Crack sizing

Details Crack sizing Crack sizing

1987-09-11

1989-05-02

Yasich, Daniel M.

Thermal measuring and testing

Leak or flaw detection

With heating or cooling of specimen for test

374 7, G01N 2572

Patent

active

048263265

ABSTRACT:
A method of assessing the depth to which a crack extends below the surface of an object, or the thickness of a ligament (12) covering a crack (14), in which a thermal imager )26) is used to obtain a surface temperature profile along a line extending across the crack or ligament as heat is flowing across the surface and through the ligament. There is a steep drop in temperature across the crack or ligament, and the size of this drop at a predetermined time after the start of the heat flow may be simply related to the crack depth or ligament thickness.

REFERENCES:
patent: Re32166 (1986-06-01), Berge
patent: 3635085 (1972-01-01), Shimotsuma et al.
patent: 3718757 (1973-02-01), Gulitz et al.
patent: 4579463 (1986-04-01), Rosencwaig et al.
patent: 4647220 (1987-03-01), Adams et al.
patent: 4671674 (1987-06-01), Detronde
"Non-Destructive Examination of Fibre Composite Structure by Thermal Field Techniques", P. V. McLaughlin et al., NDT International, Apr. 1980, pp. 56-62.
"IR Non-Destructive Testing of Bonded Structures: Aspects of Theory and Practice", V. Vavilov, NDT '79 Conference, Nottingham (9/1979), [175-183, (Bulletin 7/1980)].
"Thermal and Infrared Nondestructive Testing of Composites and Ceramics", by D. R. Green, Materials Evaluation, vol. 29, No. 11, 11/1971, pp. 241-247.

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