Accession Number:

AD0730613

Title:

Material Instabilities in the Experimental Study of the Plastic Compressibility of Some Important Metals

Descriptive Note:

Interim Scientific

Corporate Author:

IOWA UNIV IOWA CITY DEPT OF MECHANICS AND HYDRAULICS

Personal Author(s):

Report Date:

1971-08-01

Pagination or Media Count:

53.0

Abstract:

The hypothesis of plastic incompressibility, which is pivotal in the development of the classical theory of plasticity was tested by means of a series of simple tension tests on aluminum, copper and low carbon steel. The experimental measurements show conclusively that these metals are plastically compressible, the compressibility increasing with straining in the plastic region. A new phenomenon, termed lateral instability, was also observed, consisting in an abrupt plastic flow in the transverse direction either immediately preceding or immediately following yield in the longitudinal direction, during a simple tension test on low carbon steel. To a less pronounced extent such a phenomenon was also observed in the case of commercially pure aluminum.

Subject Categories:

  • Metallurgy and Metallography

Distribution Statement:

APPROVED FOR PUBLIC RELEASE