Measuring and testing – Vibration – By mechanical waves
Patent
1991-09-16
1994-04-26
Williams, Hezron E.
Measuring and testing
Vibration
By mechanical waves
73627, 73645, G01N 2918
Patent
active
053056418
ABSTRACT:
Increasing use of thermo-mechanically treated high strength steels in construction projects has created a need for on-site inspection of welded joints by ultrasonic techniques. However, such steels are acoustically anisotropic, and corrections of test results for anisotropy, according to the traditional methodologies, require lengthy and complex preparation steps which are unsuitable for on-site testing. The present invention presents an automated quick and simple methodology, and a compact apparatus for determining the acoustic anisotropy in such materials. The apparatus is expected to lead to effective management of quality assurance not only in civil and architectural engineering projects but in heavy machinery and ship building industries.
REFERENCES:
patent: 4033182 (1977-07-01), Clotfelter
patent: 4138894 (1979-02-01), Robert et al.
patent: 5176033 (1993-01-01), Jones et al.
Japanese Industrial Standard JIS Z 3060-1988, entitled Methods of Manual Ultrasonic Examination and Classification of Test Results for Ferritic Steel Welds, Sec. 5.10 p. 19 to Sec. 5.10.6 "Certification of Acoustic Anistropy" on p. 21.
Document published by the Architectural Institute of Japan (AIJ) 1989, as a supplement of JIS Z 3060-1988. "Standard For The Ultrasonic Inspection Of Weld Defects In Steel Structures", pp. 109-113, 114-124, Lines 18-21.
"Ultrasonic Measurement of Sheet Anisotropy and Formability" by A. V. Clark et al., SAE Technical Paper Series, Feb. 27-Mar. 3, 1989 (pp. 89-95).
"Ultrasonic Measurement of Formability in Thin Ferritic Steel Sheet" by A. V. Clark et al., 1988 Review of Progress NPE, La Jolla, Calif. Aug. 1988 (pp. 1-8).
"Stress-Induced Anistrophy in Solids--The Acousto-Elastic Effect" by R. J. Smith, Ultrasonics/Jul.-Sep. /1963 pp. 135-147.
Kuramochi Mitsugu
Yabe Yoshitaka
Finley Rose M.
Shimizu Construction Co. Ltd.
Williams Hezron E.
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