Accession Number : AD0774487

Title :   Some Fracture Mechanics Relationships for Thin Sheet Materials.

Descriptive Note : Final rept.,

Corporate Author : NAVAL RESEARCH LAB WASHINGTON D C

Personal Author(s) : Sullivan,A. M. ; Stoop,J.

Report Date : 21 DEC 1973

Pagination or Media Count : 26

Abstract : The fracture resistance parameter Kc has been determined for a number of aluminum, titanium, and steel alloy sheet materials over a thickness range of 0.032 to 0.25 in. (0.8 to 6.25 mm). The Kc parameter is found to depend inversely upon the material yield stress. Further, a relationship can be established between Kc and fracture appearance. Analysis of the data has also disclosed that the amount of crack extension, i.e., final crack length appears to be influenced by the initial crack length. A straight-line curve in logarithmic coordinates relates the ratio of initial to final crack length. The development of these relationships can be of real assistance in the design of a standard initial screening test for Kc. (Modified author abstract)

Descriptors :   *Fracture(Mechanics), *Aluminum alloys, *Titanium alloys, *Steel, *Sheets, Thinness, Crack propagation, Yield strength, Numerical analysis

Subject Categories : Metallurgy and Metallography

Distribution Statement : APPROVED FOR PUBLIC RELEASE