Accession Number : AD0752446

Title :   Some Critical Studies of Macroscopic and Microscopic Fracture Criteria for Steel.

Descriptive Note : Technical rept.,

Corporate Author : CALIFORNIA UNIV LOS ANGELES SCHOOL OF ENGINEERING AND APPLIED SCIENCE

Personal Author(s) : Tetelman,A. S. ; Robinson,J. N. ; Mohamed,S. A. ; Ensha,S.

Report Date : SEP 1972

Pagination or Media Count : 43

Abstract : Research shows how plane strain values of the crack tip opening displacement, COD, can be determined on pre-cracked Charpy specimens loaded well beyond general yield. The measurements are then used to determine K sub Ic values that agree with 'valid' measurements on twelve inch thick specimens of A533 steel. The results of an experimental and analytic visioplasticity investigation is described which allows a determination to be made of the critical local strain required to initiate fracture at the tip of a sharp notch. The report also presents the results and analysis of a study to determine quantitative relations between K sub Ic (and K sub Id) and microscopic variables such as grain size for cleavage fracture that occurs at low temperatures. (Author)

Descriptors :   (*STEEL, FRACTURE(MECHANICS)), CRACK PROPAGATION, DUCTILITY, STRAIN(MECHANICS), PLASTIC PROPERTIES, RUPTURE

Subject Categories : Metallurgy and Metallography

Distribution Statement : APPROVED FOR PUBLIC RELEASE