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Title: Crack detection using resonant ultrasound spectroscopy

Method and apparatus are provided for detecting crack-like flaws in components. A plurality of exciting frequencies are generated and applied to a component in a dry condition to obtain a first ultrasonic spectrum of the component. The component is then wet with a selected liquid to penetrate any crack-like flaws in the component. The plurality of exciting frequencies are again applied to the component and a second ultrasonic spectrum of the component is obtained. The wet and dry ultrasonic spectra are then analyzed to determine the second harmonic components in each of the ultrasonic resonance spectra and the second harmonic components are compared to ascertain the presence of crack-like flaws in the component. 5 figs.
Inventors:
; ;
Issue Date:
OSTI Identifier:
7174895
Assignee:
Univ. of California, Office of Technology Transfer, Alameda, CA (United States) PTO; EDB-94-168661
Patent Number(s):
US 5351543; A
Application Number:
PPN: US 7-813651
Contract Number:
W-7405-ENG-36
Resource Relation:
Patent File Date: 27 Dec 1991
Country of Publication:
United States
Language:
English
Subject:
42 ENGINEERING; CRACKS; DETECTION; ULTRASONIC TESTING; COMPARATIVE EVALUATIONS; SPECTROSCOPY; ACOUSTIC TESTING; EVALUATION; MATERIALS TESTING; NONDESTRUCTIVE TESTING; TESTING; 420500* - Engineering- Materials Testing