scholarly journals Hierarchical approach for uncertainty quantification and reliability assessment of guided wave-based structural health monitoring

2020 ◽  
pp. 147592172094064
Author(s):  
Nan Yue ◽  
M.H. Aliabadi
Keyword(s):  
Structural Health Monitoring ◽  
Carbon Fibre ◽  
Health Monitoring ◽  
Impact Damage ◽  
Guided Wave ◽  
Hierarchical Approach ◽  
Structural Health ◽  
Reinforced Polymer ◽  
Carbon Fibre Reinforced Polymer ◽  
Fibre Reinforced Polymer

In this article, a hierarchical approach is proposed for the design and assessment of a guided wave-based structural health monitoring system for the detection and localisation of barely visible impact damage in composite airframe structures. The hierarchical approach provides a systemic and practical way to establish guided wave-based structural health monitoring systems for different structures in the presence of uncertainties and to quantify system performance. The proposed approach is carried out in four steps: (1) determine optimal sensor placement for the target structure and its plausible impact scenarios, (2) set detection threshold for global damage index based on the noise level present in the required environmental and operations conditions, (3) detect damage in critical locations and quantify detection performance by calculating the probability of detection, probability of false alarm and detection accuracy and (4) locate the detected damage while also quantifying the accuracy of location estimation and the probability of correctly indicating if the damage is in an area critical to the integrity of the structure. The proposed approach is demonstrated in aircraft carbon fibre-reinforced polymer structures from coupon level (simple flat panels) to sub-component level (large flat panel with multiple carbon fibre-reinforced polymer stringers and aluminium frames) for the detection and localisation of barely visible impact damage.

scholarly journals Guided wave temperature correction methods in structural health monitoring

2016 ◽  
Vol 28 (5) ◽  
pp. 604-618 ◽  
Author(s):  
MS Salmanpour ◽  
Z Sharif Khodaei ◽  
MH Aliabadi
Keyword(s):  
Health Monitoring ◽  
Lamb Waves ◽  
Impact Damage ◽  
Temperature Correction ◽  
Guided Wave ◽  
Large Temperature ◽  
Reinforced Polymer ◽  
Carbon Fibre Reinforced Polymer ◽  
Minimum Residual ◽  
Fibre Reinforced Polymer

In this article, a method for addressing temperature effects using Lamb waves is developed with application to baseline comparison damage detection. The proposed method is based on baseline signal stretch with an improved minimum residual allowing correction over a larger temperature range. The effectiveness of the proposed approach in detecting (artificial) damages is demonstrated experimentally over a large temperature. The method is also shown to accurately detect and localise a crack in an aluminium panel and actual impact damage on a carbon fibre reinforced polymer panel.

Analysis of barely visible impact damage severity with ultrasonic guided Lamb waves

2019 ◽  
Vol 19 (4) ◽  
pp. 1104-1122 ◽  
Author(s):  
Ifan Dafydd ◽  
Zahra Sharif Khodaei
Keyword(s):  
Carbon Fibre ◽  
Lamb Waves ◽  
Impact Damage ◽  
Laser Doppler Vibrometer ◽  
Laser Doppler ◽  
Acquisition Time ◽  
Reinforced Polymer ◽  
Carbon Fibre Reinforced Polymer ◽  
Text Mode ◽  
Fibre Reinforced Polymer

Barely visible impact damage is one of the most common types of damage in carbon-fibre-reinforced polymer composite structures. This article investigates the potential of using ultrasonic guided Lamb waves to characterise the through thickness severity of barely visible impact damage in thin carbon-fibre-reinforced polymer structures. In the first step, a laser Doppler vibrometer was used to capture the full damage interaction of the wavefield excited by a piezoelectric actuator. Damage-scattered wavefield for four different severities were studied to find the best parameters for characterising the severity of damage. To reduce the overall acquisition time and size of data collected using the laser Doppler vibrometer, the measured signals were reconstructed from a singular broadband chirp response using a post-processing algorithm. From the full wavefield analysis obtained at a wide range of toneburst frequencies, the results showed that barely visible impact damage severity could be characterised using ultrasonic guided Lamb waves and that the [Formula: see text] mode, dominant at lower frequencies, gave better results than the [Formula: see text] mode. In the second step, the parameters for characterising the damage severity were applied to a sparse network of transducers as an in-service structural health monitoring methodology. The damage was successfully detected and located. In addition, the transducer path close to the predicted damage location was utilised to successfully quantify the damage severity based on the proposed damage index.

scholarly journals Design and Development of Magnetostrictive Actuators and Sensors for Structural Health Monitoring

Sensors ◽  
2020 ◽  
Vol 20 (3) ◽  
pp. 711 ◽  
Author(s):  
Jamin Daniel Selvakumar Vincent ◽  
Michelle Rodrigues ◽  
Zhaoyuan Leong ◽  
Nicola A. Morley
Keyword(s):  
Structural Health Monitoring ◽  
Surface Area ◽  
Health Monitoring ◽  
Cost Effective ◽  
Structural Health ◽  
Rlc Circuit ◽  
Magnetostrictive Actuators ◽  
Carbon Fibre Reinforced Polymer ◽  
Fibre Reinforced Polymer ◽  
New Sensors

Carbon Fibre Reinforced Polymer composite (CFRP) is widely used in the aerospace industry, but is prone to delamination, which is a major causes of failure. Structural Health Monitoring (SHM) systems need to be developed to determine the damage occurring within it. Our motivation is to design cost-effective new sensors and a data acquisition system for magnetostrictive structural health monitoring of aerospace composites using a simple RLC circuit. The developed system is tested on magnetostrictive FeSiB and CoSiB actuator ribbons using a bending rig. Our results show detectable sensitivity of inductors as low as 0.6 μH for a bending rig radii between 600 to 300 mm (equivalent to 0.8 to 1.7 mStrain), which show a strain sensitivity resolution of 0.01 μStrain (surface area: ~36 mm2). This value is at the detectability limit of our fabricated system. The best resolution (1.86 μStrain) was obtained from a 70-turn copper (~64 μH) wire inductor (surface area: ~400 mm2) that was paired with a FeSiB actuator.

Impact resonance method for damage detection in carbon-fibre-reinforced polymer–strengthened reinforced concrete beams subjected to fatigue and thermal cycling

2008 ◽  
Vol 35 (11) ◽  
pp. 1251-1260 ◽  
Author(s):  
C. Ward ◽  
N. Rattanawangcharoen ◽  
C. Gheorghiu
Keyword(s):  
Reinforced Concrete ◽  
Carbon Fibre ◽  
Resonance Method ◽  
Experimental Program ◽  
Rc Beams ◽  
Structural Health ◽  
Reinforced Polymer ◽  
Carbon Fibre Reinforced Polymer ◽  
Fibre Reinforced Polymer ◽  
Impact Resonance

Much of North America’s civil infrastructure is rapidly aging and, in some cases, exceeding its design life and load. To combat this, the exploration of simple and effective methods for rehabilitation and structural health monitoring has been receiving much attention in industry and academia. This paper reports on the use of the impact resonance method (IRM) for evaluating the structural health of thermal-cycled reinforced concrete (RC) beams with and without externally strengthened carbon-fibre-reinforced polymer (CFRP) pultruded plates. In the experimental program, 1.2 m long specimens were subjected to 55 thermal cycles ranging from +23 to −18 °C. Fatigue loading consisting of up to two million cycles at high and low stress levels was performed. At pre-determined load cycle intervals, the loading was stopped and the IRM was performed on the specimens. Parameters including the appearance of the fast Fourier transform (FFT) spectrum of the specimens’ vibration, modal fundamental frequencies, and dynamic properties were used to assess damage in the specimen. Conclusions were made regarding the use of the IRM in monitoring the health of strengthened and unstrengthened RC beams subjected to thermal and fatigue cycles.

Temperature and damage influence on electromechanical impedance method used for carbon fibre–reinforced polymer panels

2016 ◽  
Vol 28 (6) ◽  
pp. 782-798 ◽  
Author(s):  
Tomasz Wandowski ◽  
Pawel H Malinowski ◽  
Wieslaw M Ostachowicz
Keyword(s):  
Carbon Fibre ◽  
Damage Detection ◽  
Low Frequency ◽  
Guided Wave ◽  
Impedance Method ◽  
Electromechanical Impedance ◽  
Reinforced Polymer ◽  
Guided Wave Propagation ◽  
Carbon Fibre Reinforced Polymer ◽  
Fibre Reinforced Polymer

This article deals with damage detection process under varying temperature. Carbon fibre–reinforced polymer samples are investigated using electromechanical impedance method. In the article, influence of changing temperature on resistance in electromechanical impedance is investigated. Authors propose new approach for compensation of temperature influence on damage detection. Damage detection is based on root mean square deviation index. Due to strong damping of utilized composite material, low-frequency range is utilized in this research. Real part of electromechanical impedance is measured for frequency band 1–20 kHz. Damage is in the form of artificially made delamination with different sizes. Authors also discuss the problem of influence of structure’s boundary condition on low-frequency measurements. In the research, scanning laser vibrometry for guided wave propagation method is utilized for visualization of the introduced delamination.

Distributed Brillouin sensor for structural health monitoring

2007 ◽  
Vol 34 (3) ◽  
pp. 291-297 ◽  
Author(s):  
Fabien Ravet ◽  
Lufan Zou ◽  
Xiaoyi Bao ◽  
Togay Ozbakkaloglu ◽  
Murat Saatcioglu ◽  
...  
Keyword(s):  
Structural Health Monitoring ◽  
Health Monitoring ◽  
Structural Changes ◽  
Structural Health ◽  
Promising Tool ◽  
Reinforced Polymer ◽  
Fibre Reinforced Polymer ◽  
Structural Failures ◽  
Heavy Loads ◽  
Distributed Brillouin Sensor

The distributed Brillouin sensor (DBS) was used to monitor the structural changes in a steel pipe and a composite column subjected to heavy loads. The column was made of concrete reinforced with fibre-reinforced-polymer (FRP) rods and sheets. The test reproduced earthquake-like conditions. The pipe had a length of 2.58 m and diameter of 0.75 m. The DBS measured the strain distribution in both the concrete column and the pipe under various loads. The DBS provided detailed information on the structure's health at the local and global level, before any deformation, cracks, or buckling was visible. This work demonstrates that the DBS is capable of extracting critical information useful to engineers: the engineer's experience and judgement, in conjunction with appropriate data-processing methods, make it possible to anticipate structural failures. The DBS is a promising tool for structural health monitoring.Key words: structural health monitoring, distributed Brillouin sensor, concrete structure, pipeline buckling, strain measurement.

Damage Evaluation of Carbon-Fibre Reinforced Polymer Composites Using Electromagnetic Coupled Spiral Inductors

2015 ◽  
Vol 24 (3) ◽  
pp. 096369351502400 ◽  
Author(s):  
Z. Li ◽  
A. D. Haigh ◽  
C. Soutis ◽  
A.A.P. Gibson ◽  
R. Sloan ◽  
...  
Keyword(s):  
Carbon Fibre ◽  
Impact Damage ◽  
Reinforced Polymer ◽  
Micro Cracks ◽  
Fibre Composites ◽  
Carbon Fibre Reinforced Polymer ◽  
Spiral Inductors ◽  
Fibre Reinforced Polymer ◽  
Carbon Fibre Composites ◽  
Subsurface Defects

This paper presents the application of electromagnetic coupled spiral inductors for the non-destructive evaluation of carbon-fibre reinforced polymer (CFRP) plates. Three types of representative damage in carbon fibre composites are evaluated, i.e. barely visible impact damage (BVID), subsurface defects and internal micro-cracks. This work indicates that the size and location of the subsurface defects can be quantitatively assessed from the signal data acquisition.

Sign in / Sign up

Export Citation Format

Share Document