Accession Number:

AD0770189

Title:

Plastic Deformation of Metals at High Strain Rates. Part I. The Effects of Temperature on the Static and Dynamic Stress-Strain Characteristics in Torsion of 1100-0 Aluminum.

Descriptive Note:

Summary rept. Feb 72-Mar 73,

Corporate Author:

BROWN UNIV PROVIDENCE R I DEPT OF ENGINEERING

Personal Author(s):

• Eleiche,A. M.
• Duffy,J.

Report Date:

1973-07-01

Pagination or Media Count:

76.0

Abstract:

A series of tests is described in which tubular specimens of a commercially pure polycrystalline aluminum were loaded in torsion up to shear strains of about 2 and 4 respectively, over the temperature range -180C to 250C. The experimental results give the flow stress in shear, the strain and the strain rate against time. They also give stress-strain curves which are compared to the corrresponding static curves obtained by testing similar specimens in torsion at about 0.001sec. A graph showing the dependence of flow stress on temperature indicates that there are three different temperature ranges for polycrystalline aluminum within each of which a different deformation mechanism presumably dominates the flow process. Modified author abstract

Descriptors:

• *Stress strain relations
• *Plastic deformation
• *Aluminum
• Strain rate
• Temperature
• Torsion

Subject Categories:

• Metallurgy and Metallography

Distribution Statement:

APPROVED FOR PUBLIC RELEASE