Measurement of residual stresses by local melting

Details Measurement of residual stresses by local melting Measurement of residual stresses by local melting

1979-05-10

1981-02-03

Gill, James J.

Measuring and testing

Specimen stress or strain, or testing by stress or strain...

73783, G01N 3300

Patent

active

042480949

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 focused heat source. Surface strain is measured after the molten region resolidifies, and the effect of thermal stress and recast stress is eliminated by subtracting a calibration measurement of an annealed specimen. The method is semi-nondestructive, less costly than existing techniques, and can be used to measure residual stress on the interior surface of pipes.

REFERENCES:
patent: 3696504 (1972-10-01), Cupler et al.
patent: 3765230 (1973-10-01), Bohm et al.
"Simplification of the Hole-Drilling Method of Residual Stress Measurement" by Bush et al., ISA Transactions, vol. 12, No. 3, pp. 249-258, 1973.

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