Measuring and testing – Specimen stress or strain – or testing by stress or strain... – Deformation or change in stress after fracture – cutting – or...
Patent
1979-05-11
1981-02-10
Myracle, Jerry W.
Measuring and testing
Specimen stress or strain, or testing by stress or strain...
Deformation or change in stress after fracture, cutting, or...
G01N 1906
Patent
active
042494230
ABSTRACT:
Residual stress measurements are made using a strain gage and stress relief achieved by local melting of a region of the object being tested by a laser beam or other finely directed heat source. Surface strain is measured dynamically before the heat of the molten region diffuses under the gage and results in thermal stress. The method is semi-nondestructive because the molten region recasts with little loss of material, is rapid, and can be utilized on difficult geometries such as the interior surface of reactor pipe.
REFERENCES:
patent: 3696504 (1972-10-01), Cupler
patent: 3765230 (1973-10-01), Bohm et al.
Bush, A. J., et al., "Simplification of . . . Stress Measurement," ISA Transactions, vol. 12, No. 3, 1973, pp. 249-259.
Jones Marshall G.
Viertl John R. M.
Campbell Donald R.
Davis James C.
General Electric Company
Myracle Jerry W.
Snyder Marvin
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