Accession Number : AD0697646

Title :   COMPARISON OF THE FRENCH DAMAGE LINE TO CYCLIC INDUCED CHANGES IN THE YIELD BEHAVIOR OF LOW CARBON STEEL,

Corporate Author : IOWA UNIV IOWA CITY DEPT OF MECHANICAL ENGINEERING

Personal Author(s) : Assadi,D. V. ; Stephens,R. I.

Report Date : JUN 1969

Pagination or Media Count : 18

Abstract : The upper yield point of low carbon steel can be completely removed by cyclic stressing above the fatigue limit under fully-reversed conditions. This removal is dependent upon both the magnitude of the cyclic stress and the number of applied cycles. The locus of points, superimposed on an S-1ogN diagram, representing this yield point removal, appears similar to the French damage line. The objective of this research was to investigate this similarity. The results verify the macroscopic similarity, but suggested mechanisms which control the phenomena are quite different. The French damage line is dependent primarily upon localized microcrack initiation and propagation, and the cyclic yield point behavior is dependent upon gross cumulative multiplication of mobile dislocations. (Author)

Descriptors :   (*STEEL, MECHANICAL PROPERTIES), STRESSES, YIELD POINT, TENSILE PROPERTIES, REDUCTION OF AREA, FATIGUE(MECHANICS), CRACKS, CRACK PROPAGATION, TEST METHODS

Subject Categories : Metallurgy and Metallography
      Mechanics

Distribution Statement : APPROVED FOR PUBLIC RELEASE