Review of Progress in Quantitative Nondestructive Evaluation: Volume 3a

ISBN-13: 9781468411966 / Angielski / Miękka / 2012 / 682 str.

Donald Thompson

Opis

This Proceedings contains the edited papers presented at the annual Review of Progress in Quantitative NDE held at the University of California, Santa Cruz, Aug. 7-12, 1983. In it, papers have been arranged topically by chapters and subsections rather than by order of presentation at the Review. The editors believe that this format is preferable as a reference volume. Thus, the Proceedings contains nine chapters and subsections which provide broad coverage of topics of current interest in NDE research and development. The Review was sponsored by the Center for Advanced NDE, Ames Laboratory of the U. S. Department of Energy, in cooperation with the Office of Basic Energy Sciences, USDOE, the Defense Advanced Research Projects Agency, the Materials Laboratory of the Air Force Wright Aeronautical Laboratories, and the Naval Sea Systems Command. Approximately 275 attendees representing various government agencies, industry, and academia participated in the technical presentations, poster sessions, and discussions. This Review, possibly the most comprehensive annual symposium in NDE, emphasizes both basic research and early engineering applications; it provides a valuable forum for the transfer of technical information. Para graphs given below provide a brief summary of the contents of the Proceedings. Chapter 1 consists of four papers that discuss elements of NDE Reliability and contains the keynote paper given by Dr. J. M. Coffey of the NDT Applications Centre, Central Electricity Generating Board, Manchester, England. In his paper, Dr."

Spis treści

1: NDE Reliability.- The Reliability of Ultrasonic Inspection: Developments in Quantitative NDE in the United Kingdom.- Use of Field-Flaw Inspection Theories to Quantify and Improve Inspection Reliability.- Quantifying NDI Capability for Damage Tolerance Analyses.- Human Factors Considerations in the Assessment of Nondestructive Evaluation Reliability.- 2: Ultrasonics.- Section A: Probability of Detection.- Ultrasonic Detection of Cracks in Web Geometries.- Ultrasonic Microstructural Noise Parameters in a Powder Metal Alloy.- Statistical Flaw Detection: Theory.- Statistical Flaw Detection: Application to Flaws Below Curved Surfaces.- Section B: Scattering.- Application of Multiple Scattering Theory to Sub-Surface Defects.- Resonances and Surface Waves in Elastic Wave Scattering from Cavities and Inclusions.- A New Parabolic Approximation to the Helmholtz Equation.- Crack-Tip Diffraction in a Transversely Isotropic Solid.- Scattering of Elastic Waves by Inclined Subsurface Cracks.- A Theoretical Model of Ultrasonic Examination of Smooth Flat Cracks.- Specular Reflection of Contacting Crack Faces.- Scattering of Obliquely Incident Rayleigh Waves by a Surface-Breaking Crack.- Scattering of Rayleigh Waves from Partly-Closed Surface-Breaking Cracks.- Interactions of Simulated Partially Closed Cracks with Acoustic Waves.- The Effects of Crack Closure on Ultrasonic Scattering Measurements.- SAW NDE Techniques for Monitoring the Growth Behavior of Small Surface Fatigue Cracks.- Measurement of Surface Machining Damage in Ceramics.- Surface Acoustic Wave Studies of Surface Cracks in Ceramics.- Crack Characterisation in Turbine Disks.- Section C: Sizing.- Laser-Induced Interior Cracks for Ultrasonic NDE.- Ultrasonic Sizing of Cracks in Web Geometries.- Further Results for Crack-Edge Mappings by Ray Methods.- Experimental Results on Crack Inversion.- New Multitransducer Techniques for Crack Characterisation.- Development of a Quantitative Flaw Characterization Module — A Status Report.- Section D: Transducers.- Comparison of Scattering Amplitudes from Various Transducers Using Diffraction and Attenuation Corrections.- Mechanically Assembled Non-Bonded Transducers Utilizing PVDF Film.- Novel Approaches to Broadband Transducer Design.- Section E: Signal Processing.- Homomorphic Processing in Ultrasonic NDE.- Polynomial Extrapolation Toward Low Frequencies of the Spectrum of Gated Ultrasonic Echoes for Deconvolution: Application to Defects in Solids.- Application of Diffraction Corrections to the Absolute Measurement of Scattering Amplitudes.- Absolute Magnitudes of Front Surface Reflections in Ultrasonic Measurements.- Effects of Deconvolution Procedures on Size Estimates in the Born Inversion Algorithm.- Section F: Imaging and Reconstruction.- Localization and Size Estimation of Cylindrical Flaws.- Sizing Defects Using Annular Array Techniques with an Automatic Ultrasonic Data Acquisition System.- Visualization of Surface-Breaking Flaws by Shadow Imaging.- ARMA Processing for NDE Ultrasonic Imaging.- High-Resolution Imaging of Thick Sections and Specimens with Irregular Surfaces Using Scanned Acoustical Holography.- Ultrasonic Imaging Analysis of Component Integrity.- 3: Eddy Currents.- Section A: Probability of Detection.- Eddy Current Test Samples, Probes, and Scanning System.- Experimental Methods for Eddy Current Probe Design and Testing.- Eddy Current Signal Calculations for Surface Breaking Cracks.- Statistical Detection Model for Eddy Current Systems.- Section B: Modeling.- Angular Spectrum Analysis Applied to Undercladding Flaws and Dipole Probes.- Numerical Modeling of Objects Near a Penetrable Interface.- Experimental Modeling of Eddy Current Inspection Capabilities.- Development of a 3-D Eddy Current Model for Nondestructive Testing Phenomena.- Experimental Measurements of the Eddy Current Signal Due to A Flawed, Conducting Half Space.- Finite Element Modeling of Pulsed Eddy Current Phenomena.- Estimates of Eddy Current Response to Subsurface Cracks from 2-D Finite Element Code Predictions.- Impedance of a Coil in the Vicinity of a Crack.- Section C: Sizing.- Fourier Descriptor Classification of Differential Eddy Current Probe Impedance Plane Trajectories.- Inversion of Eddy-Current Data and the Reconstruction of Flaws Using Multifrequencies.- Experimental Verification of an Inversion Algorithm for Flaw Characterization Using Eddy-Currents.- Computation of Eddy Current Signals and Quantitative Inversion with Realistic Probe Models.- Section D: Probes.- Theory of Electric Current Perturbation Probe Optimization.- Eddy Current Detection of Subsurface Cracks in Engine Disk Boltholes.- Ferrite Core Eddy Current Probe Models Description and Verification.- Evaluation of an Eddy-Current Tape-Head Probe.- Finite Element Analysis of Eddy Current Surface Probes.- Attendees.- Contributors.- Contributors Index.