Method of measurement of residual stresses in the material of th

Details Method of measurement of residual stresses in the material of th Method of measurement of residual stresses in the material of th

1988-11-04

1990-05-22

Tokar, Michael J.

Measuring and testing

Vibration

By mechanical waves

G01N 2900

Patent

active

049266926

ABSTRACT:
The invention solves the problem of measurement of internal stresses in cylindrical objects, such as axles, shafts and tubes made of material with varying non-uniform homogeneous mechanical properties. The method consists in that a beam of ultrasonic waves is thrown onto the surface of a cylindrical object being tested, said beam being refracted at an angle of 90 degrees. Next the times of passage for every type of waves are measured. On the basis of the calculated differences of the times of passage with a standard the absolute values of components of stresses are calculated. The method is applicable for non-destructive testing of properties and structure of materials and products.

REFERENCES:
patent: 3720098 (1973-03-01), Dixon
patent: 3812709 (1974-05-01), Benson et al.
patent: 3978712 (1976-09-01), Cowan et al.
patent: 4121467 (1978-10-01), Gerhart
patent: 4462257 (1984-07-01), Gerhart et al.
patent: 4522071 (1985-06-01), Thompson
B. E. Gordon, Jr., "Measurement of Applied and Residual Stresses Using an Ultrasonic Instrumentation System", ISA Transactions, vol. 19, No. 2.
Clark, A. V. Jr., Fukuoka, H., Mitrakovic, D. V., Moulder, J. C., "Characterization of Residual Stress and Texture in Coast Steel Railroad Wheels", Ultrasonic, 1986, vol. 24, pp. 281-288.
Thompson, R. B., Lee, S. S., and Smith, J. F., "Angular Dependence of Ultrasonic Wave Propagation in a Stressed Orthorhombic Continuum", Theory and Application to the Measurement of Stress and Texture, JASA, vol. 80, Sep. 1986, pp. 921-931.

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