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Deformation Analysis Using Static, Kinematic and Dynamic Geodetic Deformation Models with GNSS: Deriner Dam, Artvin, Turkey Exp. Tech. (IF 1.058) Pub Date : 2021-01-25 B. Konakoglu
To serve the purpose of their establishment in a beneficial way, dams should be monitored periodically by geodetic or geotechnical methods. To this aim, in this study, geodetic deformation monitoring was conducted on the Deriner Dam, Turkey’s highest double–curvature concrete arc dam. The GNSS measurements were taken within 4 campaigns between the years 2016 and 2017. The geodetic deformation network
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Elastic Properties of Steel-Cord Rubber Conveyor Belt Exp. Tech. (IF 1.058) Pub Date : 2021-01-25 V. Golovanevskiy, A. Kondratiev
Reinforced with steel-cord rubber conveyor belt (SCB), i.e. a unidirectional composite material (CM) with some of the fundamental mechanical properties values of its reinforcement and matrix differing by a factor of ten thousand, is a key infrastructure component of overland minerals transportation industry. Critically, to date no investigative work has been performed on the mechanical behaviour of
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Digital Image Correlation as an Experimental Modal Analysis Capability Exp. Tech. (IF 1.058) Pub Date : 2021-01-20 Bryan L. Witt, Daniel P. Rohe
Digital image correlation (DIC) is an established test technique in several fields including quasi-static displacement measurements. Recently there has been growing interest in using DIC to measure structural dynamic response and even extract modal parameters from that information. While high-speed cameras have become more ubiquitous, there are no commercial end-to-end packages for modal analysis based
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Panel Shear of Plywood in Structural Sizes - Assessment Improvement Using Digital Image Correlation Exp. Tech. (IF 1.058) Pub Date : 2021-01-20 J. Viguier, B. Marcon, J. C. Butaud, L. Denaud, R. Collet
This paper introduces a new test configuration for the determination of panel shear properties in structural sizes. This original test configuration has been successfully applied to calculate the shear properties of beech plywood. A numerical model has been developed to evaluate the influence of such a novel setup in comparison to the common standard. The research includes the mechanical characterization
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The Effects of Strain on Stability of Passivation in Austenitic Stainless Steels: Comparison with Heat Treatment Exp. Tech. (IF 1.058) Pub Date : 2021-01-20 N. Srinivasan, S.S. Kumaran
The passive film mainly consists of oxides and hydroxide and is a key for corrosion protection of metallic materials. It increases the durability and performance of engineering components by spontaneous formation of effective, adherent barrier between the corrosive environment and a substrate. Herein, influence of plastic strain and after heat treatment on austenitic stainless steels was compared with
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Phase Shift Strategies in Phase Shifting Time Averaging Interferometry Exp. Tech. (IF 1.058) Pub Date : 2021-01-20 A. Styk, H. Dziubecka - Bala
Classical time-averaging interferometry technique is widely used for MEMS/MOEMS dynamic behavior investigations. It provides useful information on resonant vibration frequencies and mode shapes in the form of Bessel fringe images. To evaluate the information on objects’ vibration amplitude distribution, one needs to further process Bessel fringe images (besselograms). Among different available approaches
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Investigation on Reinforcement Incorporation Factor and Microstructure of Al 7075/Submicron-TiB 2 Metal Matrix Composites Processed through a Modified Liquid Metallurgy Technique Exp. Tech. (IF 1.058) Pub Date : 2021-01-12 B.P. Sahoo, D. Das
In this paper 0.8, 1.2, 1.6 and 2 wt.% of submicron-TiB2 particulate reinforced Al 7075 metal matrix composites (MMCs) were fabricated following a modified liquid metallurgy technique, which included ball milling, semi-solid stirring and ultrasonic agitation assisted squeeze casting method. Objective was to investigate their reinforcement incorporation factors (RIFs), microstructure through optical
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Correlation of Full-Field Dynamic Strain Measurements with Reverse Engineered Finite Element Model Predictions Exp. Tech. (IF 1.058) Pub Date : 2021-01-12 I.A. Sever, M. Maguire
Conventionally strain measurements are done in an intrusive way, and, at one or a few discrete points. In this paper, use of a 3D laser measurement system is explored for direct and full-field dynamic strain measurements on compressor and turbine rotor blades. The results are correlated to corresponding FE predictions in a systematic and quantified manner. The ability to measure strain maps on real
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Crack Propagation Detection Method in the Structural Fatigue Process Exp. Tech. (IF 1.058) Pub Date : 2021-01-12 X. Guo, Y.T. Yuan, Y. Liu
In this paper, a method for measuring crack propagation length in the structural fatigue process is presented. A convolutional neural network is presented to eliminate noise interference of matching marks and recognize crack features. The initial region of the crack band is obtained through the convolution neural network result. Based on the initial region, an improved algorithm for tip recognition
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Static Calibration and Dynamic Behaviour of a Six-Component Force Balance for Variable Pressure Water Tunnel Facilities Exp. Tech. (IF 1.058) Pub Date : 2021-01-09 D. Butler, S. M. Smith, P. A. Brandner, D. B. Clarke, B. W. Pearce
The presented six component force balance is a novel design used for many of the force measurements on hydrofoils and other bodies in the University of Tasmania’s cavitation tunnel. This balance is a versatile piece of equipment, the distribution of its six load cells gives it a high degree of sensitivity and stiffness in all directions. The accuracy of the balance in operating conditions has yet to
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Experimental Study on the Performance Characteristics of Non-asbestos Brake Pads Using a Novel Friction Testing Machine Exp. Tech. (IF 1.058) Pub Date : 2021-01-08 H. Öktem, I. Uygur, G. Akıncıoğlu, A. Kurt
The friction, wear and mechanical properties of a new non-asbestos brake pad formulation called Premix were investigated. A novel friction-testing machine was utilized to determine tribological behavior. The tribological, physical and mechanical properties of the brake pads were measured and their friction surface morphology was explored via optical and scanning electron microscopy. Results showed
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Characterisation of Steel Components Fatigue Life Phenomenon Based on Magnetic Flux Leakage Parameters Exp. Tech. (IF 1.058) Pub Date : 2021-01-08 N.H. Anuar, S. Abdullah, S.S.K. Singh, A. Arifin
The metal magnetic memory (MMM) method is highly effective in assessing the extent of early damage, such as fatigue crack in ferromagnetic components due to the existence of stress concentration zones (SCZs). However, there are limited studies on the relationship between the magnetic signal parameter in predicting the fatigue life of ferromagnetic components. With the advent of information relating
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Damage Detection in Lightweight Structures Using Artificial Intelligence Techniques Exp. Tech. (IF 1.058) Pub Date : 2021-01-08 A. Tavares, E. Di Lorenzo, B. Peeters, G. Coppotelli, N. Silvestre
Reliable and efficient damage detection is critical for the use of lightweight materials in the mechanical and aerospace industries. Within the context of Non-Destructive Testing (NDT), vibration-based tests have been applied for many decades to inspect components without damaging or debilitating their use. For posterior fault recognition, Artificial Intelligence techniques have achieved high success
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Gas Seepage Under Continuous and Step Loading Based on True Triaxial Seepage Test Apparatus Exp. Tech. (IF 1.058) Pub Date : 2021-01-08 Y. Zhang, J. Zhang, W. Du, H. Wang, K. Niu
The conventional triaxial loading in gas seepage studies does not reflect the actual stressing state in the coal seam. Thus, a true triaxial seepage experimental apparatus is developed before seepage tests are conducted with it. The first group of tests is carried out with continuous axial loading under uniform lateral constrain on moulded coal specimen: one test under constant-velocity axial loading
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Modal Investigation of Vortex Ring Shedding from an Oscillating Disc Exp. Tech. (IF 1.058) Pub Date : 2021-01-08 F. Gökhan Ergin
Vortex shedding from an oscillating disc with a chamfered tip is investigated at a Reynolds number of 8715 and a Keulegan–Carpenter number of 0.6. The experiments are performed using a high-speed Particle Image Velocimetry (PIV) system with 160 Hz frame acquisition frequency. Six full cycles are recorded with a total of 1999 recordings, i.e. 333 velocity measurements resolving a single cycle. The 175-mm-diameter
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Application of Digital Image Correlation (DIC) Technique for Semi Interlocking Masonry (SIM) Panels under Large Cyclic In-Plane Shear Displacement Exp. Tech. (IF 1.058) Pub Date : 2021-01-07 M. Akhtar Hossain, Y.Z. Totoev, M.J. Masia
Semi interlocking masonry (SIM) is an innovative masonry building system which is being developed in the Centre for Infrastructure Performance and Reliability at The University of Newcastle, Australia. It utilizes a special method of interlocking of mortar-less engineered masonry panels made of semi-interlocking masonry (SIM) units which possess significant energy dissipation capacity due to friction
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Taguchi- Grey Theory Based Harmony Search Algorithm (GR-HSA) for Predictive Modeling and Multi-Objective Optimization in Drilling of Polymer Composites Exp. Tech. (IF 1.058) Pub Date : 2021-01-07 J. Kumar, R.K. Verma, A.K. Mondal
This paper deals with a new hybridization methodology of Grey integrated Harmony search algorithm (GR-HSA) for predictive modeling. Simultaneously, parametric optimization during drilling of Graphite reinforced epoxy composites using the TiAlN coated SiC drill. Three process constraints namely spindle speed (N), feed (F), and wt.% of Graphite (G%), varied at four discrete levels, and Taguchi-based
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Experimental Study of a Disk Diaphragm Thickness Influence on a Planar Shock Wave Formation and Position During its Propagation in a Gas Shock Tube Exp. Tech. (IF 1.058) Pub Date : 2021-01-07 F. Sardarzadeh, J. Zamani
A Shock tube is a piece of equipment in which, by creating a pressure difference between the driver and the driven section via the bursting membrane, it has the ability to generate shock waves with very short rise time. One of the important parameters in the shock tube is the planar shock wave and the distance of its formation along the driven section. In this study, the shock wave pressure was measured
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Determination of Long-Term Creep Properties for 316H Steel Using Short-Term Tests on Pre-strained Material Exp. Tech. (IF 1.058) Pub Date : 2021-01-07 H. Zhou, A. Mehmanparast, K. Nikbin
Determination of long-term creep rupture properties for 316H steel is both costly and time-consuming and given the level of scatter in the data would need substantial number of tests to be performed. The primary objective of this study is to estimate the long-term creep properties of cross-weld (XW) and as-received (AR) 316H stainless steel by performing accelerated tests on pre-compressed (PC) material
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Mast Arm Monitoring via Traffic Camera Footage: A Pixel-Based Modal Analysis Approach Exp. Tech. (IF 1.058) Pub Date : 2021-01-07 M. H. SoleimaniBabakamali, A. Moghadam, R. Sarlo, M. H. Hebdon, P. S. Harvey
Traffic signal mast arm structures must be regularly inspected for cracking, bolt loosening, and other signs of deterioration. Due to large inventories, physical inspections and/or dedicated monitoring systems can be prohibitively time-consuming and expensive to implement at a large scale. However, the growing use of vision-based methods for structural monitoring applications introduces the possibility
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Correction to: New Frontiers and Innovative Methods for Hybrid Simulation Exp. Tech. (IF 1.058) Pub Date : 2020-12-09 S.J. Dyke, O.S. Bursi, B. Stojadinovic
A Correction to this paper has been published: https://doi.org/10.1007/s40799-020-00424-2
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Visible Light Refraction Effects on High-Speed Stereo Digital Image Correlation Measurement of a Thin Panel in Mach 2 Flow Exp. Tech. (IF 1.058) Pub Date : 2020-12-02 Timothy J. Beberniss, David A. Ehrhardt
This study utilized a Mach 2 wind tunnel, Research Cell 19 (RC-19), where the panel specimen became part of the test section top wall. Two stereo digital image correlation (3D-DIC) systems simultaneously acquired displacement measurements both with and without flow by filming the front and back sides of the panel. The two DIC results were then compared to note if any changes between the two measurements
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Image Processing and Edge Detection Techniques to Quantify Shock Wave Dynamics Experiments Exp. Tech. (IF 1.058) Pub Date : 2020-12-01 L. Zheng, B. Lawlor, B.J. Katko, C. McGuire, J. Zanteson, V. Eliasson
Experimental studies of multiple shock wave interaction to study transition from regular to irregular reflection rely on the processing of a large amount of schlieren photographs. Here we present an automated algorithm to track individual shock fronts and triple points. First, correction to any optical distortions is applied to the photographs. Next, noise removal and edge detection algorithms are
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Optimum Design of a Ring-Shaped Clip Gauge Exp. Tech. (IF 1.058) Pub Date : 2020-11-24 P. Thanakun, J. Kasivitamnuay, P. Singhatanadgid
The optimisation methodology was applied to design a specific geometry for a ring-shaped clip gauge as a quasi-static displacement measurement. The gauge was designed to maximise sensitivity under various types of constraints, including working range, strength, and installation. The analytical expressions of the ring gauge’s responses and constraints were derived to formulate an optimisation problem
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Estimation and Experimental Validation of Mean-Field Homogenised Effective Properties of Composite Exp. Tech. (IF 1.058) Pub Date : 2020-11-23 A. Sharma, V. Rastogi, A.K. Agrawal
For composite materials, the system response changes abruptly with a change in the properties of the material. Therefore, attaining significant knowledge about the effect of the material composition on the material properties is crucial. The researchers are looking for new computational methods which can predict these alterations so that the effort in experimental testing can be reduced. In this direction
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A Brief Review and Advances of Thermographic Image - Processing Methods for IRT Inspection: a Case of Study on GFRP Plate Exp. Tech. (IF 1.058) Pub Date : 2020-11-23 F.W. Panella, A. Pirinu, V. Dattoma
The present work introduces a different data processing strategy, proposed in order to improve sub-surface defect detection on industrial composites; in addition, a resume of thermal data processing with most common algorithms in literature is presented and applied with new data. A deep comparison between the common absolute contrast, DAC, PCT, TSR and derivative methods and a new proposed contrast
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Perspectives and Approaches for the Out-of-Plane Testing of Masonry Infill Walls Exp. Tech. (IF 1.058) Pub Date : 2020-11-23 A. Furtado, A. Arêde, J. Melo, H. Rodrigues, N. Pinto, H. Varum
It is widely accepted that further and more in-depth research is required on the out-of-plane seismic response of masonry infill walls to increase knowledge regarding this particular behaviour and to develop effective strengthening strategies for preventing their collapse. However, such experimental tests are difficult to perform and the scientific community recognizes the complexity inherent to the
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Experimental Modal Analysis Using Phase Quantities from Phase-Based Motion Processing and Motion Magnification Exp. Tech. (IF 1.058) Pub Date : 2020-11-18 D.P. Rohe, P.L. Reu
Phase-based motion processing and the associated Motion Magnification that it enables has become popular not only for the striking videos that it can produce of traditionally stiff structures visualized with very large deflections, but also for its ability to pull information out of the noise floor of images so that they can be processed with more traditional optical techniques such as digital image
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Six-axis Load Head with Application to Electrical Conductor Nonlinear Dynamics Exp. Tech. (IF 1.058) Pub Date : 2020-11-16 Y. Fu, M. V. Sivaselvan, R. Staniszewski, S. Weinreber, N. D. Oliveto
The development of a six-axis load head based on the Stewart platform concept is described in this paper. The intended application of the device is in quantifying terminal forces and moments in flexible conductors interconnecting equipment in electrical substations. Such quantification is important is assessing seismic demand both at the terminal connections and in the equipment. In particular, nonlinear
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Shock Wave Pressure and Velocity Measuring Using a Novel Optic Sensor in a Newly Designed Diaphragm-less Shock Tube Exp. Tech. (IF 1.058) Pub Date : 2020-10-27 M.A. Samimi, J. Zamani, F. Sardarzadeh
This paper suggests a new optical system for measuring shock wave characteristic that is installed in a shock tube. This shock tube has an innovative pneumatic rapid opening valve designed to open from the center of the tube to the corners. In this measurement system, a plate has placed in front of the shock wave. The plate displacement has measured during a collision by measuring the amount of light
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Diagnostics Based on Continuous Scanning LDV Measurements and RASTAR Analysis Method Exp. Tech. (IF 1.058) Pub Date : 2020-10-02 D. Di Maio, S. Bruinsma, T. Tinga
This paper presents a technique for rapid diagnostics of structural integrity that exploits spectral sidebands measured by the continuous scanning LDV (CSLDV) measurement method. Structural integrity can be monitored by Operational Deflection Shapes ODSs, which can be quickly measurable at any excitation frequency when a laser continuously scans a vibrating surface. The LDV output time series is an
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Multiaxial and Uniaxial Fatigue Failure Evaluation Using Modal Velocities Exp. Tech. (IF 1.058) Pub Date : 2020-09-25 K. Kersch, E. Woschke
The presented work aims at evaluating the results of uniaxial and multiaxial fatigue failure tests using velocity and acceleration measurements. A specimen containing damaging modes at different eigenfrequencies is introduced. The tests are conducted on an electrodynamic 3D-shaker system using a random vibration environment. Different fatigue times are observed between uniaxial and multiaxial excitation
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Effect of Fiber Orientation on Nonlinear Damping and Internal Microdeformation in Short-Fiber-Reinforced Natural Rubber Exp. Tech. (IF 1.058) Pub Date : 2020-09-23 M. Matsubara, S. Teramoto, A. Nagatani, S. Kawamura, N. Tsujiuchi, A. Ito, M. Kobayashi, S. Furuta
Nonlinear damping with respect to vibration amplitude is particularly important in mechanical dynamics. The addition of short fibers to damping materials is considered to result in strong nonlinear damping due to interfacial peeling at the edges of the fibers. However, little has been reported on the occurrence of nonlinear damping in short-fiber reinforced rubber due to compounding difficulties. In
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In-Situ Full-Field Strain Measurement at the Sub-grain Scale Using the Scanning Electron Microscope Grid Method Exp. Tech. (IF 1.058) Pub Date : 2020-09-21 Hadi Mirmohammad, Tristan Gunn, Owen T. Kingstedt
Full-field measurement techniques are invaluable tools for investigating material behavior across length-scales. In the current work, a full-field measurement technique, the Grid Method, is implemented within a scanning electron microscope to demonstrate its ability to capture deformation heterogeneities at sub-grain length-scales. Microgrids, fabricated using focused ion beam platinum deposition are
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Predicting 3D Motions from Single-Camera Optical Test Data Exp. Tech. (IF 1.058) Pub Date : 2020-09-18 D.P. Rohe, B.L. Witt, T.F. Schoenherr
In a typical optical test, a stereo camera pair is required to measure the three-dimensional motion of a test article; one camera typically only measures motions in the image plane of the camera, and measurements in the out-of-plane direction are missing. Finite element expansion techniques provide a path to estimate responses from a test at unmeasured degrees of freedom. Treating the case of a single
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Method for Evaluating Potential Maximum Shear Strain for a Fine Metal Wire in Torsion Testing Exp. Tech. (IF 1.058) Pub Date : 2020-09-17 S. Gondo, H. Akamine, R. Mitsui, S. Kajino, M. Asakawa, K. Takemoto, K. Tashima, S. Suzuki
The torsion number of drawn fine high carbon steel wires was measured through torsion testing. The angles between the scratches on the tested wire surface and its longitudinal axis were measured. The shear strain calculated from torsion number γt, shear strain at fractured point γf, and plastic shear strain γpc were evaluated. The following results were obtained. First, the shear strain distribution
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Identification of Bending Modes of Vibration in Rails by a Laser Doppler Vibrometer on a Moving Platform Exp. Tech. (IF 1.058) Pub Date : 2020-09-11 K. Kaynardag, G. Battaglia, A. Ebrahimkhanlou, A. Pirrotta, S. Salamone
This paper introduces a method to identify the bending modes of vibration of railway tracks by using a laser Doppler vibrometer (LDV) mounted on a moving platform. Two sets of experiments were conducted at Transportation Technology Center Inc. (TTCI) in Pueblo Colorado, in order to validate the proposed method. First, the bending vibration modes were identified using the signals collected from a rail
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Aeroelastic Vibration Measurement Based on Laser and Computer Vision Technique Exp. Tech. (IF 1.058) Pub Date : 2020-09-11 H.V. de Figueiredo, D.F. Castillo-Zúñiga, N.C. Costa, O. Saotome, R.G.A. da Silva
The new aeronautical structures have become more flexible and light weight to reduce energy consumption, emissions, and noise, and to operate at high altitudes for long periods in the air, such as those required in the NASA Helios project. The increased structural flexibility of these aircraft has reignited concerns related to aeroelastic instabilities, such as flutter. Improving the techniques and
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Performance of the Expanded Virtual Point Transformation on a Complex Test Structure Exp. Tech. (IF 1.058) Pub Date : 2020-09-09 T. Bregar, A. El Mahmoudi, G. Čepon, D. J. Rixen, M. Boltežar
The Virtual Point Transformation (VPT) makes it possible to experimentally identify the full DoF FRF matrix by projecting the measured displacements onto the Interface Deformation Modes (IDMs). The VP FRFs were already successfully used in Frequency-Based Substructuring (FBS); however, the VPT is susceptible to deviations in the impact location and orientation, as well as to deviations in the sensor’s
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Real-Time Hybrid Testing of Strut-Braced Wing Under Aerodynamic Loading Using an Electrodynamic Actuator Exp. Tech. (IF 1.058) Pub Date : 2020-09-04 V. Ruffini, C. Szczyglowski, D. A. W. Barton, M. Lowenberg, S. A. Neild
Real-Time Hybrid Simulation (RTHS) is an experimental framework that allows the testing of components or substructures under realistic, dynamic boundary conditions, by imposing the reactions calculated from a model of the rest of the assembly through one or more actuators. In the context of rapid prototyping of mechanical components, RTHS could be used to explore the design space of a device while
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Seismic Vulnerability Analysis of a Coupled Tank-Piping System by Means of Hybrid Simulation and Acoustic Emission Exp. Tech. (IF 1.058) Pub Date : 2020-09-01 O. Sayginer, R. di Filippo, A. Lecoq, A. Marino, O.S. Bursi
In order to shed light on the seismic response of complex industrial plants, advanced finite element models should take into account both multicomponents and relevant coupling effects. These models are usually computationally expensive and rely on significant computational resources. Moreover, the relationships between seismic action, system response and relevant damage levels are often characterized
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Modal Parameter Estimation of a Compliant Panel Using Phase-based Motion Magnification and Stereoscopic Digital Image Correlation Exp. Tech. (IF 1.058) Pub Date : 2020-08-24 M. Eitner, M. Musta, L. Vanstone, J. Sirohi, N. Clemens
This paper demonstrates the use of broad-band phase based motion magnification (PMM) to improve the modal parameter estimation from high-speed stereoscopic digital image correlation (DIC). PMM is used as a diagnostic technique to investigate the free vibration response of a panel. The compliant panel, consisting of a thin polycarbonate sheet, forms a test section wall in a supersonic blow-down wind
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Identifying Stochastic Frequency Response Functions Using Real-Time Hybrid Substructuring, Principal Component Analysis, and Kriging Metamodeling Exp. Tech. (IF 1.058) Pub Date : 2020-08-18 C. Ligeikis, R. Christenson
Real-time hybrid substructuring (RTHS) has previously been shown to be an effective tool to quantify the effect of parametric uncertainties on the response of a structural system. Proposed and implemented in this paper is a method that combines RTHS, Principal Component Analysis, and Kriging to metamodel the frequency response functions of a structure. The proposed method can be used to account for
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Testing Platform and Delay Compensation Methods for Distributed Real-Time Hybrid Simulation Exp. Tech. (IF 1.058) Pub Date : 2020-08-13 H. L. Sadraddin, M. Cinar, X. Shao, M. Ahmed
Real-time hybrid simulation (RTHS) plays an essential role in understanding the time-dependent behavior of structures when subject to extreme hazard loadings in civil engineering research. During RTHS, physical experiment on critical substructure component(s) and numerical simulation of the remaining structure are seamlessly integrated to obtain the whole structural response at the system level. To
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Viability of Image Compression in Vibrothermography Exp. Tech. (IF 1.058) Pub Date : 2020-08-12 X. Chi, Y. Zhang, D. Di Maio, N.A.J. Lieven
This research focuses on the verification of the viability of image compression in infrared thermography in order to address the problem of data storage. Specifically, images from vibrothermographic tests were utilized due to their special characteristics compared to the results from alternative infrared thermography techniques, which are able to introduce additional uncertainties to the compression
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Dynamic Tensile Characterization of Thin-Sheet Brittle Metallic Materials Exp. Tech. (IF 1.058) Pub Date : 2020-07-22 B. Sanborn, M. Hudspeth, B. Song
Refractory metals are favorable materials in applications where high strength and ductility are needed at elevated temperatures. In some cases, operating temperatures may be near the melting point of the material. However, as temperature drops, refractory metals typically undergo a significant mechanical response change - ductile-to-brittle transition. These materials may be subjected to high strain
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Correction to: Material and Mechanical Characterization of Multi-Functional Carbon Nanotube Reinforced Hybrid Composite Materials Exp. Tech. (IF 1.058) Pub Date : 2020-07-14 A. Paul Praveen, V. Rajamohan, A.T. Mathew
In the original article, the first author A. Paul Praveen’s name was mentioned incorrectly in the author list. The details given in this correction are correct.
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Analysis of Vibration Signals of Drivetrain Failures in Wind Turbines for Condition Monitoring Exp. Tech. (IF 1.058) Pub Date : 2020-06-30 M. J. Gómez, P. Marklund, D. Strombergsson, C. Castejón, J. C. García-Prada
In the last years, the wind industry has increased in a large scale. A wind turbine out of service leeds to high costs due to both maintenance and repair costs and the incapability of producing electricity. A substantial part of the wind turbine failures are in the drivetrain, mainly in generator and gearbox. Several recent works focuses in the study of benefits of the integration of condition monitoring
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Performance and Limitations of Real-Time Hybrid Simulation with Nonlinear Computational Substructures Exp. Tech. (IF 1.058) Pub Date : 2020-06-29 E. E. Bas, M. A. Moustafa
Hybrid simulation (HS) and real-time HS (RTHS) are widely used experimental techniques to evaluate the seismic performance of structural components and full systems. The goal of this study is to investigate the performance and limitations of RTHS when the computational model involves complex and highly nonlinear behavior, mainly due to both stiffness and strength deterioration. To establish the case
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Novel Cyclic Fatigue Testing Machine for Endodontic Files Exp. Tech. (IF 1.058) Pub Date : 2020-06-29 F. Lo Savio, G. La Rosa, M. Bonfanti, D. Alizzio, E. Rapisarda, E. Pedullà
The characteristics of superelasticity and shape-memory of the NiTi make endodontic rotary files suitably flexible and resistant while operating within curved canals. However, continuous rotation within accentuated curvatures causes stresses that can lead to intraoperative fracture by torsional shear or flexural cyclic fatigue. The aim of this paper is to design and build a rotary bending testing machine
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Pile Length Estimate of Impulse Response Testing with Guided Wave Approach Exp. Tech. (IF 1.058) Pub Date : 2020-06-16 Helsin Wang
The constant velocity one-dimensional wave theory has been commonly used to determine the pile lengths from the impulse response testing results for several years. In this paper, the three-dimensional guided wave theory was introduced to extract more information from the impulse response spectra on five concrete piles. Combined with resonance concept, this guided wave-based approach was developed to
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Exploiting Parallel Computing to Control Uncertain Nonlinear Systems in Real-Time Exp. Tech. (IF 1.058) Pub Date : 2020-06-10 J. Condori, A. Maghareh, J. Orr, H.-W. Li, H. Montoya, S. Dyke, C. Gill, A. Prakash
Control is a critical element in many applications and research such as experimental testing in real-time. Linear approaches for control and estimation have been widely applied to real-time hybrid simulation (RTHS) techniques in tracking the physical domain (plant). However, nonlinearities and highly uncertainties of the plant impose challenges that must be properly addressed using nonlinear control
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An Adaptive Controller for Hybrid Fire Testing Exp. Tech. (IF 1.058) Pub Date : 2020-06-10 S. Renard, J.-C. Mindeguia, F. Robert, S. Morel, J.-M. Franssen
To experimentally assess the fire resistance of civil structures, testing whole structures is very costly but the standard tests on individual structural elements can sometimes be too simplistic, regarding their boundary conditions. Hybrid fire testing is then a promising approach to overcome some of these limitations. In order to perform such tests, the existing procedures make use of estimated parameters
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Realization of Constant Voltage Anemometer Using an Alternative Signal Conditioning Circuit Exp. Tech. (IF 1.058) Pub Date : 2020-06-03 V. Sivakami, A. Pal, B. Vasuki
Anemometric method is the most accurate and reliable technique for air velocity measurement. In present work, a voltage follower based circuit is proposed, and a low-cost sensor (tungsten filament) is chosen to perform Constant Voltage Anemometer (CVA) operation for air velocity measurement. For performing the real-time experiment, a wind tunnel featuring a rectangular section (test section I) and
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Data-driven Arbitrary Polynomial Chaos Expansion on Uncertainty Quantification for Real-time Hybrid Simulation Under Stochastic Ground Motions Exp. Tech. (IF 1.058) Pub Date : 2020-06-03 M. Chen, T. Guo, C. Chen, W. Xu
Uncertainties in real-time hybrid simulation include structural parameters and ground motion. Uncertain parameters often do not follow common distribution types. Data-driven arbitrary polynomial chaos constructs optimal orthogonal polynomial basis based on the sample data without distribution assumption. In this study, the data-driven polynomial chaos is compared with other generalized polynomial chaos
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Power-Flow-Based Stabilization for Adaptive Feedforward Filters in Hybrid Testing Exp. Tech. (IF 1.058) Pub Date : 2020-06-03 A. Bartl, L.D.H. Peiris, J.L. du Bois, D.J. Rixen, A. Plummer
Real-time hybrid testing is a technology which allows the coupling of simulations and component tests in order to simulate complex system dynamics. Delays and time lags caused by actuator dynamics and signal processing deteriorate the stability of the tests in many cases. The application of adaptive feedforward filters to hybrid testing enables circumventing this problem. The stability of the filter
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Analysis of Yield Criteria and Flow Curves on FLC for TWIP900 Steel Exp. Tech. (IF 1.058) Pub Date : 2020-05-29 S. Kilic, F. Ozturk, S. Toros
In this study, the applicability of yield criteria and flow curve models to predict forming limit curve (FLC) via the Marciniak-Kuczynski (M-K) model is investigated for TWIP900 steel. Forming limit characteristics of TWIP900 are determined experimentally and numerically. The yield criteria of Hill48, Barlat89, YLD2000-2d, and BBC2000 are tested and compared with each other. Results indicate that the
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Cyclic Properties of Artificially Cemented Gravel-Silty Clay Mixed Soils Exp. Tech. (IF 1.058) Pub Date : 2020-05-27 H.-j. Yu, E.-l. Liu
The aim of this paper is to provide an insight into the effect of fine content (FC) on the artificially cemented gravel-silty clay mixed soils (CMS) in terms of strength, deformation, effective stress path and pore pressure response by undrained cyclic triaxial tests. In addition, some cyclic triaxial tests were also conducted on remolded gravel-silty clay mixed soils (RMS) under the same test conditions
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Stability in Hybrid Fire Testing Using PI Control Exp. Tech. (IF 1.058) Pub Date : 2020-05-27 E. Mergny, G. Drion, J.-M. Franssen
Widely used in earthquake engineering, Hybrid testing is promoted in various domains such as wind engineering, coastal structures and fluid-structure interaction. It also begins to be applied to fire engineering (Hybrid Fire Testing or HFT) for coupling fire tests and numerical simulations. However, HFT is still in its infancy. Yet, some tests have been performed and some algorithms have been developed
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A Mechanical Device to Evaluate the Effects of Dynamic Loading in Weak-acid Medium on the Bioapatite of Devitalized Cortical Bone Exp. Tech. (IF 1.058) Pub Date : 2020-05-27 M. Zhovner, A.N. Kalinkevich, S.N. Danilchenko, V.N. Kuznetsov, J. Wang, H. Li, J. He, X. Feng
A new device that enables the application of controlled mechanical loads to devitalized cortical bone blocks in liquid media mimicking physiological environment is described. In the setup, it is possible to evaluate elimination of calcium from a bone during the exposure to slightly acidic media in the presence or absence of periodic controlled mechanical load. In the test experiments with the fragments
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