Accession Number : AD0285496

Title :   EXPLOSION TEAR TEST STUDIES OF HIGH-STRENGTH Q and T STEELS

Descriptive Note : Final rept.

Corporate Author : NAVAL RESEARCH LAB WASHINGTON DC

Personal Author(s) : PUZAK, P P ; BABECKI, A J

PDF Url : AD0285496

Report Date : 06 Sep 1962

Pagination or Media Count : 18

Abstract : Cleavage (brittle) fractures, have been investigated extensively. Proof-test failures involving 'low energy shear' fractures have been encountered under conditions of near-yield-point loading for structures (rocket cases) which utilized high-strength materials. This investigation was undertaken to develop a test method which would provide for the evaluation of tearing characteristics under explosive loadings for steels ranging in yield strength from 100 to 150 ksi. A new test, the explosion tear test, was developed. Preliminary results demonstrate that high-strength materials differ widely in tearing resistance. The relationship of Charpy V shelf level to tearing resistance has been examined. Shelf-level values significantly less than 40 to 50 ft-lb are shown to correlate with low energy shear characteristics in the explosion tear test. The quantitative correlation of Charpy V shelf level to tearing resistance of high- strength steels, however, is disclosed to be more complex than originally presumed. The complications, involving a yield-strength dependency and other factors, are discussed.

Descriptors :   *SHEAR STRESSES, *STEEL, ALLOYS, MECHANICAL PROPERTIES, STAINLESS STEEL, TEST METHODS

Subject Categories : Mechanics

Distribution Statement : APPROVED FOR PUBLIC RELEASE