Accession Number:

AD0726998

Title:

The Development and Use of a Torsional Split Hopkinson Bar for Experiments in Dynamic Plasticity.

Descriptive Note:

Summary technical rept. Sep 69-Dec 70,

Corporate Author:

AIR FORCE MATERIALS LAB WRIGHT-PATTERSON AFB OHIO

Personal Author(s):

Report Date:

1971-05-01

Pagination or Media Count:

39.0

Abstract:

The development and use of a torsional split-Hopkinson bar testing apparatus for determining the mechanical properties of materials at high rates of strain is described. The apparatus is capable of generating a smooth torsional pulse with a rise-time of approximately 20 microseconds and can be used to generate shear stress-strain data at strain rates above 1000sec. Experimental data are presented for an aluminum alloy. Results of incremental wave propagation tests on quasistatically prestressed specimens of an essentially rate-independent metal indicate that the velocity of propagation of the wave front is that of an elastic shear wave which is in agreement with the rate-dependent theory of plastic wave propagation. Author

Subject Categories:

  • Test Facilities, Equipment and Methods

Distribution Statement:

APPROVED FOR PUBLIC RELEASE