finite element package ANSYS 14.0 in order to examine the experimental findings. In contrast to most previous work, the signal-to-noise ratio (SNR) in the experimental data has been appropriately quantified and noise of the same SNR level has been synthetically generated and applied on the modal data obtained from numerical simulations. Comprehensive studies for different debond locations and lengths suggests a similar trend as that obtained from the experimental investigations. Finally, a study on damage severity has been performed using the WTC and proposed modifications of the GFD. It is found that the proposed modifications of the fractal dimension perform outstandingly well in all circumstances, and can be used as an excellent tool for debond localization and quantification.

Impact damage detection in smart composites using nonlinear acoustics—cointegration analysis for removal of undesired load effect

2017 ◽  
Vol 26 (3) ◽  
pp. 035012 ◽  
Author(s):  
Phong B Dao ◽  
Andrzej Klepka ◽  
Łukasz Pieczonka ◽  
Francesco Aymerich ◽  
Wieslaw J Staszewski
Keyword(s):  
Damage Detection ◽  
Impact Damage ◽  
Nonlinear Acoustics ◽  
Cointegration Analysis ◽  
Load Effect ◽  
Smart Composites
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