Open Access. Powered by Scholars. Published by Universities.®

Engineering Commons

Open Access. Powered by Scholars. Published by Universities.®

Review of Progress in Quantitative Nondestructive Evaluation

Discipline
Keyword
Publication Year
File Type

Articles 1 - 30 of 2651

Full-Text Articles in Engineering

Non Destructive Evaluation Of Containment Walls In Nuclear Power Plants, V. Garnier, C. Payan, Martin Lott, Nari Ranaivamonana, Jp Balayssac, E. Larose, Yuxiang Zhang, J. Saliba, A. Boniface, Z. M. Sbartai, Bogdan Piwakowski, Charles Ciccarone, Hamid Hafid, Jean Marie Henault, Florian Ouvrier Buffet Jan 2016

Non Destructive Evaluation Of Containment Walls In Nuclear Power Plants, V. Garnier, C. Payan, Martin Lott, Nari Ranaivamonana, Jp Balayssac, E. Larose, Yuxiang Zhang, J. Saliba, A. Boniface, Z. M. Sbartai, Bogdan Piwakowski, Charles Ciccarone, Hamid Hafid, Jean Marie Henault, Florian Ouvrier Buffet

Review of Progress in Quantitative Nondestructive Evaluation

Two functions are regularly tested on the containment walls in order to anticipate a possible accident. The first is mechanical to resist at a possible internal over-pressure and the second is to prevent leakage. The reference accident LLOCA (Large Loss of Coolant Accident) is the rupture of a pipe in the primary circuit of a nuclear plant. In this case, the pressure and temperature can reach 5 bar and 180°C in 20 seconds.

The national project ‘Non-destructive testing of the containment structures of nuclear plants’ aims at studying the non-destructive techniques capable to evaluate the concrete properties and its ...


A New Khz Rate Laser-Ultrasound Scanner For Ply-By-Ply Imaging Of Defects, Pores And Inconsistencies In Composite Structures, Ivan Pelivanov, Łukasz Ambrozinski, Matthew O’Donnell Jan 2016

A New Khz Rate Laser-Ultrasound Scanner For Ply-By-Ply Imaging Of Defects, Pores And Inconsistencies In Composite Structures, Ivan Pelivanov, Łukasz Ambrozinski, Matthew O’Donnell

Review of Progress in Quantitative Nondestructive Evaluation

Among NDT methods, only US and X-ray tomography can precisely locate three- dimensional defects regardless of composite type. X-ray systems, however, are very expensive, time-consuming and cumbersome. In addition, the chamber limits the size of the sample to several centimeters and makes it completely unsuitable for field applications. Conventional US pulse-echo techniques usually require couplants or full sample immersion for optimal energy transfer, which can affect overall scan speed and limit the applications where they can be used. Laser-ultrasound (LU) has many advantages over conventional US. First, laser-generated US transients are ultra-wideband, providing at least 3 times better resolution compared ...


Novel Methods To Measure Surface Wave Velocity By Using Laser-Generated Tone-Burst Surface Wave, Ju-Ho Lee, Jongbeom Kim, Kyung-Young Jhang Jan 2016

Novel Methods To Measure Surface Wave Velocity By Using Laser-Generated Tone-Burst Surface Wave, Ju-Ho Lee, Jongbeom Kim, Kyung-Young Jhang

Review of Progress in Quantitative Nondestructive Evaluation

Ultrasonic wave velocity is a characteristic of material, which is considered as a significant factor of nondestructive testing (NDT) techniques. Generally, bulk wave velocity is measured by Time-of-Flight (TOF) of pulse echo from back wall reflection; however, pulse-echo method cannot be applied to surface acoustic wave in a case that an edge does not exist in a close range. Even when we use through-transmission method, it is quite cumbersome to measure the accurate distance between transmitter and receiver; this problem is more critical when using contact angle transducers.

This study proposes two new signal processing methods to measure laser-generated surface ...


Influence Of Grain Size Distribution On Ultrasonic Scattering, Andrea Arguelles, Joseph A. Turner Jan 2016

Influence Of Grain Size Distribution On Ultrasonic Scattering, Andrea Arguelles, Joseph A. Turner

Review of Progress in Quantitative Nondestructive Evaluation

Elastic wave scattering at grain boundaries in polycrystalline media can be quantified to determine microstructural properties. The amplitude drop observed for coherent wave propagation (attenuation) as well as diffuse-field scattering events (such as the single-scattering response) have been extensively studied. In all cases, the scattering shows a clear dependence on grain size, grain geometric morphology, and material texture (i.e., macroscale anisotropy). Scattering models used to quantify such scattering experiments are often developed under the assumption of a single effective grain diameter implying a very narrow distribution of grain size throughout the sample. However, several microscopy studies suggest that most ...


Multi-Site Delamination Detection And Quantification In Composites Through Guided Wave Based Global-Local Sensing, Zhenhua Tian, Cara Leckey, Lingyu Yu Jan 2016

Multi-Site Delamination Detection And Quantification In Composites Through Guided Wave Based Global-Local Sensing, Zhenhua Tian, Cara Leckey, Lingyu Yu

Review of Progress in Quantitative Nondestructive Evaluation

Advanced composite materials are contributing to a revolution in aerospace applications. Rapid inspection techniques for detecting and quantifying damage in large composites are critical for ensuring operability and safety of composite structures. Moreover, in the development and manufacturing of next-generation composite materials, rapid inspection techniques are imperative for evaluating and certifying the materials.

This paper presents a guided wave based global-local sensing method for rapid detection and quantification of delamination damage in large composite panels. The global-local approach uses a hybrid system consisting of a piezoelectric transducer (PZT) for generating guided waves and a non-contact scanning laser Doppler vibrometer (SLDV ...


Wave Speed Propagation Measurements On Highly Attenuative Wax At Elevated Temperatures, David G. Moore, Sarah L. Stair, David A. Jack Jan 2016

Wave Speed Propagation Measurements On Highly Attenuative Wax At Elevated Temperatures, David G. Moore, Sarah L. Stair, David A. Jack

Review of Progress in Quantitative Nondestructive Evaluation

Ultrasonic stress wave amplitude and time-of-flight values change drastically as a media is heated. The measurement of relatively small variations in velocity and material attenuation can detect and quantify significant variations within a material microstructure. This paper discusses experimental setups, ultrasonic wave speed tracking methods and signal analysis algorithms that document the changes within highly attenuative wax material as it is either being heated or cooled from 25˚C to 90˚C. The experimental set-up utilizes ultrasonic probes in a pulse-echo and through-transmission configuration. The ultrasonic waveforms are recorded and analyzed during long duration thermal experiments. To complement the ultrasonic ...


Improved Scattering Models For Guided Wave Tomography, P. Huthwaite Jan 2016

Improved Scattering Models For Guided Wave Tomography, P. Huthwaite

Review of Progress in Quantitative Nondestructive Evaluation

Water collecting at pipe supports will accelerate corrosion, reducing the pipe life at a very difficult-to-inspect location. A traditional approach would require the pipe to be emptied, lifted and an ultrasonic thickness gauge be scanned across the surface. Guided wave tomography could potentially address these problems: by sending waves from an array on one side of the support through to a set of receivers on the other side, an image of the thickness can be produced, which is typically achieved by exploiting the dispersive nature of guided waves causing their speed to change depending on the thickness. However, this assumption ...


Thermal Diffusivity Measurements On Certified Standards Using Flash Ir Thermography, Vijay Nalladega, Bryon Knight Jan 2016

Thermal Diffusivity Measurements On Certified Standards Using Flash Ir Thermography, Vijay Nalladega, Bryon Knight

Review of Progress in Quantitative Nondestructive Evaluation

Infrared thermography has been increasingly used as an NDE tool for detection of defects in different types of components. At GE Global Research, the flash IR system is routinely used for inspecting for delaminations, porosity, and coating thickness and integrity. For defects such as delaminations and other larger defects, single-sided imaging, where the heat buildup due to the presence of defects can be visualized is used. However, in some cases, measurement of thermal diffusivity can also be used as an indicator of presence of damage. In this study, we report our findings on the accuracy of the diffusivity measurements using ...


Results Of The 2016 Ut Modeling Benchmark Obtained With Models Implemented In Civa, Gwénaël Toullelan, Raphaële Raillon, Steve Mahaut, Sylvain Chatillon, Sébastien Lonne Jan 2016

Results Of The 2016 Ut Modeling Benchmark Obtained With Models Implemented In Civa, Gwénaël Toullelan, Raphaële Raillon, Steve Mahaut, Sylvain Chatillon, Sébastien Lonne

Review of Progress in Quantitative Nondestructive Evaluation

For several years, the World Federation of NDE Centers, WFNDEC, proposes benchmark studies in which simulated results (in either ultrasonic, X-rays or eddy current NDT configurations) obtained with various models are compared to experiments. This year the proposed UT benchmark concerns inspection configurations with multi-skips echoes. This technique is commonly used to inspect thin specimen and/or in case of limited access inspection. This technique relies on the use of T45° mode in order to avoid mode conversion and to facilitate the interpretation of the echoes. To evaluate the influence of the beam divergence on the detectability after several skips ...


Influence Of Local Mechanical Properties Of High Strength Steel From Large Size Forged Ingot On Ultrasonic Wave Velocities, Frederic Dupont-Marillia, Mohammad Jahazi, Pierre Belanger, Serge Lafreniere Jan 2016

Influence Of Local Mechanical Properties Of High Strength Steel From Large Size Forged Ingot On Ultrasonic Wave Velocities, Frederic Dupont-Marillia, Mohammad Jahazi, Pierre Belanger, Serge Lafreniere

Review of Progress in Quantitative Nondestructive Evaluation

In the metallurgical industry, ultrasonic inspection is routinely used for the detection of defects. For the nondestructive inspection of small high strength steel parts, the material can be considered isotropic. However, when the size of the parts under inspection is large, the isotropic material hypothesis does not necessarily hold. The aim of this study is to investigate the effect of the variation in mechanical properties such as grain size, Young's modulus, Poisson’s ratio, chemical composition on longitudinal and transversal ultrasonic wave velocities. A 2 cm thick slice cut from a 40-ton bainitic steel ingot that was forged and ...


Evaluation Of The Depth Of Surface Deterioration For Concrete Structure Using Dispersion Characteristics Of Surface Wave, Chia-Chi Cheng, Ying-Tzu Ke, Keng-Tsang Hsu, Hung-Yu Tao, Chih-Hung Chiang Jan 2016

Evaluation Of The Depth Of Surface Deterioration For Concrete Structure Using Dispersion Characteristics Of Surface Wave, Chia-Chi Cheng, Ying-Tzu Ke, Keng-Tsang Hsu, Hung-Yu Tao, Chih-Hung Chiang

Review of Progress in Quantitative Nondestructive Evaluation

Surface waves generated by an impact are used to assess depth of deterioration for concrete plate. The proposed method uses one receiver positioned away from the impacting source. The spectrogram of the group velocity obtained from the signal recorded from the receiver is calculated by Short-Time Fourier Transform and the reassignment technique [1]. Experiments were conduct on the concrete plate with different thickness of mortar top layer to simulate concrete with serious aggregate segregation and bleeding. In the experiment, the source-receiver distance for concrete plate with different thickness of weak top layer are explored. Figure 1 shows the comparison between ...


Capacitive Sensing For Nuclear Power Plant Cable Insulation Assessment, Nicola Bowler, Shuaishuai Liu, Michael I. Byler, Leonard S. Fifield Jan 2016

Capacitive Sensing For Nuclear Power Plant Cable Insulation Assessment, Nicola Bowler, Shuaishuai Liu, Michael I. Byler, Leonard S. Fifield

Review of Progress in Quantitative Nondestructive Evaluation

The ability to evaluate, nondestructively, the material state of insulation polymers widely employed in aged control and power cables has been identified as important In the process of routine safety inspection and safety inspection for license renewal of aging Light Water Reactor Nuclear Power Plants (NPPs) in the United States [1]. The present industry standard is that the insulation polymer breaking strain (or elongation-at-break, EAB) should be no less than 50% of that value measured on the pristine material, for the aged insulation polymer to be fit for service. Measurement of EAB is destructive, the method requires a relatively large ...


Damage Detection Using High Order Longitudinal Guided Waves In The Anchorage Zone Of Stayed-Cable, Yongdong Pan, Feng Yang Jan 2016

Damage Detection Using High Order Longitudinal Guided Waves In The Anchorage Zone Of Stayed-Cable, Yongdong Pan, Feng Yang

Review of Progress in Quantitative Nondestructive Evaluation

High order longitudinal guided waves (HOLGW) are studied for the damage detection in the anchorage zone of stayed cable through the theoretical analysis, numerical simulation and experimental validation. First, based on the theory of elastic wave propagation in cylinder, the dispersion curves of longitudinal modes were obtained and calculated analytically and the high-frequency such as 5MHz corresponding to the higher order longitudinal guided wave modes are identified for the damage detection. Then, the ultrasonic guided waves propagating in a steel wire with or without defects were simulated by using the finite element method and the effects of defect depth and ...


Development Of Non-Destructive Methods For Detection Of Alkali Silica Reaction In Concrete Structures, Alexander Heifetz, Sasan Bakhtiari, Igor Aronson, Valerii Vinokour, Juan Lu, Anthony Bentivegna Jan 2016

Development Of Non-Destructive Methods For Detection Of Alkali Silica Reaction In Concrete Structures, Alexander Heifetz, Sasan Bakhtiari, Igor Aronson, Valerii Vinokour, Juan Lu, Anthony Bentivegna

Review of Progress in Quantitative Nondestructive Evaluation

Concrete deterioration due to damage from alkali silica reaction (ASR) is one of the most common causes of concern for aging of thick concrete structures. Damage caused by ASR gel formation and expansion typically takes 25 to 50 years to develop into visible cracks in concrete, which could undermine structural integrity. Non-destructive detection of ASR damage at early stages requires the ability to sense the presence of ASR gel, and possibly small cracks, well inside the thick concrete structure. Currently, there are no standard non-destructive testing methods for in-situ detection and monitoring of ASR. Existing assessments of ASR in concrete ...


Interaction Of Feature Guided Waves With Defects In Composite Structural Bends, X. Yu, M. Ratassepp, Z. Fan Jan 2016

Interaction Of Feature Guided Waves With Defects In Composite Structural Bends, X. Yu, M. Ratassepp, Z. Fan

Review of Progress in Quantitative Nondestructive Evaluation

Complex-shaped composite structures such as bends, stiffeners, and ribs are increasingly incorporated in aerospace applications because of their attractive mechanical properties and good moldability. However, damages like matrix cracking and delamination can be caused in these structures by stress concentration and out-of-plane impacts during the in-service use, consequently degrading the system integrity and reliability. Ultrasonic feature guided waves (FGW) can serve as promising candidates for their inspection as they can propagate along the feature long distances and potentially detect the possible defects. In this study, potential FGW modes have been identified in 90° carbon fiber/epoxy (CF/EP) quasi-isotropic bent ...


Attenuation Of Ultrasonic Waves Generated From Laser Ultrasound During Annealing Of Steel; A Comparison Between Theory And Experiment And Potential Application To Additive Manufacturing, Christopher M. Kube, Ricardo Rodriguez, Ed Habtour, Larry Holmes Jan 2016

Attenuation Of Ultrasonic Waves Generated From Laser Ultrasound During Annealing Of Steel; A Comparison Between Theory And Experiment And Potential Application To Additive Manufacturing, Christopher M. Kube, Ricardo Rodriguez, Ed Habtour, Larry Holmes

Review of Progress in Quantitative Nondestructive Evaluation

The advancement of additive manufacturing methods for the production of metallic parts has initiated the potential development of materials with tailored microstructures to enhance their material properties. To help facilitate the development, methods based on ultrasonic grain scattering are proposed to provide in-situ monitoring of the microstructure’s evolution during the build process. In this work, the longitudinal attenuation coefficient is considered, theoretically and experimentally, as a function of temperature during an annealing process of steel. Theoretically, an iterative solution to the attenuation model of Stanke and Kino is given. The theory is compared against experimental measurements of the longitudinal ...


Ultrasonic Techniques For The Detection Of Discontinuities In Aluminum Foams, Pablo Katchadjian, Alejandro García, Jose Brizuela, Jorge Camacho, Bruno Chiné, Valerio Mussi Jan 2016

Ultrasonic Techniques For The Detection Of Discontinuities In Aluminum Foams, Pablo Katchadjian, Alejandro García, Jose Brizuela, Jorge Camacho, Bruno Chiné, Valerio Mussi

Review of Progress in Quantitative Nondestructive Evaluation

Metal foams are interesting materials with many potential applications [1, 2, 3]. They are characterized by a cellular structure, that is the metals or metal alloys foamed include gas voids in the material. Their particular lightweight structure and physical, chemical and mechanical properties make them suitable for a wide range of industrial applications in different sectors. For industrial applications, metal foams offer attractive combinations of low density, high stiffness to weight ratio, good energy absorption and vibration damping capacity that cannot be obtained with other materials.

The control of the foaming process and the characterization of the metal foam are ...


Compton Imaging Tomography For Nondestructive Evaluation Of Large Multilayer Aircraft Components And Structures, Volodymyr Romanov, Victor Grubsky, Feraidoon Zahiri Jan 2016

Compton Imaging Tomography For Nondestructive Evaluation Of Large Multilayer Aircraft Components And Structures, Volodymyr Romanov, Victor Grubsky, Feraidoon Zahiri

Review of Progress in Quantitative Nondestructive Evaluation

Novel nondestructive evaluation (NDE) systems based on a recently pioneered Compton Imaging Tomography (CIT) technique [1-4 are currently being developed by Physical Optics Corporation (POC). CIT provides high-resolution, three-dimensional (3D), Compton scattered X-ray imaging of the internal structure of evaluated objects, using a set of acquired two-dimensional Compton scattered X-ray images of consecutive cross sections of these objects. Unlike conventional computerized tomography, CIT requires only one-sided access to objects, has no limitation on the dimensions and geometry of such objects, and can be applied to large, multilayer, nonuniform objects. Also, CIT does not require any contact with objects during its ...


Distributed Temperature Sensing Using A Spiral Configuration Ultrasonicwaveguide, Suresh Periyannan, Krishnan Balasubramaniam Jan 2016

Distributed Temperature Sensing Using A Spiral Configuration Ultrasonicwaveguide, Suresh Periyannan, Krishnan Balasubramaniam

Review of Progress in Quantitative Nondestructive Evaluation

Distributed temperature sensing has important applications in the long term monitoring of critical enclosures such as containment vessels, flue gas stacks, furnaces, underground storage tanks and buildings for fire risk. This paper presents novel techniques for such measurements, using wire in a spiral configuration and having special embodiments such a notch for obtaining wave reflections from desired locations. Transduction is performed using commercially available Piezo-electric crystal that is bonded to one end of the waveguide. Lower order axisymmetric guided ultrasonic modes were employed. Time of fight (TOF) differences between predefined reflectors located on the waveguides are used to infer temperature ...


Gradient Enhanced Surrogate Modeling Methods For Nde Applications, Matthew R. Cherry, John C. Aldrin Jan 2016

Gradient Enhanced Surrogate Modeling Methods For Nde Applications, Matthew R. Cherry, John C. Aldrin

Review of Progress in Quantitative Nondestructive Evaluation

Over the past 15 years, there has been significant interest in the NDE community in surrogate modeling applied to both uncertainty propagation (UP) as well as inverse uncertainty quantification (UQ). There has been a general acceptance in the value of surrogates due to the quick model evaluations that can be made during an inverse problem or for fast Monte Carlo sampling, evidenced by the fact that surrogate modeling techniques now appear in multiple commercial NDE simulation tools. Many techniques have been explored such as regular grid methods, polynomial chaos, sparse grids, response surfaces, and Kriging models, among others. While these ...


Use Of Guided Wave Inspections To Monitor The Integrity Of Nuclear Power Station Boilers, P. Jackson, P. J. Mudge, K. J. Thornicroft, A. G. Haig, R. Sanderson, E. Hutchison, C. R. A. Scheider Jan 2016

Use Of Guided Wave Inspections To Monitor The Integrity Of Nuclear Power Station Boilers, P. Jackson, P. J. Mudge, K. J. Thornicroft, A. G. Haig, R. Sanderson, E. Hutchison, C. R. A. Scheider

Review of Progress in Quantitative Nondestructive Evaluation

This paper describes a ground-breaking application of guided wave testing for the nuclear power industry. Hartlepool and Heysham 1 power stations in the UK contain boilers of a unique ‘pod’ design in which the spiral boiler tubes are supported from above by a central vertical ‘spine’, which is a tubular component approximately 520mm in diameter and 21m long with complex changes in cross-section and attachments along its length. There are 32 boilers in the two stations. The gas which has passed through the reactor core flows down over the boiler tubes, heating the water inside. Only the top 2m of ...


High-Frequency Total-Focusing Method Imaging In Strongly Attenuating Materials With The Decomposition Of The Time Reversal Operator Associated With Orthogonal Coded Excitations, Eduardo Lopez Villaverde, Sébastien Robert, Claire Prada Jan 2016

High-Frequency Total-Focusing Method Imaging In Strongly Attenuating Materials With The Decomposition Of The Time Reversal Operator Associated With Orthogonal Coded Excitations, Eduardo Lopez Villaverde, Sébastien Robert, Claire Prada

Review of Progress in Quantitative Nondestructive Evaluation

This communication presents a study that aims to improve the ultrasonic array imaging in High Density Polyethylene (HDPE). This material has been used in place of steel alloys in the power, petrochemical and mining industries because of its notable resistance to corrosion. The HDPE is also desirable to be used in nuclear power stations. Compared to metallic welds, the HDPE fusion welds can be considered as homogeneous and isotropic, but the high viscoelastic attenuation of the material makes the weld inspection very difficult. At high frequencies, pulse-echo images present a dramatic electronic noise introduced by the signal acquisition system.

In ...


All Optical Pump Probe Setup For Austenitic And Casted Steel Study, Damien Gasteau, Nikolay Chigarev, Lili Ducousso-Ganjehi, Vincent Tournat, Vitali Gusev Jan 2016

All Optical Pump Probe Setup For Austenitic And Casted Steel Study, Damien Gasteau, Nikolay Chigarev, Lili Ducousso-Ganjehi, Vincent Tournat, Vitali Gusev

Review of Progress in Quantitative Nondestructive Evaluation

Polycrystalline materials are the most natural form of metals and are commonly used in industry. In particular, steels such as austenitic steels and casted steels are widely used for their specific properties in fatigue and resistance to heat in particular for application such as water pipes for cooling system in nuclear technologies. Usually studied by an effective approach, the characterization of the composing grains remains an essential aspect of their global physical behavior.

A sub nanosecond pump probe laser setup is used to generate and detect acoustic waves in a sample in order to explicit the anisotropy and morphology by ...


Differential Wavefield Velocity Imaging For Damage Visualization, Chia Chen Ciang Jan 2016

Differential Wavefield Velocity Imaging For Damage Visualization, Chia Chen Ciang

Review of Progress in Quantitative Nondestructive Evaluation

Ultrasonic propagation imaging or wavefield imaging has been widely used to evaluate structural damages and internal features. Inspecting complete wavefield time history for damage identification is tedious and error-prone. A more effective way is by extracting damage-related information into a single image. Various strategies were previously proposed but their effectiveness is generally dependent on exhaustive supervised learning. A differential wavefield velocity imaging method that maps the local deviation of group or phase velocity in a structure is proposed. It could be used in combination with any ultrasonic wavefield measurement system that acquires full wavefield time history over a two-dimensional rectilinear ...


Inspection Of Coatings Using Terahertz Time Domain Spectroscopy System, Tomasz Chady, Krzysztof Gorący Jan 2016

Inspection Of Coatings Using Terahertz Time Domain Spectroscopy System, Tomasz Chady, Krzysztof Gorący

Review of Progress in Quantitative Nondestructive Evaluation

Coatings and paints are use in almost all branches of modern industry. Mostly as a material for corrosion protection. It is understandable that failure of coating is critical for ability and time of protection.

Failure can occur for many reasons

– improper selection of coating material for given substrate

– lack of compatibility or chemical reactions,

– bad adhesion (blistering, flaking, peeling),

– strong exterior action as chemical exposure, abrasion, weathering,

– poor or inadequate surface preparation or improper application as surface,

– contamination, too low surface profile, pinholes, overspray, improper drying, lack of cure,

– incompetent design of structure

– sharp edges, skip welds.

Modern paints, especially ...


Novel Wavelet Threshold Denoising Method In Axle Press-Fit Zone Ultrasonic Detection, Chaoyong Peng, Xiaorong Gao, Jianping Peng, Ai Wang Jan 2016

Novel Wavelet Threshold Denoising Method In Axle Press-Fit Zone Ultrasonic Detection, Chaoyong Peng, Xiaorong Gao, Jianping Peng, Ai Wang

Review of Progress in Quantitative Nondestructive Evaluation

Axles are important part of railway locomotives and vehicles. Periodic ultrasonic inspection of axles can effectively detect and monitor axle fatigue cracks. However, in the axle press-fit zone, the complex interface contact condition reduces the signal-noise ratio (SNR). Therefore, the probability of false positives and false negatives increases. In this work, a novel wavelet threshold function is created to remove noise and suppress press-fit interface echoes in axle ultrasonic defect detection. The exponential threshold function proposed by Andria [1] can't get a gradual curve for later optimum searching process; and the novel wavelet threshold function with two variables is ...


Guided Waves For Online Inspection Of Composites, Harsh Shah, Prabhu Rajagopal, Krishnan Balasubramaniam Jan 2016

Guided Waves For Online Inspection Of Composites, Harsh Shah, Prabhu Rajagopal, Krishnan Balasubramaniam

Review of Progress in Quantitative Nondestructive Evaluation

Ultrasonic guided waves are attractive for long-range inspection of large-scale structures. However surface based transducers that are typically used, lead to two-dimensional wave propagation, limiting the applicability of guided wave methods. This work explores the use of embedded waveguides for monitoring delamination type defects in composites. Finite Element simulations validated by the experiments are used to study the interaction of leaky guided waves into defective regions. Results show that the approach is promising for long-range monitoring of interior composite volume.


Models For Ut Inspection Of Bolthole Cracks In Layered Structures, Robert Grandin, Tim Gray, Ron Roberts Jan 2016

Models For Ut Inspection Of Bolthole Cracks In Layered Structures, Robert Grandin, Tim Gray, Ron Roberts

Review of Progress in Quantitative Nondestructive Evaluation

Due to the geometrical complexities of bolted, layered airframe structures, the application of Model Assisted Probability of Detection, or MAPOD, is an important tool for helping to assess the ultrasonic inspectability of those components. Of particular importance is the need to inspect for cracks on or near boltholes in those structures. This presentation describes the development and testing of analytical computer models of and their application to bolthole crack inspection. The modeling approach includes approximate, paraxial, bulk-wave models as well as more rigorous, analytical models that include both bulk and surface/plate modes. The simpler models have the flexibility and ...


Development Of An Electromagnetic Imaging System For Well Bore Integrity Inspection, Y. A. Plotnikov, F. W. Wheeler, S. Mandal, W. R. Ross, J. S. Price, E. J. Nieters, A. Ivan, S. Dolinsky, H. C. Climent, A. M. Kasten Jan 2016

Development Of An Electromagnetic Imaging System For Well Bore Integrity Inspection, Y. A. Plotnikov, F. W. Wheeler, S. Mandal, W. R. Ross, J. S. Price, E. J. Nieters, A. Ivan, S. Dolinsky, H. C. Climent, A. M. Kasten

Review of Progress in Quantitative Nondestructive Evaluation

State-of-the-art imaging technologies for monitoring the integrity of oil and gas well bores are typically limited to inspection of metal casings and cement bond interfaces close to the first casing region. The objective of this study is to develop a novel well-integrity inspection system that is capable of providing enhanced information about the flaw structure and topology of hydrocarbon producing well bores. In order to achieve this, we propose the development of a multi-element electromagnetic (EM) inspection tool that can provide information about material loss in the first and second casing structure as well as information about eccentricity between multiple ...


Angle-Beam Shear Wave Scattering From Buried Crack-Like Defects In Bonded Specimens, Carson T. Maki, Jennifer E. Michaels, Yu Weng, Thomas E. Michaels Jan 2016

Angle-Beam Shear Wave Scattering From Buried Crack-Like Defects In Bonded Specimens, Carson T. Maki, Jennifer E. Michaels, Yu Weng, Thomas E. Michaels

Review of Progress in Quantitative Nondestructive Evaluation

Ultrasonic wavefield imaging, which refers to the measurement of wave motion on a 2-D rectilinear grid resulting from a fixed source, has been previously applied to angle-beam shear wave propagation in simple plates with through-holes and far-surface notches [1]. In this prior work scattered waves were analyzed using baseline subtraction of wavefields acquired before and after a notch was introduced [2]. In practice, however, defects of interest often occur between bonded layers and it is generally not possible to record data from the same specimen in both the undamaged and damaged states, making direct baseline subtraction infeasible. This present work ...