Accession Number:

AD0434098

Title:

THE EFFECT OF STRESS ON THE LUDERS BAND VELOCITY IN NIOBIUM,

Descriptive Note:

Corporate Author:

AEROSPACE CORP EL SEGUNDO CALIF

Personal Author(s):

Report Date:

1963-11-12

Pagination or Media Count:

19.0

Abstract:

A study was made of the effect of stress on the Luders band velocity at room temperature in niobium of two impurity levels. The results indicate that the velocity is uniquely dependent on the effective stress, being independent of specimen length, crosshead velocity, the number of fronts, and the long-range internal stress fields associated with the structure. The activation volume as a function of stress derived from the present tests is independent of impurity content and is in good accord with that derived previously for yielding and flow in niobium and thus supports that the thermally activated overcoming of the Peierls-Nabarro stress is the rate controlling mechanism. Author

Subject Categories:

Distribution Statement:

APPROVED FOR PUBLIC RELEASE