Accession Number:

ADA194223

Title:

Plastic Flow and Failure Modeling under High Strain Rate Loading

Descriptive Note:

Final rept. Aug 1984-Apr 1987

Corporate Author:

DAYTON UNIV OH RESEARCH INST

Personal Author(s):

Report Date:

1988-02-01

Pagination or Media Count:

133.0

Abstract:

High strain rate properties were determined for several metals at room and high temperatures. Split Hopkinson bar SHB tests under both tension and compression were performed for obtaining stress-strain curves at different strain rates. Quasistatic tests were also conducted and were compared with the SHB test results. High speed photographs of the necking process in tensile SHB samples were taken and the stress-strain curves beyond necking for 1020 and HY 100 steels, and 6061-T6 aluminum were determined. Technique to heat SHB tensile samples using an induction coil technique was successfully developed. An experimental configuration in which a flyer plate impacts a long rod was used to determine the initial yield stress for three steels. Manganin gage stress measurement technique was used in this experiment. Plate impact tests were also conducted to determine precursor decay, steady state value for HEL, and spall strength. It was also demonstrated that the use of the manganin gage can be extended to determine transverse stresses in a plate impact test. A methodology to determine shock velocity at very high pressures using manganin gages is also presented. Under the analytical modeling efforts, data from the various experimental configurations were used to calibrate the Bodner-Partom viscoplastic constitutive model parameters.

Subject Categories:

  • Properties of Metals and Alloys

Distribution Statement:

APPROVED FOR PUBLIC RELEASE