Method and system for controlling cracks in loaded structures

Details Method and system for controlling cracks in loaded structures Method and system for controlling cracks in loaded structures

1986-12-11

1988-07-12

Levy, Stewart J.

Measuring and testing

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

By loading of specimen

G01N 1908

Patent

active

047561947

ABSTRACT:
Method and system for monitoring cracks liable to appear and/or to grow in one point of a loaded structure. According to the invention, a theoretical increase of the length of the crack is cumulatively calculated, as and when the stresses are exerted, from said initial length, so as to determine an instant theoretical crack length; said instant theoretical length is permanently compared to said maximum acceptable length, and said point is inspected as soon as said instant theoretical length reaches said maximum acceptable length.

REFERENCES:
patent: 3596269 (1971-07-01), Laska
patent: 4107980 (1978-08-01), Crane et al.
patent: 4175447 (1979-11-01), Fukuhara
patent: 4304135 (1981-12-01), Peterson et al.
Deans et al., "A Simple and Sensitive Method of Monitoring Crack and Load in Compact Fracture Mechanics Specimens Using Strain Gages", J. Test. & Eval. (USA), vol. 7, No. 3 (May 1979).
Schijve et al., "A Specimen for a Constant Stress Intensity Factor", Engineering Fracture Mechanics, vol. 9, No. 2, pp. 331-340, 1977.

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