Structural failure detection method

Details Structural failure detection method Structural failure detection method

1978-10-02

1979-12-25

Myracle, Jerry W.

Measuring and testing

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

By loading of specimen

73799, G01N 332

Patent

active

041799402

ABSTRACT:
Crack initiation in metallic structural members subject to cyclic loading is predicted by sensing metallurgical changes taking place as a result of the cyclic loading. Fatigue loading produces a cycle comprising a condition described as fatigue relaxation followed by fatigue intensification. By monitoring this cycle, measured strain for a known applied load will increase or decrease. By monitoring the change in strain load, crack initiation can be predicted as fatigue relaxation becomes fatigue intensification. In a preferred embodiment, the strain gauge is mounted beneath a patch excluding ambient atmosphere during monitoring of the structural members.

REFERENCES:
patent: 2948872 (1960-08-01), Beckman
patent: 3343406 (1967-09-01), Branger

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