Accession Number : AD0849953

Title :   Ultrasonic Monitoring of Initial Fatigue Crack Propagation,

Corporate Author : FOREIGN TECHNOLOGY DIV WRIGHT-PATTERSON AFB OH

Personal Author(s) : Reti, P.

Report Date : 04 OCT 1968

Pagination or Media Count : 11

Abstract : Defects of up-to-date machinery are most frequently due to material fatigue. The paper contains the author's recent test results, according to which ultrasonic signals, produced by reference to standards, were successfully applied to assessing the degree of fatigue cracking caused by repeated loads. Mathematical relationships were determined between the surface crack referred to by the defect signal, the crack propagation rate, and the increase in the amplitude. (Author)

Descriptors :   (*CRACK PROPAGATION, NONDESTRUCTIVE TESTING), (*MATERIALS, CRACK PROPAGATION), CRACKS, DEFECTS(MATERIALS), CALIBRATION, RAYLEIGH WAVES, USSR, ULTRASONIC RADIATION.

Subject Categories : Metallurgy and Metallography
      Test Facilities, Equipment and Methods

Distribution Statement : APPROVED FOR PUBLIC RELEASE