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A novel application of ultrasonic Lamb waves: studying adhesive effects on the inspection of coating debonding in a three-layer waveguide Nondestruct. Testing Eval. (IF 1.424) Pub Date : 2020-12-29 Mohammad Mehrabi; Mohammad Hossein Soorgee; Hossein Habibi; Vassilios Kappatos
ABSTRACT In this research, a thorough experimental and numerical study is conducted to investigate a novel application of the ultrasonic Lamb waves which is its capability to detect the coating disbond in a double-layer waveguide (aluminium-adhesive) and a triple-layer waveguide (aluminium-adhesive-coating). The experimental tests are set up and implemented to evaluate how the attenuation of Lamb waves
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Crack identification in beam-type structural elements using a piezoelectric sensor. Nondestruct. Testing Eval. (IF 1.424) Pub Date : 2020-11-09 Goutam Roy; Brajesh Panigrahi; G. Pohit
ABSTRACT A crack or any kind of damage induces a sharp discontinuity in the rotational displacement curve in a structure under load. However, if the beam is not loaded sufficiently or crack depth is very small, the discontinuity may not be possible to identify through conventional methods. This study proposes a non-destructive approach to reveal the presence of a crack in structural components based
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Interaction of circumferential SH0 guided wave with circumferential cracks in pipelines Nondestruct. Testing Eval. (IF 1.424) Pub Date : 2020-11-06 Wenze Shi; Weiwei Chen; Chao Lu; Yao Chen
ABSTRACT This paper aims to provide a method for detecting the circumferential crack by analysing the two reflected SH0 guided wave from the front-edge and back-edge of the circumferential crack. We established a finite element model for the propagation of SH0 guided waves in the pipe, and the waves were generated by a periodic-permanent-magnet electromagnetic acoustic transducer (PPM EMAT). The influences
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Integrating non-destructive testing data to produce asphalt pavement critical strains Nondestruct. Testing Eval. (IF 1.424) Pub Date : 2020-10-27 Christina Plati; Konstantinos Gkyrtis; Andreas Loizos
ABSTRACT Knowledge of critical strains during the asphalt pavements’ life is an inherent process within pavement structural assessment. Highway agencies need this knowledge to effectively manage potential maintenance activities. Conventional practice includes mechanistic analysis of data collected in-situ. Contrariwise, developing models or algorithms for strain prediction bypasses the time-consuming
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Effect of patch hybridisation on indentation resistance and residual performance of patch repaired glass/epoxy laminates using acoustic emission monitoring Nondestruct. Testing Eval. (IF 1.424) Pub Date : 2020-10-16 K. Shruthi; K. Saravanakumar; V. Arumugam; C. Suresh Kumar
ABSTRACT This research work focuses on investigating the effect of external patch repair and its sequence on quasi-static indentation (QSI) response of glass/epoxy laminates. The parent woven glass/epoxy laminates (Type-I) was repaired by using woven (W) and chopped (C) fibres with different patch sequence such as W/W/W/W (Type II), W/C/C/W (Type III), C/W/W/C (Type IV) and C/C/C/C (Type V). The aim
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Nondestructive analysis of debonding in composite/rubber/rubber structure using ultrasonic pulse-echo method Nondestruct. Testing Eval. (IF 1.424) Pub Date : 2020-09-29 Shanpu Zheng; Sai Zhang; Ying Luo; Baiqiang Xu; Wenfeng Hao
ABSTRACT Detecting the debonding defects in the composite/rubber/rubber bonding structure is very difficult because of the high attenuation and aliasing of the ultrasonic wave from the structure. In order to solve this problem, a detection system was built based on the high-power ultrasonic pulse-echo method, and the time-frequency contour image of the wavelet coefficient modulus of the echo using
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Case depth evaluation of induction-hardened camshaft by using magnetic Barkhausen noise (MBN) method Nondestruct. Testing Eval. (IF 1.424) Pub Date : 2020-09-28 P.L. Tam; P. Hammersberg; G. Persson; J. Olavison
ABSTRACT Magnetic Barkhausen noise (MBN) method is one of the non-destructive evaluating (NDE) techniques used in industry to monitor the quality of ferromagnetic products during manufacture. In this article, case depth evaluation of the camshaft lobes by this means after induction hardening is described. A routine industrial monitoring practice is found to have limitation to evaluate the thickness
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Preface special issue: industrial computed tomography – 10th conference on industrial computed tomography Nondestruct. Testing Eval. (IF 1.424) Pub Date : 2020-09-24 Johann Kastner; Sascha Senck
(2020). Preface special issue: industrial computed tomography – 10th conference on industrial computed tomography. Nondestructive Testing and Evaluation: Vol. 35, iCT2020 Special Issue: NTE, pp. 239-240.
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Automated defect detection for fast evaluation of real inline CT scans Nondestruct. Testing Eval. (IF 1.424) Pub Date : 2020-09-13 Maxim Schlotterbeck; Lukas Schulte; Weaam Alkhaldi; Martin Krenkel; Eno Toeppe; Stephan Tschechne; Christian Wojek
In this paper, we present a fully automatic evaluation approach that can be used for fast inline CT scanning. In contrast to classical defect-recognition algorithms, this approach does not require good image quality. Instead, it allows to distinguish CT artifacts from real defects introduced in the production process. To this end, a three-step workflow was developed, in which any deviations from a
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Investigation of the roughness variation along the length of LPBF manufactured straight channels Nondestruct. Testing Eval. (IF 1.424) Pub Date : 2020-08-14 Christopher G. Klingaa; Thomas Dahmen; Sina Baier-Stegmaier; Sankhya Mohanty; Jesper H. Hattel
Conformal cooling channels, made by the laser powder bed fusion process, are a promising design strategy for optimising cooling and process control of manufacturing tools and injections moulds. The addition of internal features such as corrugations and ribs are becoming an interesting addition to the cooling channel designs. Internal surfaces of laser powder bed fusion components have an inherent process-induced
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Analytical model for rectangular side-by-side probe in eddy-current non-destructive inspection Nondestruct. Testing Eval. (IF 1.424) Pub Date : 2020-09-17 Wu Dehui; Wenxiong Chen; Jiaxin Yang; Fan Yang
A side-by-side probe is typically used in eddy-current testing as it offers advantages such as good sensitivity and high signal-to-noise ratio. However, most studies regarding side-by-side probes are primarily based on circular coils. In this study, an analytical model of a rectangular side-by-side probe is developed, in which transmitter and receiver coils are rectangular and assembled side-by-side
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Urban hazardous chemicals pipeline leakage positioning method based on CELMD-MCKD Nondestruct. Testing Eval. (IF 1.424) Pub Date : 2020-08-10 Yongmei Hao; Zhanghao Du; Zhixiang Xing; Juncheng Jiang; Ke Yang; Lei Ni; Xinming Yan
Aiming at the difficulty of leak detection of urban hazardous chemical pipelines, this paper proposes a method for locating pipeline leaks based on the complementary ensemble local mean decomposition (CELMD) and maximum correlation kurtosis deconvolution (MCKD) secondary noise reduction. First, white noise with opposite sign was added to the original leak signal in pairs, and the noisy signal was decomposed
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A parameter optimized variational mode decomposition method for rail crack detection based on acoustic emission technique Nondestruct. Testing Eval. (IF 1.424) Pub Date : 2020-07-13 Xin Zhang; Tiantian Sun; Yan Wang; Kangwei Wang; Yi Shen
An important issue in analysing signals by the variational mode decomposition (VMD) algorithm is to confirm the number of modes and the balance parameter. In the applications of fault detection, most studies optimise parameters by the characteristics to extract fault information perfectly. Then, the results are used for subsequent operations such as fault analysis and classification. However, the optimal
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Analysis and comparison of algorithms for the tomographic reconstruction of curved fibres Nondestruct. Testing Eval. (IF 1.424) Pub Date : 2020-06-29 Bernhard Fröhler; Tim Elberfeld; Torsten Möller; Hans-Christian Hege; Jan De Beenhouwer; Jan Sijbers; Johann Kastner; Christoph Heinzl
We present visual methods for the analysis and comparison of the results of curved fibre reconstruction algorithms, i.e., of algorithms extracting characteristics of curved fibres from X-ray computed tomography scans. In this work, we extend previous methods for the analysis and comparison of results of different fibre reconstruction algorithms or parametrisations to the analysis of curved fibres.
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Techniques for high-fidelity X-ray micro-tomography of additively manufactured metal components Nondestruct. Testing Eval. (IF 1.424) Pub Date : 2020-06-24 A.M. Kingston; Q. Yang; M.G. Grewar; O. Delgado-Friedrichs; G.R. Myers; S.J. Latham; A.P. Sheppard
Additive manufacturing is revolutionising the production of complex-shaped components and finding widespread application in the industries where production volumes are low and part geometries are complex. High-fidelity 3D imaging of additively manufactured metal parts, as the most effective nondestructive evaluation method, is crucial to maintaining the quality of safety-critical components during
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A low-cost geometry calibration procedure for a modular cone-beam X-ray CT system Nondestruct. Testing Eval. (IF 1.424) Pub Date : 2020-06-24 V. Nguyen; J. De Beenhouwer; J. G. Sanctorum; S. Van Wassenbergh; S. Bazrafkan; J. J. J. Dirckx; J. Sijbers
Accurate knowledge of the acquisition geometry of a CT scanning system is key for high quality tomographic imaging. Unfortunately, in modular X-ray CT setups, geometry misalignment occurs each time the setup is changed, which calls for an efficient calibration procedure to correct for geometric inaccuracies. Although many studies have been dealing with the calibration of X-ray CT systems, these are
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Investigation of the impact of various robot properties on a twin Robot-CT system Nondestruct. Testing Eval. (IF 1.424) Pub Date : 2020-06-24 Risheng Kang; Gabriel M. Probst; Peter Slaets; Wim Dewulf
Robot-CT is drawing great attention for its potential to support highly flexible scan trajectories and various scan modes with a single system. However, the quality of CT reconstruction largely depends on accurate knowledge of the scan geometry, i.e. position and orientation of the source and the detector. This imposes major challenges on current serial industrial robots. In order to realistically
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Scanning trajectory optimisation using a quantitative Tuybased local quality estimation for robot-based X-ray computed tomography Nondestruct. Testing Eval. (IF 1.424) Pub Date : 2020-06-21 Gabriel Herl; Jochen Hiller; Andreas Maier
Robotic CT systems allow complex scanning trajectories. This work presents a workflow to automatically calculate optimised scanning trajectories for robotic CT systems. In particular, as a local quality estimation, this work introduces a quantitative measure to quantify local reconstruction quality based on the Tuy conditions. The proposed method is tested in two summation experiments using an STL
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Additive manufacturing and non-destructive testing of topology-optimised aluminium components Nondestruct. Testing Eval. (IF 1.424) Pub Date : 2020-06-15 Sascha Senck; Michael Happl; Michael Reiter; Michael Scheerer; Manuel Kendel; Jonathan Glinz; Johann Kastner
Additive manufacturing (AM) unlocks novel industrial possibilities in relation to design optimisation for lightweight structures, e.g. in aerospace applications. However, the inherent geometric complexity of topology-optimised AM components represents a major challenge for conventional non-destructive testing (NDT) methods. Due to its flexibility and high throughput, industrial X-ray micro-computed
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Mesostructural simulation of discontinuous prepreg platelet based carbon fibre sheet moulding compounds informed by X-ray computed tomography Nondestruct. Testing Eval. (IF 1.424) Pub Date : 2020-06-07 P. S. Stelzer; B. Plank; Z. Major
Discontinuous prepreg platelet based carbon fibre sheet moulding compound (CF-SMC) materials offer huge potential for lightweight applications in the automotive industry. The composition of these materials and the flow behaviour during compression moulding result in a complex stochastic mesostructure, which presents a challenge in the modelling of the mechanical behaviour. The objective of the current
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Predicting hardness profile of steel specimens subjected to Jominy test using an artificial neural network and electromagnetic nondestructive techniques Nondestruct. Testing Eval. (IF 1.424) Pub Date : 2020-06-04 Iman Ahadi Akhlaghi; Saeed Kahrobaee; Amir Akbarzadeh; Mehrdad Kashefi; Thomas W. Krause
Based on relationships between electromagnetic properties and microstructural changes in steel, the current paper describes the development of an electromagnetic technique to determine steel hardenability, non-destructively. Performing Jominy end-quench test, magnetic hysteresis loop and eddy current methods have been applied to SAE 4140 standard steel samples to explore applicability of the non-destructive
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Efficiency of NDT techniques to detect voids in grouted post-tensioned concrete ducts Nondestruct. Testing Eval. (IF 1.424) Pub Date : 2020-05-18 Sahil Garg; Sudhir Misra
Variations in the design requirements of prestressed concrete girders lead to variations in their geometry and section profile, thereby influencing the characteristics of the waves which form the working principles of the various NDT techniques, and thus possibly shield the presence of air void. Thus, an experimental plan was adopted to study the effect of the changes in parameters like the cover to
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Bayesian dynamic modification of corrosion in a cylindrical rod quantified by guided waves technique Nondestruct. Testing Eval. (IF 1.424) Pub Date : 2020-05-18 Yaoye Zhang; Dongsheng Li; Zhi Zhou
In this study, both estimation and modification strategies of measurement uncertainty were investigated when using a guided waves (GWs) technique to quantify the corrosion level of a cylindrical rod induced by an accelerated setup, thus providing essential and reliable information for making decisions regarding necessary remedial work. First, the remnant diameters under corrosion were quantified based
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The in-situ evaluation of surface-breaking cracks in asphalt using a wave decomposition method Nondestruct. Testing Eval. (IF 1.424) Pub Date : 2020-05-18 M Iodice; J M Muggleton; E Rustighi
Damage in a pavement structure is usually initiated in the asphalt layers, making the Rayleigh wave ideally suited to the detection of shallow surface defects. However, the practical application of crack detection methods in asphalt is hampered by the dispersive behaviour of the road pavement. A new digital signal processing technique for the measurement of the amplitude and phase of the direct and
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Employing a U-net convolutional neural network for segmenting impact damages in optical lock-in thermography images of CFRP plates Nondestruct. Testing Eval. (IF 1.424) Pub Date : 2020-05-15 B. C. F. Oliveira; A. A. Seibert; V. K. Borges; A. Albertazzi; R. H. Schmitt
Carbon fibre reinforced plastics (CFRPs) are replacing metals in fields such as aerospace due to their high mechanical strength and low weight. They have an anisotropic behaviour, which hinders the analysis of structural impairment caused by damages like impacts. Optical lock-in thermography (OLT) can be used to assess CFRP integrity and image processing tools can be applied to measure the area affected
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Identification of defect size in ferromagnetic steels based on the piezomagnetic field measurement Nondestruct. Testing Eval. (IF 1.424) Pub Date : 2020-04-29 Sheng Bao; Qiang Luo; Yibin Gu; Zhengye Zhao
The goal of this research is to investigate the correlation between the piezomagnetic field and the defect size in ferromagnetic steels. Specimens of 30Cr steels were machined into standard bars with circular holes of different sizes in the centre. Tensile tests were carried out to measure the piezomagnetic field on the surface of the defective specimens. The variations of the piezomagnetic parameters
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Prediction of RCF clustered cracks dimensions using an ACFM sensor and influence of crack length and vertical angle Nondestruct. Testing Eval. (IF 1.424) Pub Date : 2019-05-09 J. Shen; L. Zhou; H. Rowshandel; G.L. Nicholson; C.L. Davis
Rolling contact fatigue (RCF) cracks are the predominant reason for rail grinding maintenance and replacement on all types of railway system, as they can potentially cause rail break if not removed. To avoid excessive material removal, accurate crack sizing is required. Alternating current field measurement has been used as an electromagnetic method for RCF crack sizing, incorporating with modelling
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Fictitious electric conductivity modelling of eddy current evaluation of magnetic materials Nondestruct. Testing Eval. (IF 1.424) Pub Date : 2019-07-01 Tarik Bouchala; Anouaressadate Aouf; Bachir Abdelhadi; Azeddine Benoudjit
This paper presents a new modeling approach of eddy current nondestructive evaluation systems containing magnetic materials. Originally, the proposed model is based on coupled circuits principle and the notion of equivalent current density. In order to make the model homogenous, we consider the current density as a state variable since this density is compatible with the representation of the magnetisation
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Combination of non-destructive tests for assessing decay in existing timber elements Nondestruct. Testing Eval. (IF 1.424) Pub Date : 2019-07-01 Taoyi Yu; Hélder S. Sousa; Jorge M. Branco
Existing timber structures often present elements with different levels of decay and the choice to maintain them comes from the structural assessment, made by a civil engineer on the basis of the results coming from the on-site survey. The choice may also rely on visual inspection combined non-destructive tests. In that case, the choice to maintain an element will greatly depend on the accuracy and
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Condition monitoring with defect localisation in a two-dimensional structure based on linear discriminant and nearest neighbour classification of strain features Nondestruct. Testing Eval. (IF 1.424) Pub Date : 2019-07-09 R. Janeliukstis; S. Rucevskis; A. Chate
A method for condition monitoring and localization of defects in mass-produced structural members using supervised learning is presented. An example for the effectiveness of the developed method comprises cantilevered carbon composite plate. In a numerical finite element model, the plate is partitioned into zones and a point mass is put on several locations within each zone. Point mass is treated as
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Research on the contact fatigue failure of thermal sprayed coating based on infrared thermography Nondestruct. Testing Eval. (IF 1.424) Pub Date : 2019-10-22 Runbo Ma; Lihong Dong; Haidou Wang; Wei Guo
Aiming to improve the accuracy of the contact life prediction of sprayed coatings, a series of contact fatigue tests are conducted on RM-1 tester. Five kinds of plasma sprayed Al2O3–40 wt%TiO2 composite ceramic coatings (AT40 ceramic coatings) of different quality and surface performance parameters are tested on the principle of central composite design. The passive infrared thermography is used to
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Topological neural network of combined AE and EN signals for assessment of SCC damage Nondestruct. Testing Eval. (IF 1.424) Pub Date : 2019-08-12 Luigi Calabrese; Massimiliano Galeano; Edoardo Proverbio; Domenico Di Pietro; Angelo Donato
Stress corrosion cracking (SCC) is a common corrosion form that involves undetected premature failures during service life of structures. Since SCC is a combination of electrochemical and mechanical phenomena, coupled acoustic emission and electrochemical noise techniques were proposed to investigate the evolution of SCC damage tomartensitic stainless steel samples. Tests were carried out using a precipitation
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An accurate non-destructive method for determining mechanical properties of plain carbon steel parts using MHL and GRNN Nondestruct. Testing Eval. (IF 1.424) Pub Date : 2020-03-19 Iman Ahadi Akhlaghi; Saeed Kahrobaee; Kian Karami Nezhad
The sensitivity of magnetic non-destructive methods to both chemical composition and microstructure has limited their potential application for determination of mechanical properties in plain carbon steels under conditions of varying carbon content and microstructure. The present paper investigates advantages of applying an artificial neural network (ANN) method to magnetic hysteresis loop (MHL) method
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Detection of defects in a welded joint by scanning contact potentiometry Nondestruct. Testing Eval. (IF 1.424) Pub Date : 2020-03-19 A. I. Alwaheba; V. I. Surin; T. E. Ivanova; O. V. Ivanov; V. G. Beketov; V. А. Goshkoderov
Scanning contact potentiometry (SCP) is a nondestructive method used for defects detection, and for determining the location coordinates of defects in welded joints. This paper evaluates the accuracy of SCP method in detecting defects and localising them in welded steel plates. The effectiveness of the SCP method was evaluated using sample of steel 321 H plates (Chromium–Nickel–titanium stainless steel)
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A study on diagnosing both isotropic and orthotropic, intentionally damaged laminates Nondestruct. Testing Eval. (IF 1.424) Pub Date : 2020-03-17 Khadijeh Askaripour; Arkadiusz Żak
Being the most detrimental mode in laminated structures, delamination initially degrades local structural strength, and lastly causes global structural failure, thus necessitating delamination identification at its incipient stages. For identification purposes, a comprehensive numerical and experimental study on delamination within both the laminated isotropic acrylic-glass and orthotropic epoxy-glass
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Evaluation of condition of low-carbon steels experiencing plastic deformation using the effect of acoustic birefringence Nondestruct. Testing Eval. (IF 1.424) Pub Date : 2020-02-20 V. V. Mishakin; A. V. Gonchar; S. V. Kirikov; V. A. Klyushnikov
The influence of plastic deformation of low-carbon steel on birefringence of the shear waves birefringence is examined. Acoustic measurements show that the birefringence changes monotonously, while the intensity of the change decreases with increasing strain. Significant reduction of the birefringence is found to indicate that the capability to plastic deformation has been largely used. In order to
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Condition assessment tool for timber utility poles using stress wave propagation technique Nondestruct. Testing Eval. (IF 1.424) Pub Date : 2020-02-16 B. Sriskantharajah; E. Gad; S. Bandara; P. Rajeev; I. Flatley
Timber utility poles are significantly used in power and telecommunication infrastructures all over the world. The deterioration of timber with time is common due to various factors including termite attacks and climatic conditions. Failure of poles can have serious safety concerns and economic implications. Hence, the condition assessment of timber poles is important for safe and economical operation
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Magnetic anomaly characteristics of surface crack defects in a titanium alloy plate Nondestruct. Testing Eval. (IF 1.424) Pub Date : 2020-02-04 Bo Hu; Yi Liu; Runqiao Yu
A finite element simulation analysis of micromagnetic signals of surface crack defects on a titanium (Ti) alloy plate was performed, and a verification experiment was designed. Simulation results showed that micromagnetic detection exhibited strong detection capability when used for crack defects with 0.15–0.6 mm widths. Good detection capability could be ensured if the detection lift-off height was
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Analytical modelling and simulations for high-frequency eddy current testing with planar spiral coils Nondestruct. Testing Eval. (IF 1.424) Pub Date : 2020-01-21 Binghua Cao; Xiaohan Li; Mengyun Wang; Mengbao Fan
An analytical model of eddy current field under sinusoidal excitation of a planar spiral coil is established, taking into account the gap between the turns of a spiral coil and displacement current. The developed model is firstly validated by FEM and experiments, and then was applied to investigate the influences of displacement current on eddy current signal. The results show that the increase of
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Strain - deformation reconstruction of CFRP laminates based on Ko displacement theory Nondestruct. Testing Eval. (IF 1.424) Pub Date : 2020-01-07 Guoping Ding; Shengyuan Yue; Songchao Zhang; Wenhao Song
The deformation of Carbon Fibre Reinforced Polymer (hereafter referred to as CFRP) will affect the reliability and safety of products when it is applied in the fields of aeronautics & astronautics and military, and it can provide a basis for assessing the safety performance of structures by monitoring the deformation of CFRP laminates real time. In this paper, the CFRP laminates are taken as the research
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Shape prior metal artefact reduction algorithm for industrial 3D cone beam CT Nondestruct. Testing Eval. (IF 1.424) Pub Date : 2020-01-03 Soomin Jeon; Seongeun Kim; Chang-Ock Lee
Metal artefact reduction has become a challenging issue for practical X-ray CT applications since metal artefacts severely cause contrast degradation and the misinterpretation of information about the property and structure of a scanned object. In this paper, we propose a methodology to reduce metal artefacts in a three-dimensional industrial cone beam CT system. We develop a registration technique
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Effect of thickness on indentation response and tensile loading behaviour of glass/epoxy laminates under acoustic emission monitoring Nondestruct. Testing Eval. (IF 1.424) Pub Date : 2020-01-03 Saravanakumar Kannivel; Arumugam Vellayaraj; Ismailzabeeullah Kolimi; Janietha Thomas
This research work investigates the effect of thickness on the quasi-static indentation and tensile loading behaviour of glass/epoxy laminates. Cross-ply [0°/90°]3S laminates fabricated at different process pressures (40 kg/cm2, 50 kg/cm2 and 60 kg/cm2) were subjected to quasi-static indentation loading. Furthermore, the residual load-bearing capacity was estimated by performing tensile after indentation
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Comparison between air-coupled ultrasonic testing and active thermography for defect identification in composite materials Nondestruct. Testing Eval. (IF 1.424) Pub Date : 2019-12-09 A. Quattrocchi; F. Freni; R. Montanini
ABSTRACT Glass or carbon fibre-reinforced polymer (FRP) structures have attained a relevant role in modern production thanks to their lightweight, high resistance to corrosion and fatigue, and relative ease of manufacturing complex shapes. Nevertheless, several types of defects, such as voids, matrix fractures, delaminations and impact damages, which might significantly reduce the useful life of composite-made
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Quantitative evaluation of stress corrosion cracking based on crack conductivity model and intelligent algorithm from eddy current testing signals Nondestruct. Testing Eval. (IF 1.424) Pub Date : 2019-12-09 Li Wang; Wenlu Cai; Zhenmao Chen
ABSTRACT Quantitative evaluation of stress corrosion cracking (SCC) using eddy current testing (ECT) signals often underestimates the depth of crack due to the complex geometry and conductivity characteristics of crack. It can be approximately regarded as a multi-variable nonlinear optimisation problem considering the cross-sectional feature and conductivity distribution of crack. For the multi-variable
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A statistical approach for evaluating crack defects in structures under dynamic responses Nondestruct. Testing Eval. (IF 1.424) Pub Date : 2019-12-06 Thanh Q. Nguyen; Lam Q. Tran; H. Nguyen-Xuan; Nhi K. Ngo
This article presents a new approach to processing data in identifying and evaluating defects of structures with deformation measurement signals. By using sensitive characteristics observed in the old statistical parameters such as mean values, variances, and standard deviations, we propose three new parameters including kurtosis, skewness of signals, and statistical density function. In addition,
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Combined usage of acoustic emission technique and ultrasonic pulse velocity test to study crack classification in reinforced concrete structures Nondestruct. Testing Eval. (IF 1.424) Pub Date : 2019-11-27 R. Vidya Sagar; Madhurima Dutta
ABSTRACT This article aims to improve the knowledge on ‘crack classification’ in reinforced concrete (RC) beams using acoustic emission (AE) testing and ultrasonic pulse velocity (UPV) test. The present study reports on usage of AE and UPV testing methods on fracture mode in RC structures. Gaussian mixture modelling (GMM) method was used for crack classification. Support vector machine (SVM) method was
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A Vibration-Based Method for assessing the integrity of welded structures Nondestruct. Testing Eval. (IF 1.424) Pub Date : 2019-11-25 V. Rafael de la Cruz; K. Salehi Paniagua; P. Salgado Sánchez; P. García-Fogeda
ABSTRACT A Vibration-Based Method for assessing the integrity of welded structures is presented. The proposed technique relies on fitting theoretical predictions of a lumped mass-based model of the welding with experimental measurements obtained from modal analysis. Experiments are performed in various test platens that are soldered at one or two locations and exhibit distinct welding qualities, achieved
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AE source localization and imaging on cylindrical shell structures based on six-AE-sensor monitoring network and VTR focusing imaging Nondestruct. Testing Eval. (IF 1.424) Pub Date : 2019-11-19 Shaofeng Wang; Hailing Wang; Daorui Wang; Jianguo Wang; Wenliang Zhang; Jun Hong; Lin Gao
ABSTRACT This study is interested in how to utilise the virtual time reversal (VTR) technique to locate the continuous AE source in cylindrical shell structure. Thus, a six-AE-sensor monitoring network was designed to divide cylindrical surface into two symmetric semi-cylindrical monitoring areas whose four vertexes and two geometrical centres were defined as the measuring points. The AE source can
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Experimental investigation on the effect of glass fiber orientation on impact damage resistance under cyclic indentation loading using AE monitoring Nondestruct. Testing Eval. (IF 1.424) Pub Date : 2019-11-11 C. Suresh Kumar; V. Arumugam; Jack J. Kenned; R. Karthikeyan; A. R. Jac Fredo
ABSTRACT This paper investigates the effect of glass fibre orientation on the impact damage evolution and post-impact residual strength of glass/epoxy laminates, using mechanical and acoustic emission (AE) analysis. The glass fibre reinforced polymer (GFRP) composite laminates with stacking sequence such as 0°, 90°, [±45°] and [0°/90°] were tested. The indentation-induced damage behaviour was examined
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Modelling of locally damaged steel wire ropes Nondestruct. Testing Eval. (IF 1.424) Pub Date : 2019-10-29 Artem Khoroshev; Denis Shchuchkin; Alexandr Pavlenko; Vladimir Puzin
ABSTRACT This work examines various approaches proposed during the last fifty years, intended for the study of the scattering fields of topology (spotting the exact location) in the magnetic flaw detectors of steel wire ropes caused by damage in various types of wire ropes. In this study, the known steel wire rope models and their damages are compared. The preservation of low degree of reliability
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Non-destructive testing investigation of gaps in thin Glare laminates Nondestruct. Testing Eval. (IF 1.424) Pub Date : 2019-10-29 Patryk Jakubczak; Davide Nardi; Jarosław Bieniaś; Jos Sinke
ABSTRACT The manufacturing of Fibre Metal Laminates, consisting of alternating layers of pre-preg fibre and metal is complex, and defects can be introduced during manufacturing. The automation of the manufacturing steps is vital for future Glare production, and specific defects have to be considered. Among them, gaps between pre-preg plies represent a potential risk for the mechanical performances
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Probabilistic analysis of electromagnetic acoustic resonance signals for the detection of pipe wall thinning Nondestruct. Testing Eval. (IF 1.424) Pub Date : 2019-10-22 Noritaka Yusa; Haicheng Song; Daiki Iwata; Tetsuya Uchimoto; Toshiyuki Takagi; Makoto Moroi
ABSTRACT This study proposes a probability of detection (POD) model for the probabilistic analysis of the detectability of electromagnetic acoustic resonance (EMAR) method for the detection and evaluation of pipe wall thinning. Forty-one carbon steel plate samples with an artificially corroded groove were prepared to simulate pipe wall thinning caused by flow-assisted corrosion. Experiments were performed
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Relationship between ultrasonic pulse velocity and uniaxial compressive strength for cemented paste backfill with alkali-activated slag Nondestruct. Testing Eval. (IF 1.424) Pub Date : 2019-10-18 Haiqiang Jiang; Jing Han; Yuanhui Li; Erol Yilmaz; Qi Sun; Jianpo Liu
ABSTRACT This study mainly investigates the effects of binder content, water to binder (w/b) ratio, activator dosage, and sodium silicate to sodium hydroxide (SS/SH) ratio on uniaxial compressive strength (UCS) and ultrasonic pulse velocity (UPV) of cemented paste backfill (CPB) containing AAS (AAS-CPB). Experimental results show that both UPV and UCS of AAS-CPB increases linearly with increasing binder
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In situ monitoring of PVDF ultrasound transducers under gamma irradiation Nondestruct. Testing Eval. (IF 1.424) Pub Date : 2019-10-01 T. Kelley; K. Hutchings; M. Jenkinson; I. Dawson; K. Krawec; P. S. Miyagawa; J.H. Kern; R. Edge
Ultrasonic transducer (UT) systems are used for non-destructive testing and evaluation across a wide range of industries. In the nuclear industry, radiation damage of the UTs can lead to performance degradation or even complete failure. We have investigated the radiation resilience of a new piezo-polymer (PVDF) UT design. The irradiations were performed in a Cobalt-60 gamma facility with total ionising
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Fault feature and diagnostic method of bending micro- deformation of crankshaft of piston engine Nondestruct. Testing Eval. (IF 1.424) Pub Date : 2019-10-01 Zhilong Gao; Hanjiang Song; Yongdan Chen; Jinjie Zhang; Zhinong Jiang
ABSTRACT The crankshaft is the core component of a piston engine. Once a bending deformation fault occurs in the crankshaft, it can cause serious damage to the safe operation of the entire engine. However, diagnostic methods for detecting this fault are rare. In this paper, the influence of a bending micro-deformation of the crankshaft (BMDC) on the gear transmission system (GTS) was studied through
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Failure behavior and damage visualization of thick carbon/aramid hybrid woven composites under flexural loading conditions Nondestruct. Testing Eval. (IF 1.424) Pub Date : 2019-09-09 Wei Zhou; Han-Fei Yin; Ya-Jing Shang; Peng-Fei Zhang
This study presents an assessment of the failure behaviour and damage mechanisms of thick carbon/aramid hybrid woven composites with different fibre orientations in three-point bending test. The specimens are divided into 0° (principal material directions of aramid fibre), 90° (principal material directions of carbon fibre) and 45°, respectively. Acoustic emission (AE), infrared thermography (IRT)
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Relationship between acoustic emission signal and loads on pneumatic cylinders Nondestruct. Testing Eval. (IF 1.424) Pub Date : 2019-09-06 Houssam Mahmoud; Pavel Mazal; Frantisek Vlasic
This paper demonstrates the relationship between acoustic emission (AE) method parameters and loaded pneumatic cylinders. The cylinders in our experiment were loaded gradually by different weights in a vertical direction. The effect of the defect occurs when the cylinder is loaded at the retreat and progress strokes. This defect affects the relationship between the applied load and the recorded signal
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Non-destructive determination of microstructural/mechanical properties and thickness variations in API X65 steel using magnetic hysteresis loop and artificial neural networks Nondestruct. Testing Eval. (IF 1.424) Pub Date : 2019-09-05 Ali Mirzaee; Saeed Kahrobaee; Iman Ahadi Akhlaghi
In this paper, a combination of non-destructive magnetic technique and artificial neural networks is introduced, firstly, to ensure that the heat treatment process applied to a given API X65 steel sample results in desired microstructure and mechanical properties and secondly, to determine thickness variation which may occurs as a result of corrosion effect. To evaluate the effects of microstructure/mechanical
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Numerical study on how heterogeneity affects ultrasound high harmonics generation Nondestruct. Testing Eval. (IF 1.424) Pub Date : 2019-08-25 Negar Kamali; Ashkan Mahdavi; Sheng-Wei Chi
Finite element models with explicitly modelled mesoscale heterogeneity in material are introduced to numerically investigate the correlation between the ultrasonic higher harmonics and plastic deformation. The model predicts the changes of the second- and third-harmonics due to the plastic deformation in materials without the microstructural information and state variables at each loading step. The
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Nondestructive testing method and application for internal defect of metal balls Nondestruct. Testing Eval. (IF 1.424) Pub Date : 2019-08-12 Zhe Wang; Hai-Ming Pu; Yi-Hua Kang; Bao-Qiang Wang
Nondestructive testing for internal defects is necessary owing to the extensive application of metal balls in different industrial fields. The flat-bottom holes (FBHs) are used as the reference standards for the detection of internal defects. An ultrasonic measurement model with spherical-focused transducer based on multi-Gaussian beam is proposed to describe the detection of FBHs inside the metal
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