Method of measuring stress in a material

Details Method of measuring stress in a material Method of measuring stress in a material

1977-03-07

1978-03-28

Ruehl, Charles A.

Measuring and testing

Vibration

By mechanical waves

73643, 73 88R, G01N 2900, G01B 716

Patent

active

040808360

ABSTRACT:
Stress in a material is measured using electromagnetically generated, transverse elastic waves. A correlation is known to exist between the difference in velocity of orthogonally polarized transverse waves in the type material being measured and stress in the material. An electromagnetic transducer is used to generate orthogonally polarized waves traveling through the part at different velocities as a result of anisotropic stress in the part. The difference in velocity between the polarized waves is measured and compared to the correlation to obtain the stress existing in the part.

REFERENCES:
patent: 3460063 (1969-08-01), Houck et al.
patent: 3550435 (1970-12-01), Kaule
patent: 3587297 (1971-06-01), Kammer
patent: 3786672 (1974-01-01), Gaerttner
patent: 3812709 (1974-05-01), Benson et al.
R. T. Smith -- "Stress Induced Anisotropy in Solids/The Acousto-Elastic Effect" -- Ultrasonics - July-Sept., 1963, pp. 139-144.

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