Title:
FORECASTING GENERATION OF FATIGUE CRACKS IN METALLIC STRUCTURAL MEMBER
Document Type and Number:
Japanese Patent JPS5589732
Kind Code:
A
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.
Inventors:
DONARUDO HAABEI OEAATORU
MAABIN RABAAN PIITAASON
MAABIN RABAAN PIITAASON
Application Number:
JP12725579A
Publication Date:
July 07, 1980
Filing Date:
October 02, 1979
Export Citation:
Assignee:
CONOCO INC
International Classes:
G01N3/32; G01M5/00; G01M99/00; G01N3/00; (IPC1-7): G01N3/32
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