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Author: marvin hamstad

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11. Examination of the Application of a Wavelet Transformation to Acoustic Emission Signals: Part 2. Source Location
Published: 1/1/2002
Authors: Marvin Arnold Hamstad, Agnes O'Gallagher, John M. Gary
Abstract: In Part 2, (Part 1 Source Identification) the same finite-element-generated database of acoustic emission (AE) signals was used to examine the application of a wavelet transform (WT) to improve the accuracy of AE source location. The method utilizes ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=851302

12. Examination of the Application of a Wavelet Transformation to Acoustic Emission Signals: part 1. Source Identification
Published: 1/1/2002
Authors: Marvin Arnold Hamstad, Agnes O'Gallagher, John M. Gary
Abstract: A database of wideband acoustic emission (AE) modeled signals was used in Part 1 to examine the application of a wavelet transform (WT) to accomplish identification of AE sources. The AE signals in the database were created by use of a validted thre ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=851301

13. Effects of Lateral Plate Dimensions on Acoustic Emission Signals From Dipole Sources
Published: 12/1/2001
Authors: Marvin Arnold Hamstad, Agnes O'Gallagher, John M. Gary
Abstract: Using a validated three-dimensional finite element code, the out-of-plane displacements corresponding to model sources of acoustic emission (AE) were calculated in aluminum plate samples of two different lateral dimensions. Both samples were 4.7 mm ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=851235

14. Modeling of Buried Monopole and Dipole Sources of Acoustic Emission With a Finite Element Technique
Published: 12/1/1999
Authors: Marvin Arnold Hamstad, Agnes O'Gallagher, John M. Gary
Abstract: The requirements for dynamic finite element modeling of the source dynamics and wave propagation of buried acoustic emission point sources were examined. Maximum permissible source and cell sizes for point sources were determined as a function of th ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=851256

15. Detectability of Slow Crack Growth in Bridge Seels by Acoustic Emission
Published: 12/1/1998
Authors: Marvin Arnold Hamstad, Joseph David McColskey
Abstract: The detectabillity of slow crack growth of cracks in bridge steels has been studied by use of acoustic emission testing technology. Fatigue crack-growth rates of nominally 1x10^u-4^ mm/cycle (4x10^U-6^ in./cycle) and 1x10^u-3^ mm/cycle (4x10-5 in/c ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=851225

16. Wideband Acoustic Emission Displacement Signals as a Function of Source Rise-Time and Plate Thickness
Published: 8/1/1998
Authors: Marvin Arnold Hamstad, John M. Gary, Agnes O'Gallagher
Abstract: Using a dynamic finite element model, we studied the interrelationships between acoustic source rise-time and plate thickness in steel plates. The source was typically a midplane vertical dipole, and the out-of-plane displacement was obtained in the ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=851187

17. Development of Practical Wideband High-Fidelity Acoustic Emission Sensors
Published: 6/1/1995
Author: Marvin Arnold Hamstad
Abstract: The development of a series of wideband acoustic emission (AE) sensor/preamplifier systems is described. Key design factors are discussed along with the actual design and characterization of the sensors. These new sensors with integral amplificatio ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=851313

18. On the anisotropic attenuation behavior of the flexure mode of carbon fiber composites
Published: Date unknown
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 ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=913662



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