Measuring and testing – Vibration – By mechanical waves
Patent
1994-09-28
1996-09-17
Chilcot, Richard
Measuring and testing
Vibration
By mechanical waves
73794, G01N 2918
Patent
active
055570488
ABSTRACT:
A stress evaluation method for evaluating stress acting on a test piece includes the steps of transmitting acoustic waves including a surface wave, a longitudinal wave, and a shear wave through the test piece; receiving the acoustic waves after they have propagated through the test piece; obtaining acoustic velocities of the surface wave at a non-loaded portion and a loaded portion of the test piece based on the received acoustic waves; evaluating a stress in a surface layer of the test piece based on a difference between the surface wave acoustic velocities at the non-loaded portion and the loaded portion and a predetermined relationship between surface wave acoustic velocities and stresses; obtaining an acoustic velocity of the longitudinal wave at the non-loaded portion based on the received acoustic waves; calculating an acoustic velocity of the shear wave at the loaded portion based on the received acoustic waves and the longitudinal wave acoustic velocity at the non-loaded portion; evaluating an internal average stress in the test piece based on the shear wave acoustic velocity at the loaded portion; evaluating an internal stress distribution in the test piece by correcting a hypothetical internal stress distribution in the test piece based on the stress in the surface layer and the internal average stress; and conducting a diagnosis of the test piece based on the internal stress distribution.
REFERENCES:
patent: 3986391 (1976-10-01), Vahaviolos
patent: 4033182 (1977-07-01), Clotfelter
patent: 4056970 (1977-11-01), Sollish
patent: 4080836 (1978-03-01), Thompson et al.
patent: 4121467 (1978-10-01), Gerhart
patent: 4210028 (1980-07-01), Hildebrand
patent: 4364114 (1982-12-01), Renzel et al.
patent: 4399702 (1983-08-01), Suzuki
patent: 4413517 (1983-11-01), Soden
patent: 4569229 (1985-02-01), de Halleux
patent: 4995260 (1991-02-01), Deason et al.
patent: 5125273 (1992-06-01), Negita
patent: 5154081 (1992-10-01), Thompson et al.
patent: 5307680 (1994-05-01), Drescher-Krasicka
patent: 5341683 (1994-08-01), Searle
Inoue Hideki
Kamimoto Shuuji
Koike Masahiro
Musha Yosinori
Naito Shinji
Chilcot Richard
Hitachi , Ltd.
McCall Eric S.
LandOfFree
Stress evaluation method and apparatus therefor does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Stress evaluation method and apparatus therefor, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Stress evaluation method and apparatus therefor will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-414660