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1. On the anisotropic attenuation behavior of the flexure mode of carbon fiber composites
Published: 7/28/2013
Authors: Brian M Burks, Marvin Arnold Hamstad
Abstract: In this work a coupled experimental-numerical approach was developed to study the anisotropic far field attenuation behavior of plate-type unidirectional carbon fiber composites. Experimentally a technique that utilizes a time-frequency analysis ...

2. On the anisotropic attenuation behavior of the flexure mode of carbon fiber composites
Published: 7/28/2013
Authors: Brian M Burks, Marvin Arnold Hamstad
Abstract: The uploaded document is the conference abstract. This particular conference is peer reviewed, requiring a 2 page abstract which is reviewed. Accepted works are invited to submit a full manuscript.

3. Re-examination of NIST Acoustic Emission Absolute Sensor Calibration: Part II: Finite Element Modeling of Acoustic Emission Signal from Glass Capillary Fracture
Published: 1/1/2011
Author: Marvin Arnold Hamstad
Abstract: A validated axisymmetric finite element code was used to model the out-of-plane displacement acoustic emission signal at 100 mm from a glass capillary fracture on the surface of a large steel block under the control of National Institute of Standard ...

4. On Lamb Modes as a Function of Acoustic Emission Source Rise Time
Published: 1/1/2010
Author: Marvin Arnold Hamstad
Abstract: A study was carried out to examine Lamb-wave modal content as a function of the acoustic emission (AE) source rise time. The study used a validated finite element code to model the source operation and subsequent wave propagation up to a distance of ...

5. Some Observations on Rayleigh Waves and Acoustic Emission in Thick Steel Plates
Published: 12/31/2009
Author: Marvin Arnold Hamstad
Abstract: Rayleigh waves in acoustic emission (AE) applications were examined for nominal 25 mm thick steel plates. Pencil lead breaks (PLBs) were introduced on the top and bottom surfaces as well as on the plate edge. The plate had large transverse dimensions ...

6. Comparison of Wavelet Transform and Choi-Williams Distribution to Determine Group Velocities for Different Acoustic Emission Sensors
Published: 12/31/2008
Author: Marvin Arnold Hamstad
Abstract: Acoustic emission (AE) sources in a plate generate dispersive Lamb waves. In this research, pencil lead breaks (PLBs) were made on an edge of a 3.1 mm thick aluminum alloy plate to generate such AE waves. The PLBs were made near the plate midplane an ...

7. Acoustic Emission Source Location in a Thick Steel Plate Using Lamb Modes
Published: 1/1/2007
Author: Marvin Arnold Hamstad
Abstract: Using a validated finite-element modeling code, buried out-of-plane (two dimensional code (2D)) and in-plane (three dimensional code (3D)) acoustic emission (AE) dipole point sources were operated at different depths below the top surface of a 25.4 m ...

8. Small Diameter Waveguide for Wideband Acoustic Emission
Published: 1/1/2006
Author: Marvin Arnold Hamstad
Abstract: The signals obtained from two wideband conical sensors were compared in the time, frequency and the time/frequency domains. The signals were generated by pencil lead-breaks on the surface (out-of-plane) or close to the midplane of the edge (in-plane) ...

9. Effects of Noise on Lamb-Mode Acoustic-Emission Arrival Times Determined by Wavelet Transform
Published: 12/1/2005
Authors: Marvin Arnold Hamstad, Agnes O'Gallagher
Abstract: Precise AE signal arrival times of the fundamental Lamb modes can be obtained from the arrival time of the peak wavelet transform (WT) magnitude at a particular frequency of interest. Since these arrival times are not determined from a fixed threshol ...

10. Modal-based identification of acoustic emission sources in the presence of electronic noise
Published: 12/1/2004
Authors: Marvin Arnold Hamstad, Agnes O'Gallagher
Abstract: Based on the results of an earlier study, a specific scheme was demonstrated to identify acoustic emission (AE) source types using ratios of Lamb-wave modal amplitudes from two radiation directions in a 4.7 mm thick aluminum plate. The modal amplitud ...

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