Accession Number : AD0696933

Title :   GRAPHICAL METHODS FOR PLASTICITY CORRECTIONS IN FRACTURE MECHANICS,

Corporate Author : NAVAL RESEARCH LAB WASHINGTON D C

Personal Author(s) : Kies,J. A. ; Smith,H. L. ; Stonesifer,F. R.

Report Date : 18 SEP 1969

Pagination or Media Count : 23

Abstract : Fracture mechanics is an analytical procedure that relates the critical stress, critical crack dimensions, and toughness of a given material so that standards of inspection and tolerable defects may be set. Failure analysis is a relatively simple and useful application of fracture mechanics. The subject of failure prevention and reliability assurance is at least equally important, but it is complicated by present limitations on the ability of nondestructive tests to measure, with sufficient accuracy, individual small defects in specimens or in structures. The application of fracture mechanics to the study of stress corrosion cracking has led to results that are drastically changing our ideas of what is and what is not susceptible to this kind of failure. For very tough materials, i.e., those in which the plastic zone size developed at the border of a crack becomes comparable with the crack dimensions, the applicability of fracture mechanics formulas becomes uncertain. In this case, a more empirical type of evaluation based on the total work for plastic flowing may be more useful. A graphical method is proposed for making plasticity corrections so that the linear elastic equations may be applied. (Author)

Descriptors :   (*FRACTURE(MECHANICS), CORRECTIONS), PLASTIC PROPERTIES, GRAPHICS, TOUGHNESS, CRACKS

Subject Categories : Mechanics

Distribution Statement : APPROVED FOR PUBLIC RELEASE