Accession Number : AD0867057

Title :   A Study of Brittle Rupture Conditions in Very High Strength Steels,

Corporate Author : FOREIGN TECHNOLOGY DIV WRIGHT-PATTERSON AFB OH

Personal Author(s) : Mazanec, K. ; Hyspecka, L. ; Pahuta, P.

Report Date : 22 DEC 1969

Pagination or Media Count : 22

Abstract : Some basic problems associated with the measuring of fracture parameters of high-strength steels are discussed. The so-called rupture toughness and possibly the factor of the stress intensity factor are the most important problems. The paper also gives an analysis of the testing method and describes the measuring technique of these parameters using the calibration technique which is based on measuring the loading force necessary for the development of the first fissure. The loading was recorded by means of sonic pulses and by the dependence loading-crack opening at the notch root. The existence of the initial development of the fissure was verified and the sonic records and the records of the loading-crack formation at the notch root were discussed, and two phases of the crack development were observed. Data rendered by the measurement of rupture toughness values in steels are summarized. The fracture toughness values obtained in the case of plane deformation were compared with published data for various steel types or alloys subjected to different methods of nonconventional treatment. The measurement results revealed that the studied steels have satisfactory rupture toughness values. The present paper is part of an over-all investigation into the properties of thermomechanically treated steels. (Author)

Descriptors :   (*STEEL, BRITTLENESS), RUPTURE, FRACTURE(MECHANICS), STRESSES, CZECHOSLOVAKIA.

Subject Categories : Metallurgy and Metallography
      Mechanics

Distribution Statement : APPROVED FOR PUBLIC RELEASE