Accession Number : ADA329898

Title :   Methods of Early Fatigue Detection.

Descriptive Note : Technical rept.,

Corporate Author : AERONAUTICAL AND MARITIME RESEARCH LAB MELBOURNE (AUSTRALIA)

Personal Author(s) : Rajic, N. ; Tsoi, K.

PDF Url : ADA329898

Report Date : OCT 1996

Pagination or Media Count : 31

Abstract : This note presents a brief review of techniques which may be applied to the detection of the early manifestations of fatigue damage in metals and also introduces two new methods which at the time of the preparation of this note were the subject of feasibility investigations at AMRL. In the first of these new methods, the fatigue state of a structure is inferred from variations in the electrical resistance of a metal foil bonded to the structure and subjected to the same loading history. The second method involves the infusion of radioactive hydrogen (tritium) into a structure that may contain fatigue damage. Damaged parts of the structure act as preferred trapping sites for the tritium, and these may be detected by the emission of beta radiation from the decay of the trapped tritium.

Descriptors :   *FATIGUE(MECHANICS), EMISSION, METALS, DETECTION, DAMAGE, HYDROGEN, FEASIBILITY STUDIES, HISTORY, RADIOACTIVITY, ELECTRICAL RESISTANCE, TRITIUM, INFUSIONS.

Subject Categories : Test Facilities, Equipment and Methods
      Mechanics

Distribution Statement : APPROVED FOR PUBLIC RELEASE