Method and apparatus for determining material structural integrity
Abstract
Disclosed are a nondestructive method and apparatus for determining the structural integrity of materials by combining laser vibrometry with damping analysis to determine the damping loss factor. The method comprises the steps of vibrating the area being tested over a known frequency range and measuring vibrational force and velocity vs time over the known frequency range. Vibrational velocity is preferably measured by a laser vibrometer. Measurement of the vibrational force depends on the vibration method: if an electromagnetic coil is used to vibrate a magnet secured to the area being tested, then the vibrational force is determined by the coil current. If a reciprocating transducer is used, the vibrational force is determined by a force gauge in the transducer. Using vibrational analysis, a plot of the drive point mobility of the material over the preselected frequency range is generated from the vibrational force and velocity data. Damping loss factor is derived from a plot of the drive point mobility over the preselected frequency range using the resonance dwell method and compared with a reference damping loss factor for structural integrity evaluation.
- Inventors:
- Issue Date:
- Research Org.:
- Savannah River Site (SRS), Aiken, SC (United States)
- Sponsoring Org.:
- USDOE, Washington, DC (United States)
- OSTI Identifier:
- 206402
- Patent Number(s):
- 8194432
- Application Number:
- ON: DE96006454; PAN: 8-194,432
- Assignee:
- Dept. of Energy
- Patent Classifications (CPCs):
-
G - PHYSICS G11 - INFORMATION STORAGE G11C - STATIC STORES
- DOE Contract Number:
- AC09-89SR18035
- Resource Type:
- Patent
- Resource Relation:
- Other Information: PBD: 1994
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 44 INSTRUMENTATION, INCLUDING NUCLEAR AND PARTICLE DETECTORS; 42 ENGINEERING NOT INCLUDED IN OTHER CATEGORIES; BUILDING MATERIALS; DEFECTS; ACOUSTIC TESTING; MECHANICAL VIBRATIONS; DAMPING; NONDESTRUCTIVE TESTING
Citation Formats
Pechersky, M J. Method and apparatus for determining material structural integrity. United States: N. p., 1994.
Web.
Pechersky, M J. Method and apparatus for determining material structural integrity. United States.
Pechersky, M J. Sat .
"Method and apparatus for determining material structural integrity". United States. https://www.osti.gov/servlets/purl/206402.
@article{osti_206402,
title = {Method and apparatus for determining material structural integrity},
author = {Pechersky, M J},
abstractNote = {Disclosed are a nondestructive method and apparatus for determining the structural integrity of materials by combining laser vibrometry with damping analysis to determine the damping loss factor. The method comprises the steps of vibrating the area being tested over a known frequency range and measuring vibrational force and velocity vs time over the known frequency range. Vibrational velocity is preferably measured by a laser vibrometer. Measurement of the vibrational force depends on the vibration method: if an electromagnetic coil is used to vibrate a magnet secured to the area being tested, then the vibrational force is determined by the coil current. If a reciprocating transducer is used, the vibrational force is determined by a force gauge in the transducer. Using vibrational analysis, a plot of the drive point mobility of the material over the preselected frequency range is generated from the vibrational force and velocity data. Damping loss factor is derived from a plot of the drive point mobility over the preselected frequency range using the resonance dwell method and compared with a reference damping loss factor for structural integrity evaluation.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1994},
month = {1}
}