Plastic Flow and Failure Modeling under High Strain Rate Loading
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.
Document Details
- Document Type
- Technical Report
- Publication Date
- Feb 01, 1988
- Accession Number
- ADA194223
Entities
People
- A. M. Rajendran
- Stephan Bless
Organizations
- University of Dayton