Accession Number : AD0695067

Title :   HIGH AND LOW STRESS LEVEL FATIGUE FRACTURES IN MILD STEEL.

Descriptive Note : Summary rept.,

Corporate Author : SOUTHAMPTON UNIV (ENGLAND) INST OF SOUND AND VIBRATION RESEARCH

Personal Author(s) : Bily,Matej ; Williams,Thomas R. G.

Report Date : AUG 1969

Pagination or Media Count : 22

Abstract : Fatigue fractures of mild steel under sinusoidal and random loading conditions have been investigated. The fractures can be divided into two groups; at low stresses the fatigue crack paths are transcrystalline and at high stresses they are both transcrystalline and intercrystalline. The transition occurs over a narrow stress range and is associated with a discontinuity in the S/N curve. This discontinuity involves the onset of yielding at the root of the notched specimens and the yield point in cyclic loading correlates with yielding in monotonic straining. (Author)

Descriptors :   (*STEEL, FRACTURE(MECHANICS)), STRESSES, NOTCH TOUGHNESS, CRACKS, CRACK PROPAGATION, YIELD POINT, INTERACTIONS, STRAIN HARDENING, FATIGUE(MECHANICS)

Subject Categories : Metallurgy and Metallography
      Solid State Physics

Distribution Statement : APPROVED FOR PUBLIC RELEASE