38 Result(s)
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Engineering
Characterization and Evaluation of Materials
Vibration, Dynamical Systems, Control
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Article
Photothermal radiometric detection and imaging of surface cracks
This paper discusses surface crack detection by photothermal radiometric imaging (PRI). In PRI, also called dynamic infrared scanning, a surface is scanned with a spot of heat. Imperfections are detected by ra...
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Article
The double-light-beam method in three-dimensional scattered-light photoelasticity
This paper presents a new scattered-light photoelasticity technique which may be called the double-light-beam measurement method. Principal-stress directions and relative retardations related to the principal-...
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Article
A Curvature-ovalization measurement apparatus for circular tubes under cyclic bending
In this paper, the authors report the design and construction of a new measurement apparatus, along with the result of its testing. This apparatus can be placed at the midspan of the circular tube specimen and...
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Article
Failure loads of spot weld specimens under impact opening and shear loading conditions
Failure loads of spot weld specimens are investigated under impact combined loading conditions. A set of test fixtures was designed and used to obtain failure loads of mild steel spot weld specimens under comb...
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Article
Upper limit of constant strain rates in a split Hopkinson pressure bar experiment with elastic specimens
The upper limit of the achievable constant strain rates in linearly elastic specimens loaded by a split Hopkinson pressure bar is estimated based on the specimen properties and a linear ramp loading. The crite...
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Article
Recent Progress in Digital Image Correlation
In this paper, we report the following important progress recently made in the basic theory and practical implementation of digital image correlation (DIC) for deformation measurement. First, we answer a basic...
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Article
Constitutive Model Calibration for Powder Compaction Using Instrumented Die Testing
Calibration procedures for constitutive models for powder compaction are presented. A practical calibration method based on a die compaction experiment is presented. A newly developed apparatus consisting of a...
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Article
Characterization of Wire Rope Defects with Gray Level Co-occurrence Matrix of Magnetic Flux Leakage Images
Magnetic flux leakage (MFL) techniques are used extensively for non-intrusively detecting and characterizing wire rope defects. Traditionally, MFL signals are captured with induction coil sensors. However, the...
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Article
Digital Image Correlation with Self-Adaptive Gaussian Windows
A novel subpixel registration algorithm with Gaussian windows is put forward for accurate deformation measurement in digital image correlation technique. Based on speckle image quality and potential deformatio...
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Article
Fast, Robust and Accurate Digital Image Correlation Calculation Without Redundant Computations
High-efficiency and high-accuracy deformation analysis using digital image correlation (DIC) has become increasingly important in recent years, considering the ongoing trend of using higher resolution digital ...
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Article
High-Accuracy 2D Digital Image Correlation Measurements with Bilateral Telecentric Lenses: Error Analysis and Experimental Verification
By comparing two digital images of a test planar specimen surface recorded in different configurations, two-dimensional digital image correlation (2D-DIC) provides full-field displacements to sub-pixel accurac...
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Article
Diffraction-Assisted Image Correlation for Three-Dimensional Surface Profiling
The recently developed Diffraction-Assisted Image Correlation (DAIC) method (**a et al. Exp Mech 53(5):755–765, 2013) provides a simple and accurate means for three-dimensional (3D) full-field deformation measure...
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Article
Comparison of Subset-Based Local and Finite Element-Based Global Digital Image Correlation
Digital image correlation (DIC) techniques require an image matching algorithm to register the same physical points represented in different images. Subset-based local DIC and finite element-based (FE-based) g...
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Article
Random Errors in Digital Image Correlation Due to Matched or Overmatched Shape Functions
The random errors of subset-based digital image correlation due to the use of matched or overmatched shape functions are investigated. Governing formulations that can quantitatively predict these random errors...
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Article
Digital Image Correlation with Enhanced Accuracy and Efficiency: A Comparison of Two Subpixel Registration Algorithms
The two major subpixel registration algorithms, currently being used in subset-based digital image correlation, are the classic Newton-Raphson (FA-NR) algorithm with forward additive map** strategy and the r...
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Article
Color Stereo-Digital Image Correlation Method Using a Single 3CCD Color Camera
This paper presents a novel color stereo-digital image correlation (stereo-DIC) method using a single 3CCD color camera for full-field shape, motion, and deformation measurements without any sacrifice of the c...
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Article
Simulation of Laser Ultrasonics for Detection of Surface-Connected Rail Defects
Laser ultrasonic produces frequencies in the MHz range, enabling high accuracy and a strong ability to detect rail surface defects. This paper mainly studied on the simulation of detecting surface-connected ra...
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Article
A Review of Speckle Pattern Fabrication and Assessment for Digital Image Correlation
As a carrier of deformation information, the speckle pattern, or more exactly the random intensity distributions, which could be naturally occurred or artificially fabricated onto test samples’ surface, plays ...
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Article
In-Situ Systematic Error Correction for Digital Volume Correlation Using a Reference Sample
The self-heating effect of a laboratory X-ray computed tomography (CT) scanner causes slight change in its imaging geometry, which induces translation and dilatation (i.e., artificial displacement and strain) ...
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Article
Full-Field Surface 3D Shape and Displacement Measurements Using an Unfocused Plenoptic Camera
Full-field surface 3D shape and displacement measurements using a single commercial unfocused plenoptic camera (Lytro Illum) are reported in this work. Before measurements, the unfocused plenoptic camera is ca...
